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首页> 外文期刊>Advanced energy materials >Optimized Cycle and Safety Performance of Lithium–Metal Batteries with the Sustained-Release Effect of Nano CaCO_3
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Optimized Cycle and Safety Performance of Lithium–Metal Batteries with the Sustained-Release Effect of Nano CaCO_3

机译：Optimized Cycle and Safety Performance of Lithium–Metal Batteries with the Sustained-Release Effect of Nano CaCO_3

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摘要

The capacity attenuation and poor safety caused by lithium dendrite and interface side reactions have hindered the application of lithium-metal batteries (LMBs) for a long time. To solve this problem, some liquid or salt additives have been added to the electrolyte to promote the uniform stripping/plating of lithium, however, the consumption of electrolyte during cycles reduces the concentration of active components, resulting in the gradual failure of additives. Herein, a new solid additive (nano CaCO3) working under the principle of sustained release is proposed: the homo-dispersed nano CaCO3 particles can continuously absorb the decomposition by-products generated during the side reaction and release Ca2+, which cannot only inhibit the tip deposition of Li+ through electrostatic shielding effect but also effectively promote the formation of stable F-rich solid-electrolyte interphase (SEI). As the consequence, a notably optimized electrochemical performance for commercial carbonate electrolyte after adding 3 wt. nano CaCO3 is observed, and the cycle life of symmetric LiLi cells is extended from 400 h to over 800 h at 1 mA cm(-2). In addition, the modified emulsion-like electrolyte has lower volatility and its protective effect on the separator is confirmed by ex situ optical observation, reflecting the safety improvement of LMBs.

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