降低电气和增加离子导电支架,用于长寿命,高速率和深容量金属阳极
Chuanfa Li1, Jiaqi Wang1, Qian Ye1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|April 11, 2024
概括
研究人员开发了新的3D支架来控制 (Li) 金属阳极,从而实现稳定,无树的Li沉积. 这一突破确保了下一代金属电池的安全,持久的性能.
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:
- (Li) 金属电池具有高能量密度,但面临着阳极状物生长和体积变化的挑战.
- 现有的3D支架通常会由于高电导率和较差的离子传输,促进不均的"顶部生长".
研究的目的:
- 为了设计3D支架,促进统一的,自下而上的沉积,以获得无树的金属阳极.
- 为了提高金属电池的安全性和循环寿命.
主要方法:
- 设计了具有降低电导率和增强离子导率的3D支架.
- 使用这些支架,研究了对称细胞中的涂/剥离行为.
- 在苛刻的条件下测试完整电池,包括高阴极负载和低电解质比率.
主要成果:
- 实现了受控的自下而上化,防止了树突的形成.
- 在3 mA cm-2.2的对称细胞中,经过11000多个小时的超稳定涂/剥离.
- 在具有挑战性的操作参数下,在全细胞中展示了高循环稳定性.
结论:
- 经过修改的3D支架有效调节沉积,使得无石涂层成为可能,并显著提高了电池的稳定性.
- 这种方法代表了安全和高性能金属电池的实际应用的关键进步.
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