Journal
ADVANCED SCIENCE
Volume 9, Issue 28, Pages -Publisher
WILEY
DOI: 10.1002/advs.202203216
Keywords
dense plating; stripping process; electrolyte concentration; lithium metal batteries; pouch cell; solid electrolyte interphase
Categories
Funding
- National Natural Science Foundation of China [20A20145, 21878195, 21805198]
- Distinguished Young Foundation of Sichuan Province [2020JDJQ0027]
- Sichuan University [2020CDZG-09]
- Zigong Municipal People's Government [2020CDZG-09]
- State Key Laboratory of Polymer Materials Engineering [sklpme2020-3-02]
- Sichuan Provincial Department of Science and Technology [2020YFG0471, 2020YFG0022]
- Sichuan Province Science and Technology Achievement Transfer and Transformation Project [21ZHSF0111]
- Sichuan University Postdoctoral Interdisciplinary Innovation Fund [2021SCU12084]
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This study achieves a LiF-rich SEI and a uniform and dense plating/stripping process by reducing the electrolyte concentration without changing the solvation structure, thereby enhancing the cycling stability of lithium-metal batteries.
The interface structure of the electrode is closely related to the electrochemical performance of lithium-metal batteries (LMBs). In particular, a high-quality solid electrode interface (SEI) and uniform, dense lithium plating/stripping processes play a key role in achieving stable LMBs. Herein, a LiF-rich SEI and a uniform and dense plating/stripping process of the electrolyte by reducing the electrolyte concentration without changing the solvation structure, thereby avoiding the high cost and poor wetting properties of high-concentration electrolytes are achieved. The ultra-low concentration electrolyte with an unchanged Li+ solvation structure can restrain the inhomogeneous diffusion flux of Li+, thereby achieving more uniform lithium deposition and stripping processes while maintaining a LiF-rich SEI. The LiIICu battery with this electrolyte exhibits enhanced cycling stability for 1000 cycles with a coulombic efficiency of 99% at 1 mA cm(-2) and 1 mAh cm(-2). For the LiIILiFePO4 pouch cell, the capacity retention values at 0.5 and 1 C are 98.6% and 91.4%, respectively. This study offers a new perspective for the commercial application of low-cost electrolytes with ultra-low concentrations and high concentration effects.
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