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Preparation method of spherical lithium manganese for lithium-ion battery cathode material

A technology for spherical lithium manganese oxide and lithium-ion batteries, which is applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as low working voltage and difficult preparation

Active Publication Date: 2012-10-03
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiNiO 2 It has the advantages of price and reserve, but the working voltage is low and the preparation is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ⑴. Mix lithium carbonate and manganese dioxide with deionized water at a molar ratio of 1:2, stir for 2 hours to obtain a rheological phase state, stir well to make the reactants mix evenly. Place the reactants in a dry box for 80 oC 6h, drying to remove moisture. Dry the product at 700 oC Under microwave sintering, the primary particles of lithium manganate are obtained.

[0018] (2) Mix the primary particles of lithium manganate with methyl cellulose (MC) aqueous solution to obtain a mixed aqueous phase, in which the mass ratio of lithium manganate to water is 1:1.

[0019] (3) Using kerosene as the oil phase and Span80 as the surfactant, mix the water phase and the oil phase under stirring to obtain a w / o emulsion. Then heat this emulsion to 80-90 o c. Finally at 870 o The agglomerates obtained by sintering under C 6h are the secondary particles of lithium manganate.

[0020] The particle morphology of the product lithium manganate is spherical, evenly dist...

Embodiment 2

[0022] ⑴. Mix lithium carbonate and manganese dioxide with deionized water at a molar ratio of 1:2, stir for 2 hours to obtain a rheological phase state, stir well to make the reactants mix evenly. Place the reactants in a dry box for 80 oC 6h, drying to remove moisture. Dry the product at 700 oC Under microwave sintering, the primary particles of lithium manganate are obtained.

[0023] (2) Mix the primary particles of lithium manganate with methyl cellulose (MC) aqueous solution to obtain a mixed aqueous phase, in which the mass ratio of lithium manganate to water is 1:1.

[0024] (3) Using kerosene as the oil phase and Span80 as the surfactant, mix the water phase and the oil phase under stirring to obtain a w / o emulsion. Then heat this emulsion to 80-90 o c. Finally at 870 o The agglomerates obtained by sintering at C for 12 hours are the secondary particles of lithium manganate.

[0025] The particle agglomeration of the product lithium manganate is relatively o...

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PUM

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Abstract

The invention relates to a preparation method of spherical lithium manganese for lithium-ion battery cathode material, which belongs to the technical field of new energy material. Lithium carbonate or acteate and manganese dioxide are mixed with water by a certain ratio, stirred to prepare rheology phase, dried and sintered for 2h at 700DEG C to prepare primary particles of lithium manganese; theprimary particles and methyl cellulose MC water solution are mixed to prepare aqueous phase; and then kerosene serves as oil phase, Span80 serves as surfactant, and the two are stirred to prepare microemulsion, and the microemulsion is heated at 870DEG C and sintered to prepare the secondary particles of lithium manganese. By adopting the technical scheme, the method effectively controls the micro-particle size of lithium manganese spherical sizes by controlling the sintering time of the secondary particles of lithium manganese. The preparation method is simple, the raw material is easily available, the prepared products have excellent physical chemical and clectrochemical properties and are excellent lithium-ion battery cathode material.

Description

technical field [0001] The invention relates to a method for preparing spherical lithium manganese oxide used as a positive electrode material of a lithium ion battery, and belongs to the technical field of new energy materials. Background technique [0002] The currently used and researched lithium-ion battery cathode materials mainly include: LiCoO 2 , lithium nickel oxide LiNiO 2 , lithium manganese oxide LiMn 2 o 4 Three kinds, of which LiCoO 2 With good electrochemical performance and 3.6V working voltage, the technology is mature, and it is a mature product on the market. LiNiO 2 It has the advantages of price and reserve, but the working voltage is low and the preparation is difficult. Lithium manganate LiMn 2 o 4 Low price, high working voltage, small self-discharge, safety and no pollution, etc., is the preferred cathode material for lithium-ion batteries. [0003] However, with the continuous development of lithium-ion batteries in the direction of high en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/505
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 孙琦朱小奕胡章勇
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL