不同质的W/WN晶体的界面调制使硫电池中的高效的硫氧化还原反应成为可能
Ruirui Wang1, Lin Wang1, Ziwei Xu1
1Suzhou Key Laboratory for Nanophotonic and Nanoelectronic Materials and Its Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
一个新的W/WN@PNCF介层有效地抑制了硫 (Li-S) 电池中的穿效应. 这一进步为先进的储能系统提供了高容量,优异的速率性能和稳定的循环.
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:
- 硫 (Li-S) 电池在理论上具有很高的能量密度,但面临着挑战.
- 聚硫化物 (LiPSs) 缓慢的转化动力学和穿效应限制了其实际应用.
研究的目的:
- 开发一个灵活的中间层,以解决Li-S电池的局限性.
- 通过催化和物理封闭来提高Li-S电池的电化学性能.
主要方法:
- 使用异质W/WN晶体制造灵活的中间层,用Zn模板方法将其限制在多孔的添加碳纤维 (W/WN@PNCF) 中.
- 对LiPSs中介层的结构性质,催化活性和电子调制效应的研究.
- 使用W/WN@PNCF介层的Li-S电池的组装和电化学测试.
主要成果:
- 在W/WN@PNCF介层中,有丰富的多孔结构和催化活跃的W/WN位点.
- W/WN的异质接口表现出电子调制,从而实现有效的LiPS吸附和催化.
- 组装的Li-S电池在0.2C时实现了1412.3mAhg-1的高特异容量,优异的速率性能 (814.5mAhg-1在5C时) 和稳定的循环.
- 在高硫负载 (7.1 mg cm-2) 和低电解质/硫比 (6.0 μL mg-1) 的情况下,在0.2C下保持了120个周期的4.8 mAh cm-2的高面积容量.
结论:
- 开发的W/WN@PNCF中间层有效地减轻了穿效应,并提高了Li-S电池的性能.
- W/WN的异质接口和催化特性对于增强LiPS转换至关重要.
- 这项工作为设计高性能Li-S电池的先进异质催化剂提供了策略.
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