三维VS₄/Ti₃C₂T_x/CNTs复合材料作为高性能锂离子电池负极材料

Three-Dimensional VS₄/Ti₃C₂T_x/CNTs Composite Being Used as Negative Electrode Materials for High-Performance Lithium Ion Batteries

摘要: Ti₃C₂T_x MXene由于其优异的导电性和亲水性在锂离子储能领域受到了广泛的关注，但该材料仍存在易堆叠和容量限制的问题。过渡金属硫化物(TMDs)由于其较高的理论比容量、丰富的资源、良好的电子性能和独特的二维层状结构，在便携式电子和电动汽车锂离子存储领域受到了广泛的研究关注。其中，VS₄作为锂离子电池的电极材料，具有含硫量高、结构一维、理论容量高(1196 mAh∙g⁻¹)等特点，但在循环过程中，VS4会快速降解。本文采用简单的一步水热法合成了具有独特三维结构的VS₄/Ti₃C₂T_x/CNTs三元复合材料(表示为VTC)。作为锂离子电池的负极材料，VTC在0.1 A∙g⁻¹电流密度下具有1800 mAh∙g⁻¹的高比容量，在0.1 A∙g⁻¹电流密度下循环200次后仍具有1397 mAh∙g⁻¹的高比容量。

Abstract: Ti₃C₂T_x MXene has received extensive attention in the field of lithium-ion energy storage due to its excellent electrical conductivity and hydrophilicity, but the material still has problems of easy stacking and capacity limitations. Transition metal sulfides (TMDs) have been widely studied in the field of portable electronics and lithium-ion storage for electric vehicles due to their high theoretical specific capacity, abundant resources, good electronic properties and unique two-dimensional layered structures. Among them, VS₄, as the electrode material of lithium-ion batteries, has the characteristics of high sulfur content, one-dimensional structure, and high theoretical capacity (1196 mAh∙g⁻¹), but in the cycle process, VS₄ will rapidly degrade. In this paper, VS₄/Ti₃C₂T_x/CNTs ternary composite (VTC) with unique three-dimensional structure was synthesized by a simple one-step hydrothermal method. As A negative electrode material for lithium-ion batteries, VTC has a high specific capacity of 1800 mAh∙g⁻¹ at 0.1 A∙g⁻¹ current density, and still has a high specific capacity of 1397 mAh∙g⁻¹ after 200 cycles at 0.1 A∙g⁻¹ current density.