JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Zhen-Kun He,Ali Reza Kamali,Zeng-Rong Wang,Qiang Sun,Zhongning Shi,Dexi Wang
Li surface diffusion kinetics is an important parameter in determining the electrochemical performance of metal oxide electrodes used in Li ion batteries. Here, we investigate this parameter in SnO 2 nanobelts . A low cost, simple and facile in-situ calcination method is developed to fabricate highly crystalline SnO 2 nanobelts with surface oxygen vacancies using commercially available tin oxide particles as the precursor. The phase composition , morphology and surface characteristics of the SnO 2 nanobelts are investigated by several techniques, including the X-ray diffraction and photoelectron spectroscopy, high resolution electron microscopy and electrochemical evaluations. The Li ion surface diffusion coefficients of nanobelts are investigated by impendence spectroscopy and sweep voltammetry measurements; and found to be 1.07 × 10 −11 cm 2 s −1 . Such enhanced Li surface diffusion kinetics as well as significant contribution from pseudocapacitance result in an excellent Li-ion storage performance of SnO 2 nanobelts, while the free space between the nanobelts provides morphological stability during prolonged battery cycles.
研究领域:
材料科学
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电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Ke Wang,Youwei Zhao,Peter T. Clough,Pengfei Zhao,Edward J. Anthony
Structurally modified and improved NaBr-co-doped Li 4 SiO 4 ceramics were developed for CO 2 absorption in low-CO 2 -concentration atmospheres. Pure and NaCl-doped Li 4 SiO 4 ceramics were also prepared for comparison. The samples were analyzed by X-ray diffraction, Scanning Electron Microscopy, N 2 adsorption, X-ray photoelectron spectroscopy, differential scanning calorimetry , and thermogravimetric analyses (dynamic and isothermal). The sorption kinetics were obtained using a double exponential model. The results showed that both Na and Br can be introduced into the Li 4 SiO 4 structure and doped on Li and oxygen sites, respectively. The doped sample presented a Li 2 O-enriched surface, guaranteeing abundant Li O sites and are significantly different from previous anionic (CO 3 , F and Cl) doping of Li 4 SiO 4 , Br doping also generated macroporous features with small particle size, these favorable characteristics promoted the surface chemisorption kinetics. Moreover, DSC analysis confirmed the formation of the molten phases during CO 2 absorption, which helps improve the lithium diffusion kinetics . Here, 0.1 mol NaBr doping was used to reach a maximum absorption capacity (>30.0 wt%) in 15 vol% CO 2, suggesting that NaBr-doped Li 4 SiO 4 ceramics have great potential for CO 2 capture at high temperature.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jifei Liu,Yufeng Qi,Bi Fu,Jianfeng Dai,Qing Wang,Xiaojun Zhu,Xiangyu Shi
SnS 2 nanosheet (NS), SnS 2 nanoflower (NF) and SnS 2 NF@reduced graphene oxide (rGO) were synthesized by hydrothermal method . When used as anode materials for lithium-ion batteries (LIBs), SnS 2 NF@rGO exhibits reversible specific capacities of 525 mAh/g at 0.5C after 360 cycles and 412.5 mAh/g at 2.0C, which are significantly enhanced Li storage performance over SnS 2 NS and SnS 2 NF. The detailed electrochemical impedance spectroscopy (EIS) analysis were found that SnS 2 NF@rGO nanocomposite exhibits much reduced internal resistance originated from the decreasing Warburg factor. The electronic conductivity of the cycled SnS 2 NF@rGO is about three times more than that of cycled SnS 2 NS and SnS 2 NF. More importantly, the Li + diffusion coefficients D L i + were calculated using the galvanostatic intermittent titration technique (GITT) method, indicating SnS 2 NF@rGO demonstrated much enhanced Li + diffusion kinetics than that of electrodes without rGO additives. This means that SnS 2 NF@rGO is more suitable to be applied as anode materials for LIBs because the electrochemical performance was enhanced by the improved ionic transport properties, resulting from the increased electronic conductivity by the addition of two-dimensional layer structure rGO with superior electronic conductivity. This study could help us understanding how electronic conductivity contributed to ionic transport kinetics in electrochemical energy storage and conversion (EESC).
