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Lithium-rich material, modification method and application thereof

A lithium-rich material and modification technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the instability of spinel materials, manganese-based spinel coating layer and element doping, modified lithium-rich Material difficulties, etc.

Active Publication Date: 2021-04-20
深圳索理德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the Jahn-Taller effect, Mn 2+ Both the dissolution and the phase transition of the spinel material make the spinel material unstable
In view of the above reasons, it is very difficult to modify lithium-rich materials by obtaining manganese-based spinel coating and element doping at the same time.

Method used

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  • Lithium-rich material, modification method and application thereof
  • Lithium-rich material, modification method and application thereof
  • Lithium-rich material, modification method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Step 1: Take manganese nitrate, cobalt nitrate, nickel nitrate, and lithium nitrate, dissolve them in 30ml deionized water at a molar ratio of 0.54:0.13:0.13:1.2, dissolve citric acid in another 30ml deionized water, and mix citric acid with metal cations The molar ratio is 2:1;

[0057] Step 2: Add the citric acid solution to the metal salt solution, magnetically stir overnight at a stirring speed of 500 rpm, then evaporate the solvent to dryness, and place the obtained material in a muffle furnace for calcination at 900°C for 12 hours;

[0058] Step 3: Dissolve bis(catechol)diboronic acid ester in nitrogen methyl pyrrolidone solution, the concentration of bis(catechol)diboronic acid ester is 20mg / ml, then disperse 10g of lithium-rich manganese-based material into 100ml of this solution was heated to 100°C, stirred overnight at 500rpm, then centrifugally filtered several times, and then calcined at 500°C for 6h to obtain a lithium-rich manganese-based material modified...

Embodiment 2

[0064] Step 1: get the mol ratio of manganese sulfate, cobalt sulfate, nickel sulfate 0.54:0.13:0.13 to be dissolved in 100ml deionized water, sodium carbonate is dissolved in 100ml deionized water, the mol ratio of sodium carbonate and metal cation is 1.5:1, in The pH is controlled at about 7.5, and the co-precipitation experiment is carried out under the reaction conditions of 50°C;

[0065] Step 2: After drying the obtained precipitate, mix it with lithium acetate (the molar ratio of lithium acetate: manganese sulfate: cobalt sulfate: nickel sulfate is 1.2:0.54:0.13:0.13), and then calcinate at 900°C for 12 hours to obtain a lithium-rich manganese-based material ;

[0066] Step 3: Disperse 100 mg of lithium-rich manganese-based material into a nitrogen-methylpyrrolidone solution containing 20 mg of bis(catechol)diboronic acid ester, and then undergo a heating reaction, the heating temperature is 100°C, and the reaction time is 24h), After centrifugation and vacuum drying, ...

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Abstract

The invention discloses a lithium-rich material, a modification method and an application thereof. The modification method comprises the following steps that the lithium-rich material is dispersed into an organic boron solution, and after organic boron and the lithium-rich material fully react, an obtained product is calcined to obtain the lithium-rich material, wherein the organic boron is bis(catechol) diborate; and the organic boron solution includes N-methyl pyrrolidone. Dual purposes of surface boron-doped spinel coating and borate doping are achieved under the action of a surface in-situ reaction and sintering.

Description

technical field [0001] The invention belongs to the technical field of battery cathode material preparation, and in particular relates to a lithium-rich material, its modification method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily regarded as an acknowledgment or in any form to imply that the information constitutes the prior art already known to those skilled in the art. [0003] Lithium-ion batteries, as the main means of energy storage at present, are used in many fields, but the low energy density of lithium-ion batteries has seriously restricted its application and development. Among the constituent materials of lithium-ion batteries, the positive electrode material has become the key to restricting the energy density of lithium-ion batteries because of its specific capacity is much lower than t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 慈立杰聂祥坤
Owner 深圳索理德新材料科技有限公司
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