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Positive electrode material and preparation method and application thereof

A technology of positive electrode materials and positive electrode active materials, which is applied in the field of positive electrode materials and its preparation, can solve problems such as battery capacity decay and battery swelling, and achieve less side reactions, good electrical conductivity and ion conductivity, good structural stability and chemical stability. The effect of stability

Pending Publication Date: 2022-04-12
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0002] At present, the positive electrode materials used in power batteries mainly include lithium iron phosphate, nickel-cobalt-manganese ternary material (NCM) or nickel-cobalt-aluminum ternary material (NCA). However, the high activity of high-priced nickel in high-nickel materials will lead to rapid decline in battery capacity, battery swelling, and a series of safety problems at the same time. Therefore, high-nickel cathode materials still need to be further improved

Method used

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  • Positive electrode material and preparation method and application thereof

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Effect test

Embodiment 1

[0044] Preparation of the positive electrode sheet: the polyethylene glycol diallyl ester of 5g of polyethylene glycol methyl ether acrylate, AIBN (0.005g, azobisisobutyronitrile), calcium zeolite of 12g; the TiF of 97.3g 4 ethanol solution; 3g of superconducting carbon black (super-P) (wherein, cross-linked polymer, TiOF 2 The mass ratio to the conductive agent is 17:80:3); 4Kg of NCM811 is dispersed in 1Kg of NMP (N-methylpyrrolidone), heated to 150°C while stirring continuously, and reacted for 15h, and the dispersion is cooled to After room temperature, add 0.104Kg of PVDF (polyvinylidene fluoride) and 0.04Kg of carbon nanotubes in sequence, and make positive electrode sheets according to the current commercial battery manufacturing process.

[0045] Preparation of negative electrode sheet: disperse 2.8Kg graphite, 0.04Kg CMC (sodium carboxymethyl cellulose), 0.058Kg SBR (styrene-butadiene rubber), 0.015Kg Super-P (superconducting graphite) in 2.5Kg deionized water , acco...

Embodiment 2

[0048] The difference with embodiment 1 is:

[0049] The preparation of the positive plate: the polyethylene glycol methyl ether acrylate of 6g, the polyethylene glycol diallyl ether of 2.5g, AIBN (0.002g), calcium zeolite; The TiF of 49g 4 ethanol solution; 1.5g of super-P (wherein, cross-linked polymer, TiOF 2 The mass ratio of the conductive agent to the conductive agent is 17:80:3); 4Kg of NCM811 is dispersed in 1Kg of NMP, heated to 150°C while stirring continuously, reacted for 15h, and stirred continuously until the dispersion is cooled to room temperature, then add 0.104Kg PVDF and 0.04Kg carbon nanotubes are used to make positive plates according to the current commercial battery manufacturing process.

Embodiment 3

[0051] The difference with embodiment 1 is:

[0052] The preparation of positive plate: the polyethylene glycol methyl ether acrylate of 6g, the polyethylene glycol diallyl ether of 2.5g, AIBN (0.002g), calcium zeolite; The TiF of 74g 4 ethanol solution; 1.4g of carbon nanotubes (wherein, cross-linked polymer, TiOF 2 The mass ratio of the conductive agent to the conductive agent is 12:86:2); 4Kg of NCM811 is dispersed in 1Kg of NMP, heated to 150°C while stirring continuously, reacted for 15h, and stirred continuously until the dispersion is cooled to room temperature, then add 0.104Kg PVDF, 0.04Kg of carbon nanotubes, according to the current commercial battery manufacturing process to make the positive sheet.

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Abstract

The invention discloses a positive electrode material and a preparation method and application thereof. The positive electrode material comprises a positive electrode active material and a cross-linked polymer / TiOF2 / conductive agent composite coating layer formed on the surface of the positive electrode active material. The positive electrode material not only has good structural stability and chemical stability, but also has relatively good ionic conductivity and electronic conductivity, and when the positive electrode material is applied to a battery, not only can the safety performance of the battery be remarkably improved, but also the capacity and the cycle performance of the battery can be improved on the basis of not influencing the rate capability of the battery.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to positive electrode materials and their preparation methods and applications. Background technique [0002] At present, the positive electrode materials used in power batteries mainly include lithium iron phosphate, nickel-cobalt-manganese ternary material (NCM) or nickel-cobalt-aluminum ternary material (NCA). However, the high activity of high-priced nickel in high-nickel materials will lead to rapid decline in battery capacity, battery swelling, and a series of safety problems. Therefore, high-nickel cathode materials still need to be further improved. Contents of the invention [0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to propose a positive electrode material and its preparation method and application. The positive electrode material not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
Inventor 黄荣刚张茉莉吕豪杰平丽娜齐士博
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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