电解质
电化学
氧化物
锂(药物)
材料科学
氧气
磷酸三甲酯
溶剂
化学工程
电极
无机化学
磷酸盐
碳酸盐
化学
有机化学
冶金
物理化学
内分泌学
工程类
医学
作者
Zezhao Liu,Zhishan Liu,Kuihao Li,Xin Zhao,Mingming Chen,He Miao,Lan Xia
标识
DOI:10.1021/acs.jpclett.2c02585
摘要
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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