钛酸锂的碳包覆、紫外辐照改性及电化学性能研究  

Carbon coating, UV irradiation modification of lithium titanate and their electrochemical properties

作　　者：李云凤 武传宝 王允威[3] 冉思宇 郑宇茜 Li Yunfeng;Wu Chuanbao;Wang Yunwei;Ran Siyu;Zheng Yuqian(School of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,Sichuan,China;Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province,Panzhihua 617000,Sichuan,China;School of Biological and Chemical Engineering,Panzhihua University,Panzhihua 617000,Sichuan,China)

机构地区：[1]攀枝花学院钒钛学院,四川攀枝花617000 [2]钒钛资源综合利用四川省重点实验室,四川攀枝花617000 [3]攀枝花学院生物与化学工程学院,四川攀枝花617000

出　　处：《钢铁钒钛》2024年第3期71-78,共8页Iron Steel Vanadium Titanium

基　　金：四川省自然科学基金(2022NSFSC0255);攀枝花市指导性科技计划项目(编号:2021ZD-G-7);钒钛资源综合利用四川省重点实验室项目(2021FTSZ17)。

摘　　要：钛酸锂(LTO)因其结构的“零应变”特性,成为重要的锂离子电池负极材料。然而,钛酸锂较低的电子电导率限制了其高倍率性能。提出一种光辅助的溶胶-凝胶法,制备了LTO/C负极材料,研究了不同碳源比例和光辐照对LTO/C显微结构和电化学性能的影响。与蔗糖为碳源包覆结果相比,葡萄糖为碳源时由于LTO表面包覆的碳石墨化程度更高,其倍率性能更优。在紫外辐照条件下,由于LTO/C粒径的减小,使得紫外辐照后的LTO/C在不同倍率下的放电比容量均高于无紫外辐照的LTO/C放电比容量。在10 C放电倍率下,20%葡萄糖为碳源辅以紫外照射工艺制备的LTO/C样品放电比容量达到101.5 mAh/g。Lithium titanate(Li4Ti5O12,abbreviated as LTO)has become an important anode material for lithium-ion batteries due to its structural"zero-strain"property.However,the low electronic conductivity of lithium titanate limits its high-rate performance.In this paper,a light-assisted sol-gel method was proposed to prepare LTO/C anode materials,the effects of different carbon source ratios and light irradiation on the microstructure and electrochemical properties of LTO/C were investigated.Compared with the results of sucrose as the carbon source,the rate performance of the LTO/C with glucose as the carbon source is better due to the higher degree of graphitized carbon coated on the surface of LTO.Under the UV irradiation condition,the reduction of LTO/C particle size makes the discharge specific capacity of UV-irradiated LTO/C higher than that of LTO/C without UV irradiation at different rates.The discharge specific capacity of the LTO/C sample prepared with 20%glucose as carbon source assisted with UV irradiation process reaches 101.5 mAh·g−1 at 10 C.

关 键 词：钛酸锂 负极材料 紫外辐照 碳包覆 

分 类 号：TF823[冶金工程—有色金属冶金] TM912[电气工程—电力电子与电力传动]