研究领域:
材料科学
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能源存储与转换
✓ 已验证
DOI
高影响因子
Advanced Science
·
2019
·Vol. 7
·期 3
·1902538
·
IF 15.804
Mengting Si,Dandan Wang,Rui Zhao,Du Pan,Chen Zhang,Caiyan Yu,Xia Lu,Huiling Zhao,Ying Bai
As one of the most promising cathodes for next-generation lithium ion batteries (LIBs), Li-rich materials have been extensively investigated for their high energy densities. However, the practical application of Li-rich cathodes is extremely retarded by the sluggish electrode–electrolyte interface kinetics and structure instability. In this context, piezoelectric LiTaO 3 is employed to functionalize the surface of Li 1.2 Ni 0.17 Mn 0.56 Co 0.07 O 2 (LNMCO), aiming to boost the interfacial Li + transport process in LIBs. The results demonstrate that the 2 wt% LiTaO 3 -LNMCO electrode exhibits a stable capacity of 209.2 mAh g −1 at 0.1 C after 200 cycles and 172.4 mAh g −1 at 3 C. Further investigation reveals that such superior electrochemical performances of the LiTaO 3 modified electrode results from the additional driving force from the piezoelectric LiTaO 3 layer in promoting Li + diffusion at the interface, as well as the stabilized bulk structure of LNMCO. The supplemented LiTaO 3 layer on the LNMCO surface herein, sheds new light on the development of better Li-rich cathodes toward high energy density applications.
研究领域:
材料科学
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电化学
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能源存储
·
功能材料
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固态离子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Kechun Wen,Mingfu Xia,Pan Deng,Weiqiang Lv,Weidong He
Li diffusion efficiency reflects the kinetics of Li intercalation/de-intercalation in solid electrode materials and determines the rate performances of Li ion batteries. Traditional techniques including the electrochemical impedance spectroscopy, potential intermittent titration technique, potential relaxation technique, galvanostatic intermittent titration technique, and cyclic voltammetry, could lead to significant disagreement on Li chemical diffusion coefficients due to the limited reliability of the parameters required for calculating Li diffusion coefficients. Based on the Nernst-Einstein equation, a double-battery system is proposed for the direct measurement of chemical diffusion coefficients of Li in solid electrodes. With the double-battery system, Li diffusion coefficients in the intercalation/de-intercalation of graphite electrodes featured with phase-transition and double-phase regions, are measured efficiently, with consistent values in the range of 10 −10 –10 −9 cm 2 /s. The direct measurement then allows for the evaluation of the diffusion barrier associated with Li intercalation/de-intercalation in the electrodes.
研究领域:
电化学
·
材料科学
·
能源存储
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 31
·17039-17047
·
IF 12.732
Fuxin Wei,Shufen Wu,Jiliang Zhang,Hongyang Fan,Liuyang Wang,Vincent Wing-hei Lau,Sizhou Hou,Minmin Zhang,Jiafeng Zhang,Bo Liang,Ruirui Zhao
Developing all solid-state lithium ion batteries (ASSBs) is a promising way to solve safety issues surrounding liquid-based batteries, yet the interfacial issues make ASSBs insufficient in providing long-term cycling performance or acceptable rate capabilities. Herein, we propose a new kind of electrolyte configuration, comprising a 3D ceramic framework filled with plastic crystals on the surface, to effectively enhance the interfacial Li diffusion kinetics. The soft plastic crystals enable not only excellent contact with the rigid framework and cathodes, but also rapid molecular reorganization to accommodate the interfacial Li, achieving ultrafast Li diffusion globally via the 3D framework. As a result, the ASSBs with the proposed electrolyte (i.e. garnet-succinonitrile composites) show an extremely low interfacial resistance, providing an initial discharge capacity of 165.3 mA h g−1 and a 95% capacity retention after 100 cycles when using a LiNi0.5Co0.2Mn0.3O2 (NCM) cathode. Furthermore, these NCM-ASSBs using the designed electrolyte even exhibit better cycling performance within a higher voltage range (2.8–4.5 V) than conventional lithium ion batteries (LIBs) using conventional liquid electrolytes (LEs). A capacity retention rate of 92% for 3DLLZO-PCE is demonstrated, against the 85% for LE-LIBs after 50 cycles. We believe that this strategy provides useful guidance for constructing high-performance ASSBs, which is important in their further commercialization.
