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Ultra-high-voltage Ni-rich layered cathodes in practical Li metal batteries enabled by a sulfonamide-based electrolyte

Authors :
Yanhao Dong
Zhe Shi
Jeremiah A. Johnson
Rui Xiong
Cheng-Jun Sun
Rui Gao
Yang Shao-Horn
Guiyin Xu
Weiwei Fan
Sipei Li
Inhui Hwang
Peng Li
Yang Yu
Mingjun Huang
Yutao Li
Ju Li
Xianghui Xiao
Daiwei Yu
Yun Guang Zhu
Jeffrey Lopez
Weijiang Xue
Wah-Keat Lee
Wenxu Zhang
Source :
Nature Energy. 6:495-505
Publication Year :
2021
Publisher :
Springer Science and Business Media LLC, 2021.

Abstract

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.

Details

ISSN :
20587546
Volume :
6
Database :
OpenAIRE
Journal :
Nature Energy
Accession number :
edsair.doi...........168a2949013bca8f39bcedddcc9c92ff