在形成稳定的双层固体电解质间相的情况下,可提高全固态金属电池的稳定性和循环寿命
Lin Yang1,2, Yongbiao Mu1,2, Lingfeng Zou1,2
1Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Nano letters
|October 9, 2024
概括
研究人员使用富含F的添加剂开发了固态金属电池的保护层. 这通过防止副作用,提高能量密度和安全性来提高电池性能和循环寿命.
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:
- 全固态金属电池比传统的离子电池提供更高的能量密度和安全性.
- 基于聚乙烯化物 (PVDF) 和二甲基形式胺 (DMF) 的固体聚合物电解质显示出有前途.
- 剩余的DMF溶剂会导致与金属的接口副作用反应,阻碍电池的性能.
研究的目的:
- 研究固体电解质介相 (SEI) 保护层在现场的形成.
- 为了减轻残留DMF和金属之间的界面副作用.
- 为了提高基于PVDF的全固态金属电池的稳定性和循环寿命.
主要方法:
- 加入富含F的添加剂,包括乙烯碳酸盐和二酸.
- 在现场形成一个双层无机SEI结构.
- 电化学测试对称电池和电池LiFePO4固态电池.
主要成果:
- 一个由外层LiF层和内层Li2O层组成的双层SEI成功形成.
- 对称电池实现了3000小时的延长周期寿命.
- 液体电池 LiFePO4 固态电池在 1C 的 400 个循环后显示出 84% 的容量保留.
结论:
- 开发的SEI保护层有效地抑制了残留DMF和金属之间的副作用.
- 这一战略提高了基于PVDF的全固态金属电池的效率和长期稳定性.
- 这种方法成功地利用了剩余溶剂的好处,提高了电池的性能.
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