期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 10, 页码 11336-11342出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02158
关键词
columnar Li deposition; dendrite-free; high CE; LiNO3-based electrolyte; N-rich SEI
资金
- National Natural Science Foundation of China [21773154, 21975158, U1705255]
- Program of Shanghai Academic Research Leader [20XD1401900]
- Key-Area Research and Development Program of Guangdong Province [2019B090908001]
This study successfully constructed dendrite-free columnar lithium deposition using LiNO3-based electrolyte, forming a nitrogen-rich inorganic SEI with excellent Li+ conductivity, enhancing the reversibility and Coulombic efficiency of the battery, resulting in outstanding cycling stability. This approach provides a new pathway for regulating columnar lithium deposition and developing electrolyte formulations for secondary lithium-metal batteries.
Rechargeable Li-metal anodes have received abundant attention for high-energy-density batteries. A solid electrolyte interphase ( SEI) plays a significant role in regulating the Li+ deposition/stripping process. Aimed to solve detrimental Li deposition with a dendritic and mossy morphology, herein, dendrite-free columnar Li deposition in micron size is constructed via creatively adopting a LiNO3-based electrolyte even at a high current density (2 mA cm(-2)) and areal capacity (4 mAh cm(-2)). N-rich inorganic SEI (Li3N and LiNxOy) with superior Li+ conductivity is formed on Li deposition, which enables remarkable reversibility and high average Coulombic efficiency (CE) even over 240 cycles. A Li parallel to LiFePO4 cell delivers excellent cycling stability over 700 cycles with a capacity fading rate of merely 0.022% per cycle. This work provides a way to regulating columnar Li deposition via N-rich SEI coordination and developing electrolyte formulations for secondary Li-metal batteries.
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