介孔材料
材料科学
锂(药物)
电极
电流密度
微球
电化学
纳米技术
扩散
模板方法模式
化学工程
比表面积
离子
催化作用
化学
物理
工程类
内分泌学
物理化学
热力学
有机化学
医学
量子力学
生物化学
作者
Mengmeng Zhen,Kaifeng Li,Sheng‐Qi Guo,Huzhen Li,Boxiong Shen
标识
DOI:10.1016/j.jallcom.2020.157761
摘要
Hollow spherical structures with abundant mesoporous are of great interest for electrode materials in lithium-ion batteries (LIBs). Although there are many synthetic strategies, using template-free methods to construct the hollow spherical structures still faces great challenges. Herein, we designed a simple template-free method to successfully obtain uniform hollow TiO2 microspheres (TiO2–H) with a well-defined hollow interior and abundant mesoporous. Owing to the structural superiority, the as-prepared TiO2–H as an electrode material for LIBs delivers a high specific capacity of ∼132 mAh g−1 at a current density of 2.0 C after 200 cycles. Besides, it also exhibits satisfying long-term cycling performances with a high specific capacity of ∼100 mAh g−1 at a large current density of 5.0 C after 800 cycles. These superior cycling performances and strong structure stability of TiO2–H electrodes are attributed to the hollow spherical structures with large specific surface areas and rich mesoporous, which can ensure Li ion diffusion and provide sufficient electrochemical reaction sites, as well as remit the large volume changes.
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