Lithium battery positive electrode material and conductive additive

A technology of conductive additives and positive electrode materials, applied in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problems of harsh requirements, incomplete electrochemical performance, and high residual alkali content on the surface

Inactive Publication Date: 2018-07-10
ZHENJIANG YINENG NEW ENERGY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the currently commonly used positive electrode materials have high residual alkali on the surface and are sensitive to moisture, so the requirements for their storage environment are strict, especially for high-nickel materials.
At the same time, the dispersion of most cathode materials is not very good during slurry mixing, resulting in the inability to fully exert their electrochemical performance.

Method used

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  • Lithium battery positive electrode material and conductive additive
  • Lithium battery positive electrode material and conductive additive
  • Lithium battery positive electrode material and conductive additive

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preparation example Construction

[0028] The preparation method of the lithium battery described in the present invention comprises:

[0029] Weighing the positive electrode active material of the lithium battery and additives selected from fluorine-containing alkyl compounds and / or weak acids, grinding and mixing to obtain the lithium positive electrode material containing the additive;

[0030] Mix the additive-containing lithium battery positive electrode material with the conductive agent acetylene black and the binder polyvinylidene fluoride (PVdF) in a nitrogen-methylpyrrolidone (NMP) solvent to obtain a slurry, wherein the additive-containing lithium battery positive electrode material , The mass ratio of conductive agent and binder is 85:10:5;

[0031] Coat the uniformly mixed slurry on an aluminum foil, and dry it under vacuum at 120°C for 12 hours to obtain a positive electrode for a lithium battery;

[0032] Use the above positive electrode, metal lithium as negative electrode, 1mol / L lithium hexaf...

Embodiment 1

[0039] Embodiment 1: the preparation of the positive electrode piece that contains the positive electrode material of weak acid additive

[0040] Weigh 9.97g LiNi 0.8 co 0.1 mn 0.1 o 2 and 0.03 g of diethyl malonate were ground and mixed to obtain additive-containing positive electrode material T1.

[0041] Weigh 8.5g of positive electrode material T1, 1g of Super-p conductive agent, 0.5g of polyvinylidene fluoride (PVdF) and disperse it with nitrogen methylpyrrolidone (NMP), stir for 6h, coat the slurry on aluminum foil, and heat it in an oven at 60°C Dry for 4 hours, and then dry in a vacuum oven at 120° C. for 12 hours to obtain positive electrode sheet 2#.

Embodiment 2

[0042] Embodiment 2: Preparation of the positive electrode sheet of the positive electrode material containing weak acid additive

[0043] Weigh 9.9g LiNi 0.8 co 0.1 mn 0.1 o 2 and 0.1 g of acetic acid were ground and mixed to obtain the additive-containing positive electrode material T2.

[0044] Weigh 8.5g of positive electrode material T2, 1g of Super-p conductive agent, 0.5g of polyvinylidene fluoride (PVdF) and disperse it with nitrogen methylpyrrolidone (NMP), stir for 6h, coat the slurry on aluminum foil, and heat it in an oven at 60°C Dry for 4 hours, and then dry in a vacuum oven at 120° C. for 12 hours to obtain positive electrode sheet 3#.

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Abstract

The invention provides a lithium battery positive electrode material containing a fluorine-containing alkyl compound additive and / or a weak acid additive. The fluorine-containing alkyl compound additive has a very high chemical stability and maintains a good surface activity in a solvent. A small amount of the fluorine-containing alkyl compound additive is added to a positive electrode material inorder to reduce the surface tension of a solvent-based system, so the wetting property, the dispersing property, the leveling property and other surface properties of the positive electrode materialare enhanced, the diffusion of lithium is facilitated, and the rate performance is improved. The addition of the weak acid additive can reduce the amount of residual alkalis on the surface of the positive electrode material. Additionally, the fluorine-containing alkyl compound additive has hydrophobic properties, so the waterproof property of the positive electrode material is improved, the requirements for the humidity of the storage and use environment of the positive electrode material are reduced, and the cost is saved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular, the invention relates to a lithium battery cathode material and a conductive additive. Background technique [0002] Lithium batteries have the advantages of high energy density, high working voltage, and no memory effect in cycles. They are currently ideal chemical power sources and have been widely used in various portable electronic products and electric vehicles. Because the characteristics of lithium batteries are essentially determined by the performance of the electrode materials used in batteries, electrode materials, especially positive electrode materials, are the most important part in the development and research of lithium batteries. [0003] The materials used to make the positive electrode of lithium batteries are mainly LiCoO 2 , LiNiO 2 , LiMn 2 o 4 , nickel-cobalt-manganese ternary system and LiFePO 4 , where LiCoO 2 It has been commercialized and is current...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/624H01M10/0525H01M10/4235Y02E60/10
Inventor 王德宇刘孟李华
Owner ZHENJIANG YINENG NEW ENERGY MATERIAL TECH CO LTD
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