硅掺杂锰酸锂的自蔓延燃烧制备及其性能研究

doi:10.19964/j.issn.1006-4990.2022-0413

Abstract

Abstract:

In order to solve the problem of poor cycle performance of LiMn₂O₄ during charge-discharge cycles，silicon doped lithium manganate ultrafine particles（LiMn_1.95Si_0.05O₄，referred to as LMSO） were prepared by self-propagating combustion method.The effects of silicon doping on the crystal structure，morphology and electrochemical properties of lithium manganate were studied by means of X-ray diffraction，scanning electron microscopy and cyclic voltammetry.The results showed that silicon doping did not change the structure of lithium manganate spinel.The particle size of lithium manganate was greater than 0.1 μm.Most silicon doped lithium manganate particles were less than 0.1 μm.The reduced particle size shortened the diffusion path of Li⁺ and improved the electrochemical properties.At 0.2C rate，the specific discharge capacity of LiMn_1.95Si_0.05O₄was as high as 123.7 mA·h/g.After 100 cycles at 1C rate，the capacity retention rate was 95%.

Key words: self-propagating combustion, lithium manganate, cathode material, lithium ion battery

CLC Number:

TQ152

ZHU Zhihong, ZHU Yongfang. Study on preparation and properties of silicon doped lithium manganate by self-propagating combustion[J]. Inorganic Chemicals Industry, 2023, 55(5): 66-70.

Figures/Tables 7

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Study on preparation and properties of silicon doped lithium manganate by self-propagating combustion

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