高性能锂离子电池负极Ti3+自掺杂Li4Ti5O12的制备

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-05-09 DOI:10.1016/j.jeurceramsoc.2025.117525

Enci Jin, Qiushi Song, Hongwei Xie, Zhiqiang Ning, Yu Kai

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引用次数: 0

摘要

加速Li4Ti5O12中电子和离子的转移对于实现锂离子电池的高倍率阳极具有重要意义。本文提出了一种简单、环保、易于放大的制备Ti3+自掺杂LTO的方法，在固相合成过程中采用Ti粉作为还原剂。对Ti3+自掺杂LTO的结构进行了系统表征。研究了温度、时间和Ti粉用量对Ti3+自掺杂LTO结构的影响。Ti3+离子的加入可以提高LTO的电导率和电化学性能。优化后的样品具有优异的高倍率容量（在5 ℃下为142.4 mAh·g−1）和良好的稳定性（在5 ℃下循环1000次后容量保留率为~ 93 %）。该方法也是制备杂原子（Fe, Al， V， Cr和Zn等）掺杂LTO的有效策略。

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Preparation of Ti3+ self-doped Li4Ti5O12 as high-performance anode for lithium ion batteries

Acceleration of the electron and ion transfer in Li₄Ti₅O₁₂ is significant to achieve high-rate anode for lithium ion batteries. Herein, a simple, environment-friendly and easy scale-up method to prepare Ti³⁺ self-doping of LTO is proposed, employing Ti powder as the reductant during the solid-phase synthesis. The structure of the Ti³⁺ self-doped LTO is systemically characterized. The influence of temperature, duration and the amount of Ti powder on the structure of the Ti³⁺ self-doped LTO is investigated. Ti³⁺ ions along with oxygen vacancies can enhance the conductivity and electrochemical performance of LTO. The optimized sample exhibits excellent high-rate capacity (142.4 mAh·g⁻¹ at 5 C) and good stability (capacity retaintion of ∼ 93 % after 1000 cycles at 5 C). This method is also an effective strategy to prepare heteroatom (Fe, Al, V, Cr and Zn, et al.) doped LTO.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.