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Modification method of lithium-enriched manganese-based solid solution lithium battery cathode material

A lithium-rich manganese-based, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as affecting the discharge specific capacity of the material, and achieve the advantages of transmission, controllable thickness of the coating, and simple preparation method. Effect

Inactive Publication Date: 2014-08-13
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional modification methods, such as surface coating and doping, can only unilaterally improve the rate performance or cycle performance of lithium-rich manganese-based solid solution multi-component cathode materials, and also greatly affect the specific discharge capacity of the material.

Method used

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  • Modification method of lithium-enriched manganese-based solid solution lithium battery cathode material
  • Modification method of lithium-enriched manganese-based solid solution lithium battery cathode material
  • Modification method of lithium-enriched manganese-based solid solution lithium battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment is 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The preparation method of coating 5% polypyrrole lithium battery cathode material specifically comprises the following steps:

[0033] (1) Weigh NiSO according to the molar ratio of Ni: Co: Mn=1: 1: 4 4 、CoSO 4 , MnSO 4 , to obtain a metal salt mixture after mixing;

[0034] (2) Dissolve the above metal salt mixture in deionized water to prepare 200 mL of a solution with a total metal ion concentration of 1mol / L;

[0035] (3) Prepare 200 mL of sodium carbonate solution with a concentration of 1 mol / L, add ammonia water as a complexing agent, and the concentration of ammonia water is 0.1 mol / L;

[0036] (4) Continuously input the metal salt solution and sodium carbonate solution into the reaction flask with a peristaltic pump, the flow rate is 5mL / min, the water bath temperature of the reactor is 55°C, the slurry pH=7-8, and the stirring speed is 600 rpm;

[0037] (5) After the reaction, the preci...

Embodiment 2

[0043] This embodiment is 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The preparation method of coated 2% polypyrrole lithium battery cathode material specifically comprises the following steps:

[0044] Steps (1)-(6) are the same as in Example 1;

[0045] (7) Weigh 10 g of the prepared 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 and 0.2g of pyrrole monomer are dispersed in 100 mL of perchloric acid aqueous solution with a concentration of 0.1mol / L, and the ultrasonic dispersion is uniform;

[0046] (8) According to the molar ratio of ferric p-toluenesulfonate to the above-mentioned pyrrole as 1:1, weigh 2 g of ferric p-toluenesulfonate to make 100 mL ferric p-toluenesulfonate perchloric acid solution with a concentration of 0.1mol / L, Then this p-toluenesulfonate ferric perchloric acid solution is added in the solution of the above-mentioned step (7), stirred and reacted for 8h;

[0047] (9) After the reaction product was filtered, centrifuged, washed, and d...

Embodiment 3

[0049] This embodiment is 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The preparation method of coating 7% polyaniline lithium battery cathode material specifically comprises the following steps:

[0050] Steps (1)-(6) are the same as in Example 1;

[0051] (7) Weigh 10 g of the prepared 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 and 0.7g of aniline monomer were dispersed in 100 mL of hydrochloric acid aqueous solution with a concentration of 0.2mol / L, and the ultrasonic dispersion was uniform;

[0052] (8) According to the molar ratio of ammonium persulfate to the above-mentioned aniline as 1:2, weigh 0.86 g of ammonium persulfate to prepare 100 mL of ammonium persulfate hydrochloric acid solution with a concentration of 0.2mol / L, and then dissolve the hydrochloric acid of ammonium persulfate The solution was added to the solution of the above step (7), and the reaction was stirred for 12h;

[0053] (9) After the reaction product was filtered, c...

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Abstract

The invention relates to a modification method of a lithium-enriched manganese-based solid solution lithium battery cathode material. The modification method comprises following steps: (1) prepared Li2MnO3-LiMO2 (M is used for representing at least one selected from Ni, Co, and Mn), and a conductive polymer monomer are uniformly dispersed in an acid solution via ultrasonic dispersion so as to obtain a mixed solution; (2) an oxidizing agent acid solution with a certain concentration is prepared, and is added into the mixed solution, and an obtained mixture is stirred and reacted; and (3) an obtained product is subjected to pumping filtration, centrifugation, washing, and drying so as to obtain the lithium-enriched manganese-based solid solution lithium battery cathode material coated with the conductive polymer. The modification method is simple; the thickness of the coating is controllable; large scale production can be realized; first time irreversible capacity loss of lithium-enriched cathode material is reduced; rate capability of the lithium-enriched manganese-based solid solution lithium battery cathode material is improved; demands on high power lithium ion batteries are satisfied; and the flexible conductive polymer is capable of increasing compacted density of the lithium-enriched manganese-based solid solution lithium battery cathode material, and reducing destroy on the lithium-enriched manganese-based solid solution lithium battery cathode material caused by compacting processes.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a modification method of a lithium-rich manganese-based solid solution lithium battery cathode material. Background technique [0002] With the increasing demand for energy and the deepening awareness of the importance of sustainable social and economic development, lithium-ion batteries, which are characterized by environmental protection, high efficiency and high energy, have attracted more and more attention. The currently developed cathode materials for lithium-ion batteries mainly include layered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ), spinel lithium manganese oxide (LiMn 2 o 4 ), lithium iron phosphate (LiFePO 4 ), and lithium nickel cobalt oxide (LiNi x -Co y o 2 ), lithium nickel cobalt manganese oxide (LiNi x co y mn z o 2 ) and other lithium-containing oxides, the specific capacity...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/1399
CPCY02E60/122H01M4/505H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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