Positive electrode active material of lithium-ion battery, preparation method and application of positive electrode active material

A technology for positive active materials and lithium-ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of positive active materials such as sedimentation, sedimentation, and low density of conductive agents, so as to solve the problem of sedimentation, simple preparation process, The effect of excellent electrochemical performance

Active Publication Date: 2020-04-17
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]Aiming at the high true density of positive electrode active materials in the prior art, while the density of graphite and other carbon material conductive agents is low, in the actual industrial production process, it is very easy to causing subsidence problems
The method can avoid the use of maleimide-barbituric acid to solve the problem of positive electrode active material sedimentation

Method used

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  • Positive electrode active material of lithium-ion battery, preparation method and application of positive electrode active material
  • Positive electrode active material of lithium-ion battery, preparation method and application of positive electrode active material
  • Positive electrode active material of lithium-ion battery, preparation method and application of positive electrode active material

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Embodiment 1

[0048] A kind of preparation method of star polymer comprises the steps:

[0049] (1) be that 80% dodecyl primary amine ethanol solution (containing dodecyl primary amine 0.15mol) and acidic catalyst (85%H 3 PO 4 , 0.50g), warming up to 50 ° C, dropwise adding a mass fraction of 70% trimethylolpropane-three (3- aziridinyl propionate) ethanol solution (which contains trimethylolpropane-three (3 - aziridinyl propionate) 0.05mol), the dropwise addition time is 40min, after the dropwise addition is completed, the temperature is raised to 70°C for 6h;

[0050] (2) Adjust the above reaction solution to weak alkaline (pH=10) with NaOH, add dropwise an 80% aqueous solution of chloroethylsulfonic acid (containing 0.30 mol of sodium 2-chloroethylsulfonate), dropwise The time is 60 minutes, and the reaction is carried out at 70° C. for 16 hours; after the reaction, the insoluble matter is removed, the reaction liquid is concentrated, the product is purified by toluene column chromatogr...

Embodiment 2

[0052] A kind of preparation method of star polymer comprises the steps:

[0053] (1) be that 80% dodecyl primary amine ethanol solution (containing dodecyl primary amine 0.15mol) and acidic catalyst (85%H 3 PO 4 , 0.50g), warming up to 50 ° C, dropwise adding a mass fraction of 70% trimethylolpropane-three (3- aziridinyl propionate) ethanol solution (which contains trimethylolpropane-three (3 - aziridinyl propionate) 0.05mol), the dropwise addition time is 40min, after the dropwise addition is completed, the temperature is raised to 70°C for 6h;

[0054] (2) Adjust the above reaction solution to weak alkaline (pH=10) with NaOH, add dropwise 2-chloroethyl sodium phosphate aqueous solution (containing 0.30 mol of 2-chloroethyl sodium phosphate) with a mass fraction of 80%, dropwise The addition time was 60 minutes, and the reaction was carried out at 70°C for 16 hours; after the reaction, the insoluble matter was removed, the reaction liquid was concentrated, the product was ...

Embodiment 3

[0056] A kind of preparation method of star polymer comprises the steps:

[0057] (1) be that 80% dodecyl primary amine ethanol solution (containing dodecyl primary amine 0.15mol) and acidic catalyst (85%H 3 PO 4 , 0.50g), warming up to 50 ° C, dropwise adding a mass fraction of 70% trimethylolpropane-three (3- aziridinyl propionate) ethanol solution (which contains trimethylolpropane-three (3 - aziridinyl propionate), 0.05mol), the dropwise addition time is 40min, after the dropwise addition is completed, the temperature is raised to 70°C for 6h;

[0058] (2) The above reaction solution was adjusted to weakly alkaline (pH=10) with NaOH, and an aqueous solution of chloroethyl methyl ether (containing 0.30 mol of 2-chloroethyl methyl ether) with a mass fraction of 80% was added dropwise. After 60 minutes, react at 70°C for 16 hours; after the reaction, remove the insoluble matter, concentrate the reaction solution, purify and isolate the product by toluene column chromatograp...

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Abstract

The invention discloses a positive electrode active material of a lithium-ion battery, and a preparation method and application of the positive electrode active material. The method comprises the following steps: mixing a star-shaped polymer dispersion liquid with a positive electrode active substance to obtain a lithium-ion battery positive electrode active material, wherein the number of branched chains of star-shaped polymer in the star-shaped polymer dispersion liquid is more than or equal to 3, and the number of C atoms in each branched chain is more than or equal to 10. The problems thatin the prior art, the true density of a positive electrode active material is high, the density of carbon materials such as graphite is low, and sedimentation is extremely likely to be caused in theactual industrial production process are solved. The invention develops a method for solving the settlement problem of the positive electrode active material without using maleimide-barbituric acid. The method is simple in process; and the prepared material has excellent electrochemical performance, and the lithium-ion battery prepared from the material has relatively high energy density and relatively high capacity retention ratio.

Description

technical field [0001] The invention belongs to the technical field of new energy lithium batteries, and in particular relates to a positive electrode active material of a lithium ion battery, a preparation method and an application thereof. Background technique [0002] The lithium-ion battery system was researched and developed by Asahi Chemicals in the early 1980s, and was commercialized by Sony in 1990. At first, it produced 14500 and 20500 lithium-ion batteries for mobile phone power for Kyocera. Compared with traditional nickel-cadmium (Ni-Cd) and nickel-metal hydride (Ni-MH) batteries, lithium-ion batteries have a higher volume ratio Energy and mass versus energy. [0003] Existing lithium-ion batteries are mainly composed of a positive electrode, a negative electrode, and an electrolyte or an electrolyte. Among them, the positive electrode material is mainly composed of a positive electrode active material, a conductive agent, a lithium salt and a binder, and the po...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M4/1391
CPCH01M4/622H01M10/0525H01M4/1391Y02E60/10
Inventor 李峥冯玉川何泓材周柯王丹丹杨帆南策文
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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