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Positive electrode material and preparation method and application thereof

A positive electrode material and positive electrode technology, applied in the field of positive electrode material and its preparation, can solve the problems of increased impedance of positive electrode sheet, decreased battery cycle performance, poor electrical conductivity, etc., to reduce gas production, improve cyclability and safety performance, and reduce side effects. the effect of the reaction

Pending Publication Date: 2022-03-25
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two oxygen-absorbing additives have poor conductivity, which will increase the impedance of the positive electrode sheet and decrease the cycle performance of the battery.

Method used

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  • Positive electrode material and preparation method and application thereof

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preparation example Construction

[0047] According to another aspect of the present invention, the present invention is also a method for preparing the positive electrode material, comprising the following steps:

[0048] Mix the polyethylenedioxythiophene-polystyrenesulfonic acid dispersion and dopamine hydrochloride to obtain a coating solution; mix the coating solution with the positive electrode base material under heating conditions to obtain a coated material; The coated material is heat-treated.

[0049] The method of the invention is simple and easy, and the new groups generated by the heat-treated dopamine can be combined with oxygen free radicals, thereby inhibiting the release of oxygen from the positive electrode material and improving the safety performance of the battery.

[0050] In one embodiment, the mass ratio of dopamine hydrochloride to polyvinylthiophene-polystyrenesulfonic acid is 1:(10-20). In one embodiment, the mass ratio of dopamine hydrochloride and polyethylenethiophene-polystyrene...

Embodiment 1

[0064] A method for preparing a positive electrode material, comprising the steps of:

[0065] (1) Add 0.28 g of dopamine hydrochloride to 281 mL of polyoxyethylene thiophene-polystyrene sulfonic acid dispersion (solid content: 1.5%), and stir at room temperature for 1 hour to obtain a composite polymer coating solution;

[0066] (2) Take 500g LiNi 0.83 co 0.11 mn 0.06 o 2 Put the powder into the base of the fluidized bed reactor, assemble the fluidized bed machine, preheat at 90°C and feed high-temperature air; put the polydopamine coating liquid into the beaker, turn on the peristaltic pump to pass the coating liquid into the fluidized In the bed reactor, the high-pressure air inlet is opened at the same time so that the coating liquid is sprayed. At this time, the positive electrode powder and the coating liquid are reciprocated and dried in the fluidized bed reactor, and finally the coated material is obtained;

[0067](3) The coated material was treated at a high temp...

Embodiment 2

[0069] A preparation method of a positive electrode material, except that in step (2): preheating at 60° C. and passing high-temperature air flow, and step (3): high temperature treatment at 340° C. for 0.5 hour, other conditions are the same as in Example 1.

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Abstract

The invention relates to the technical field of batteries, in particular to a positive electrode material and a preparation method and application thereof. The positive electrode material comprises a positive electrode base material and a polymer coating layer coating part of the surface or the whole surface of the positive electrode base material, the polymer coating layer comprises a polymer formed by polyethylene dioxythiophene-polystyrene sulfonic acid sulfonic acid and dopamine. The composite polymer polyethylene dioxythiophene-polystyrolsulfon acid-dopamine is adopted as a coating layer of the positive electrode base material, so that the effect of delaying oxygen release of the positive electrode material is achieved, and the cycle performance and the safety performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode material and a preparation method and application thereof. Background technique [0002] High-energy-density lithium-ion batteries (LIBs) are key to advancing next-generation sustainable energy technologies. Oxygen-containing cathodes are the main components of high-voltage, high-energy-density lithium-ion batteries. Since graphite is used as the anode in most commercial Li-ion batteries, the electrochemical performance of the battery (such as energy density and operating voltage) is determined by the choice of cathode material. At present, the main technical route is to use high-nickel, high-voltage positive electrode materials, and the problem brought about by the increase in the high gram capacity of positive electrode materials is the decline in thermal stability. Under high temperature and high pressure, the positive electrode material decomposes, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/13H01M4/505H01M4/525H01M10/0525
CPCH01M4/604H01M4/505H01M4/525H01M4/13H01M10/0525Y02E60/10
Inventor 郑晓醒江卫军李子郯陈思贤任海朋杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD