期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 12, 期 7, 页码 2174-2184出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ee00716d
关键词
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资金
- National Research Foundation of Korea (NRF) - Korea government Ministry of Education and Science Technology (MEST) [NRF-2018R1A2B3008794]
- Human Resources Development programme of a Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Ministry of Trade, Industry and Energy of the Korean government [20184010201720]
We propose a new breakthrough in realizing a practical Li-metal battery (LMB) capable of fast charging while delivering a high energy density. We used an electrolyte consisting of 1 M LiPF6 and 0.05 M lithium difluoro(oxalate)borate dissolved in a mixture of ethyl methyl carbonate and fluoroethylene carbonate to ensure the formation of a stable and robust solid electrolyte interphase (SEI) layer on the anode surface. Pretreatment of the Li-metal anode with LiNO3 adds a prior Li2O-rich SEI layer that provides the required mechanical strength to prevent premature SEI layer breakdown. An Al-doped full-concentration-gradient Li[Ni0.75Co0.10Mn0.15]O-2 cathode provides the necessary cycling stability at a high cathode loading. By integrating these components, we produced an LMB that allowed a high areal capacity of 4.1 mA h cm(-2) with an unprecedented cycling stability over 300 cycles at a high current density of 3.6 mA cm(-2) (full charge-discharge in 2 h). We believe that the findings presented herein provide new perspectives for the development of practical LMBs that satisfy the capacity and charging rate requirements for future electric vehicles.
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