期刊
NANO ENERGY
卷 87, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106212
关键词
Charge redistribution; Li dendrite; Interfacial Li+ flux; Li metal anode
类别
资金
- National Key Research and Development Program of China [2017YFB0102000]
- National Science Foundation of China [52074539]
- Science and Technology Innovation Program of Hunan Province [2020RC4005, 2019RS1004]
The interconnected Li3P@Cu ion/electron conductive interlayer efficiently constructed on the Li foil surface enables charge redistribution, improves electrochemical kinetics, and promotes the reversibility of Li plating/stripping processes.
Li metal is the ultimate anode material for Li based battery with high energy density. However, inhomogeneous charge distribution from the unbalanced ion/electron transport is usually generated at the electrode surface, leading to the uncontrollable dendrites with poor reversibility. Herein, interconnected Li3P@Cu ion/electron conductive interlayer activated from interfacial reaction between Cu3P arrays and metallic Li is efficiently constructed on Li foil surface through room-temperature mechanical rolling process for charge redistribution. Demonstrated by theoretic calculation, the diffusion barrier of Li+ is remarkably reduced from Li3P interphase with high ionic conductivity, while the electron-conductive Cu domains ensures well-dispersed current density, facilitating the uniform distribution of interfacial Li+ flux. Furthermore, the interconnected skeletons with extensive active channels significantly enhances the electrochemical kinetics and promotes the reversibility of Li plating/stripping processes. As expected, a prolonged lifespan of symmetrical cells over 1500 h with lower polarization is successfully achieved at 1 mA cm(-2), further improving the rates and cycling performances of LiFePO4 based full cells in mass loading of 8.5 mg cm(-2) with a capacity retention up to 91.7% after 300 cycles. This work proposed a rational interlayer design for interfacial charge redistribution and presents an efficient strategy to realize dendrite-free Li metal anode.
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