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
李云凤 1武传宝 2王允威 3冉思宇 1郑宇茜1
作者信息
- 1. 攀枝花学院钒钛学院,四川攀枝花 617000
- 2. 攀枝花学院钒钛学院,四川攀枝花 617000;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
- 折叠
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.
Abstract
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 conductiv-ity 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 irradi-ation 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 car-bon 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 capa-city 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 mAhg-1 at 10 C.
关键词
钛酸锂/负极材料/紫外辐照/碳包覆Key words
lithium titanate/anode material/UV irradiation/carbon coating引用本文复制引用
基金项目
四川省自然科学基金(2022NSFSC0255)
攀枝花市指导性科技计划项目(2021ZD-G-7)
钒钛资源综合利用四川省重点实验室项目(2021FTSZ17)
出版年
2024
国家科技期刊平台
NSTL
万方数据