固体液体混合电极的接口设计,用于高能量密度的灵活离子电池
Wenyan Chen1,2, Zhen Zhang2, Fangchang Zhang2
1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150006, China.
Advanced materials (Deerfield Beach, Fla.)
|May 22, 2025
概括
使用微粒 (SiMPs) 的新型固体液体混合电极克服了离子电池中的体积膨胀问题. 这种设计可以实现高能量密度和灵活的电池应用,并提高稳定性.
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:
- 微粒 (SiMPs) 承诺高能量密度的离子电池.
- SiMP体积膨胀 (>300%) 会导致颗粒断裂和快速容量衰减.
- 现有的电极设计难以应对的体积变化.
研究的目的:
- 为高能量密度的灵活离子电池设计一种新的固体液体混合电极 (Si@EGaSn).
- 为了解决SiMP体积扩张造成的产能衰减问题.
- 为了提高基于的电极的稳定性和性能.
主要方法:
- 开发了一种Si@EGaSn电极,其中含有液相SiMP顶层和固相铜合金底层.
- 研究了混合电极的电气连接和固体电解质接口形成.
- 使用NCM811//Si@EGaSn配置制造并测试的柔性离子袋式电池.
主要成果:
- Si@EGaSn电极证明了破碎的SiMP和稳定的固体电解质接口的优良电气连接.
- 在0.5 A g-1下达到767.1 mAh g-1的可逆容量,在200个周期内保持>99%的容量.
- 灵活的袋式电池表现出高面积容量3.2 mAh cm-2,500 Wh L-1体积能量密度,并在3000个曲周期后可以忽略的衰变.
结论:
- 固体液体混合电极设计有效地减轻了SiMP体积膨胀问题.
- Si@EGaSn电极使高能量密度和强大的灵活离子电池成为可能.
- 这种方法为开发先进的储能设备提供了新的战略.
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