| Institution: | 1. CAS Key Laboratory of Molecular Nanostructure and Nanotechnol-ogy, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), No.2 Zhongguancun North First Street, 100190 Beijing, P. R. China
University of Chinese Academy of Sciences, No.19(A) Yuquan Road, 100049 Beijing, P. R. China;2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, No. 8 Zhongguancun South Third Street, 100190 Beijing, P. R. China;3. CAS Key Laboratory of Molecular Nanostructure and Nanotechnol-ogy, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), No.2 Zhongguancun North First Street, 100190 Beijing, P. R. China;4. Beijing Frontier Research Center on Clean Energy, Huairou Division, Institute of Physics, Chinese Academy of Sciences, Yongle North Second Street, Yanqi Economic Development Zone, Huairou District, 101400 Beijing, P. R. China |
| Abstract: | Halide solid electrolytes, known for their high ionic conductivity at room temperature and good oxidative stability, face notable challenges in all–solid–state Li–ion batteries (ASSBs), especially with unstable cathode/solid electrolyte (SE) interface and increasing interfacial resistance during cycling. In this work, we have developed an Al3+–doped, cation–disordered epitaxial nanolayer on the LiCoO2 surface by reacting it with an artificially constructed AlPO4 nanoshell; this lithium–deficient layer featuring a rock–salt–like phase effectively suppresses oxidative decomposition of Li3InCl6 electrolyte and stabilizes the cathode/SE interface at 4.5 V. The ASSBs with the halide electrolyte Li3InCl6 and a high–loading LiCoO2 cathode demonstrated high discharge capacity and long cycling life from 3 to 4.5 V. Our findings emphasize the importance of specialized cathode surface modification in preventing SE degradation and achieving stable cycling of halide–based ASSBs at high voltages. |
