通过有机盐单层抑制无阳极电池的界面副作用反应
Ningyu Wu1, Min Wang2, Zulipiya Shadike3
1Key Laboratory of Specially Functional Polymeric Materials and Related Technology of the Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.
Small (Weinheim an der Bergstrasse, Germany)
|July 24, 2023
概括
无阳极电池可以实现高能量密度. 在铜电流采集器上的一种新型有机盐单层显著减少了的损失和副作用,从而实现了高效率和长周期寿命.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 无阳极电池具有高能量密度,但在激活过程中会损失,并且由于铜电流收集器的副作用,容量会减弱.
- 在细胞激活过程中形成固体电解质间相 (SEI) 会导致显著的初始容量下降 (≈25%).
- 由于金属与铜 (Cu) 电流收集器上的电解质之间的寄生反应,导致持续的容量衰减.
研究的目的:
- 开发高初始效率,长周期寿命和长日历寿命的无阳极电池.
- 为了减轻的损失,并抑制铜电流收集器上的副作用.
- 研究一种新型有机盐单层的机制,以提高电池性能.
主要方法:
- 铜电流采集器的功能与有机盐单层: ((4-carbamoylphenyl) sulfonyl) ((fluorosulfonyl) imide.
- 改造铜表面的电化学表征和电池性能评估.
- 分析固体电解质介相 (SEI) 组成和形态.
主要成果:
- 在铜表面形成一个富含LiF的介相,指导核和生长.
- 在标准碳酸盐电解质中,初始沉积效率达到93.6%.
- 电流减少到40nAcm-2 ,与裸铜相比减少了十倍.
- 激活后,一个CuCuLiNi0.8 Mn0.1 Co0.1袋式电池保留了其理论容量的95.2% (200 mAh),并运行了600多个周期.
- 日历衰老测试显示,细胞性能没有降低.
结论:
- 有机盐单层有效地使铜表面无活性,最大限度地减少牺牲和副作用.
- 这种方法显著提高了无阳极电池的初始效率,循环寿命和日历寿命.
- 开发的技术为下一代高能量密度电池提供了一个有前途的途径.
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