无机材料学报2022，Vol.37Issue(7)：802-808,7.DOI:10.15541/jim20220196
石榴石型Li6.4La3Zr1.4Ta0.6O12对Si/C负极表面固体电解质中间相的调控机制研究
Mechanism Study on Garnet-type Li6.4La3Zr1.4Ta0.6O12 Regulating the Solid Electrolyte Interphases of Si/C Anodes
摘要
Abstract
The large volume change of silicon anode leads to rupture of the solid electrolyte interface (SEI) and the pulverization of Si electrode during charge-discharge process, which results in uncontrolled capacity loss. In this work, a strategy to regulate the SEI composition of Si/C anodes utilizing Li6.4La3Zr1.4Ta0.6O12 (LLZTO) solid electrolyte was proposed. LLZTO layer is uniformly coated on the surface of polypropylene (PP) separator, which not only improves wettability of the electrolyte to the separator, thereby homogenizing the lithium-ion flux, but also increases the proportion of inorganic components in SEI and enhances the interfacial stability of Si/C anodes. As a result, Li batteries using the LLZTO coated PP separator exhibit better cycling stability and rate capability. Li-Si/C half cell exhibits a reversible capacity of 876 mAh·g–1 with 81％ capacity retention for more than 200 cycles at 0.3C (1C=1.5 A·g–1), and Si/C-LiFePO4 (LFP) full cell delivers a capacity of 125 mAh·g–1 with 91.8％ capacity retention after 100 cycles at 0.3C (1C=170 mA·g–1). This work reveals the mechanism of LLZTO solid electrolytes in regulating the SEI of Si/C anodes and sparks new ideas for developing high-performance silicon-based lithium batteries.关键词
固体电解质中间相/成分调控/石榴石型固体电解质/Si/C负极/锂离子电池Key words
solid electrolyte interphase/composition regulation/garnet-type solid electrolyte/Si/C anode/lithium-ion battery分类
信息技术与安全科学引用本文复制引用
苏东良,崔锦,翟朋博,郭向欣..石榴石型Li6.4La3Zr1.4Ta0.6O12对Si/C负极表面固体电解质中间相的调控机制研究[J].无机材料学报,2022,37(7):802-808,7.基金项目
National Natural Science Foundation of China(U1932205) （U1932205）
Key R&D Program of Shandong Province(2021CXGC010401) （2021CXGC010401）
Taishan Scholars Program(ts201712035) （ts201712035）
Project of Qingdao Leading Talents in Entrepreneurship and Innovation （）
