混合动力共价网络为稳定的金属电池提供基于保护层
Hao Feng1, Yayue He1, Mengxiang Ma1
1Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.
ACS applied materials & interfaces
|February 28, 2024
概括
一个新的混合聚合物网络保护金属阳极,防止树的生长,提高电池循环寿命. 这一突破使得更安全,更持久的储能解决方案成为可能.
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
- 聚合物化学 聚合物化学
背景情况:
- 金属 (Li) 是一个有前途的阳极材料,用于高容量储能.
- 挑战包括树的生长和不稳定的固体电解质间相 (SEI) 层.
- 开发保护层对于商业化金属电池至关重要.
研究的目的:
- 开发混合共价适应性聚合物网络 (HCAPN) 作为金属阳极的保护层.
- 调查HCAPN的特性,包括机械强度,溶剂耐受性和自我愈合能力.
- 为了评估使用HCAPN保护层的金属电池的电化学性能.
主要方法:
- 通过共聚合和与聚乙烯胺 (PEI) 和胺基改性二氧化 (SiO2) 交叉链接合成HCAPN.
- 在聚合物组件之间形成动态共价键 (乙烯基同质尿).
- 组装的对称和完整的电池电池 (HCAPN@Li ngaturang ngaturang ngaturangHCAPN@Li,HCAPN@Li ngaturang ngaturangLiFePO4,HCAPN@Li ngaturang ngaturangNCM811) 用于电化学测试.
主要成果:
- HCAPN具有增强的机械性能,耐溶剂性和可治愈性/可回收性.
- 对称细胞 (HCAPN@Li下载 HCAPN@Li) 的周期寿命为800小时,超电位较低.
- 完整的电池表现出色:超过400个循环 (77%的容量保留) (LiFePO4) 和300个循环后 (79%的容量保留) (NCM811).
结论:
- HCAPN 作为一种有效的保护层,抑制了树的生长.
- 混合动力共价网络为稳定金属阳极提供了一个新的策略.
- 这种方法显著改善了离子电池的电化学性能和循环寿命.
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