所有固态电池具有软碳-TiSi多层结构,用于优化LiSi阳极.
Qian Li1,2, WeiTao He3,4, MuChun Li3,4
1Tianmu Lake Institute of Advanced Energy Storage Technologies, Liyang, Jiangsu, 213300, China.
Advanced materials (Deerfield Beach, Fla.)
|October 14, 2025
概括
一种新型的三层阳极 (Si-TiSi2-LPSCl/软碳/Li) 通过防止树突和容量衰减来增强全固态电池 (ASSB). 这种设计使下一代ASSB的超长循环寿命和高能量密度成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 金属和阳极对于高能量密度全固态电池 (ASSB) 来说至关重要.
- 树的生长和体积的扩张导致短路和容量衰减,阻碍了ASSB应用.
- 需要先进的阳极设计来克服ASSB中的这些局限性.
研究的目的:
- 设计和研究用于ASSB的新型三层结构阳极.
- 为了应对在ASSB中树增长和体积扩张的挑战.
- 提高ASSB的电化学性能和循环寿命.
主要方法:
- 制造一个Si-TiSi2-LPSCl/软碳/Li (ST5-SC-Li) 三层结构阳极.
- 利用TiSi2作为刚性支和LPSCl作为塑料变形来控制膨胀.
- 构建一个离子-电子双网络,以提高导电性和离子传输.
- 采用柔软的碳 (SC) 层来吸收压力并抑制树的透.
- 采用金属层来动态补偿不可逆转的容量损失.
主要成果:
- ST5-SC-Li阳极有效地限制了异型的膨胀,并减轻了体积变化.
- 形成了一个连续的离子通道和离子-电子双网络,改善导电性.
- 柔软的碳层成功地吸收了膨胀应力,并抑制了树岩的透.
- LCO/LPSCl/ST5-SC-Li ASSB在10°C下表现出超长的周期寿命,为64,000个周期,容量保留>100%.
- 在高负载下在0.1C时,达到19.6 mAh cm-2的高可逆面积容量.
结论:
- 开发的三层结构性阳极显著提高了ASSB的稳定性和性能.
- 多层设计有效地抑制了树突和体积膨胀.
- 这种阳极架构为实现高能量密度和长寿命的ASSB提供了一个有希望的途径.
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