在现场表面聚合超高阴极材料,用于稳定的固态电池
Yuqing Dai1, Zihan Hou1, Xin Yu1
1National Energy Metal Resources and New Materials Key Laboratory, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, School of Metallurgy and Environment, Central South University, Changsha 410083, China.
ACS applied materials & interfaces
|April 1, 2025
概括
一种新的纳米级聚合物涂层有效地保护固态金属电池 (SLMB) 中的超高阴极活性材料 (CAM). 这种表面修改可以防止与聚乙烯氧化物 (PEO) 电解质发生副作用,从而提高电池的稳定性和寿命.
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
- 聚合物科学 聚合物科学
背景情况:
- 超高阴极活性材料 (CAM) 对于高能固态金属电池 (SLMB) 是至关重要的.
- 这些CAM与传统的聚乙烯氧化物 (PEO) 电解质发生有害的副作用反应,限制了电池的性能和寿命.
- 开发CAM表面的保护策略对于推进SLMB技术至关重要.
研究的目的:
- 开发超高CAM的表面修饰策略,以减轻与PEO电解质的副作用.
- 调查现场聚合的机制和氧气空缺在增强Li+运输中的作用.
- 评估SLMB中修改CAM的电化学性能和稳定性.
主要方法:
- 一种自组装的纳米级聚合物涂层被应用于超高CAM,使用固有的残留化合物作为局部离子聚合物的启动剂.
- 在CAM表面通过功能组与过渡金属离子的协调产生氧气空缺.
- 在SLMB中使用LiNi0.9Co0.06Mn0.04O2阴极与以PEO为基础的电解质来评估电化学性能.
- 使用凝透色谱 (GPC) 分析聚合物分解,以测量回收PEO的分子量 (Mw).
主要成果:
- 纳米级聚合物涂层显著提高了超高CAM对PEO电解质的稳定性.
- 涂层的LiNi0.9Co0.06Mn0.04O2阴极在100个循环后保持了92%的容量.
- 使用涂层CAM的SLMB在1C时经过500个周期的稳定运行.
- GPC分析证实了PEO分解的抑制,循环PEO的保存分子量证明了这一点.
结论:
- 拟议的表面修改策略通过保护超高CAM,有效地提高了SLMB的电化学性能和周期寿命.
- 纳米级聚合物涂层促进了快速的Li+转移,并提供了弹性,有助于提高电池稳定性.
- 这种高效且可扩展的涂层方法对先进的固态电池的商业化具有前途.
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