IONICS
·
2022
·Vol. 29
·期 3
·1003-1011
·
IF 2.961
Jiang Guanghui,Liu Lei,Fei Zitong,Meng Qi,Zhang Yingjie,Dong Peng,Ouyang Quansheng,Ke Ding,Wang Jiqun,Yang Anqi
The large-scale lithium-ion batteries (LIBs) have begun to retire, and their disposal and reuse is a challenge. Herein, a regenerative and coating synergistic strategy is adopted to achieve the Li 3 PO 4 -coated and regeneration of LiNi 0.5 Co 0.2 Mn 0.3 O 2 material. The temperature was confirmed great influence to regenerate. The sample of 850 °C has the best cycle performance and rate performance, and the capacity retention rate is more than 80% after 100 cycles at 1 C. The recovery of material properties is due to structural repair and Li 3 PO 4 coating. The coating and regeneration strategy can be applied to the regeneration of other cathode materials and provides guidance for the treatment and reuse of waste LIBs electrolyte.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaotong Liu,Qiang Weng,Tao Liu,Zhiyuan Tang,Haoqing Tang
Li 2 ZnTi 3 O 8 (LZTO) has been highlighted as a promising active anode material for rechargeable lithium-ion batteries, but it suffers from a low high-rate capacity due to the sluggish Li-ion diffusion kinetics and inevitable consumption of Li + due to side reactions at the electrode/electrolyte interface. In this study, using Li 3 PO 4 as a lithium ion conductor and interface modifier, the crystal structure and electrochemical properties of LZTO are systematically studied and confirm that it is a faster lithium ion conductivity. Li 3 PO 4 not only accelerates Li-ion transport and increases diffusion paths, but also exhibits interfacial stability at high temperatures. Due to these advantages, the LZTO electrode containing the Li 3 PO 4 coating layer exhibits significantly improved electrochemical performance. The new Li 3 PO 4 coated LZTO electrode shows a large discharge specific capacity of 158.9 mAh g − 1 and a high capacity retention of 99% is obtained after 200 cycles at a rate of 5.0 A g − 1 and combined with cycle stability. Furthermore, the Li 3 PO 4 coated LZTO electrode also exhibits excellent low electrode polarization and high temperature long cycling performance for 500 cycles at temperatures up to 70 °C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Jing Wang,Youlong Xu,Yao Niu,Yali Liu,Xianghua Yao
A critical challenge in the commercialization of spinel lithium manganate materials is the bulk structure damage and capacity degradation due to manganese dissolution during battery operation. Hence, Li3PO4 with good ionic conductivity was homogeneously deposited on the surface of spinel lithium manganate by the sol–gel method, aiming to improve the stability and cycling of the spinel structure by an epitaxial layer. The structural and electrochemical characterizations reveal that the presence of the Li3PO4 epitaxial coating prevents the direct contact of the cathode surface and electrolyte, thus enhancing the stability of the structure and reducing the extent of manganese dissolution. Further studies have shown that the contribution of the Li3PO4 layer promotes the diffusion coefficient of lithium ions, which increases from 7.89 × 10–12 to 4.43 × 10–11 cm2 s–1. Meanwhile, the Li3PO4 coating regulates the concentration of oxygen vacancies on the surface of the spinel, effectively reducing the transfer resistance and increasing the electronic conductivity to 3.50 × 10–5 cm–1. Specifically, the discharge specific capacity of the 1.0 wt % Li3PO4-modified electrode is still 115.4 mAh g–1 after 300 cycles, with the capacity retention increased to 90.8%. Even at a high rate of 10C, it still demonstrates excellent rate capability, with the discharge specific capacity more elevated than that of the unmodified material at about 40 mAh g–1. This strategy can simultaneously solve the interfacial instability and bulk structure degradation, thus improving the electrochemical performance of lithium manganate materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tianci Cao,Xiaopeng Cheng,Mingming Wang,Junxia Lu,Jiajia Niu,Huan Liu,Xianqiang Liu,Yuefei Zhang
Lithium (Li) metal is a promising candidate for next-generation anode materials with high energy densities. However, Li dissolution/deposition processes are limited at the upper surface in contact with the electrolyte, which brings a locally high current density and then results in dendritic Li growth. This restraint of the local surface reaction during cycling has not been solved by commonly used modification strategies. In this study, a three-dimensional (3D) Li+ conductive skeleton is activated from atomic layer deposition (ALD) coating Li3PO4 (LPO) on the surface of the Ni foam (LPNF). Then, the skeleton is efficiently constructed in the Li metal anode by the lower-temperature Li infusion. Ionic conductor LPO layers and electronic conductor Ni fibers supply charge transport channels between the electrolyte and the internal Li. The mixed conductive network realizes holistic charge transfer, which is proved by in situ scanning electron microscopy experiments. In virtue of dispersive dissolution/deposition and optimized electrochemical kinetics brought by a Li+ conductive network, the composited Li electrode presents an excellent symmetric battery cycling stability (over 1200 h) and enhanced rate performances (stable cycling even at 10.0 mA cm–2). When matching with a LiCoO2 (LCO) cathode, LCO||Li@LPNF full batteries exhibit a capacity retention of 80.8% over 250 cycles. During cycling, there was no evidence of dendrite growth and the remaining Li in the composited anode showed a smooth, compact, and well-combined condition with LPNF. Through constructing a 3D Li+ conductive network, the composited Li metal anode breaks through the limit of the local surface reaction; this work proposes a novel insight of realizing holistic charging/discharging for the dendrite-free Li metal anode.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）