基于酸盐和酸盐的单晶LiNi0.8Co0.1Mn0.1O2的复合接口使得在高操作电压下具有出色的电化学稳定性
Fu Long1, Yuyang Liu1, Guobin Zhu1
1College of Energy, Soochow University, Suzhou 215006, China.
Materials (Basel, Switzerland)
|May 27, 2023
概括
一种新的被动化技术增强了离子电池的富含的阴极,改善了循环寿命和高压稳定性. 这一突破解决了单晶NCM811材料的容量色和速率性能限制.
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:
- 富含的阴极,特别是单晶LiNi0.8Co0.1Mn0.1O2 (NCM811),对于高能离子电池至关重要.
- 它们的广泛应用受到快速容量/电压色和低速率性能的阻碍.
- 在高切断电压 (4.5-4.6V) 的不稳定性限制了它们的实际使用.
研究的目的:
- 为单晶NCM811阴极开发一种被动化技术.
- 为了提高这些阴极的电化学性能,循环寿命和高压稳定性.
- 研究改善性能的潜在机制,重点关注界面属性.
主要方法:
- 通过一种被动化技术,在单晶NCM811.1的表面上创建一个稳定的复合面接口.
- 在高切断电压 (4.5V和4.6V) 进行了电化学测试,以评估性能.
- 描述技术很可能用于分析接口和阴极结构 (尽管在抽象中没有明确详细说明).
主要成果:
- 复合材料接口显著改善了循环寿命和高压恒定性.
- 在接口上增强的Li+导电性导致了稳定的阴极-电解质介相 (CEI).
- 在5C (4.5V切线) 实现了152 mAh g-1的特定容量,超过了原始NCM811 (115 mAh g-1).
- 在1C的200个循环后,证明了85.4% (4.5V) 和83.8% (4.6V) 的突出容量保留.
结论:
- 消极化技术有效地稳定了富含Ni的阴极表面,减轻了界面侧反应和不可逆转的相位过渡.
- 经过修改的NCM811表现出卓越的电化学性能,使其成为下一代高压离子电池的有希望的候选人.
- 这种方法提供了一个可行的策略,以克服先进的储能应用中富含的阴极的局限性.
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