研究领域:
材料科学
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电化学
·
电池技术
·
固态电解质
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 4
·2309822
·
IF 19
Yue Wang,Dengxu Wu,Penghao Chen,Pushun Lu,Xuefeng Wang,Liquan Chen,Hong Li,Fan Wu
With the growing demand for high-energy-density lithium-ion batteries, Li-rich Mn-based layered oxide (LLO) cathodes with high specific capacity and low cost receive significant attention in conventional liquid lithium-ion batteries. However, LLO is rarely used in sulfide all-solid-state lithium batteries (ASSLBs) because of severe interfacial side reactions with sulfide solid electrolytes (SEs), especially at a high operation voltage of 4.8 V (vs Li/Li + ). In this work, a dual-function modification strategy is proposed to enable electrochemically stable LLO in sulfide ASSLBs. The covalent Ru─O bond formed by Ru-doping can not only stabilize lattice oxygen, preventing further interfacial decomposition involving oxygen, but also enhance the ability of Li diffusion in Li 2 MnO 3 component, and then stimulate the activation of Li 2 MnO 3 phase. Meanwhile, the surface sulfidation strategy establishes a highly stable interface, contributing to the rapid ionic transport at LLO/LPSCl interface. Results show that the modified LLO in sulfide ASSLBs delivers two times higher initial discharge capacity and an extra-long life of 2022 cycles of up to 4.2 V (vs Li–In) (with >70% capacity retention at 1 C). This research enriches the strategies for improving interfacial compatibility between LLO cathodes and sulfide SEs, thus providing new inspiration for guiding the application of LLO in sulfide ASSLBs.
研究领域:
材料科学
·
电化学
·
电池技术
·
固态电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Shuxian Zhang,Jianchao Chen,Chunyan Zhu,Qingyuan Liu,Qingyu Li,Renbo Liu,Xiaobo Jiang,Yijie Yan,Shengjian Sun,Longwei Yin,Rutao Wang
All-solid-state batteries (ASSBs) with a Li metal anode are expected to be one of the most promising energy storage systems to achieve high energy density. However, the interfacial instability between the Li metal anode and solid-state electrolyte (SSE) limits the rate capability and cycling stability of ASSBs. The main issue is the formation of voids at the Li/SSE interface during Li stripping due to the slow diffusion of Li within the bulk Li metal, then increasing internal cell resistance and inducing the formation of lithium dendrites. To address these issues, a composite Li anode (LAO) composed by Li–Ag alloy and Li2O is constructed by mixing the stoichiometric metal Li and Ag2O directly. LAO anode is capable of improving bulk Li diffusion kinetics and inhibiting the formation of interfacial voids effectively, achieving a high critical current density over 1.5 mA cm–2 and long stable cycling over 1000 h at 1 mA cm–2. The ASSBs, employing LAO as the anode, Li6PS5Cl as the SSE, and LiCoO2 as the cathode, exhibit superior rate capability and stable cycling over 4000 cycles at 5 C. Moreover, ASSBs can operate stably with a high LiCoO2 loading of 17.8 mg cm–2 for more than 100 cycles at 0.2 C.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）