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在现场通过双反应策略进行固体电解质接口,用于高度可逆的阳极
Peiwen Xu1,2, Mi Xu1,2, Jie Zhang1,2
1Power Battery & Systems Research Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, P. R. China.
Angewandte Chemie (International ed. in English)
|July 12, 2024
概括
一个新的双反应策略为阳极创建了一个保护性固体电解质接口 (SEI). 这种先进的SEI可以在高电流密度下实现稳定的循环,这对于实际的离子电池至关重要.
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:
- 固体电解质接口 (SEI) 的现场施工对于提高 (Zn) 阳极可逆性至关重要.
- 在高电流密度下 (≥20 mA cm−2) 实现高可逆性,对于现场SEI仍然是一个重大挑战.
研究的目的:
- 为高性能阳极开发一个新的现场SEI施工策略.
- 研究SEI在不同电流密度下作为"增长绑定器"和"导向调节器"的双重作用.
主要方法:
- 为了形成SEI,采用了一种涉及自发静电反应和电化学分解的双反应策略.
- 标志着SEI的多层结构 (有机丰富的上层,有机丰富的内部).
- 使用 Zn//Zn 对称细胞和 Zn//PANI 囊细胞来评估性能.
主要成果:
- 在现场的SEI表现出了特殊的稳定性和可逆性,在50 mA cm−2下循环超过1300小时,在100 mA cm−2下循环超过400小时.
- 创纪录的累计容量达到了67.5Ah cm-2.
- 观察到有效抑制副作用和树生长.
- 在高质量负载 (25.48 mg cm−2) 的囊细胞中验证了实用性.
结论:
- 拟议的双反应策略成功地为阳极构建了一个强大的,层层的现场SEI.
- 这种先进的SEI在高电流密度下显著提高了可逆性和稳定性,解决了离子电池的一个关键挑战.
- 这些发现为设计下一代SEI层用于实际储能应用提供了一种通用方法.
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