为中心的有机盐可为高能量密度电池提供稳定的离子供应
Ziyang Kang1, Shengfei Wang1, Guanbin Wu1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, Research Center of AI for Polymer Science, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
一种新的以为中心的有机盐,-二,有效地弥补了高能电池中的离子损失. 这种新材料提供离子,
科学领域:
- 材料科学
- 电化学
- 有机化学
背景情况:
- 由于阳极材料的局限性,高能量密度电池需要高效的离子补偿,例如基于的阳极初始离子损耗高达20%.
- 目前的离子供应方法可能会导致有害的副作用和气体产生,损害电池的稳定性和安全性.
研究的目的:
- 设计和引入一种新的以为中心的有机盐,-二 (Li2N2C7H4O),用于先进电池的稳定离子供应.
- 证明这种新化合物能够保护电池组件,特别是富含的阴极,并防止不良气体的形成.
主要方法:
- 半监督机器学习被用来发现新的离子供应分子.
- 研究了-胺-2-的电化学行为,重点是通过自由基路径的两步阳极反应.
- 使用光谱和显微特征来确认该分子对阴极的转换和保护作用.
主要成果:
- -二成功通过无气两步阳极反应提供离子,形成二作为保护性添加剂.
- 该化合物有效地抑制了LiNi0.8Co0.1Mn0.1O2 (NCM811) 阴极中的过渡金属溶解.
- 使用这种添加剂的一氧化物 (SiO) / CgNCM811袋细胞显示出更大的容量 (186.7至205.5mAhg-1) 和更好的循环寿命 (84.1%在500个循环后保持).
结论:
- 开发的以为中心的有机盐为高能量密度电池的离子供应提供了一个有希望的新策略.
- 这种方法减轻了离子损失并提高了阴极稳定性,为下一代电池化学铺平了道路.
- 无气体反应机制和保护性添加剂的形成代表了电池电解质设计的重大进步.
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