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A kind of synthetic method of lithium manganate cathode material

A technology of positive electrode material and synthesis method, which is applied to battery electrodes, structural parts, electrical components, etc., can solve the problems of low theoretical capacity of batteries, low cycle performance, reduced material cycle performance, and destruction of lithium manganate structure, etc., so as to improve the cycle Excellent performance, electrochemical performance, and the effect of improving activity and energy density

Active Publication Date: 2022-02-01
株洲市海达新特材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the theoretical capacity of the lithium manganate cathode material is not high and the cycle performance is not high. The biggest problem in the application is that the cycle performance is not good, especially at high temperature, the trivalent manganese ions in the material and the large-rate discharge will form The divalent manganese ions make the material dissolve significantly in the electrolyte, eventually destroying the structure of lithium manganate and reducing the cycle performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of synthetic method of lithium manganate cathode material, comprises the following steps:

[0019] (1) Preparation of lithium manganate precursor: Lithium carbonate and manganese dioxide are mixed according to the Li:Mn molar ratio of 1:2, put into a ball mill and milled for 3 to 5 hours, after mixing, add distilled water and stir to dissolve. React in a reactor at 200°C for 20 to 24 hours. After the reaction is completed and cooled to room temperature, rinse with absolute ethanol for 3 to 5 times, and dry in an oven at 40 to 50°C to obtain a lithium manganate precursor;

[0020] (2) Mixed nickel source: take nickel nitrate according to the ratio of Ni:Li molar ratio of 0.56 to 0.8:1, put nickel nitrate and lithium manganate precursor into a ball mill and ball mill for 2 to 3 hours to obtain a mixture;

[0021] (3) Pre-sintering: put the mixture into the box body, and keep the temperature at a constant temperature for 3-5 hours in a sintering furnace with a tempe...

Embodiment 2

[0025] A kind of synthetic method of lithium manganate cathode material, comprises the following steps:

[0026] (1) Preparation of lithium manganese oxide precursor: Lithium acetate and manganese trioxide are mixed according to the Li:Mn molar ratio of 1:2, put into a ball mill and milled for 3 to 5 hours, after mixing, add distilled water and stir to dissolve, at 180 React in a reactor at ~200°C for 20 to 24 hours. After the reaction is completed and cooled to room temperature, rinse with absolute ethanol for 3 to 5 times, and dry in an oven at 40 to 50°C to obtain a lithium manganate precursor;

[0027] (2) Mixed nickel source: take nickel chloride according to the ratio of Ni:Li molar ratio of 0.56 to 0.8:1, put nickel chloride and lithium manganate precursor into a ball mill and ball mill for 2 to 3 hours to obtain a mixture;

[0028] (3) Pre-sintering: put the mixture into the box body, and keep the temperature at a constant temperature for 3-5 hours in a sintering furna...

Embodiment 3

[0032] A kind of synthetic method of lithium manganate cathode material, comprises the following steps:

[0033] (1) Preparation of lithium manganate precursor: Lithium chloride and manganese carbonate are mixed according to the Li:Mn molar ratio of 1:2, put into a ball mill and milled for 3 to 5 hours. After mixing, add distilled water and stir to dissolve. React in a reactor at 200°C for 20 to 24 hours. After the reaction is completed and cooled to room temperature, rinse with absolute ethanol for 3 to 5 times, and dry in an oven at 40 to 50°C to obtain a lithium manganate precursor;

[0034] (2) Mixed nickel source: take nickel sulfate according to the ratio of Ni:Li molar ratio of 0.56 to 0.8:1, put nickel sulfate and lithium manganate precursor into a ball mill and ball mill for 2 to 3 hours to prepare a mixture;

[0035] (3) Pre-sintering: put the mixture into the box body, and keep the temperature at a constant temperature for 3-5 hours in a sintering furnace with a tem...

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Abstract

The invention discloses a synthesis method of lithium manganate cathode material, which comprises the following steps: (1) preparation of lithium manganate precursor; (2) mixed nickel source; (3) pre-sintering; (4) high-temperature sintering; (5) ) aluminum clad. The lithium manganate cathode material synthesized by the invention can improve the theoretical capacity and cycle performance of the lithium battery.

Description

technical field [0001] The invention relates to the field of lithium battery cathode materials, in particular to a synthesis method of lithium manganate cathode materials. Background technique [0002] Spinel lithium manganese oxide has the advantages of abundant resources, low cost, and environmental friendliness, especially because of its three-dimensional intercalation lithium tunnel can withstand high current charge and discharge, it is recognized as one of the most promising positive electrode materials for lithium ion batteries First, it is widely used in high-capacity power lithium-ion batteries. However, the theoretical capacity of the lithium manganate cathode material is not high and the cycle performance is not high. The biggest problem in the application is that the cycle performance is not good, especially at high temperature, the trivalent manganese ions in the material and the large-rate discharge will form The divalent manganese ions make the material dissol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCY02E60/10
Inventor 李邹洛
Owner 株洲市海达新特材料有限公司
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