APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Tao Huanga,Lifeng Guan,Shuai Jin,Dehui Zhang,Wangwen Liao,Xiangyang Zhou,Xingxing Liu,Chen Wu,Wei Zeng
The low electrical conductivity of Li 3 V 2 (PO 4 ) 3 (LVP) impedes its practical application. To address this issue, this study enhances its conductivity by introducing nitrogen-doped carbon nanoframes into LVP. Using phytic acid as a carbon and phosphorus source, and polyvinylpyrrolidone (PVP) as a nitrogen source, nitrogen-doped nanoframe-modified LVP material (LVP@NC) was successfully synthesized. Importantly, the carbon nanoframes of LVP@NC are entirely derived from the precursor’s thermal decomposition, simplifying the synthesis process and reducing production costs. By optimizing the process parameters, significant improvements were achieved in key performance indicators, including the initial discharge capacity at 1C (132.85 mAh·g −1 ), long cycling life at 10C (98.98 % capacity retention after 1000 cycles), and rate capability at 50C (99.65 mAh·g −1 ). These improvements are attributed to the introduction of nitrogen-doped nanoframes, where the high-temperature decomposition of PVP leads to the formation of porous honeycomb-like structures, and nitrogen doping in the nanocarbon framework introduces defects and active sites, thereby promoting lithium-ion migration and facilitating electrolyte penetration. This simple, novel, and energy-efficient method demonstrates significant potential for the large-scale preparation of high-performance cathode materials.
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高影响因子
Nano Energy
·
2021
·
IF 17.881
Guijia Cui,Qingyu Dong,Zhuangzhou Wang,Xiao-Zhen Liao,Siqi Yuan,Meidan Jiang,Yanbin Shen,Hong Wang,Haiying Che,Yu-Shi He,Zi-Feng Ma
NASICON-type (Na super ionic conductor) Na 4 VMn(PO 4 ) 3 (NVMP) cathode material has attracted increasing attention due to its higher sodium de-/intercalation voltage, lower cost and greener resources compared with Na 3 V 2 (PO 4 ) 3 . However, the poor electronic conductivity limits the exploitation of its electrochemical performance. In this work, we achieved an ultrahigh rate capable and long cycle life NVMP/C-rGO composite using the simple and scalable spray-drying technique, in which low-fraction rGO nanosheets (2.14 wt%) highly dispersed and bridged the carbon shelled NVMP nanoparticles to form an effective electron conductive network. Benefiting from this favorable nano-architecture, the elaborately designed NVMP/C-rGO composite exhibited excellent performance as cathode in sodium ion batteries, delivering reversible capacities of 105.5 mA h g −1 at 1 C (1 C = 110 mA h g −1 ) and 102.6 mA h g −1 at 50 C with capacity retention of 90.6% (1 C) and 80.4% (50 C) over 500 cycles, respectively. This is the highest rate performance for Na 4 VMn(PO 4 ) 3 materials reported so far. This work provides a practicable tactic for fabricating advanced polyanion-type cathode materials which can be commercially scale up for sodium energy storage.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 46
·23357-23365
·
IF 9.931
Anyu Su,Qiang Pang,Xin Chen,Jiajun Dong,Yingying Zhao,Ruqian Lian,Dong Zhang,Bingbing Liu,Gang Chen,Yingjin Wei
Li3V2(PO4)3 (LVP) has been highlighted as a promising cathode material for lithium ion batteries, but it suffers from poor rate capability and rapid capacity decay due to sluggish electrode kinetics and vigorous electrode/electrolyte side reactions at high voltage. In this study, an inexpensive aqueous lithium poly-acrylic acid (LiPAA) binder was developed to deftly solve the shortcomings of the LVP material by tailoring the functional groups in the binder. The good adhesion and cohesion properties of the LiPAA binder ensured a close linkage between the active