JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jinhong Song,Chen Zhang,Zejian Zheng,Shizhe Huo,Yihan Lin,Fei Yang,Lei Liu
SnO 2 layer between Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) and lithium anode was prepared through simple scratch-coating process to improve interface properties. The physical phase, morphology, and electrochemical properties of Li/SnO 2 /LAGP structure were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical analytical methods. It was found that SnO 2 layer effectively improved the interface stability of LAGP and lithium anode. The prepared Li/SnO 2 /LAGP/SnO 2 /Li symmetric cell exhibited a large critical current density of 1.8 mA cm −2 and demonstrated excellent cycling characteristics. The polarization voltages of symmetric cell were 0.1 V and 0.8 V after 1000 h of cycling at current densities of 0.04 mA cm −2 and 0.5 mA cm −2 , respectively. Li/SnO 2 @LAGP/LiFePO 4 solid-state full cells were also assembled, exhibiting a discharge specific capacity of 150 mAh g −1 after 200 cycles at 0.1C with capacity retention rate of 96 %. The good interface properties of Li/SnO 2 /LAGP structure are attributed to the transformation of SnO 2 layer into a buffer layer containing Li 2 O, Sn 0 , and Li x Sn y alloy during cycling process, which effectively inhibits the reduction reaction between LAGP and lithium anode.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yilin Ge,Yushan Li,Feng Wang,Xiaoqin Tan,Peng Liu,Dianhui Wang,Wentong Zhou,Qingrong Yao,M.-Sadeeq Balogun (Jie Tang),Dan Huang,Jianqiu Deng
The development of low-cost and eco-friendly electrode materials is crucial for the next-generation rechargeable lithium-ion batteries (LIBs). Herein, the single-phase Na 1.2 Fe 4 (PO 4 ) 3 (NFP) with a monoclinic NaCo 4 (PO 4 ) 3 -type structure is demonstrated to be a suitable anode material for LIBs. The NFP anode exhibits superior high-rate performance, releasing an initial charge capacity of 128.6 mAh g −1 at 10C and a high-capacity retention rate of 86.7% over 1500 cycles. The prominent rate performance and cycling stability of the NFP anode are attributed to the stable single-phase crystal structure and fast Li-ion diffusion verified by galvanostatic intermittent titration technique (GITT). Furthermore, the structure evolution and Li-ion diffusion pathway of the NFP anode are clarified by ex-situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and first-principles calculations.
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Materials Today Nano
·
2022
·
IF 13.364
Q. Sun,X. Chen,J. Xie,C. Huang,X. Xu,J. Tu,C. Shen,Y. Jin,K. Zhang,F. Chen,T. Zhu,X. Zhao,J. Cheng
Garnet-type Li 7 La 3 Zr 2 O 12 (LLZO) ceramics has been considered as an ideal solid-state electrolyte for Li metal cells because of its high ionic conductivity and relatively stable interface with Li. However, it is electrochemically incompatible with some high-voltage cathodes, e.g. LiCoO 2 . In this work, a nanoscale Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) fast ion conductor was coated on LiCoO 2 (only 1 wt% LATP), bringing obviously enhanced interfacial compatibility with a composite electrolyte composed of Al, Nb-codoped LLZO and polyethylene oxide (PEO). A free-standing, flexible and ultrathin (20 μm) electrolyte membrane was successfully fabricated by a facile and scalable route, even though with a high ceramics content (67 wt%). Quasi-solid-state coin and pouch-type Li cells were assembled with the LATP-coated LiCoO 2 cathode, free-standing composite electrolyte and Li anode, together with soft interface modification by in-situ polymerization. The cells show stable cycling due to combined factors of enhanced electrode/electrolyte compatibility, ultrathin nature of the electrolyte membrane and the in-situ built soft interface. The pouch cells can be cycled for 300 cycles at 0.3 C and 60 °C with 80% retention. The pouch cells can endure abuse tests of bending, cutting and nail penetration. At a practical LiCoO 2 loading of 3 mAh cm −2 , the Li|LiCoO 2 pouch cell still shows stable cycling with 90% retention after 100 cycles at 60 °C (0.2 C charge/0.5 C discharge). This work provides a practical method to fabricate high-performance solid-state Li cells.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Mingxuan Zong,Yanjiang Zhang,Jianquan Liang,Xinghai Li,Qi Qi,Kangyi Chen,Li Zhao,Changsong Dai
