电解质
材料科学
阴极
法拉第效率
电池(电)
金属锂
储能
电镀(地质)
电极
化学工程
金属
冶金
化学
物理
地质学
工程类
量子力学
物理化学
功率(物理)
地球物理学
作者
Weimin Xue,Mingjun Huang,Yutao Li,Yun Zhu,Rui Gao,Xianghui Xiao,Wenxu Zhang,Sipei Li,Guiyin Xu,Yang Shao‐Horn,Peng Li,Jeffrey Lopez,Daiwei Yu,Yanhao Dong,Weiwei Fan,Zhe Shi,Rui Xiong,Cheng‐Jun Sun,Inhui Hwang,Wah-Keat Lee,Yang Shao‐Horn,Jeremiah A. Johnson,Ju Li
出处
期刊:Nature Energy
[Springer Nature]
日期:2021-03-25
卷期号:6 (5): 495-505
被引量:388
标识
DOI:10.1038/s41560-021-00792-y
摘要
By increasing the charging voltage, a cell specific energy of >400 W h kg−1 is achievable with LiNi0.8Mn0.1Co0.1O2 in Li metal batteries. However, stable cycling of high-nickel cathodes at ultra-high voltages is extremely challenging. Here we report that a rationally designed sulfonamide-based electrolyte enables stable cycling of commercial LiNi0.8Co0.1Mn0.1O2 with a cut-off voltage up to 4.7 V in Li metal batteries. In contrast to commercial carbonate electrolytes, the electrolyte not only suppresses side reactions, stress-corrosion cracking, transition-metal dissolution and impedance growth on the cathode side, but also enables highly reversible Li metal stripping and plating leading to a compact morphology and low pulverization. Our lithium-metal battery delivers a specific capacity >230 mA h g−1 and an average Coulombic efficiency >99.65% over 100 cycles. Even under harsh testing conditions, the 4.7 V lithium-metal battery can retain >88% capacity for 90 cycles, advancing practical lithium-metal batteries. Charging at high voltages in principle makes batteries energy dense, but this is often achieved at the cost of the cycling stability. Here the authors design a sulfonamide-based electrolyte to enable a Li metal battery with a state-of-the-art cathode at an ultra-high voltage of 4.7 V while maintaining cyclability.
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