一种含有非溶解性/LiNO3的电解质,用于稳定LiMn电池中的动态接口
Tian Tang1,2, Nyalaliska W Utomo2, J X Kent Zheng3
1Department of Materials Science and Engineering, Cornell University Ithaca NY 14853 USA.
RSC advances
|May 13, 2024
概括
这项研究引入了一种新型电解质混合物 (EC中的LiNO3 + LiTFSI),可以提高氧化 (LiMn2O4) 电池的稳定性. 新的电解质防止溶解,改善沉积,使1000多个稳定的充放电周期.
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:
- 像LiMn2O4这样的基于的螺旋对具有成本效益的高能量密度电池有很大的希望.
- 然而,LiMn2O4电池由于Mn溶解和不稳定的Li金属阳极行为而遭受容量衰减.
- 现有的电解质很难同时解决阴极和阳极的降解.
研究的目的:
- 设计和评估一种新型的电解质系统,用于基LiMn2O4电池,以减轻两电极的降解.
- 为了克服快速减产能力的局限性,并提高长期循环稳定性.
- 了解电解质性能提升背后的基本机制.
主要方法:
- 在乙烯碳酸盐 (EC) 中使用LiNO3和LiTFSI二元混合物的电解质配方.
- 电化学性能测试,包括充放电循环稳定性.
- 使用原子分辨率电子显微镜和X射线/同步射线衍射进行高级表征.
主要成果:
- LiNO3 + LiTFSI/EC 电解质显著改善了循环稳定性,超过了 1000 个循环.
- 减少LiMn2O4阴极的结晶学降解,包括尽量减少Mn漏和散装缺陷.
- 通过独特的和联合沉积机制,增强了金属阳极可逆性.
- 在阴极和阳极上同时稳定接口.
结论:
- 开发的LiNO3 + LiTFSI/EC电解质有效抑制Mn溶解,并稳定了Li金属阳极.
- 这种双重稳定导致了极大改善Li的电池的循环寿命.
- 这些发现为推进实际的,高性能的LiH2LiMn2O4储能系统提供了有希望的途径.
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