使用固体溶液/合金复合阳极的应力-应变工程,用于稳定的金属电池
Junjie Fu1, Xiancheng Wang1, Xiangrui Duan1
1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|September 23, 2025
概括
研究人员开发了一种新的双相-银/22tin5复合阳极,以提高金属电池的稳定性. 这种设计减轻了体积膨胀和应力,使电池寿命更长.
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:
- 高能量密度的金属电池需要稳定的阳极,但电化学-机械不稳定性导致由于不受控制的和应力而导致快速故障.
- 涂层会导致电极胀,副作用和多孔沉积,显著降低电池性能.
研究的目的:
- 为了研究合应力,应变和体积变化在金属阳极循环过程中.
- 设计一种稳定的复合阳极,以解决金属的电化学-机械不稳定性.
主要方法:
- 在现场调查应力,应变及其在充/放电循环期间的空间分布.
- 开发一个双相Li-Ag固体溶液/Li22Sn5合金复合阳极.
- 电化学性能测试NCM622底管Li-Ag/Li22Sn5袋式电池与NCM622底管Li电池相比.
主要成果:
- -Ag/Li22Sn5复合阳极表现出增强的+亲和力,用于均的涂层和刚性支架,以限制体积膨胀.
- 在循环中,NCM622玉米Li-Ag/Li22Sn5囊细胞与NCM622玉米Li细胞相比,表现出明显较低的内部压力升高 (在第5个循环中压力升高减少了58%).
- 一个1.3Ah层袋式电池在100个周期内保持了87%的容量,在行业相关的N/P比率和电解质预算下.
结论:
- 了解机械电化学合对于设计稳定的金属阳极至关重要.
- 双相Li-Ag/Li22Sn5复合阳极为实现长寿命,高能量密度金属电池提供了一种实用方法.
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