三明治型N-C@CoTe2@C阳极:一种应力缓冲纳米结构,用于稳定的离子储存
Lixiang Wang1, Yahua Hu1, Khak Ho Lim2
1School of Mechanical and Electrical Engineering, Jiaxing Nanhu University, Zhejiang, 314001, China. wlx@jxnhu.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|September 23, 2023
概括
研究人员开发了一种新的碳封装二化物 (CoTe2) 结构,用于离子电池 (SIB). 这种设计显著提高了循环稳定性和速度性能,解决了过渡金属化物的容量衰减问题.
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:
- 过渡金属化物 (TMTes) 为离子电池 (SIB) 提供高体积容量.
- 循环时的体积膨胀导致TMTes的容量降低,限制了它们的实际使用.
- 开发稳定的阳极材料对于推进SIB技术至关重要.
研究的目的:
- 为SIBs设计一个稳定的二化物 (CoTe2) 阳极材料.
- 为了减轻在化/脱过程中体积应变引起的容量减弱.
- 为了研究设计材料中的储存机制.
主要方法:
- 制造一种"三明治型"结构,其中的CoTe2纳米晶体被限制在碳层之间.
- 使用多孔纤维素衍生纤维作为内部碳框架.
- 采用聚烯 (PVP) 衍生的碳层作为外部保护外.
- 使用现场XRD/TEM和动力测试进行表征.
主要成果:
- 该N-C@CoTe2@C电极在2.0A g-1.0的3000个周期中表现出极好的循环稳定性.
- 实现了优秀的速率能力,在5.0 A g-1时达到113.8 mA h g-1.
- 确定了一种多步骤的转化反应和一种双模型的Na-储存过程.
结论:
- 碳封闭策略有效地抑制了CoTe2.2的体积变化和结构粉碎.
- 开发的材料展示了SIB阳极的有希望的长期循环稳定性和速度性能.
- 这种方法为制造具有成本效益,高性能SIB阳极材料提供了可行的途径.
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