通过添加剂的协同效应调整富含的NCM阴极的接口稳定性,以防止侵略性的结构崩
Luozeng Zhou1,2, Yiwei Zheng3, Tao Qian4
1School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Inorganic chemistry
|March 12, 2024
概括
双电解质添加剂,二氧化乙硫尼尔甲 (BVM) 和二酸 (LiDFP),为离子电池中的富含的阴极创造了一层保护层,提高了稳定性和能量密度.
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:
- 富含的分层氧化物为离子电池提供高能量密度.
- 高含量导致界面Ni4+氧化还原副作用反应,导致容量衰减和结构不稳定.
- 现有的商业电解质在高阴极中难以保持性能.
研究的目的:
- 开发一种协同的双添加剂策略,用于稳定富含的分层氧化物阴极.
- 为了减轻Ni4+活动和在高电压下溶解.
- 为了提高下一代离子电池的循环稳定性和能量密度.
主要方法:
- 作为双电解质添加剂,将二氧化乙烯硫基甲 (BVM) 和二二酸 (LiDFP) 纳入.
- 在阴极表面上形成富含F,P和S的协同性被动化层.
- 富含Ni的LiNi_xM_{1-x}O_2 (x > 0.95) 按半电池和NCM95红黑石墨囊电池的电化学测试.
主要成果:
- 双添加剂有效地限制了Ni4+的活性和溶解,形成了一个稳定的被动化层.
- 富含F,P和S的层减轻了阻抗的增加,裂和H2-H3相位过渡.
- 富含的半电池在100个循环后显示了83.7%的容量保留,超过了商业电解质 (53.3%的保留).
- 在200个循环后,NCM95 SARDASEDGRAPHITE袋式电池实现了95.5%的容量保留.
结论:
- 协同作用的双添加剂 (BVM + LiDFP) 显著提高了富含的阴极的电化学性能和周期寿命.
- 开发的被动化层策略在抑制有害的副作用和改善结构完整性方面是有效的.
- 这种方法为设计超高能离子电池的先进电解质添加剂提供了有希望的途径.
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