Abstract
Lithium metal battery (LMB) is a potential next-generation battery for higher energy storage device than state-of-the-art lithium-ion batteries. To obtain a high energy density of LMB, high mass loading of high-capacity cathode such as high-nickel LiNixCoyMnzO2 (NCM, x ≥ 0.8) and/or high-voltage operation (> 4.2 V) are needed. The inherent issues of LMBs at high-voltage are interface and thermal instability and structural degradation of NCM cathode. Moreover, the uncontrollable growth of lithium (Li) dendrites at Li anode often occur when using traditional carbonate-based flammable liquid electrolyte, resulting in the risk of battery safety. A suggested solution to mitigate those issues is the development of a less flammable liquid electrolyte that also forms stable solid electrolyte interphase (SEI) at the surface of cathode and anode. Herein, we report a flame-retarding electrolyte approach that enables the stable operation of a high-nickel NCM-based LMB under high voltage and high temperature.
Published Version
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