键增强铁电极化使得高速率能力金属电池成为可能
Wenran Wang1, Li Ma1, Baolei Xu1
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|September 2, 2023
概括
一个新的策略使用极化铁电涂层来防止金属电池 (LMB) 中的树生长. 这提高了电池性能和安全性,用于下一代能源存储.
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:
- 金属阳极具有高容量,但受到状物生长和性能降低的影响.
- 树突生长和死形成限制了金属电池 (LMB) 的实际应用.
- 现有的方法难以确保统一的沉积和剥离,影响电池寿命和安全性.
研究的目的:
- 开发一种通用策略,用于在阳极电流收集器上在现场形成极化铁电涂层.
- 为了研究来自铁电涂层的局部电场对离子行为的影响.
- 为了提高金属电池的电化学性能和安全性.
主要方法:
- 一种由键诱导的方法,以创建一个极化铁电聚乙烯化物 (PVDF) 涂层.
- 使用涂层电流收集器制造对称的电池和带有 LiFePO4 阴极的全电池.
- 电化学测试,包括在各种电流密度下循环寿命和速率性能评估.
主要成果:
- 极化PVDF涂层有效地促进了统一的沉积和剥离,即使在高速率.
- 对称的电池证明了在2 mA cm−2的电压极化最小的情况下超过900小时的循环寿命.
- 实现了高达8.85mA cm-2的超高速率性能,并且全细胞显示了增强的电化学特性.
结论:
- 铁电极化策略为金属电池的接口工程提供了一种新的方法.
- 这种方法成功地减轻了树的生长,并提高了LMB的整体电化学性能和安全性.
- 这些发现为高性能金属电池的大规模应用提供了有希望的途径.
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