对于丰富的多层氧化物阴极的综合氧气约束策略.
Miao Chang1, Fangyuan Cheng1, Wen Zhang1
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
ACS nano
|December 25, 2024
概括
一种新的多层次氧气约束策略稳定了高能离子电池的富含的分层氧化物阴极. 这种方法减轻了氧气损失和降解,提高了在高电压和高温下循环稳定性.
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:
- 富含的分层氧化物对于高能离子电池至关重要.
- 这些材料遭受氧气损失和结构退化,限制性能.
- 目前的表面修改对这些问题提供有限的保护.
研究的目的:
- 开发一种有效的氧气约束策略,以稳定富含的多层氧化物阴极.
- 为了解决电池运行期间的氧气演变和结构降解.
- 为了提高电化学性能和离子电池的循环稳定性.
主要方法:
- 设计了一种La,Fe渐变扩散层和LaFeO3涂层在Ni丰富的层状颗粒上.
- 在电极配方中加入了抗氧化剂粘合剂.
- 构建了一个三层防御系统:地下氧气固定,接口氧气阻断和表面氧气捕获.
主要成果:
- 实现了有效的表面被动化和减轻了散装/表面退化.
- 抑制有害的副作用,从而提高了电化学性能.
- 在半电池和全电池中表现出令人印象深刻的循环稳定性,即使在4.7V和45°C.
结论:
- 与单个修改相比,多层氧气约束策略提供了更好的保护.
- 这种方法显著提高了丰富的多层氧化物阴极的稳定性和性能.
- 该策略可扩展到其他面临氧气释放挑战的分层氧化物阴极,推进高能电池开发.
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