LVP particles, conductive additives and current collector, which formed a stable and conductive network in the electrode. In addition, the reversible H+/Li+ exchange in LiPAA effectively assisted the transport of Li+ ions at the electrode interface, which allowed the establishment of a Li+ conductive pathway without considerable degradation of the electrolyte. Due to these advantages, the LVP electrode containing the LiPAA binder exhibited significantly improved electrochemical performance compared to the electrode that employed the traditional polyvinylidene fluoride binder. The new electrode configuration showed a large specific capacity of 107 mA h g−1 at 70C rate and a high capacity retention of 91% was obtained after 1400 cycles at 10C rate, showcasing the great potential of this aqueous binder in lithium ion batteries.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 14
·19901-19911
·
IF 2.478
Wang Fei,Liu Xiaoyu,Liu Zhuang,Wang Yanming
The large-scale application of Li-ion batteries requires high-performance cathode materials. Herein, a high-activity Li 3 V 2 (PO 4 ) 3 /C composite cathode has been fabricated through a solid-state reaction employing dual carbon sources of poly(acrylic acid) and soluble starch. The effects of single carbon source and dual carbon sources on the physical and electrochemical properties of Li 3 V 2 (PO 4 ) 3 /C are analyzed. The porous structure induced by poly(acrylic acid) and highly conductive carbon resulted from soluble starch enable the composite to achieve large discharge capacities and stable cyclability at high C-rates. At 3.0–4.3 V and 10 C, a large discharge capacity of 121 mAh g −1 (nearly 91% of the theoretical capacity) can be obtained, along with high capacity retention of 88% over 1000 cycles. Furthermore, at 3.0–4.8 V, the composite also possesses larger high-rate capacities and better cyclability than other composites prepared using single carbon source. The dual carbon sources bring a synergistic effect to the enhancement of electrochemical performances of the Li 3 V 2 (PO 4 ) 3 /C composite.
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yazhou Chen,Chen Li,Dezhan Ye,Yunfeng Zhang,Haifeng Bao,Hansong Cheng
Polymer electrolytes with single ion conducting behavior, high ion conductivity and fire-resistant play a vital role in suppressing lithium dendrite growth for high security, stability and high energy density of rechargeable lithium metal batteries (LMBs). Herein, we develop a gel single-ion composite electrolyte (SICE) by incorporating Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 nanoparticles into alternating diblock lithiated bis(benzene sulfonyl)imide polyanion with repeating ether groups. Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 nanoparticles can significantly endow SICE membrane more Li + transportation channels, which offers elevated ionic conductivity (8.3 × 10 −4 S cm −1 ) and Li + transference number (0.93) to promote homogenously Li + deposition in lithium foil for dendrite suppression. As a result, a highly reversible Li plating/stripping in a Li symmetric cell enables to run stably for at least 1600 h at 0.5 mA cm −2 . Furthermore, Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 nanoparticles increases the electrochemical window of SICE up to 4.6 V (vs. Li + /Li), meanwhile enhances the thermal stability and fire-resistance, and promotes fast electrolyte wetting. Accordingly, a single-ion conducting LiFePO 4 /Li cell assembled with optimized SICE membrane endowed a high capacity retention of 92.9% after 800 cycles at 1 C, superior to the commercial LiPF 6 /PP system. This work paves a scalable and deployable way for design of advanced single-ion conducting electrolyte membranes to develop secure and stable LMBs.
