APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongen Shi,Yanzhong Wang,Zhen Tian,Baofeng Zhang,Li Guo,Yanjun Chen
To improve the inherent conductivity and extend the cycling durability of Na 3 V 2 (PO 4 ) 3 (NVP), this study suggests a technique for synthesis of phenol-formaldehyde (PF) resin-derived lamellar intercalated spherical NVP (PF-NVP/C) structures via solvothermal method. The unique lamellar intercalated sphere structure typically possesses good mechanical toughness, enabling better tolerance to the current impact. Moreover, spherical morphology features a significantly enlarged specific area of 144.32 m 2 g -1 , facilitating full contact between electrolyte and electrode, and providing additional active sites for Na + storage. Coupled with protective effect of carbon coating layers, the cycling stability is significantly improved. Meanwhile, highly conductive graphitized carbon skeleton from the pyrolysis of PF bonding with the uniform amorphous carbon layers constructs favourable networks for electronic transportation. Notably, the modified PF-NVP/C delivers a capacity of 115.5 mAh g -1 at 0.1 C. Remarkably, it can maintain a high capacity of 71.1 mAh g -1 and keeps 50.8 mAh g -1 even after 16000 cycles at 50 C, exhibiting outstanding cycling stability. Ex-situ XRD indicates the redox reaction of V 3+ /V 4+ is highly reversible. Furthermore, by comparing morphological and electrochemical kinetic characteristics of the PF-NVP/C before and after cycling, further evidence is provided to demonstrate its unique lamellar intercalated spherical morphology and excellent structural stability.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhihao Wang,Mengxiao Zhang,Jiao He,Yongan Tang,Tingchao He,Qiang Sun,Dianyuan Fan,Yu Wang
The development of emitting materials that present both photoluminescence (PL) and X-ray excited optical luminescence has recently been attracting rising research interest for visualization applications. We introduced in this study the hydrothermally crystallized (Sr 1- x Mn x ) 5 (PO 4 ) 3 F 1- y Cl y ( x = 0–0.05, y = 0–0.40) nanorods with favorable PL and X-ray excited optical luminescence properties after composition modulating. The effects of solution pH and Cl − incorporation on structure and morphology of the products were firstly unveiled. (Sr 1- x Mn x ) 5 (PO 4 ) 3 F gives green emission at ∼548 nm ( 4 T 1 ( 4 G) → 6 A 1 ( 6 S)) under either 402 nm excitation or X-ray irradiation, and the optimal PL and X-ray excited optical luminescence were observed at x = 0.03. The replacement of F − by larger Cl − led to the generation of an amount of Frenkel defects (the dislocated F − and anion vacancies V F . ) along the c -axis, benefit from which the (Sr 0.97 Mn 0.03 ) 5 (PO 4 ) 3 F 1- y Cl y samples present enhanced PL and X-ray excited optical luminescence intensities by factors of 1.6 and 7.4, respectively, and the corresponding optimal y values are determined to be 0.20 and 0.30. Fluorescence decay analysis found steadily shortened fluorescent lifetime for Mn 2+ at higher Mn 2+ and Cl − concentrations, and the underlying mechanism was discussed. The (Sr,Mn) 5 (PO 4 ) 3 (F,Cl) apatite material, with enhanced PL and X-ray excited optical luminescence, may find novel applications for both lighting and scintillating.
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高影响因子
Energy Storage Materials
·
2019
·
IF 0
Junfeng Yang,Dongdong Li,Xusheng Wang,Xinxiang Zhang,Jian Xu,Jitao Chen
NASICON-structure Na 3 V 2 (PO 4 ) 3 (NVP) is a potential cathode for sodium ion battery , which however needs nano-crystallization to improve its rate performance. On the other hand, most practical electrodes are fabricated through slurry printing process, which needs to control the particle size to avoid the falling of the composite. Herein, for practical high-loading electrode fabrication, the micro-nano architecture, i.e. the micro particle plus nano channels inside, is suggested in this paper. The micro-nano information about NVP is obtained through Ga + focused ion beam-scanning electron microscopy to reconstruct the 3D model of a single NVP particle, fully exhibiting the continuous nano channels inside the micro sphere . The as-obtained NVP/C sample in the micro size exhibits remarkable enhanced rate performance of 106, 104, 101, 96, 89, 70 and 44 mAh g −1 at rates of 2, 5, 10, 20, 50, 100 and 200 C respectively, compared to the control sample in the nano size with the capacity of 106, 103, 85, 77 and 60 mAh g −1 at 2, 5, 10, 20 and 50 C respectively, meanwhile maintaining good adhesion towards Al foil and electrochemical performance at the areal loading of 10 mg cm −2 .
