Preparation method of polymer coated lithium ion battery electrode material

An electrode material and ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unsatisfactory coating effect, poor stability of conductive polymers, etc., to achieve inhibition of active lithium consumption, chemical and electrochemical stability Good performance and low impedance

Inactive Publication Date: 2017-06-13
JIANGSU DAOYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past, people's research work on polymer coatings mainly focused on the research on the coating of conductive polymers such as polythiophene and polypyrrole. Although these conductive polymer coatings can also provide certain functions for materials, conductive polymer The stability of itself is poor, and it is easy to decompose itself during the battery charge and discharge cycle, so the coating effect is not ideal

Method used

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  • Preparation method of polymer coated lithium ion battery electrode material
  • Preparation method of polymer coated lithium ion battery electrode material
  • Preparation method of polymer coated lithium ion battery electrode material

Examples

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preparation example Construction

[0021] The preparation method of the polymer-coated lithium-ion battery electrode material of the present invention comprises the following steps: (a) dissolving fluorine-containing or chlorine-containing polyolefin in an organic solvent to form a polymer solution; (b) immersing the inorganic electrode material in the (c) heat-treat the product of step (b) under vacuum or inert gas conditions, and the heat-treatment temperature is 100-220°C. The polymer polymer is coated on the surface of the lithium-ion battery electrode material by the liquid phase impregnation method, and a thin and dense polymer coating layer is formed on the surface of the material. After heat treatment at an appropriate temperature, the coating layer is in the conventional It is insoluble in the slurry dispersant (water and N-methylpyrrolidone) and will not be destroyed in the subsequent slurrying process; the polymer coating helps to release the inner electrode material due to volume expansion and contra...

Embodiment 1

[0025] The present embodiment provides a kind of preparation method of polymer-coated lithium-ion battery electrode material, and it comprises the following steps:

[0026] (a) Dissolve 5g of PVF in 95g of N, N dimethylformamide, heat and stir to make a concentration of 5wt% PVF solution;

[0027] (b) Add 10g lithium nickel manganese oxide powder to the above solution, utilize high-speed mechanical stirring to make the material completely soaked in the solution, and filter and separate the lithium nickel manganese oxide material;

[0028] (c) then placed in a vacuum oven, dried at 140° C. for 12 hours, to remove the residual solvent component of step (b), and at the same time make the coating layer closely contact with the surface of the active material;

[0029] (d) Repeat step (b) and step (c) once each;

[0030] The SEM image and EDX image of the coated lithium nickel manganese oxide material are as follows respectively figure 1 and figure 2 As shown, it can be seen tha...

Embodiment 2

[0033] This embodiment provides a preparation method of a polymer-coated lithium-ion battery electrode material. Its preparation steps are basically the same as those in Example 1, except that the concentration of the polymer used is 1 wt%, so that the coating layer The mass percentage is about 0.5%.

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Abstract

The invention relates to a preparation method of a polymer coated lithium ion battery electrode material. The method comprises the steps as follows: (a) fluorine-containing or chlorine-containing polyolefin is dissolved in an organic solvent to form a macromolecular solution; (b) an inorganic electrode material is immersed in the macromolecular solution, and filtration and drying are performed after stirring; (c) a product in step (b) is subjected to heat treatment under the vacuum or inert gas condition at the temperature of 100-220 DEG C. The surface of the lithium ion battery electrode material is coated with polymer macromolecules with a liquid phase impregnation method, one thin and compact polymer coating layer is formed on the surface of the material, and after being subjected to heat treatment at proper temperatures, the coating layer does not dissolve in conventional slurry dispersing agents (water and N-methyl pyrrolidone) and cannot be damaged in the following slurry making process; the polymer coating layer contributes to release of internal stress produced by volume expansion and contraction of the electrode material, and the problems of electrode active substance particle powdering and active substance loss are solved.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a lithium-ion battery electrode material, in particular to a preparation method of a polymer-coated lithium-ion battery electrode material. Background technique [0002] Active lithium storage materials are the key and core of lithium-ion batteries. The surface protection of active lithium storage materials is an effective way to protect the structure of electrode materials, improve the cycle stability and safety performance of lithium-ion batteries, and develop high-performance, long-life lithium-ion batteries. important way. In fact, the vast majority of lithium-ion battery active lithium storage materials (including positive electrode materials and negative electrode materials), such as graphite negative electrode materials, silicon negative electrode materials, ternary positive electrode materials, 5V-level lithium nickel manganese oxide positive electrode materials, etc. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 郑洪河刘尉杰石强郑雪莹朱国斌曲群婷
Owner JIANGSU DAOYING TECH CO LTD
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