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Low concentration electrolyte with non-solvating cosolvent enabling high-voltage lithium metal batteries.


ABSTRACT: Developing low cost, yet high-voltage electrolyte is significant to improve the energy density and practicability of lithium metal batteries (LMBs). Low concentration electrolyte has significant merits in terms of cost and viscosity; however, their poor compatibility with high-voltage LMBs hinders its applications. Here, we develop a diluted low concentration electrolyte by replacing solvating cosolvent with a non-solvating cosolvent to facilitate the interaction between BF4 - and Li+, resulting in optimized interfacial chemistry and suppressed side reaction. Thus, the high-loading Li-LiCoO2 full cells (20.4 mg cm-2) deliver outstanding cycling stability and rate performance at a cutoff voltage of 4.6 V. More impressively, a Li-LiCoO2 pouch cell achieves an energy density of more than 400 Wh kg-1 under practical conditions with thin Li (50 μm) and lean electrolyte (2.7 g Ah-1). This work provides a rational approach to design a low concentration electrolyte, which can be extended to other high voltage battery systems.

SUBMITTER: Jiang Z 

PROVIDER: S-EPMC8715189 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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Low concentration electrolyte with non-solvating cosolvent enabling high-voltage lithium metal batteries.

Jiang Zhipeng Z   Zeng Ziqi Z   Zhang Han H   Yang Li L   Hu Wei W   Liang Xinmiao X   Feng Jiwen J   Yu Chuang C   Cheng Shijie S   Xie Jia J  

iScience 20211201 1


Developing low cost, yet high-voltage electrolyte is significant to improve the energy density and practicability of lithium metal batteries (LMBs). Low concentration electrolyte has significant merits in terms of cost and viscosity; however, their poor compatibility with high-voltage LMBs hinders its applications. Here, we develop a diluted low concentration electrolyte by replacing solvating cosolvent with a non-solvating cosolvent to facilitate the interaction between BF<sub>4</sub> <sup>-</s  ...[more]

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