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 5
·6876-6887
·
IF 3.741
Erqing Zhao,Yudi Guo,Yuan Xin,Guangri Xu,Xiaowei Guo
Summary Poly(ethylene oxide) (PEO) polymer electrolyte has been regarded as a potential solid electrolyte which can be applied in all-solid-state lithium-ion batteries (ASSLIBs). Nevertheless, low electrochemical properties and poor electrolyte/Li anode interfacial stability hinder its further application. In our work, the Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) nanomaterials with Nasicon structure have been synthesized using a simple solvent-thermal method, followed by being embedded into PEO polymer to form LATP filled PEO solid composite electrolytes. Effects of LATP content and particle size on electrochemical performances of solid electrolytes have been studied. By adjusting the calcination temperature, the uniformly distributed Nasicon-type LATP powders with different sizes can be obtained. The electrochemical properties of PEO polymer electrolyte have been effectively enhanced by filling LATP nanoparticles. The composite electrolyte filled with 5 wt% LATP particles calcined at 850°C exhibits a high ionic conductivity of 5.24×10 −4 S cm −1 at 55°C, which has a high electrochemical stability window of over 5 V versus Li/Li + and a superior interfacial stability with Li metal. A LiFePO 4 /Li ASSLIB fabricated with the optimum composite electrolyte shows the excellent rate capability, and its discharge capacities at 0.2C, 0.5C, 1C, and 2C are 151.97, 151.56, 145.51, and 128.02 mAh·g −1 . Moreover, the discharge capacity of the cell decreases from 151.69 to 130.53 mAh·g −1 after 100 charge-discharge cycles at 0.5C rate, and the corresponding capacity retention is 86.05%. These results demonstrate that LATP nanoparticles obtained via the solvent-thermal method are the alternative fillers for PEO polymer electrolyte.
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高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Junli Shi,Yonggao Xia,Shaojie Han,Lifeng Fang,Meizi Pan,Xiaoxiong Xu,Zhaoping Liu
Since 5 V lithium ion batteries have attracted more and more attentions and are deemed to be an important tendency in the future, the matched design of the separators has also become a necessary and significant work. In this work, the lithium ionic conducting glass ceramic Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 -polypropylene (PP) based inorganic–organic composite separator (LAGP-PP) is prepared. Compared with the pristine PP separator, the LAGP-PP separator owns enhanced thermal stability and wettability . Meanwhile, the LAGP-PP separator shows higher ion conductivity than the traditional Al 2 O 3 coated PP separator due to the more facile lithium ion diffusion channels in the coating layer . The superior C-rate capacity and cyclability in the LiNi 0.5 Mn 1.5 O 4 based 5 V lithium ion batteries indicate that the LAGP-PP separator is a good alternative for the traditional inert inorganic ceramic coated polyolefin separators and is a kind of promising candidate separator for the high voltage lithium ion batteries.
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高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 12
·期 1
·217-230
·
IF 6.1
Jinggao Wu,Canyu Zhong,Xiaofan Chen,Jing Huang
Li3V2(PO4)3 (LVP) coated with N and S co-doped carbon (NSC) was investigated by DFT calculation, suggesting that NSC significantly enhances electronic conductivity and lowers the energy barrier to Li+ migration in comparison to LVP-embedded in pristine carbon. To experimentally confirm the theoretical prediction, three types of LVP particle embedded in N and S co-doped porous carbon (LVP@NSC) materials with various nitrogen and sulfur molar ratios (N : S = 1 : 1, 1 : 2 and 2 : 1) were prepared by a facile freeze-drying-assisted wet chemical route associated with a post-annealing process. When used as a cathode for a lithium-ion battery (LIB), the designed LVP@NSC with N : S = 1 : 2 exhibits outstanding high rate capacities of 124.4 and 107.85 mA h g−1, respectively, at 2 and 20 C in a voltage window of 3.0–4.3 V, and an ultralong cycling stability of 500 times at 20 C while retaining a reversible capacity of 100.22 mA h g−1, possibly due to its smallest charge transfer resistance and highest Li+ migration coefficient, which is in good agreement with the theoretical prediction. This work not only reveals the critical role of an interaction mechanism between NSC and LVP, but also offers great potential for high-energy density LIB applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Lifan Wang,Danya Gong,Siheng Niu,Leiying Wang,Qinling Shi,Xindong Wang,Jinli Qiao,Guicheng Liu,Chun Zhan
Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP)-based all-solid-state lithium battery (ASSLB) assembled with Ni-rich layered cathode (NCM), of much interest because of its high energy–density and safety, presents many challenges, one of which is poor interfacial instability resulting in large interfacial resistance. Nevertheless, the mechanism of electrochemical side reactions on the interfacial deterioration hasn’t been much investigated specifically, despite their close relationships in electrochemical performance. Herein, we report that the fundamental origin of interfacial chemical reactions is the migration of Ni 2+ from the nickel-rich cathodes to the NCM/LATP interface, for the first time, and the simultaneous chemical reaction with Ti 4+ in LATP, followed by the decomposition of LATP. In view of this, an elaborately designed regulation strategy, in-situ construction of the layered perovskite La 4 NiLiO 8 buffer layer , is proposed to effectively reduce the content of Ni 2+ on the surface of the nickel-rich cathodes and alleviate the chemical reaction between Ni 2+ and Ti 4+ , thereby improving the interfacial stability between NCM and LATP. As a result, the assembled ASSLBs with the La 4 NiLiO 8 buffer layer exhibit high initial discharge capacity (171.49 mAh/g) and excellent cycling performance with 89.47 % capacity retention after 100 cycles at 0.1C.
