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Organosulfur Compounds Enable Uniform Lithium Plating and Long-Term Battery Cycling Stability
journal contribution
posted on 2020-03-13, 17:40 authored by Bismark Boateng, Yupei Han, Cheng Zhen, Guangfeng Zeng, Ning Chen, Dongjiang Chen, Chao Feng, Jiecai Han, Jie Xiong, Xiangfeng Duan, Weidong HeLithium
metal represents an ultimate anode material of lithium
batteries for its high energy density. However, its large negative
redox potential and reactive nature can trigger electrolyte decomposition
and dendrite formation, causing unstable cycling and short circuit
of batteries. Herein, we engineer a resilient solid electrolyte interphase
on the Li anode by compositing the battery separator with organosulfur
compounds and inorganic salts from garlic. These compounds take part
in battery reactions to suppress dendrite growth through reversible
electrochemistry and attenuate ionic concentration gradient. When
the Li anode and the separator are paired with the LiFePO4 cathode, one obtains a battery delivering long-term cycling stability
of 3000 cycles, a rate capacity of 100 mAh g–1 at
10 C (2.5 mA cm–2), a Coulombic efficiency of 99.9%,
and a low battery polarization. Additionally, with high-loading 20
mg cm–2 LiFePO4 cathodes, an areal capacity
of 3.4 mAh cm–2 is achieved at 0.3 C (1 mA cm–2).