期刊
SMALL
卷 17, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202007717
关键词
composite separators; dendrite‐ free lithium deposition; lithium metal anodes; polyacrylate acid; silicon monoxide
类别
资金
- National Natural Science Foundation of China [51972198]
- Taishan Scholars Program of Shandong Province [tsqn201812002, ts20190908]
- Young Scholars Program of Shandong University [2016WLJH03]
- State Key Program of National Natural Science of China [61633015]
- Project of the Taishan Scholar [ts201511004]
- Shenzhen Fundamental Research Program [JCYJ20190807093405503]
- Natural Science Foundation of Shandong Province [ZR2020JQ19]
The development of a protective layer composed of lithiated SiO and polyacrylate acid on the Li metal anode enables dendrite-free Li deposition, leading to enhanced cycling stability and coulombic efficiency in Li||Li and Cu||Li cells. This technology also significantly extends the lifespan of full cells with a composite separator in carbonate-based electrolytes.
As a promising candidate for the high energy density cells, the practical application of lithium-metal batteries (LMBs) is still extremely hindered by the uncontrolled growth of lithium (Li) dendrites. Herein, a facile strategy is developed that enables dendrite-free Li deposition by coating highly-lithiophilic amorphous SiO microparticles combined with high-binding polyacrylate acid (SiO@PAA) on polyethylene separators. A lithiated SiO and PAA (lithiated-SiO/PAA) protective layer with synergistic flexible and robust features is formed on the Li metal anode via the in situ reaction to offer outstanding interfacial stability during long-term cycles. By suppressing the formation of dead Li and random Li deposition, reducing the side reaction, and buffering the volume changes during the lithium deposition and dissolution, such a protective layer realizes a dendrite-free morphology of Li metal anode. Furthermore, sufficient ionic conductivity, uniform lithium-ion flux, and interface adaptability is guaranteed by the lithiated-SiO and Li polyacrylate acid. As a result, Li metal anodes display significantly enhanced cycling stability and coulombic efficiency in Li||Li and Cu||Li cells. When the composite separator is applied in a full cell with a carbonate-based electrolyte and LiNi0.8Mn0.1Co0.1O2 cathode, it exhibits three times longer lifespan than control cell at current density of 5 C.
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