Method for preparing lithium manganate battery cathode material

A battery positive electrode and lithium manganese oxide technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of not meeting the requirements of secondary lithium-ion batteries, low specific capacity of spinel lithium manganate, and unsuitability for large-scale To achieve the effect of excellent cycle performance, low price of raw materials and low cost

Inactive Publication Date: 2011-01-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low specific capacity, poor cycle performance and unstable high temperature performance of spinel lithium manganate have been the main obstacles to its commercial application for a long time.
[0003] Although many researchers have done a lot of work and actively researched and developed methods such as sol-gel method and co-precipitation method to prepare spinel lithium manganate cathode materials, and the electrochemical properties of the materials have been improved to a certain extent. However, these methods are not suitable for large-scale industrial production due to their complex process or high cost, and still cannot meet the requirements of lithium manganate cathode materials for secondary lithium ion batteries.

Method used

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  • Method for preparing lithium manganate battery cathode material
  • Method for preparing lithium manganate battery cathode material
  • Method for preparing lithium manganate battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] According to the chemical formula LiCo x mn 2-x f y o 4-y The stoichiometric ratio of (x=0, y=0) weighs metal Mn powder and LiNO 3 (or replace LiNO with LiCl 3 ) as a reaction raw material, with KCl as a co-solvent, according to the total substance amount of the reaction raw material: the amount of KCl substance is a ratio of 1:1 to weigh KCl, then mixed with the reaction raw material, fully ground, placed in an alumina crucible Then put it into a muffle furnace and slowly raise the temperature to 800°C at a rate of 5°C / min, heat and sinter for 8 hours, cool to room temperature, rinse and filter repeatedly with deionized water, and dry to obtain the required LiMn 2 o 4 Powder, its X-ray diffraction pattern is shown in figure 1 Middle curve a. The positions of the diffraction peaks of this sample and the relative intensity of the diffraction peaks can be compared with those of spinel LiMn 2 o 4 (Standard card JCPDS 35-0782) The characteristic spectra match, and ...

Embodiment 2

[0027] According to the chemical formula LiCo x mn 2-x f y o 4-y The stoichiometric ratio of (x=0, y=0) weighs metal Mn powder and LiNO 3 As a reaction raw material, use KCl as a co-solvent, weigh KCl according to the ratio of the total substance amount of the reaction raw material: the amount of KCl substance is 1:5, then mix it with the reaction raw material, fully grind it, and place it in an alumina crucible , then put it into a muffle furnace and slowly raise the temperature to 850°C at a rate of 5°C / min, keep it warm and sinter for 6 hours, after cooling to room temperature, rinse and filter repeatedly with deionized water, and dry to obtain the required LiMn 2 o 4 Powder, its X-ray diffraction pattern is shown in figure 1 Middle curve c. The positions of the diffraction peaks of this sample and the relative intensity of the diffraction peaks can be compared with those of spinel LiMn 2 o 4 (Standard card JCPDS35-0782) the characteristic spectrum matches, and its ...

Embodiment 3

[0030] According to the chemical formula LiCo x mn 2-x f y o 4-y The stoichiometric ratio of (x=0.1, y=0) weighs metal Mn powder, Co(NO 3 ) 2 and LiNO 3 As a reaction raw material, use KCl as a co-solvent, weigh KCl according to the ratio of the total substance amount of the reaction raw material: the amount of KCl substance is 1:1, then mix it with the reaction raw material, fully grind it, and place it in an alumina crucible , and then put it into a muffle furnace and slowly raise the temperature to 800°C at a rate of 5°C / min for sintering for 8 hours. After cooling, rinse and filter repeatedly with deionized water, and obtain the desired LiCo after drying. 0.1 mn 1.9 o 4 Powder, its X-ray diffraction pattern is shown in figure 1 Middle curve d. The positions of the diffraction peaks of this sample and the relative intensity of the diffraction peaks can be compared with those of spinel LiMn 2 o4 (Standard card JCPDS 35-0782) The characteristic spectrum is consisten...

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Abstract

The invention discloses a method for preparing a lithium manganate battery cathode material. The method comprises the following steps of: melting a mixture of molten salt and a reactant through heating, and cooling, washing, filtering and drying to obtain the lithium manganate battery cathode material according to the stoichiometric ratio of a chemical formula LiCoxMn2-xFyO4-y, wherein x is more than or equal to 0 and less than or equal to 0.1, and v is more than or equal to 0 and less than or equal to 0.1; manganese metal powder is taken as a manganese source; lithium nitrate or lithium chloride is taken as a lithium source; and KCl is taken as a cosolvent. A lithium manganate product prepared by adopting the method has the advantages of good crystallization, stable electrochemical performance, high charging and discharging capacity, excellent cycle performance, less preparation process, simple process, low equipment requirement, cheap raw material price, and low cost and can be industrially produced.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of a lithium manganate-based battery positive electrode material with a spinel structure. Background technique [0002] The cathode material of commercial lithium-ion batteries is mainly lithium cobalt oxide (LiCoO 2 ), due to the scarcity of cobalt resources, high price and the impact of its toxicity on the environment, its development potential is limited. Another cathode material lithium nickel oxide (LiNiO 2 ) Although the price is lower and the performance is better, the preparation is complicated and there are high temperature safety problems. In contrast, spinel lithium manganese oxide (LiMn 2 o 4 ) has become one of the most promising electrode materials for a new generation of lithium-ion batteries due to the advantages of abundant manganese materials, low price, non-toxicity, low pollution, easy re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/505
CPCY02E60/122Y02E60/10
Inventor 梁玉军程正刘明宇周炜
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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