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Materials
·
2025
·Vol. 18
·期 9
·1969
·
IF 3.2
Ruixia Chu,Hongtao Zhang,Wanyou Huang,Fangyuan Qiu,Yan Wang,Zhenyu Li,Xiaoyue Jin
Lithium-ion batteries (LIBs) with high power, high capacity, and support for fast charging are increasingly favored by consumers. As a commercial electrode material for power batteries, LiFePO4was limited from further wide application due to its low conductivity and lithium-ion diffusion rate. The development of advanced architectures integrating rational conductive networks with optimized ion transport pathways represents a critical frontier in optimizing the performance of cathode materials. In this paper, a novel self-supporting cathode material (designated as LFP@LVP-CES) was synthesized through an integrated coaxial electrospinning and controlled pyrolysis strategy. This methodology directly converts LiFePO4, Li3V2(PO4)3, and polyacrylonitrile (PAN)) into flexible, binder-free cathodes with a hierarchical structural organization. The 3D carbon nanofiber (CNF) matrix synergistically integrates LiFePO4(Li/Fe/POx) and Li3V2(PO4)3(Li/V/POx) nanoparticles, where CNFs act as a conductive scaffold to enhance electron transport, while the POxpolyanionic frameworks stabilize Li+diffusion pathways. Morphological characterizations (SEM and TEM) revealed a 3D cross-connected carbon nanofiber matrix (diameter: 250 ± 50 nm) uniformly embedded with active material particles. Electrochemical evaluations demonstrated that the LFP@LVP-CES cathode delivers an initial specific capacity of 165 mAh·g−1at 0.1 C, maintaining 80 mAh·g−1at 5 C. Notably, the material exhibited exceptional rate capability and cycling stability, demonstrating a 96% capacity recovery after high-rate cycling upon returning to 0.1 C, along with 97% capacity retention over 200 cycles at 1 C. Detailed kinetic analysis through EIS revealed significantly reduced Rctand increased Li+diffusion. This superior electrochemical performance can be attributed to the synergistic effects between the 3D conductive network architecture and dual active materials. Compared with traditional coating processes and high-temperature calcination, the preparation of controllable electrospinning and low-temperature pyrolysis to some extent avoid the introduction of harmful substances and reduce raw material consumption and carbon emissions. This original integration strategy establishes a paradigm for designing freestanding electrode architectures through 3D structural design combined with a bimodal active material, providing critical insights for next-generation energy storage systems.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jing Zeng,Dongzheng Wu,Xin Wang,Junnan Wu,Jiyang Li,Jing Wang,Jinbao Zhao
The high-voltage cathode material based on the sodium super ionic conductor (NASICON) structured Na 3 V 2 (PO 4 ) 3 (NVP) has been found to be a potential candidate for Mg storage. In this work, to improve its electrochemical performance, we construct honeycomb-like structured NVP/C/G with faster electronic and ionic transport by a convenient and universal spray-drying method for the first time. After electrochemically desodiating two Na from the NVP/C/G (ED-NVP/C/G), the ED-NVP/C/G is tested in highly anhydrous Mg electrolyte, and the insights into its Mg storage property and mechanism are carefully studied. An initial capacity of 87 mAh g −1 with a relatively high average discharge voltage of 2.47 V vs. Mg 2+ /Mg is obtained at 0.1 C. The X-ray diffraction (XRD) results show that the inserted Mg 2+ ions tend to occupy the Na2 (at 18e sites) vacant sites. The investigation of kinetic process by galvanostatic intermittent titration technique (GITT) reveals that the Mg diffusion kinetics is faster during the demagnesiation process. The electrochemical reaction bases on two-phase transition mechanism, and the R ct value shows a positive relationship to the formation of NaV 2 (PO 4 ) 3 phase. Finally, a Mg full cell prototype based on the ED-NVP/C/G cathode with Mg metal anode is built. The rational structure design of NVP/C/G improves the electrochemical performance for Mg storage, and our work also gives new understanding into the Mg storage mechanism in the ED-NVP/C/G structure.
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Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 3
·994-1002
·
IF 7.393
Shihai Miao,Yanjie Liang,Yan Zhang,Dongxun Chen,Shao Yan,Jingwei Liu,Xiao-Jun Wang
