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Method for preparation of lithium manganate having uniform spinel structure

A technology of spinel structure and manufacturing method, applied in electrode manufacturing, structural parts, chemical instruments and methods, etc., can solve problems such as uneven structure, achieve faster synthesis rate, improve porosity and specific surface area, and low production cost Effect

Inactive Publication Date: 2004-11-17
HUNAN JINGXIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the cost and performance of the prior art, solve the problem of uneven structure, and propose a method for manufacturing lithium manganate with a uniform spinel structure, thereby providing lithium-ion batteries, especially large-capacity Lithium-ion batteries provide a positive electrode material with uniform structure, stable electrochemical performance, high specific capacity, low cost, and good safety performance.

Method used

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  • Method for preparation of lithium manganate having uniform spinel structure
  • Method for preparation of lithium manganate having uniform spinel structure
  • Method for preparation of lithium manganate having uniform spinel structure

Examples

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Embodiment 1

[0022] Example 1 Pretreatment of MnO 2 Manufacture of:

[0023] Weigh 1600g MnO 2 The percentage content is 92.8, and the bulk density is 2.21g / cm 3 , Electrolytic manganese dioxide with a particle size of -200 mesh, placed in a muffle furnace, heated to 720 ° C, kept for 2 hours, taken out and cooled to room temperature to obtain brown Mn-containing 2 o 3 1376g of the product; then it is formulated into a slurry at a ratio of 1:2 according to the solid-liquid ratio, and the temperature is raised to 85°C under stirring conditions, and 9.5mol of concentrated H is added 2 SO 4 , maintained at 90-98°C for 2 hours, then stopped stirring, allowed it to cool and settle naturally, washed with distilled water to a pH value of 5-6 after separation, dried at 120°C for 6 hours after filtration, and obtained pretreated MnO 2 Product 823g.

[0024] The pretreated MnO 2 powder was tested, its MnO 2 The percentage content is 91.4, the Mn% is 62.8, and the bulk density is 1.55g / cm 3 ...

Embodiment 2

[0025] Embodiment 2 A kind of manufacturing method of lithium manganese oxide material with uniform spinel structure:

[0026] with MnO 2 The percentage content is 92.5, and the bulk density is 2.27g / cm 3 1. Electrolytic manganese dioxide with a particle size of over 325 mesh was used as manganese source material, except that the roasting temperature used was 800° C. and the acid used was concentrated nitric acid, and other conditions were the same as in Example 1 to prepare pretreated MnO 2 . After testing, its MnO 2 The percentage content is 91.2, the Mn% is 62.6, and the bulk density is 1.52g / cm 3 . Accurately weigh the pretreated MnO 2 100g, add 39.2g analytical pure LiNO 3 , then add 80ml of distilled water for gelatinization, after aging for 12 hours, heat and dry while stirring, until the material is lumpy; Down treatment for 24 hours, cooling, ball milling, and passing through a 200-mesh sieve to obtain black lithium manganate lithium ion battery cathode materia...

Embodiment 3

[0028] Embodiment 3 A kind of manufacturing method of lithium manganese oxide material with uniform spinel structure:

[0029] Accurately take by weighing 100g the pretreatment MnO that the method described in embodiment two makes 2 , add 26.3g analytically pure LiOH.H 2 O, add 100ml of distilled water for gelatinization, age for 2 hours, heat and dry while stirring, until the material is lumpy; Down treatment for 10 hours, cooling, ball milling, and passing through a 200-mesh sieve to obtain black lithium manganate lithium ion battery cathode material.

[0030] The XRD test of the obtained material shows that its chemical composition is single and has a uniform spinel structure. The obtained material was used as the positive electrode, and the metal lithium sheet was used as the negative electrode to assemble an experimental battery. The charge and discharge test was carried out in the range of 3.0-4.5V. The first inverse specific capacity of the material was measured to be...

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Abstract

The invention is a kind of lithium ion cell positive material, which concretely refers to a manufacturing method for a kind of lithium manganic acid material which has an even spinel structure. The invention uses high purity electrolyzation MnO2 or / and chemical MnO2 as materials, the MnO2 with multi-aperture skeleton can be acquired through baking in 500-1000oC, acid processed for 0.5-3 hours in 70-100 oC, the block beforehand mixture; then they are synthesized for 8-30 hours in air under temperature of 700-900 oC, the product can acquired after being cooled and grinded. The material has a large capacity, the electrochemical performance is stable, and the cost is low, especially applicable to the lithium ion cell.

Description

【Technical field】 [0001] The invention belongs to the anode material of a lithium ion battery, in particular to a method for manufacturing lithium manganate with a uniform spinel structure. 【Background technique】 [0002] Lithium-ion battery is a chemical power source with superior performance widely used in recent years. Its positive electrode material is mainly an intercalation compound formed by lithium and transition metal element oxides. Among them, the lithium-ion battery has a large specific capacity, stable electrochemical performance, and low cost. Lithium manganese oxide (LiMn 2 o 4 ) has the most development potential as a cathode material. [0003] Lithium manganate synthesis methods are commonly used solid-phase method and liquid-phase method. Among them, the solid-phase method is a solid-state manganese compound and a lithium compound that are fully ground and mixed, and synthesized at a high temperature for a long time. For example, the preparation method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01G1/02C01G45/00H01M4/02H01M4/04H01M4/48H01M4/50H01M4/58H01M10/36
CPCH01M4/1391Y02E60/122C01P2002/72C01P2002/32H01M4/505C01P2006/40H01M4/0471H01M2004/021C01G45/1221H01M10/0525Y02E60/10
Inventor 刘务华阳朝晖刘怡徐保伯胡剑
Owner HUNAN JINGXIN TECH
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