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具有卓越的速率性能和循环稳定性的高度可逆离子电池,基于Ti₃C₂/CoS₂复合阳极

Shuhao Tian¹, Di Wang¹, Zhe Liu¹

¹National & Locai Joint Engineering Laboratory for Optical Conversion Materials and Technology, School of Materials and Energy, Lanzhou University, Lanzhou 730000, P. R. China.

ACS applied materials & interfaces

|September 13, 2023

概括

在Ti3C2 MXene导电网络上稳定的二硫化物 (CoS2) 纳米粒子改善了离子电池阳极. 这种纳米工程增强了稳定性和电化学性能,克服了CoS2.

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:

过渡金属硫化物 (TMS),特别是二硫化物 (CoS2),由于其高容量,活性和成本效益,显示出作为下一代离子电池 (LIB) 的阳极材料的前景.
然而,CoS2阳极在电池循环过程中遭受体积膨胀和结构降解,限制了它们的实际应用.

研究的目的:

通过开发纳米工程复合结构来解决CoS2作为LIBs的阳极材料的局限性.
通过结构修改,提高基于CoS2的阳极的电化学性能,稳定性和循环寿命.

主要方法:

通过在处理的二维Ti3C2MXene导电网络上稳定纳米尺寸的CoS2颗粒,合成了一种复合材料.
通过实验和理论计算研究了接口特性和键形成 (Ti-O-Co).
评估了Ti3C2/CoS2复合物的电化学性能作为LIBs中的阳极材料,包括特定容量,循环稳定性和速率能力.

主要成果:

在Ti3C2/CoS2接口形成Ti-O-Co键,由含氧的功能组促进,从而增强电子和离子运输.
Ti3C2 / CoS2复合阳极在0.1A g-1下进行了100个循环后,产生了405.8 mAh g-1的高特异容量.
观察到异常的循环稳定性,在1000个循环以1Ag-1后保持近100%的容量,即使材料负载高,电解质比低.

结论:

在Ti3C2 MXene导电网络上的纳米工程CoS2有效地减轻了体积膨胀和结构崩,显著提高了阳极性能.
Ti-O-Co 键的形成在增强电荷转移动力学和电池整体效率方面发挥着至关重要的作用.
这项工作为开发先进的阳极材料,用于高性能和耐久的商用离子电池提供了可行的策略.

关键词:

麦克辛斯 (Mxenes) 是一种物质.阳极材料是一种阳极材料.运动学的动力学.离子电池是一种离子电池.可逆性的可逆性过渡金属硫化物过渡金属硫化物

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