双离子矩阵电解质及其对固体电解质的影响 Si极的介相抑制和演变
Saida Cora1, John T Vaughey2, Niya Sa1
1Department of Chemistry, University of Massachusetts Boston, Boston, Massachusetts 02125, United States.
ACS applied materials & interfaces
|July 18, 2024
概括
在离子电解质中引入离子显著降低了阳极上的固体电解质介相 (SEI) 增长. 这种稳定通过控制SEI演变和减轻副作用反应来提高电池性能和寿命.
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
- 电池技术 电池技术
背景情况:
- 不稳定的固体电解质间相 (SEI) 形成阻碍了 (Si) 阳极在高能量密度电池中的商业化.
- 控制SEI的增长对于改善Si电池的循环寿命和安全至关重要.
研究的目的:
- 调查二进制阴子矩阵 (Mg2++Li+) 在SEI发展和Si阳极上的演变中的作用.
- 了解Mg2+如何影响SEI形成机制和电化学稳定性.
主要方法:
- 在Mg2++Li+二进制电解质中对Si阳极进行电化学研究.
- 在电化学循环过程中分析SEI的组成,生长和演变.
- 离子溶解环境和相间性质的表征.
主要成果:
- 补充Mg2+可通过抑制溶剂减少 (例如,乙烯碳酸盐) 来显著减少70%的初始SEI生长.
- 化后的SEI生长减少了大约80%,包括Mg2+.
- 2+稳定了深化Si相,导致SEI受控生长,更加刚性和均的SEI,并消除了复杂的Li-Si形成.
结论:
- Mg2++Li二进制阴子矩阵有效地控制了Si阳极上的SEI形成和演变.
- 2+离子的变化溶解,导致一个不同的,更稳定的SEI.
- 这一战略为提高下一代基于Si的电池系统的性能和寿命提供了一条途径.
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