一种用于高性能硫电池的离子液电解质添加剂
Zeliang Guan1, Ling Bai1, Binyang Du1
1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China.
Materials (Basel, Switzerland)
|December 9, 2023
概括
本研究介绍了TDA+TFSI,一种离子液体添加剂,通过提高循环稳定性和容量保留,显著提高硫电池性能,解决下一代储能的主要局限性.
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:
- 传统的离子电池在能量密度方面面临限制.
- 硫电池 (LSB) 提供更高的理论特定容量,但遭受严重的容量衰减,特别是在高电流下.
- 提高LSB的稳定性和周期寿命对于其实际应用至关重要.
研究的目的:
- 研究一种离子液体 (IL) 电解质添加剂TDA+TFSI对硫电池性能的影响.
- 为了评估带有和没有TDA+TFSI添加剂的LSB的循环稳定性,容量保留和高电流性能.
- 了解性能改进背后的机制.
主要方法:
- 将5%的TDA+TFSI离子液添加剂添加到用于LSB的传统以太基有机电解质中.
- 对LSB的电化学测试,包括在0.5C和1.0C速度下循环性能.
- 分析排放特定容量,剩余容量,容量衰减率和库伦比效率.
- 研究固体电解质接口 (SEI) 膜的形成.
主要成果:
- 与纯电解质相比,使用5%TDA+TFSI添加剂的LSB显著改善了循环性能.
- 在0.5°C时,100和300个循环后的残余容量为579 mAh g-1和523 mAh g-1,平均衰变率为每个循环0.18%.
- 在1.0°C时,使用添加剂的LSB在100和250个循环后显示出13%更高的剩余容量,以及更稳定的库伦比效率.
- TDA+TFSI添加剂促进了形成更密,更均的SEI膜.
结论:
- TDA+TFSI离子液添加剂有效地提高了硫电池的循环性能和稳定性.
- 性能改善归因于形成一个稳定的固体电解质接口 (SEI) 膜.
- TDA+TFSI是开发高能量密度和长寿命硫电池的一个有前途的添加剂.
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