定制的+溶解膜在聚乙烯氧化物) 基电解质/超高阴极接口向室温固态电池
Yuqing Dai1, Jiaxu Tan1, Zihan Hou1
1Engineering 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 nano
|August 7, 2024
概括
一个新的接口策略增强了基于聚乙烯氧化物 (PEO) 的固态金属电池与超高阴极. 这种方法稳定了接口,实现了高能量密度和在室温下更好的性能.
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:
- 高能量密度固态金属电池 (SLMB) 需要兼容的电解质和超高阴极.
- 基于聚乙烯氧化物 (PEO) 的电解质面临与超高阴极材料的界面副作用反应,限制了电池的性能.
- 在这些电池系统中,电流采集器受到LiTFSI离子的腐蚀是一个挑战.
研究的目的:
- 在SLMB中克服PEO电解质和超高阴极之间的界面不稳定性.
- 开发一个强大的阴极/电解质接口 (CEI),以提高电池性能.
- 为了防止电流收集器腐蚀,使用双盐系统.
主要方法:
- 构建一个高度电解质 (HCE) 接口与定制的Li+溶解罩.
- 加入二氧化玻酸盐 (LiDFOB) 来缓解 LiTFSI 引起的腐蚀.
- 调整+溶解层中TFSI-和DFOB-离子的比例.
主要成果:
- 形成一个阳离子调节的,强大的阴极/电解质接口 (CEI).
- 在接口处减少不稳定的自由状态溶剂.
- 实现PEO电解质和超高阴极材料之间的兼容性.
- 防止电流收集器腐蚀.
- 在SLMB中在室温下证明216.4mAhg-1 (0.1C) 的高排放特定容量.
结论:
- 开发的接口策略成功实现了在SLMB中使用基于PEO的电解质与超高阴极的使用.
- 双盐 (LiTFSI和LiDFOB) 的协同作用提高了接口稳定性,并防止腐蚀.
- 这项工作为优化下一代高能量密度电池中的阴极/电解质接口提供了有希望的方向.
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