离子双极相互作用诱导的刚性柔性合SEI用于微型Sn阳极的超稳固存储
Mingyue Li1, Simi Sui1, Xunzhu Zhou2
1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, China.
研究人员开发了一种新的固体电解质间相 (SEI),用于离子电池中的锡阳极. 这种稳定的SEI提高了循环稳定性和能量密度,克服了体积扩张问题.
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:
- 锡 (Sn) 阳极为离子电池提供了高的理论容量.
- 在循环过程中显著的体积膨胀会导致Sn阳极的容量迅速降低.
研究的目的:
- 为阳极开发稳定的固体电解质介相 (SEI).
- 为了减轻体积变化,并提高离子电池的循环稳定性.
主要方法:
- 使用具有不同溶解能力的溶剂进行工程化溶解化学.
- 促进了离子和溶剂的合作分解,以形成混合SEI.
- 研究了SEI的机械强度和化学稳定性.
主要成果:
- 产生了一种机械坚固和化学稳定的有机-无机混合SEI.
- 实现了微型Sn电极的高容量保留 (83.31%在1000个循环后).
- 证明了卓越的速率性能 (270.4 mAh g-1 在4.0 A g-1) 和235.3Wh kg-1 的全电池能量密度.
结论:
- 开发的SEI有效地抑制了体积变化和电解质分解.
- 这一策略为改善高容量变换阳极材料中的储存提供了一条可行的途径.
- 突出了刚性-灵活合SEI的潜力,以提高电池性能.
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