The recently discovered Na 3 MnTi(PO 4 ) 3 cathode material has an extremely high theoretical capacity, but its poor cycling performance makes it challenging to apply. In this work, a series of NASICON-type Na 3+x MnV x Ti 1-x (PO 4 ) 3 /C (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1) cathode materials were prepared by sol-gel method for sodium-ion batteries. X-ray diffraction (XRD) indicates that vanadium doping has increased the cell spacing within the material and the cell volume. From the results of X-ray photoelectron spectroscopy (XPS) and Energy dispersive X-ray spectroscopy (EDS) mapping images, it is shown that vanadium has been successfully doped into the material. Among them, the Na 3·3 MnV 0·3 Ti 0·7 (PO 4 ) 3 /C delivers an outstanding specific capacity (121.7 mAh g −1 at 0.1C, C = 135 mA g −1 ) and Na 3·4 MnV 0·4 Ti 0·6 (PO 4 ) 3 /C shows an excellent capacity retention (80.88 % after 1500 cycles at 1C). Notably, the coulombic efficiency of both materials during cycling is close to 100 %, indicating that these materials have great practical application value.
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PROGRESS IN SOLID STATE CHEMISTRY
·
2026
·
IF 9.7
Chao Wei,Jingyu Ran,Jie Zhang
The wideband near-infrared (NIR) phosphors for next-generation intelligent NIR light sources are becoming a research hotspot in the field of luminescent materials due to their potential applications in optical sensing, biological imaging, and smart lighting. This study reports a Cr 3+ -activated A 3 B(PO 4 ) 3 -type (Sr 3 Lu(PO 4 ) 3 ), abbreviated as SLP) near-infrared phosphor. Under 466 nm blue light excitation, SLP:Cr 3+ phosphor exhibits a broad near-infrared emission from 700 to 1200 nm with a peak wavelength at 860 nm, a full width at half maximum (FWHM) of 141 nm, and an initial quantum yield of 31.48%. Structural and spectroscopic characterization confirms that Cr 3+ preferentially occupies the octahedral coordination sites of Lu 3+ in the matrix, forming a weak crystal field environment that favors the spin-allowed 4 T 2 → 4 A 2 transition of Cr 3+ , leading to broad near-infrared emission. Additionally, by substituting Y 3+ for the B-site (Lu 3+ site), the luminescent intensity of the material is significantly enhanced, and the quantum yield is increased to 81.53%. Furthermore, the introduction of Yb 3+ constructs a Cr 3+ →Yb 3+ energy transfer system, further optimizing the luminescent performance. Although the phosphor exhibits severe thermal quenching, the packaged near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) maintain a low surface temperature of 59.5 °C at 500 mA, ensuring reliable operation. The phosphor also exhibits excellent temperature sensitivity (max relative sensitivity: 3.33%·K −1 ) for fluorescence thermometry. Practical applications including invisible QR code encryption, night vision, biological imaging, and long-distance illumination are demonstrated, showcasing the versatility of the developed NIR pc-LED. This work provides a high-performance NIR phosphor candidate for multi-functional smart light sources.
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Journal of Energy Storage
·
2023
·
IF 9.4
Fusheng Yin,Zhijun Zhang,Yuling Fang,Chunwen Sun
NASICON structured Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) has attracted widespread attention due to its simple preparation and excellent stability towards water and air. However, there are many problems such as high interfacial resistance between electrolyte and electrodes as well as low ionic conductivity of LATP. In this paper, the effect of F doping on Li ion diffusion channel in electrolyte was investigated in detail by density functional theory (DFT) calculation. The results show that F doping can effectively reduce the formation energy of Li vacancy. Meanwhile, it can also reduce the diffusion energy barrier and induce the high-energy Li ions at 36f site to carry out synergistic diffusion via various ways at the same time. Then, the F-doped LATP electrolyte was prepared successfully. Its ionic conductivity is as high as 0.358 mS cm −1 at room temperature . At the same time, the solid-state lithium metal batteries with F-doped LATP electrolyte shows a high capacity of 136.2 mA h g −1 at 0.5C and excellent cyclability for 200 cycles. These results demonstrate that F doping may be an effective way to improve the performance of LATP electrolyte.
