基于的多功能电解质添加剂使稳定的金属电池能够使用高压丰富的阴极
Shu Yang1, Haonan Huang2, Hailin Shen3
1School of Materials Science and Engineering, Tongji University Shanghai 201804 China zhenghuipan@tongji.edu.cn.
Chemical science
|February 10, 2025
概括
一种新的添加剂1,3,6-hexanetricarbonitrile (HTCN) 增强了金属电池中的电解质稳定性. 这提高了高能耗应用的循环寿命和能量密度.
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:
- 具有富含层正极的高能金属电池 (LMB) 由于不稳定的电极接口造成的循环稳定性差,面临着挑战.
- 金属阳极和高压阴极的电化学不稳定性限制了LMBs的实际应用.
研究的目的:
- 开发一种新的电解质添加剂,以提高LMB的电化学稳定性和循环寿命.
- 研究添加剂在阴极和阳极上形成稳定的接相的机制.
主要方法:
- 将1,3,6-hexanetricarbonitrile (HTCN) 添加到传统的碳酸盐基电解质中.
- 使用理论计算,物理表征和电化学测试来分析相间形成和电池性能.
- 组装和测试NCM811//不同质量负载的Li电池.
主要成果:
- HTCN添加剂成功地在LiNi0.8Co0.1Mn0.1O2 (NCM811) 上形成了稳定的阴极电解质介面 (CEI) 和在Li金属上形成了固体电解质介面 (SEI).
- 机制证实HTCN在NCM811上的氧化和在Li金属上的减少,由CN组脱离促进,导致强大的相间.
- 组装的电池实现了高能量密度 (∼330 W h kg-1) 和出色的循环稳定性 (120 个循环,在 1C 保持 88%).
结论:
- HTCN是一种有效的多功能添加剂,用于稳定高能LMB中的电解质.
- 该添加剂促进了理想的CEI和SEI层的形成,增强了离子传输和电池的整体性能.
- 这项工作为改善下一代金属电池的耐用性和能量密度提供了可行的策略.
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