Ternary composite material and preparation method thereof and lithium-ion battery

A lithium-ion battery, ternary material technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems that ternary materials are difficult to meet actual needs, poor safety, etc., to inhibit catalytic decomposition reactions, prevent explosions, slow down The effect of catalytic reaction

Inactive Publication Date: 2017-05-10
深圳市鑫永丰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a composite ternary material and its preparation method and lithium ion battery, aiming to solve the problems that the existing ternary materials are difficult to meet the actual needs and have poor safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] According to the molar ratio of vanadium source: oxalic acid: phosphorus source: lithium source: ethylene glycol: ethylenediamine, add ammonium meta-aluminate to a certain concentration of oxalic acid solution and stir to dissolve it in a molar ratio of 2:3:3:3:8:8 , Then add ammonium dihydrogen phosphate and lithium carbonate and mix well, add ternary nickel cobalt manganese 523 material according to the amount of N=0.9 and stir evenly, gradually add ethylene glycol and ethylenediamine dropwise, and react at 150℃ for 6h in the reactor , Suction filtration, washing to get the precursor 0.9 LiMn 2 O 4 / 0.1Li 3 V 2 (PO 4 ) 3 / C. The precursor 0.9 Li Ni 0.5 Co 0.2 Mn 0.3 O 2 / 0.1Li 3 V 2 (PO 4 ) 3 / C was dried for 8h under vacuum at 100℃. After drying, grind uniformly, and then put the powder obtained after grinding into the corundum boat. 2 Sintered at 830℃ for 12h. After the furnace is cooled to room temperature, the composite ternary material 0.9LiNi is obtained 0.5 Co ...

Embodiment 2

[0051] According to the molar ratio of vanadium source: oxalic acid: phosphorus source: lithium source: ethylene glycol: ethylenediamine, add ammonium meta-aluminate to a certain concentration of oxalic acid solution and stir to dissolve it in a molar ratio of 2:3:3:3:6:7 , Then add diammonium hydrogen phosphate and lithium hydroxide and mix well, add ternary nickel cobalt manganese 111 material according to the amount when N=0.8 and stir evenly, gradually add ethylene glycol and ethylene diamine dropwise, and react at 200 ℃ in the reactor 2h, suction filtration, washing to get the precursor 0.8LiMn 2 O 4 / 0.2Li 3 V 2 (PO 4 ) 3 / C. The precursor 0.8Li Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 / 0.2Li 3 V 2 (PO 4 ) 3 / C was dried under vacuum at 80°C for 10h. After drying, grind evenly, and then put the powder into the corundum boat, in the N 2 Medium, high temperature sintering at 860℃ for 8h. After the furnace is cooled to room temperature, the composite ternary material 0.8Li Ni is obtained 1...

Embodiment 3

[0055] According to the molar ratio of vanadium source: oxalic acid: phosphorus source: lithium source: ethylene glycol: ethylenediamine, the vanadium trichloride is added to a certain concentration of oxalic acid solution and stirred to dissolve it in a molar ratio of 2:3:3:3:9:10 , Then add ammonium dihydrogen phosphate and lithium hydroxide and mix well, add ternary nickel cobalt manganese 811 material according to the amount when N=0.7 and stir evenly, gradually add ethylene glycol and ethylene diamine dropwise, and react at 150 ℃ in the reactor 4h, suction filtration, washing to get the precursor 0.7 LiNi 0.8 Co 0.1 Mn 0.1 O 2 / 0.3Li 3 V 2 (PO 4 ) 3 / C. The precursor was dried under vacuum at 120°C for 6 hours. After drying, grind evenly, and then put the powder into the corundum boat, in the N 2 Sintering at 800℃ for 15h. After the furnace is cooled to room temperature, the composite ternary material 0.7 LiNi is obtained 0.8 Co 0.1 Mn 0.1 O 2 / 0.3Li 3 V 2 (PO 4 ) 3 / C.

...

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Abstract

The invention discloses a ternary composite material and a preparation method thereof and a lithium-ion battery. The method comprises the steps of adding a vanadium source to an oxalic acid solution, adding a phosphorus source and a lithium source, adding a ternary material for stirring evenly and then dropwise adding ethylene glycol and ethanediamine for reaction at 150-200 DEG C for 2-4 hours to obtain a precursor; carrying out vacuum drying on the precursor at 80-120 DEG C for 6-10 hours, grinding the precursor evenly and then sintering at 800-860 DEG C for 8-15 hours; and carrying out furnace cooling to obtain NLiNi<x>Co<y>Mn<z>O<2>/(1-N)Li<3>V<2>(PO<4>)<3>/C, wherein x+y+z is equal to 1 and N is smaller than 1 and greater than or equal to 0.5. A coating layer is formed on the surface of the ternary material, so that direct contact of the ternary material and an electrolyte can be blocked and catalytic decomposition of the ternary material on the electrolyte is inhibited. Catalytic reaction of the ternary material on the electrolyte is retarded by the coating layer, instantaneous accumulation of heat is relieved and a dangerous condition of the battery is inhibited.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a composite ternary material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the development of new energy vehicles, the application of high energy density batteries has become a hot spot for pursuit. Lithium nickel cobalt manganese oxide ternary materials are sought after for their high energy density and good cycle performance; and because of the high charge per unit mass, the weight of the vehicle is reduced, and the cruising range is correspondingly increased. [0003] However, the thermal stability of ternary materials is poor, and it is easy to cause "thermal runaway", which will deflagrate in a very short time, and there is a greater safety risk, which seriously hinders its wide application in the field of new energy. Only by solving the safety problems of ternary lithium-ion batteries can ternary lithium-ion batteries have better...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/5825H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 刘立君宋翠环
Owner 深圳市鑫永丰科技有限公司
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