Near-infrared (NIR) phosphor-converted light-emitting diodes (LEDs) are becoming an efficient and promising solution for high-power NIR light sources, which have shown a broad range of possible applications in the fields of agriculture, food analysis and biomedical diagnostics. However, there is a long-standing challenge to develop tunable and thermally stable NIR-emitting phosphors as luminescence converters in the design of low-cost, compact and high-efficiency NIR LEDs. Here, we report a tunable broadband NIR photoluminescence in Na3Sc2(PO4)3:Cr3+ phosphors via Ga3+ co-doping and explore their application in NIR LEDs. With the fine-tuning of the doping concentration of Ga3+ ions from 0 to 6%, the NIR luminescence of the obtained phosphor can be tuned from sharp line emission at 694 nm (2E → 4A2 transition of Cr3+) to broadband emission centered at 750 nm (4T2 → 4A2 transition of Cr3+) upon blue light excitation. In the meanwhile, the NIR emission intensity at 100 °C and 150 °C can retain ∼100% and ∼84% of the initial value at room temperature when the Ga3+ content is determined to be 6%, leading to thermally stable broadband NIR emission in the as-synthesized Na3Sc2(PO4)3:Cr3+,Ga3+ phosphors. The NIR LEDs constructed by combining the commercial blue LED chips with the optimized NIR phosphors can generate broadband emission in the wavelength range of 600–1000 nm and deliver ∼4 mW of NIR output power with a power conversion efficiency of 2.6% at a drive current of 60 mA. The potential of the fabricated NIR LEDs as a lighting source for night vision and vein imaging is also demonstrated. The outcomes here highlight promising potential for Na3Sc2(PO4)3:Cr3+,Ga3+ as phosphor-downconverted light emitters in the design of high-power NIR LED devices for practical applications.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·Vol. 27
·期 45
·24273-24283
·
IF 2.9
Jin Zou,Daoyun Zhu,Zhongfei Mu,Song Xu,Nurahmat Wali,Fugen Wu,Huafeng Dong,Xin Zhang,Xiao Wu,Yifei Luo,Yuchun Zhan
Near-infrared (NIR) spectroscopic technology has shown extensive application prospects. However, developing NIR phosphors with tunability and high thermal stability is a huge challenge. In this work, a highly promising phosphate compound, K3Ga2(PO4)3, has been successfully synthesized. When doped with Cr3+ ions, it is particularly noteworthy that Cr3+ exhibits highly efficient and thermally stable broadband NIR luminescence in the tetrahedral coordination environment. This unique property makes K3Ga2(PO4)3:Cr3+ a compelling candidate for advanced photonic applications. Therefore, studying the luminescent properties of Cr3+ rare earth ions doped into tetrahedral sites is of great significance. In the tetrahedral coordination environment of K3Ga2(PO4)3:Cr3+ ions exhibit broadband near-infrared emission spanning from 700 to 1100 nm (λem = 822 nm, FWHM = 124 nm) under 452 nm blue light excitation. Remarkably, the quantum efficiency reaches as high as 70.9%, demonstrating its exceptional potential for advanced photonic applications. In addition, the phosphors demonstrated exceptional thermal stability with near-zero thermal quenching. The NIR luminescence intensity at 373 K and 423 K retained 109.0% and 90.4% of its initial room-temperature value, respectively. This remarkable performance can be attributed to the material's ultra-wide band gap, and minimal electron–phonon coupling. The NIR pc-LED devices, fabricated by integrating the optimized K3Ga1.93(PO4)3:0.07Cr3+ phosphors with a blue LED chip (λex = 455 nm), achieved a near-infrared output power of 274 mW with a conversion efficiency of 5.42% under a driving current of 100 mA. Experimental results demonstrate that the fabricated NIR pc-LED exhibits significant potential for applications in night vision and vein imaging technologies. This study provides a strategic framework for designing high-performance NIR pc-LED devices, utilizing K3Ga2(PO4)3:Cr3+ as an efficient phosphor-converted light source, and offers valuable insights for practical implementation in advanced optical systems.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 9.8
Kaiqi Wu,Chengjin Peng,Fanglin Wu,Liyuan Huang,Liang Lan,Liqiang Kang,Yecheng Liu,Xin Ao,Shan Fang
NASICON-type solid electrolytes exhibit substantial potential for application in all-solid-state lithium metal batteries (ASSLMBs) with a high energy density, attributed to their broad electrochemical window, high ionic conductivity, and excellent air stability. Nevertheless, the practical application is severely limited by inadequate chemical stability upon interaction with lithium metal. To address this challenge, a multifunctional interlayer was developed to suppress the detrimental reaction between Li metal and Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP). The interlayer exhibits outstanding interfacial compatibility and minimized interfacial This interlayer was fabricated through the in-situ solidification of poly(ethylene glycol) methyl ether acrylate with cerium trifluoride, combined with ionic liquid (named as PCEIL). The interlayer exhibits outstanding interfacial compatibility and minimized interfacial resistance, which enables the Li|PCEIL-LAGP-PCEIL|Li symmetric battery to achieve stable cycling over 1000 h at 0.1 mA cm −2 without short-circuiting. Additionally, this interlayer enables superior performance in Li|PCEIL-LAGP-PCEIL|LiFePO 4 cells, with a remarkable capacity retention of 96.5 % after 250 cycles at 0.2C, and an impressive average Coulombic efficiency of 99.8 %. Therefore, this work provides effective strategies to stabilize NASICON-type solid electrolytes and lithium metal, promoting the development of high-performance ASSLMBs.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 16
·118714
·
IF 6.3
Yuan Liu,Jin Wang,Qing Tao,Xi Zhang,Junxia Wang
In this work, Sr 0.5 Zr 2 (PO 4 ) 3 –high-entropy ( Ln 1/ n )PO 4 monazite dual-phase ceramics with n = 5, 6, and 7 were prepared by microwave-assisted sintering for high-level waste immobilization, where Ln 1/5 = (La, Nd, Sm, Eu, Gd) 1/5 , Ln 1/6 = (La, Nd, Sm, Eu, Gd, Dy) 1/6 , and Ln 1/7 = (La, Nd, Sm, Eu, Gd, Dy, Ho) 1/7 . After 28 days of leaching at pH 4.0, 6.2, and 10.0, the LR Sr and LR Ln-average values for the n = 5 samples were 10 −4 –10 −3 and ∼10 −6 g·m −2 ·d −1 , respectively. Both phases exhibited optimal chemical durability at pH 6.2, and Sr and Ln release mechanisms were pH-dependent. After 28 days of leaching in deionized water, the LR Sr and LR Ln-average values for the n = 5, 6, and 7 samples were 10 −4 –10 −3 and 10 −7 –10 −6 g·m −2 ·d −1 , respectively. Increasing configurational entropy in the high-entropy ( Ln 1/ n )PO 4 monazite phase indirectly reduced Sr release through phase-coupled effects, whereas average Ln release remained nearly unchanged.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Rawiyah Alkahtani,Ahmad Iqbal,M.S. Al-Buriahi,Muhammad Ali Hamza Shahbaz,Amir Muhammad Afzal,Nora Mobark Farhan,Sohail Mumtaz,Abhinav Kumar
A MIL-53(Al)@KTi 2 (PO 4 ) 3 @rGO was successfully synthesized through hydrothermal and modified Hummers' methods. • The integration of porous MIL-53(Al) and conductive rGO enhanced charge transport and electroactive site accessibility. • The MIL-53(Al)@KTi 2 (PO 4 ) 3 @rGO electrode delivered a high specific capacity of 1189.23C g −1 . • The hybrid SC achieved an energy density of 45 Wh kg −1 and a power density of 2773 W kg −1 . • The ternary electrode showed a low overpotential of 46 mV and a Tafel slope of 49 mV dec −1 . The rising requirement of sustainable and multifunctional electrodes for energy storage and production has stimulated significant interest in advanced electrode architectures. In this study, a MIL-53(Al)@KTi 2 (PO 4 ) 3 @rGO composite was fabricated by means of combined hydrothermal and modified Hummers approach. The composite was rationally designed by integrating the MIL-53(Al), the favorable ionic transport characteristics of NASICON-type KTi 2 (PO 4 ) 3 , and the highly conductive network of rGO, there by promoting efficient charge and ion transport. Electrochemical evaluation in a three-electrode cell demonstrated a high specific capacity of 1189.23C g −1 . When assembled into a two-electrode supercapacitor device, the material delivered an energy density of 45 Wh kg −1 at a power density of 2773 W kg −1 . The device also maintained 92% of its initial capacity with a Coulombic efficiency of 97% after 10,000 consecutive charge–discharge cycles, indicating strong electrochemical durability. In addition to its energy storage performance, the MIL-53(Al)@KTi 2 (PO 4 ) 3 @rGO electrode demonstrated promising catalytic activity for the hydrogen evolution reaction, requiring only 46 mV overpotential to achieve the targeted current density and exhibiting a Tafel slope of 49 mV dec −1 . These results highlight the synergistic contribution of the MOF, NASICON phosphate, and rGO components and establish MIL-53(Al)@KTi 2 (PO 4 ) 3 @rGO as a promising multifunctional platform for advanced supercapacitor systems and electrocatalytic hydrogen production.
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