Lattice modulation improving surface passivation of LiMnPO4 for stable cycling at high temperatures

IF 9.1 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Progress in Solid State Chemistry Pub Date : 2024-06-01 DOI:10.1016/j.progsolidstchem.2024.100460

Wei Chen , Haisheng Fang

引用次数: 0

Abstract

The undesirable capacity degradation of LiMnPO₄ upon cycling at high temperatures is a challenge to its practical application. Herein, a lattice doping strategy is adopted to improve the high-temperature cycling stability of LiMnPO₄, and the comparative study reveals that Al³⁺ doping into LiMnPO₄ in a form of Li_0.98Al_0.02MnPO₄ is highly beneficial to the cycling performance of LiMnPO₄ and the capacity retention can be significantly improved from 67.4 % to 93.4 % after 100 cycles at 1C at 60 °C, because Al³⁺ doping can effectively reduce passivation products deposition on the cathode and manganese dissolution in the electrolyte, which thus improve the cathode/electrolyte interface and stabilize the structure of LiMnPO₄ at high temperatures.

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晶格调制改善磷酸锰锂的表面钝化，实现高温下的稳定循环

锰酸锂在高温循环时会出现容量衰减，这对其实际应用是一个挑战。本文采用晶格掺杂策略来提高锰酸锂的高温循环稳定性，对比研究发现，以 LiAlMnPO 形式在锰酸锂中掺杂 Al 非常有利于提高锰酸锂的循环性能，在 60 °C 下 1C 循环 100 次后，容量保持率可从 67.4% 显著提高到 93.4%。4% 提高到93.4%，这是因为铝掺杂能有效减少阴极上钝化产物的沉积和电解液中锰的溶解，从而改善阴极/电解液界面，稳定高温下 LiMnPO 的结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Solid State Chemistry 化学-无机化学与核化学

CiteScore

14.10

自引率

3.30%

发文量

期刊介绍： Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.