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The Journal of Physical Chemistry Letters

The Journal of Physical Chemistry Letters

IF: 4.79
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Exploring Trimethyl-Phosphate-Based Electrolytes without a Carbonyl Group for Li-Rich Layered Oxide Positive Electrodes in Lithium-Ion Batteries

Published:1 December 2022 DOI: 10.1021/acs.jpclett.2c02585 PMID: 36453838
Zezhao Liu, Zhishan Liu, Kuihao Li, Xinzhe Zhao, Mingming Chen, He Miao and Lan Xia*, 

Abstract

Li-rich layered oxides (LLOs) are one of the most attractive next-generation positive electrode materials as a result of their high energy density and low cost. However, the deterioration of cycling stability observed in LLOs remains one of the fundamental obstacles to commercialization. Carbonate-based electrolytes reacting with oxygen radicals evolved from the lattice of LLOs is the chief cause of their poor cyclability. Herein, we construct no carbonyl group, trimethyl phosphate (TMP)-based electrolytes with a fluorinated ether co-solvent and apply them to investigate the electrochemical behaviors of LLO batteries. These electrolytes can capture active oxygen species; the initial reversible capacity of cells reaches 295.5 mAh g–1; and the capacity retention remains 96.7% after 100 cycles. In contrast, the capacity retention of cells using carbonate-based electrolytes is only 54.7% after 60 cycles. These results would provide the scientific basis and theoretical support for building electrolytes of LLOs with high properties in the future.

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Trimethyl phosphate 512-56-1 C3H9O4P 541 suppliers $10.00-$818.61

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