研究领域:
材料科学
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电化学
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储能技术
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固态电池
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计算材料科学
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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.
研究领域:
材料科学
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光学材料
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固态照明
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光子学
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半导体器件
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Liwei Liu,Yutong Wang,Chunmeng Zhang,Shaochen Wang,Guoyong Huang
LiTi2(PO4)3 (LTP) is widely recognized as a promising anode material for aqueous lithium-ion batteries due to its stable three-dimensional framework structure and working potential within the aqueous electrolyte potential window. However, the low conductivity of pure-phase LTP poses a significant challenge that must be overcome for its practical application. In this work, N-doped carbon-coated LTP (NC@LTP) composites with a layered flower-like morphology were synthesized via an organic precipitation method. The N-doped carbon layer improved the conductivity and hydrophilicity of the anode and caused carbon defects that facilitated Li+ transport. The initial specific capacity at 10 C was enhanced from 39.4 to 81.5 mAh g–1 after N-doping. The pouch cells retained 92.7% of their capacity after 150 cycles at 1 C and demonstrated excellent safety in abuse tests. In addition, the modification mechanism of the N-doped carbon layer was verified through DFT calculations. This study provides references and ideas for the modification of high-performance aqueous lithium-ion battery electrode materials.
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RARE METALS
·
2023
·Vol. 42
·期 10
·3387-3398
·
IF 8.8
Dai Jing,Jing Jian,Yang Jian-Ping,Zhang Wen,Liu Shao-Xiong,Wang Qian-Fu,Wen Jia-Xing,Hu Hai,Li Hui-Fang,Liu Li
Na superionic conductor (NASICON)-type La 0.33 Ti 2 (PO 4 ) 3 (LaTP) is firstly proposed as sodium/potassium storage materials. The density functional theory (DFT) calculations show that LaTP has good electronic character and low Na + /K + migration barriers. The flexible La 0.33 Ti 2 (PO 4 ) 3 /C nanofiber film is synthesized via electrostatic spinning and investigated as free-standing electrode applied to sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) in this work. The low band gap and Na + /K + migration barriers of LaTP, unique morphology, and complete conductive carbon net allow the La 0.33 Ti 2 (PO 4 ) 3 /C nanofibers film to deliver high capacity (296.3 mAh·g −1 for SIBs and 235.8 mAh·g −1 for PIBs), excellent rate performance (142.5 mAh·g −1 for SIBs and 50.5 mAh·g −1 for PIBs at 1.00 A·g −1 ), and superior cyclability above 1000 cycles. The full-cell tests show that the material has a good application prospect, indicating a promising flexible anode material for SIBs and PIBs. Graphical abstract
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Journal of Energy Storage
·
2023
·
IF 9.4
Jun Cong,Shao-hua Luo,Peng-yu Li,Kun Li,Peng-wei Li,Sheng-xue Yan
Na 3 V 2 (PO 4 ) 3 is particularly suitable as cathode materials for sodium ion batteries (SIBs). Its NASICON structure is not only conducive to the rapid migration of Na + , but also has less volume deformation during Na + deintercalation, and the main frame mechanism remains unchanged. However, owing to its own structure, the electronic conductivity is limited, which limits its practical application. Here, on the basis of carbon coating to enhance the electronic conductivity, the effect of sodium site doping of K + on the structure and properties of Na 3 V 2 (PO 4 ) 3 /C is deeply explored by comparing series Na 3-x K x V 2 (PO 4 ) 3 /C (x = 0, 0.05, 0.1, 0.15, 0.2). The initial discharge capacity of Na 2.9 K 0.1 V 2 (PO 4 ) 3 /C is 107.7 mAh·g −1 in the potential range of 2.5–3.8 V at 0.2C, and the capacity remains 95 % after 300 cycles. The excellent performance of Na 2.9 K 0.1 V 2 (PO 4 ) 3 /C benefits from the large radius of K + as functional support ions, which lightly relieves the deformation pressure of Na + during the deintercalation process, thereby stabilizing the crystal structure. Moreover, the doping of K + plays a critical role in improving the diffusion coefficient of Na + . Density functional theory (DFT) calculations demonstrate that the Na-site doping of K + can enhance the electronic conductivity of the material, which in turn brings excellent electrochemical performance. Prime novelty statement • On the basis of carbon coating, Na 2.9 K 0.1 V 2 (PO 4 ) 3 /C cathode materials with excellent electrochemical performance are obtained by doping K at theNa-site. • The effect of Na-site doping of K + on the structure and properties of Na 3 V 2 (PO 4 ) 3 /C is deeply explored by comparing series Na 3-x K x V 2 (PO 4 ) 3 /C (x = 0, 0.05, 0.1, 0.15, 0.2). • The mechanism of excellent electrochemical performance and structural stability caused by Na-site doping of K + is revealed theoretically by DFT calculation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Ziqing Li,Pengfei Zhu,Jimin Ding,Yang Chen,Zhenyan Wang,Nianjing Ji,Xiulan Duan,Huaidong Jiang
Inorganic upconversion materials show significant importance in both basic research and applied area, and searching for suitable host material and understanding of fundamental photophysical process are particularly worth studying in upconversion application. Herein, a heavily Yb 3+ -substituted langbeinite-type Rb 2 Ti 0.80 Yb 1.20 (PO 4 ) 3 (RTYP) millimeter-sized single crystal, which has been successfully grown by high temperature solution method, exhibits efficient dual-color upconversion photoluminescence under 980 nm excitation. The lifetimes of two-photon blue emission and one-photon red emission are 4.1 μs and 17.1 μs, respectively. X-ray structural analyses reveal that the dual-color emissions are ascribed to disordered Yb 3+ -Ti 4+ pairs and crystal defect, and the higher intensity of red emission is attributed to Yb 3+ -defect energy transfer activated by Ti 4+ . Notably, the blue emission originates from cooperative luminescence of Yb 3+ dimer, and the red emission originates dominantly from the cooperative sensitization of the intrinsic defect caused by excited Yb 3+ dimer. Moreover, RTYP with disordered structure shows high thermal stability up to 1,150 °C. This work not only demonstrates the promising potential of langbeinite-type materials in multicolor upconversion application, but also sheds light on the photophysical process associated with disordered crystal structure.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yang Chen,Jianda Niu,Siheng Zhang,Zhixian Dong,Jinbao Xu,Caihong Lei
The quest for next-generation energy storage systems has led to the development of high-voltage all-solid-state lithium metal batteries (ASSLMBs), which promise unprecedented energy density and safety. However, the challenge lies in creating of a robust electrolyte that can meet high room temperature ionic conductivity, Li-ion transference number and a wide electrochemical stability window (ESW) while maintaining flexibility and compatibility with lithium metal anodes. Here, novel polyurethane-based composite polymer electrolytes (CPEs) have been successfully fabricated by the cross-linking reaction of poly(1,5-dioxepan-2-one) diols (poly(ether-ester) soft segment) and hexamethylene diisocyanate trimer (hard segment) (PDH) blending with inorganic NASICON-type ceramic fillers Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (PDH@LATP). The resulting CPE exhibits an impressive ionic conductivity of 1.65 × 10 −4 S cm −1 at room temperature and a Li-ion transference number of 0.63, which is attributed to the amorphous structure of PDH and the formation of an interconnected ionic pathway by the inorganic filler. The incorporation of LATP also improve the ESW of CPE to 5.3 V while maintaining good mechanical properties. Therefore, the assembled LiFePO 4 /PDH@LATP/Li batteries displayed low interfacial resistance, Li dendrite suppression, high specific capacity and excellent cyclic performance. The high-voltage LiNi 0.5 Co 0.2 Mn 0.3 O 2 /PDH@LATP/Li batteries also exhibits good cycling performance and durability. The design principles and materials presented herein provide a blueprint for the next wave of ASSLMBs.
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