自我牺牲合成的SnO2@Sn核心-异构结构阳极的界面调节,朝着高容量可逆Li+存储方向进行调节
Bo Deng1,2, Rong He2, Jing Zhang2
1Advanced Material Analysis and Test Center, Xi'an University of Technology, Xi'an, Shaanxi 710048, China.
Inorganic chemistry
|September 12, 2023
概括
这项研究引入了一种新的SnO2包裹的Sn纳米颗粒复合物,用于离子电池的添加碳中. 这种设计提高了容量和稳定性,克服了传统基阳极的局限性.
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
- 纳米技术 纳米技术
背景情况:
- 锡基阳极为离子电池提供高容量,但受到体积膨胀和固体电解质间相 (SEI) 不稳定性的影响.
- 快速的容量衰减和结构故障限制了锡阳极的实际应用.
研究的目的:
- 开发一种使用锡纳米颗粒的稳定,高容量的离子电池阳极材料.
- 为了应对锡基阳极体积膨胀和SEI降解的挑战.
主要方法:
- 在多孔导电碳中嵌入的Sn纳米粒子 (SOWSH@PCNC) 包裹SnO2的异构结构核心外的制造.
- 用了一种自我牺牲的Zn模板来形成毛孔.
- 设计了一个富含LiF-Li3N的SEI调制层,以确保均的Li+流量.
- 纳入位点和SnO2@Sn异构连接作为电子/离子促进剂.
主要成果:
- 在SOWSH@PCNC电极实现了高离子容量961mAhg-1在200mAg-1.
- 经过400个周期在500 mA g-1下,表现出极好的循环稳定性,低容量衰变率为0.071%的400个循环后.
- 设计的SEI层和异构结构有效地减轻了体积膨胀,改善了反应动力学.
结论:
- 开发的SOWSH@PCNC材料显示出作为先进离子电池的高性能阳极的重大前景.
- SEI调制和异构结构工程的战略有效地提高了基阳极的电化学性能.
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