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Porous spherical lithium manganate cathode material and preparation method thereof

A spherical lithium manganate, cathode material technology, applied in the direction of positive electrode, manganate/permanganate, nanotechnology for materials and surface science, etc., can solve pore size regulation, increase energy consumption, process Complex problems, to achieve the effect of easy operation, energy saving, wide source of raw materials

Active Publication Date: 2015-03-11
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above ideas can obtain porous spherical lithium manganate, the process is more complicated, and it is necessary to synthesize porous spherical Mn 2 o 3 Precursor powder, which increases energy consumption and cannot control the pore size of the ball

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  • Porous spherical lithium manganate cathode material and preparation method thereof
  • Porous spherical lithium manganate cathode material and preparation method thereof

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preparation example Construction

[0015] The preparation method of porous spherical lithium manganese oxide cathode material comprises the following steps:

[0016] (1) Dissolve the manganese salt in the aqueous solution, and add a certain molar amount of hydrogen peroxide:

[0017] (2) Under stirring conditions, add the aqueous solution of sodium carbonate and sodium hydroxide to the above solution, and centrifuge, wash and dry the obtained precipitate;

[0018] (3) Mix the dried precipitate with lithium carbonate evenly, and then roast at 700°C for 3 to 10 hours to obtain a porous lithium manganate material.

[0019] The invention regulates the size of the pore diameter by regulating the usage amount of hydrogen peroxide, the usage amount and the molar ratio of sodium hydroxide and sodium carbonate.

[0020] In the step (1) of the present invention, the manganese salt is manganese sulfate, or manganese acetate, or manganese chloride, and the molar concentration of manganese ions is 0.2 mol / L~1.5 mol / L; the ...

Embodiment 1

[0028] (1) Mn(C 2 h 3 o 2 ) 2 .4H 2 O is dissolved in water, where the molar concentration of manganese ions is 0.2 mol / L, and then 0.1 mol of H is added 2 o 2 ;

[0029] (2) Under stirring conditions, add sodium carbonate and sodium hydroxide aqueous solution with a molar ratio of 10:1 to the above aqueous solution, and the sodium ion concentration of the added sodium carbonate and sodium hydroxide is 0.4 mol / L;

[0030] (3) The solid precipitate generated in the solution is processed by centrifugation, washing, drying and other steps, and the obtained solid precipitate powder is manually ground with Li 2 CO 3 Mix well (Li:Mn=1.05:2), and calcinate the mixture at 700°C for 5 hours to obtain porous spherical lithium manganate material.

[0031] The prepared lithium manganate cathode material has a porous structure with an average pore diameter of 40 nm and a specific surface area of ​​30 m 2 / g; the diameter is 500 nm, and it is formed by the accumulation of particles ...

Embodiment 2

[0033] (1) Mn(C 2 h 3 o 2 ) 2 .4H 2 O is dissolved in water, where the molar concentration of manganese ions is 1.5 mol / L, and then 0.85 mol of H is added 2 o 2 ;

[0034] (2) Under stirring conditions, add sodium carbonate and sodium hydroxide aqueous solution with a molar ratio of 10:1 to the above aqueous solution, and the sodium ion concentration of the added sodium carbonate and sodium hydroxide is 4.5 mol / L;

[0035] (3) The solid precipitate generated in the solution is processed by centrifugation, washing, drying and other steps, and the obtained solid precipitate powder is ball milled and Li 2 CO 3 Mix well (Li:Mn=1.05:2), and calcinate the mixture at 700°C for 10 hours to obtain porous spherical lithium manganate material.

[0036] The prepared lithium manganate cathode material has a porous structure with an average pore diameter of 60 nm and a specific surface area of ​​13 m 2 / g; the diameter is 2 μm, and it is formed by the accumulation of particles of 5...

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Abstract

The invention relates to a porous spherical lithium manganate cathode material and a preparation method thereof. The porous spherical lithium manganate cathode material is prepared by accumulating nanoscale particles of 30-400nm, wherein the diameters of sphere are 500nm -2Mum, and the average pore diameters of pores are 10-100nm. The preparation method comprises the following steps: (1) dissolving manganese salt in an aqueous solution, and adding hydrogen peroxide with a certain molecular weight; (2) under the condition of stirring, adding a sodium carbonate and sodium hydroxide aqueous solution into the solution, and centrifugally separating, washing and drying the obtained precipitates; (3) uniformly mixing the dried precipitates with lithium carbonate, then roasting for 3-10 hours at the temperature of 700 DEG C, and thus obtaining the porous lithium manganate material.

Description

technical field [0001] The invention relates to the preparation technology of lithium manganate cathode material. Background technique [0002] Spinel lithium manganese oxide (LiMn 2 o 4 ), has the essential advantages of low cost, low toxicity, safety, abundant raw materials and environmental friendliness, and is one of the most promising cathode materials for lithium-ion batteries for power vehicles and other large energy storage batteries. Development of LiMn with excellent performance 2 o 4 Cathode materials are of great significance to the progress, environmental protection and economic development of the entire lithium-ion battery industry. [0003] Currently, restricted spinel LiMn 2 o 4 The main reason for large-scale application is its poor cycle performance. Especially under high temperature conditions, its battery capacity decays extremely rapidly. Cause LiMn 2 o 4 The main factors of battery capacity attenuation are: the dissolution and erosion of manga...

Claims

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Application Information

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IPC IPC(8): H01M4/505C01G45/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/505H01M2004/028Y02E60/10
Inventor 李世友刘金良薛宇宙杜松丽李祥飞李玲霞李晓鹏净洁崔孝玲李永立
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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