用于全固态电池的聚乙烯氧化物电解质,使用微型/碳阳极,具有增强的速率能力和循环能力
Panpan Dong1,2, Younghwan Cha2, Xiahui Zhang2
1Research Institute of Frontier Science, Southwest Jiaotong University, Chengdu 610031, China.
ACS applied materials & interfaces
|July 29, 2024
概括
研究人员通过用电解质预处理,为全固态电池开发了改进的/碳阳极. 这些增强的阳极显示出更高的容量和稳定性,为更好的电池性能铺平了道路.
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:
- (Si) 阳极为离子电池 (LIB) 提供高容量,但与液体电解质的稳定性不佳.
- 使用固体电解质的全固态电池 (ASSLB) 是克服这些局限性的有希望的替代方案.
- 为ASSLBs开发稳定和高性能基阳极仍然是一个关键的挑战.
研究的目的:
- 为了研究基于聚乙烯氧化物 (PEO) 的ASSLB中修改的微型多孔/碳 (Si/C) 电极的性能.
- 评估电极预处理 (原始,预化,预透) 对电化学性能的影响.
- 了解电解质机械稳定性与离子导电性在高温下ASSLB性能中的作用.
主要方法:
- 制造三种类型的Si / C电极:原始的,用液态电解质预化,并用聚合物电解质预透.
- 使用这些电极与基于PEO的固体电解质配对组装ASSLB.
- 电化学表征包括循环性能,特定容量和在60°C时的库伦比效率.
主要成果:
- 发现PEO电解质的机械稳定性对于60°C的ASSLB性能比离子导电性更为关键.
- 预化和预透的Si / C电极都表现出比原始电极更高的特异容量,这是由于活性物质利用率的提高.
- 一个带有预透Si / C电极的固态半电池在100个周期后在800 mA g-1和60 °C下实现了~1,000 mAh g-1,平均库伦比效率>98.9%.
结论:
- 电极预处理策略,特别是用聚合物电解质进行预透,显著提高ASSLB中Si/C阳极的性能.
- 电极微结构的合理设计对于优化界面离子传输和实现高性能ASSLB至关重要.
- 这种方法为开发下一代固态电池的先进基阳极提供了可行的途径.
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