北京大学深圳研究院潘锋研究组在研究中取得进展。他们的最新研究通过氧空位工程突破Li₄Ti₅O₁₂阳极的容量极限。相关论文于2025年1月14日发表在《结构化学》杂志上。

据了解，零应变尖晶石Li₄Ti₅O₁₂因其出色的循环稳定性而成为锂离子电池极具前景的负极材料。但理论比容量有限、Li⁺扩散系数低、电导率低等问题严重阻碍了其实际应用。

在这项研究中，课题组研究人员展示了一种通过还原热烧结在Li₄Ti₅O₁₂颗粒表面和内部引入丰富氧空位的策略。氧空位可以显著提高Li₄Ti₅O₁₂的电子导电性和锂离子扩散系数，从而显著提高速率性能和降低极化。此外，研究者可以在缺陷表面产生额外的锂离子容纳位点，从而产生超过200 mAh·g^-1的高比容量。

附：英文原文

Title: Break the capacity limit of Li4Ti5O12 anodes through oxygen vacancy engineering

Author: anonymous

Issue&Volume: 2025-01-14

Abstract: The zero-strain spinel Li4Ti5O12 stands out as a promising anode material for lithium-ion batteries due to its outstanding cycling stability. However, the limited theoretic specific capacity, low Li+ diffusion coefficient and electronic conductivity severely hinder its practical application. In this study, we demonstrate a strategy of introducing abundant oxygen vacancies not only on the surface and but also inside the bulk of Li4Ti5O12 particles via reductive thermal sintering. The oxygen vacancies can significantly enhance the electronic conductivity and lithium-ion diffusion coefficient of Li4Ti5O12, leading to a remarkable improvement in rate performance and a reduction in polarization. Moreover, additional lithium-ion accommodation sites can be created at the defective surface, contributing to a high specific capacity of over 200 mAh g1.

DOI: 10.1016/j.cjsc.2024.100504

Source: http://cjsc.ac.cn/cms/issues/752