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Construction and Testing of Coin Cells of Lithium Ion Batteries
Published on: August 2, 2012
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调查PEDOT:PSS结合剂作为Li-S电池硫阴极中的能量扩展剂
Matthew Dent1, Sean Grabe1, Obehi Ayere1
1Center for Engineering Materials, School of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, U.K.
概括
这项研究表明PEDOT:PSS作为阴极结合剂通过减少聚硫化物穿和通过其氧化还原和吸附特性提高容量来提高硫电池性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 计算机建模 计算建模
背景情况:
- 硫 (Li-S) 电池承诺高能量密度,但受到聚硫化物穿的影响,限制了性能.
- 现有的阴极主机往往无法完全抑制穿或引入其他问题.
- 多功能阴极绑定器为各种不同的阴极主机提供了通用解决方案.
研究的目的:
- 调查PEDOT:PSS作为Li-S电池的多功能阴极粘合剂.
- 了解PEDOT:PSS.的电化学行为和聚硫化物相互作用.
- 用实验和多尺度建模方法量化性能提升.
主要方法:
- 用PEDOT:PSS粘合剂对Li-S细胞进行实验测试和材料表征.
- 多尺度建模,包括分子和ab initio模拟,以确定吸附能量.
- 开发一个包含伪电容和吸附效应的多孔连续模型.
主要成果:
- PEDOT:PSS通过表面氧化还原机制表现出伪电容效应.
- 粘合剂有效吸附硫和硫化,减轻阳极污染.
- 实验数据和模拟证实,Li-S细胞的特异容量增加了7-9%.
结论:
- PEDOT:PSS 作为 Li-S 电池中有效的多功能粘合剂.
- 联合PEDOT:PSS的伪容量和吸附性质显著提高了电池的性能.
- 这种方法为克服Li-S电池技术的关键挑战提供了一个有希望的策略.
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