Achieving Uniform Li Deposition and Suppressed Electrolyte Flammability in Li ‐Metal Batteries via Designing Localized High‐Concentration Electrolytes

This study introduces a localized high-concentration electrolyte (LHCE) that addresses these issues by employing non-flammable electrolyte components and incorporating carefully designed additives to enhance flame retardancy and low-temperature performance. By incorporating additives to optimize the electrolyte, it is possible to attain inorganic-dominated solid electrolyte interphases on both the cathode and anode. This achievement re sults in a uniform deposition of lithium, as well as the suppression of electrolyte decomposition and cathode deterioration. Consequently, this LHCE achieve over 300 stable cycles for both LiNi0.9Mn0.05Co0.05O2||Li cells and LiCoO2||Li cells, as well as 50 cycles for LiNi0.8Mn0.1Co0.1O2 (NCM811||Li) pouch cells. Furthermore, NCM811||Li cells maintain 84% discharge capacity at −20 °C, in comparison to the capacity at room temperature. The utilization of this electrolyte presents novel perspectives for the safe implementation of LMBs.

Source: Small - May 9, 2024 Category: Nanotechnology Authors: Xingkai Wang, He Huang, Hong Zhang, Qiujiang Dong, Wanxing Zhang, Meng Gao, Jinyang Li, Biao Chen, Hao Guo, Xiaopeng Han Tags: Research Article Source Type: research