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高影响因子
SOLID STATE IONICS
·
2017
·
IF 2.354
Wei Zheng,Xiaobing Huang,Yurong Ren,Haiyan Wang,Shibiao Zhou,Yuandao Chen,Xiang Ding,Tao Zhou
Porous spherical Na 3 V 2 (PO 4 ) 3 /C composites were synthesized by a spray drying-assisted approach combined with microwave calcinations , and then characterized as cathode materials for sodium-ion batteries. The effect of carbon content on Na 3 V 2 (PO 4 ) 3 /C were investigated by X-ray diffraction, scanning electron microscopy, Brunauer–Emmet–Teller method, charge-discharge test, cyclic voltammetry and electrochemical impedance spectra measurements. The results demonstrate that the Na 3 V 2 (PO 4 ) 3 /C composite with 5wt.% carbon exhibits the best electrochemical performance among the as-prepared three Na 3 V 2 (PO 4 ) 3 /C samples. It delivers the discharge capacity of 97.9 mAh g − 1 , 93.5 mAh g − 1 at 0.2 C and 5 C, respectively. Furthermore, 97.9% of its initial capacity is remained after 500 cycles at a high rate of 5 C. The superior electrochemical performance can be ascribed to the improvement of electronic and ionic conductivity by carbon coating and porous spherical structure.
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高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 15
·e202200817
·
IF 9.14
Jiarong He,Tao Tao,Fan Yang,Zhipeng Sun
Graphical Li? Na(h) . The intercalation mechanism and cathode electrolyte interphase property of Li-free polyanionic cathodes such as Na 3 V 2 (PO 4 ) 3 and Na 3 (VOPO 4 ) 2 F are systematically demonstrated. They show intriguing electrochemical performances for lithium-ion batteries towards a sustainable society due to the abundance of Na resource, providing appropriate crystallographic sites for Li + /Na + intercalation/deintercalation due to the existence of pillar Na + ion residing in the structure. Although lithium-ion batteries (LIBs) are promising towards high energy density and superior safety energy storage systems (ESS), severe depletion of Li reserve cannot meet the ever-growing demand for LIBs due to the uneven distribution and limited amount of Li resource. Li-free polyanionic cathodes, such as Na 3 V 2 (PO 4 ) 3 (NVP) and Na 3 (VOPO 4 ) 2 F (NVOPF), show intriguing electrochemical performances with prospective future for LIBs due to their appropriate crystallographic sites, robust host structure, and abundant Na resource. In this work, NVP and NVOPF were systematically investigated as cathodes for LIBs using different voltage windows of 2.5–4.3, 2.0–4.3, and 1.5–4.8 V, along with their electrochemical mechanisms, cathode electrolyte interphase properties, and electrode morphologies for comparison. Ex-situ X-ray diffraction, ex-situ X-ray photoelectron spectroscopy, and post-mortem scanning electron microscopy revealed that their mechanisms shifted from a predominant Na + intercalation/deintercalation in the first charging/discharging to a mixed Li + /Na + intercalation/deintercalation at the subsequent cycling. Due to the residual Na + acting as pillar in the structure, NVP and NVPF could serve as robust host framework, providing appropriate crystallographic sites for repeated Li + /Na + intercalation/deintercalation. NVP electrode delivered a higher discharge capacity of 107.6 mAh g −1 with superior capacity retention of 84.3 % after 1000 cycles (2.5–4.3 V, 100 mA g −1 ) than NVOPF electrode (97.3 mAh g −1 , 68.8 %). Electrode polarization and kinetic analysis manifested one energetically similar and two energetically nonequivalent crystallographic Na sites within the R c and I 4 /mmm polyanionic structure of NVP and NVOPF. This work comprehensively demonstrates the feasibility and prospect of sodium-based NVP and NVOPF polyanions serving as advanced Li-free cathodes for LIBs, which provides novel insights into seeking Li-free candidates as prospective cathodes for LIBs towards a more sustainable society and a cost-effective battery manufacturing system.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Rui Ling,Bingqiang Cao,Wentao Qi,Chao Yang,Kaier Shen,Zhiyuan Sang,Jinze Guo,Dongli Xie,Shu Cai,Xiaohong Sun
