Preparation method of aluminum-doped lithium manganate

A technology of lithium aluminum manganate and manganese powder is applied in the field of preparation and modification of lithium manganate, which can solve the problems of low product capacity and poor cycle performance, and achieve the effects of wide product applicability, high capacity and lower production cost.

Pending Publication Date: 2019-10-15
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of low product capacity and poor cycle performance caused by uneven mixing of various materials in the process of preparing aluminum-doped lithium manganese oxide by solid phase method

Method used

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  • Preparation method of aluminum-doped lithium manganate
  • Preparation method of aluminum-doped lithium manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Take 400g of manganese flakes, grind them with zirconia balls until the particle size is less than 200 mesh, add 2.60L of a mixed solution of water and 50g of ammonium chloride, control the temperature of the solution at 30°C, and use an air pump to inject air under stirring. reaction;

[0035] (2) when manganese powder oxidation reaction (whole oxidation reaction takes 18 hours) carries out 16h, add the mixed solution of ammoniacal liquor and ammonium chloride successively, aluminum chloride solution, the amount of aluminum chloride solution and ammoniacal liquor are respectively 0.073mol and 0.22mol, the mass fraction of aluminum chloride solution is 10%, the mass fraction of ammonia water is 30%, continue to react for 4h after the oxidation reaction is finished, after the reaction is finished, the filter cake obtained by filtering and washing is dried to obtain aluminum-doped trimanganese tetraoxide powder;

[0036] (3) Add 269g of industrial grade lithium carbon...

Embodiment 2

[0039] (1) Take 400g of manganese flakes, mill them with zirconia balls until the particle size is less than 400 mesh, add 1.33L of a mixed solution of water and 27g of ammonium chloride, control the temperature of the solution at 90°C, and use an air pump to feed air under stirring. reaction;

[0040] (2) when manganese powder oxidation reaction (whole oxidation reaction takes 10 hours) carries out 12h, add the mixed solution of ammoniacal liquor and ammonium chloride successively, aluminum chloride solution, the amount of aluminum chloride solution and ammoniacal liquor are respectively 0.29mol and 1.16mol, the mass fraction of aluminum chloride solution is 30%, the mass fraction of ammonia water is 30%, after the oxidation reaction is finished, continue to react for 2h, after the reaction is finished, the filter cake obtained by washing and filtering is dried to obtain aluminum-doped trimanganese tetraoxide powder;

[0041] (3) Add 135g of industrial grade lithium carbonate...

Embodiment 3

[0044] (1) Take 400g of manganese flakes, grind them with zirconia balls until the particle size is less than 300 mesh, add 2L of a mixed solution of water and 40g of ammonium chloride, control the temperature of the solution at 60°C, and use an air pump to feed air under stirring for reaction ;

[0045](2) when manganese powder oxidation reaction (whole oxidation reaction takes 16 hours) carries out 14h, add the mixed solution of ammoniacal liquor and ammonium chloride successively, aluminum chloride solution, the amount of aluminum chloride solution and ammoniacal liquor are respectively 0.22mol and 0.77mol, the mass fraction of the aluminum chloride solution is 26%, the mass fraction of ammonia water is 30%, the reaction is continued for 4h after the oxidation reaction is finished, and the filter cake obtained by washing and filtering after the reaction is finished is dried to obtain aluminum-doped trimanganese tetraoxide powder;

[0046] (3) Add 202g of industrial grade li...

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Abstract

The invention belongs to the technical field of preparation and modification of lithium manganate, in particular to a preparation method of aluminum-doped lithium manganate. The method comprises the following steps: adding water and ammonium chloride solution to manganese powder and then introducing air for reaction; adding mixed solution of ammonia water and ammonium chloride and aluminum chloride solution in turn in the reaction process, and carrying out filtering, washing and drying after reaction to obtain aluminum-doped trimanganese tetraoxide powder; adding the obtained powder to clarified lithium bicarbonate solution and obtaining amorphous Li-Mn-Al-O powder after heating reaction; and calcining the powder at high temperature to obtain aluminum-doped lithium manganate. In the method, the aluminum-doped lithium manganate is produced by reacting the trimanganese tetraoxide uniformly doped with aluminum with lithium bicarbonate solution, which improves the mixing uniformity of lithium carbonate and trimanganese tetraoxide and the doping uniformity of aluminum in the lithium manganate and greatly improves the capacity and cycle stability of the lithium manganate. Moreover, non-high-purity lithium carbonate can be carbonated and pyrolyzed to produce high-purity lithium carbonate as a lithium source, and the goals of low cost and high performance are achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation and modification of lithium manganate, and in particular relates to a preparation method of aluminum-doped lithium manganate. Background technique [0002] With the rapid development of the power supply field of new energy vehicles represented by the application of electric vehicles, the usage rate of lithium batteries in electric vehicles is increasing significantly, and lithium manganate batteries are widely used in passenger cars due to their low cost and good rate performance. Fields such as electric bicycles are widely used. However, lithium manganese oxide has the disadvantages of fast capacity decay (especially under high temperature conditions) and short cycle life, which limits its application in the high-end application field of vehicle power batteries. Studies have shown that doping aluminum in lithium manganate materials can improve the stability of the material structure and avoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M10/052
CPCH01M4/362H01M4/505H01M10/052Y02E60/10
Inventor 鲍维东裴晓东骆艳华钱有军佘世杰刘晨王凡陈静
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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