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Compound anode material used for lithium ion battery, preparation method of compound anode material, and lithium ion battery

A composite positive electrode material and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited material performance improvement, achieve the effects of improving the contact interface, improving safety, and suppressing side reactions

Active Publication Date: 2017-02-15
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-mentioned deficiencies in the prior art, the object of the present invention is to provide a composite positive electrode material for a lithium ion battery and a preparation method thereof and a lithium ion battery, aiming at solving the problem of existing ternary materials made of lithium iron phosphate and lithium manganate. Mixed material system, the problem of limited improvement of material performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The solution was prepared according to the Ni:Co:Mn molar ratio of 1 / 3:1 / 3:1 / 3, and the precursor oxide was prepared by co-precipitation under the condition of pH=10. Follow M Li :(M Ni + M Co + M Mn ) = 2:1 ratio of lithium source and precursor oxide, after mixing evenly, sintering at 600°C for 8 hours to synthesize lithium-rich ternary materials. Prepare FePO by co-precipitating iron ferrous sulfate and diammonium hydrogen phosphate solution according to the ratio of phosphorus:iron element molar ratio of 1:1 under the condition of pH=9 4 . FePO 4 After more than three times of washing and filtering, and then washing with absolute ethanol, the lithium-rich ternary material and FePO 4 According to the molar ratio of 1:1, mix uniformly in ethanol medium, dry and grind uniformly to obtain mixed powder. Put the above mixed powder into a corundum boat, and sinter at 850°C for 8 hours under an Ar inert atmosphere; cool with the furnace to obtain the composite cathode...

Embodiment 2

[0056] The solution was prepared according to the Ni:Co:Mn molar ratio of 0.5:0.2:0.3, and the precursor oxide was prepared by co-precipitation under the condition of pH=11. According to the ratio of pH=1.2:1, the lithium source and the precursor oxide were mixed uniformly, and then sintered at 650°C for 7 hours to synthesize lithium-rich ternary materials. Prepare FePO by co-precipitating iron ferrous sulfate and diammonium hydrogen phosphate solution according to the ratio of phosphorus: iron molar ratio of 1:1 under the condition of pH=9.5 4 . FePO 4 After more than three times of washing and filtering, and then washing with absolute ethanol, the lithium-rich ternary material and FePO 4 According to the molar ratio of 1:0.2, mix uniformly in ethanol medium, dry and grind uniformly to obtain mixed powder. Put the above mixed powder into the corundum boat, under N 2 Under an inert atmosphere, sinter at a high temperature of 800°C for 12 hours; cool with the furnace to obt...

Embodiment 3

[0060] The solution was prepared according to the Ni:Co:Mn molar ratio of 0.8:0.1:0.1, and the precursor oxide was prepared by co-precipitation under the condition of pH=12. Follow M Li :(M Ni + M Co + M Mn ) = 1.5:1 ratio of lithium source and precursor oxide, after mixing evenly, sintering at 600°C for 8 hours to synthesize lithium-rich ternary materials. Prepare FePO by co-precipitating iron ferrous sulfate and diammonium hydrogen phosphate solution according to the ratio of phosphorus:iron element molar ratio of 1:1 under the condition of pH=9 4 . FePO 4 After more than three times of washing and filtering, and then washing with absolute ethanol, the lithium-rich ternary material and FePO 4 According to the molar ratio of 1:0.5, mix uniformly in ethanol medium, dry and grind uniformly to obtain mixed powder. Put the above mixed powder into the corundum boat, under N 2 Under an inert atmosphere, sinter at a high temperature of 850°C for 8 hours; cool with the furnac...

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Abstract

The invention discloses a compound anode material used for a lithium ion battery, a preparation method of the compound anode material, and a lithium ion battery. The preparation method comprises the following steps: according to a situation that the molar ratio of Ni to Co to Mn is equal to X to Y to Z, preparing solution, and carrying out coprecipitation to prepare precursor oxide under an alkaline condition; preparing an Li source and the precursor oxide; after the above materials are evenly mixed, carrying out high-temperature sintering to obtain an Li-rich ternary material; carrying out coprecipitation on a P source and an Fe source to prepare FePO4; preparing the Li-rich ternary material and the FePO4 according to a certain molar ratio, evenly mixing in a solvent, and evenly grinding after drying; sintering the above mixed powder at a high temperature; cooling with a furnace to obtain the compound anode material used for the lithium ion battery. According to a compound system of the ternary material and lithium iron phosphate, a contact interface for material compounding is effectively improved, and the synergistic effect of the compound material is better performed. Meanwhile, side reaction generated by the contact of the ternary material and electrolyte is inhibited, and the safety of the lithium ion battery is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a composite positive electrode material for lithium ion batteries, a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, the mainstream positive electrode materials of power lithium-ion batteries are nickel-cobalt lithium manganate ternary materials, lithium iron phosphate, etc. Compared with lithium iron phosphate power lithium-ion batteries, ternary material power lithium-ion batteries have their own advantages. High 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 the ternary material is poor. At an external temperature of about 200°C, it will decompose and release oxygen. Together with the flammable electrolyte and carbon materials in the battery, the heat generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/525H01M10/0525
CPCH01M4/362H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 刘立君宋翠环
Owner 深圳市鑫永丰科技有限公司
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