Na 3 V 2 (PO 4 ) 3 (NVP) with a unique 3D open NASICON framework is regarded as an attractive electrode material in sodium-ion batteries (SIBs) due to its wide range of Na + accommodations. Nevertheless, the practical implementation of NVP is hampered by the unsatisfying capabilities and cycling stability at high rates of charging/discharging, which attribute to low electron/ion conductivities. Herein, a novel NVP@carbon/N-doped graphene aerogel (NVP@C/N-GA) is designed via a facile precursor infiltration followed by the post-heating treatment process. In this delicate design, the 3D porous and interconnected framework endows with bicontinuous ion/electron transport pathways for the rapid electrochemical reaction ; while the carbon layer combined with N doped graphene aerogel (N-GA) provides long-range conductive networks throughout the whole electrode and ensure the cycling stability. Consequently, the NVP@C/N-GA electrode is shown to achieve unprecedented rate capabilities and outstanding ultralong cycling stability as cathode (74.1 mA h g −1 at 100 C; 84% capacity retention at 20 C after 12,000 cycles) and anode (109.3 mA h g −1 at 20 C; 87% capacity retention at 20 C after 5000 cycles), both of them outperforms the majority of previously reported literature. Moreover, the symmetric full cell assembled by NVP@C/N-GA also demonstrates admirable electrochemical properties . Thus, this work may provide new avenues for constructing electrodes with high rate capability and ultralong-life.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 11
·9258-9267
·
IF 2.324
Xu Liang,Xu Guobao,Chen Zhuo,Wei Xiaolin,Cao Juexian,Yang Liwen
NaTi 2 (PO 4 ) 3 (NTP) with NASICON structure has been regarded as a promising material for sodium-ion batteries (SIBs). However, NTP always exhibits poor cycling stability and rate performance due to slow electronic conductivity. In this work, a free-standing 3D nanocomposite constructed by reduced graphene oxide (rGO), thermally-treated protein (TP) and mesoporous NaTi 2 (PO 4 ) 3 nanocrystals (denoted as MNTP-TP@rGO) is reported. The fabrication includes an electrostatic self-assembly, freeze-drying, mechanical pressing and thermal treatment. In the MNTP-TP@rGO nanocomposite, 3D interconnected carbon network of rGO and TP acts as both a support for the anchored well-distributed MNTP nanocrystals and a current collector. When free-standing MNTP-TP@rGO is used directly as anode in coin-type half-cell, it delivers a high-rate capacity (52.8 mAhg −1 at 50C) and robust cycling stability with the capacity retention of 80% after 1000 cycles at 5C. Furthermore, a full Na-ion battery is constructed using Na 3 V 2 (PO 4 ) 3 /C (NVP/C) as a cathode and free-standing MNTP-TP@rGO as an anode and it exhibits a high specific capacity (58 mAhg −1 at 1C) and outstanding cycling stability (98% capacity retention over 100 cycles at 1C). Our results suggest great potential of the free-standing electrode of MNTP-TP@rGO composite in high-performance SIBs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiangming Cui,Xin Chen,Changzheng Lin,Jingzhao Wang,Zirui Guo,Mi Zhou,Zhouzhou Yao,Jiaxin Zhang,Shiyi Sun,Jianan Wang,Wei Yan
The advancement of high-energy–density and intrinsically safe all-solid-state lithium metal batteries (ASSLMBs) is crucial for the comprehensive electrification of energy consumption. Nevertheless, intrinsic defects in solid-state electrolytes (SSEs) and suboptimal interfacial contacts often lead to uncontrolled dendritic growth during practical battery operation. To address these challenges, this study proposes an integrated optimization strategy for bulk-phase defects and interfacial contacts of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) SSEs based on ultra-fast Joule heating sintering (UHS) technique. Introducing specific sintering auxiliaries and a dual-process sintering approach can achieve the rapid densification of LATP SSEs. Additionally, the thermal pulse welding (TPW) technique for the integrated anode/SSE/cathode further provides superior SSE/electrode interface contact, facilitating the in-situ formation of a continuous ion-conducting network for improved electrochemical kinetics. The optimized Li||LATP||NCM811 ASSLMBs demonstrate exceptional specific capacity (185.9 mAh/g at 0.2 C) and robust cycling stability (90.9 % capacity retention after 100 cycles). This integrated optimization strategy can offer a critical technical reference for the rapid fabrication of high-performance ASSLMBs.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）