材料科学
电解质
电池(电)
锂(药物)
化学工程
热稳定性
阴极
阳极
相间
功率密度
电极
热力学
功率(物理)
电气工程
化学
物理化学
物理
工程类
内分泌学
生物
医学
遗传学
作者
Hang Li,Zhipeng Wen,Dongzheng Wu,Weijie Ji,Zheng He,Feng Wang,Yang Yang,Peng Zhang,Jinbao Zhao
标识
DOI:10.1021/acsami.1c17209
摘要
Li metal batteries with high-capacity cathodes emerge as promising candidates for next-generation battery technologies. However, the poor reversibility of the Li deposition/stripping process severely reduces its lifespan, and safety also remains a major issue for the Li metal anodes. Herein, we propose (ethoxy)-penta-fluoro-cyclo-triphosphazene (DFA) as a dual-functional electrolyte additive to solve the engineering problem of balancing the cycle life and thermal stability of Li metal batteries. The NCM811/lithium metal pouch batteries (2900 mA h) are assembled using the commercial high areal capacity cathode (3.5 mA h cm-2). Compared with the NCM811/Li batteries without DFA, the heat generation and heat generation power of lithium metal batteries with DFA are significantly reduced by half during charging. Moreover, the NCM811/Li pouch batteries with DFA show excellent stability in both hot-oven and adiabatic rate calorimeter experiments. Furthermore, a nonlinear phase field simulation is carried out for mechanism investigation, which confirms that the stable solid electrolyte interphase formed by DFA will improve the cycle life of the NCM811/Li pouch. The DFA is verified to be an effective additive to improve the cycle stability and safety simultaneously, providing new opportunities for developing high energy density Li metal batteries.
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