Effect of SiO2 coating on microstructure and electrochemical properties of LiNi0.5Mn1.5O4 cathode material

IF 2.7 4区工程技术 Q3 ELECTROCHEMISTRY

Journal of Electrochemical Energy Conversion and Storage Pub Date : 2023-03-20 DOI:10.1115/1.4062161

Jinjing Du, Y. Guo, Meng Zhou, Ya-ru Cui, Bin Wang, Qian Li, Jun Zhu, Dandan Zhao

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引用次数: 0

Abstract

We present a simple method for producing SiO2 modified LNMO cathode materials. Manganese carbonate was directly mixed with nickel nitrate and lithium hydroxide, and a spherical structure LNMO cathode material was prepared by two-step calcination, then ethyl orthosilicate and LNMO powder were simply mixed in solid and liquid phase to prepare SiO2-coated LNMO material. The effect of SiO2 coating on the structure of LNMO was studied by XRD, SEM, TEM, TG-DSC. An amorphous SiO2 coating layer developed on the surface of the LNMO particles in the modification, and this could alleviate the strike of HF caused by electrolyte decomposition as well as the development of a solid electrolyte interphase. The electrochemical performance of the coated material was as follows: when the amount of SiO2 was 0wt%, 1wt%, 2wt% and 3wt%, the initial discharge capacity of the sample was 98.2, 84.1, 101.3 and 89.8mAh·g−1, respectively. After 50 charge-discharge cycles, the capacity retention rates are 92.7%, 66.8%, 97.9% and 93.8%, respectively. The cyclic stability of the samples can be significantly improved when the SiO2 coating amount is 2wt% and 3wt%, indicating that SiO2 coating can not only improve the discharge specific capacity of the material, but also improve its cyclic stability.

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SiO2涂层对LiNi0.5Mn1.5O4正极材料微观结构和电化学性能的影响

我们提出了一种生产SiO2改性LNMO阴极材料的简单方法。将碳酸锰与硝酸镍和氢氧化锂直接混合，通过两步煅烧制备了球形结构的LNMO正极材料，然后将原硅酸乙酯和LNMO粉末在固相和液相中简单混合，制备了SiO2包覆的LNMO材料。采用XRD、SEM、TEM、TG-DSC等方法研究了SiO2涂层对LNMO结构的影响。在改性中，在LNMO颗粒的表面上形成了非晶SiO2涂层，这可以减轻电解质分解引起的HF的冲击以及固体电解质界面的形成。涂层材料的电化学性能如下：当SiO2含量为0wt%、1wt%、2wt%和3wt%时，样品的初始放电容量分别为98.2、84.1、101.3和89.8mAh·g−1。经过50次充放电循环后，容量保持率分别为92.7%、66.8%、97.9%和93.8%。当SiO2涂层量为2wt%和3wt%时，样品的循环稳定性可以显著提高，表明SiO2涂层不仅可以提高材料的放电比容量，还可以提高其循环稳定性。

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来源期刊

Journal of Electrochemical Energy Conversion and Storage Engineering-Mechanics of Materials

CiteScore

4.90

自引率

4.00%

发文量

期刊介绍： The Journal of Electrochemical Energy Conversion and Storage focuses on processes, components, devices and systems that store and convert electrical and chemical energy. This journal publishes peer-reviewed archival scholarly articles, research papers, technical briefs, review articles, perspective articles, and special volumes. Specific areas of interest include electrochemical engineering, electrocatalysis, novel materials, analysis and design of components, devices, and systems, balance of plant, novel numerical and analytical simulations, advanced materials characterization, innovative material synthesis and manufacturing methods, thermal management, reliability, durability, and damage tolerance.