阴性纤维素纳米纤维固体电解质:为硫电池提供高离子迁移和多硫化物吸附的途径
Chenhao Ji1, Shuanglin Wu1, Feng Tang1
1Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China.
Carbohydrate polymers
|April 14, 2024
概括
这项研究通过结合修改的纤维素纳米纤维来增强硫电池的固态电解质. 新的复合材料提高了离子导电性和机械强度,解决了电池性能和安全方面的关键挑战.
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
- 可持续化学 可持续化学
背景情况:
- 聚乙烯氧化物 (PEO) 固体电解质提供安全性,但具有低离子导电性和机械不稳定性.
- 这些限制在硫电池中特别有害,因为聚硫化物穿.
- 回收材料为可持续的电解质开发提供了机会.
研究的目的:
- 为硫电池开发一种高性能固态电解质.
- 为了应对低离子导电性,聚硫化物迁移和PEO电解质中的机械脆弱性的挑战.
- 用回收的香烟过器来制造先进的电池材料.
主要方法:
- 从回收的香烟过器中将纤维素 (CA) 电成四级氨基离子修饰纤维素 (QACC) 纳米纤维.
- 将QACC纳米纤维集成到PEO电解质矩阵中.
- 离子导电率的表征,离子转移数,机械强度和电池性能.
主要成果:
- 经QACC修改的PEO电解质表现出增强的离子导电能力 (2.07 × 10−4 S cm−1在60°C) 和1.5倍高的离子转移数.
- 由于四级基对聚硫化物的亲和力,聚硫化物迁移被有效地抑制.
- 电解质的机械强度从0.49MPa显著增加到7.50MPa.
- 复合电解质在对称电池中表现稳定,使用时间为500小时和100个周期.
结论:
- 开发的复合PEO固体电解质有效地克服了纯PEO的局限性.
- 使用回收材料为先进的固态电解质提供了一个可持续的途径.
- 这种方法在提高硫电池的效率和安全性方面显著有前途.
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