Anode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrode manufacturing, active material electrodes, etc., can solve the problems of high AC internal resistance, poor cycle performance, and easy freezing of positive electrode slurry to achieve AC internal The effect of improving resistance and cycle performance

Active Publication Date: 2010-02-03
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since lithium nickel cobalt oxide is easier to absorb water than other positive electrode materials, the positive electrode slurry is prone to freezing during the battery manufacturing process. The battery made of this positive electrode slurry has high AC internal resistance and poor cycle performance.
This has become one of the main reasons hindering the large-scale application of lithium nickel cobalt oxide in lithium-ion batteries.

Method used

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  • Anode material of lithium ion battery
  • Anode material of lithium ion battery
  • Anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The positive electrode active material is lithium nickel cobaltate and lithium manganate (lithium manganate is the second active material), the carboxylic acid compound is malonic acid, the silane compound is methyltrioxymethylsilane, and the solvent is N-methyl arsenic Rolidone (NMP). The conductive agent used to prepare the positive electrode slurry is conductive carbon black SP, and the binder is polyvinylidene fluoride (PVDF).

[0032] The weight ratio is: lithium nickel cobaltate: lithium manganate: SP: PVDF: NMP: malonic acid: methyltrioxymethylsilane = 100:60:4.5:4.5:60:2:2.

[0033] Mix PVDF and 70% solvent in an egg beater and stir for 90 minutes, then add conductive agent SP and continue stirring for 90 minutes to complete the preparation of the conductive adhesive.

[0034] Dry-mix the baked lithium nickel cobaltate and lithium manganate in a vacuum mixer at 15Hz revolution for 90 minutes; then add 20% solvent and stir for 60 minutes; dissolve malonic acid i...

Embodiment 2

[0037] The positive electrode active material is lithium nickel cobaltate and lithium cobaltate + lithium manganate (lithium cobaltate + lithium manganate is the second active material), the carboxylic acid compound is oxalic acid, the silane compound is tetramethoxysilane, and the solvent It is diethyl carbonate (DEC). The conductive agent used to prepare the positive electrode slurry is conductive carbon black SP, and the binder is polyvinylidene fluoride (PVDF).

[0038] The weight ratio is: lithium nickel cobaltate: lithium cobaltate + lithium manganate: SP: PVDF: DEC: oxalic acid: tetramethoxysilane = 40:60:5:5:30:0.01:0.01.

[0039] Mix PVDF and 50% solvent in an egg beater and stir for 90 minutes, then add conductive agent SP and continue stirring for 90 minutes to complete the preparation of the conductive adhesive.

[0040] Dry-mix the baked lithium nickel cobaltate, lithium cobaltate + lithium manganate in a vacuum mixer at 15Hz for 90 minutes; then add 40% solvent ...

Embodiment 3

[0043] The positive electrode active material is lithium nickel cobaltate, the carboxylic acid compound is propionic acid, the silane compound is methyltriacetoxysilane, and the solvent is methyl ethyl carbonate (EMC). The conductive agent used to prepare the positive electrode slurry is conductive carbon black SP, and the binder is polyvinylidene fluoride (PVDF).

[0044] The weight ratio is: lithium nickel cobaltate: SP: PVDF: EMC: propionic acid: methyltriacetoxysilane = 70:5:5:100:1.5:1.0.

[0045] Mix PVDF and 50% solvent in an egg beater and stir for 90 minutes, then add conductive agent SP and continue stirring for 90 minutes to complete the preparation of the conductive adhesive.

[0046] Dry-mix the baked lithium nickel cobaltate, lithium cobaltate + lithium manganate in a vacuum mixer at 15Hz revolution for 90 minutes; then add 40% solvent and stir for 60 minutes; dissolve propionic acid in 5% solvent and add Put it into a vacuum mixer, and the stirring time is 60 m...

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Abstract

The invention provides an anode material of a lithium ion battery, which comprises the following compositions in proportion by weight that: an anode active substance: a carboxylic acid compound: a silane compound in the ratio of 40-160: 0.01-2:0.01-2, wherein the anode active substance comprises lithium nickel cobalt oxide. The invention also provides a method for preparing the anode material of the lithium ion battery, which is to mix the anode active substance, the carboxylic acid compound and the silane compound, wherein the anode active substance comprises the lithium nickel cobalt oxide;and the weight proportion of the battery is that the anode active substance: the carboxylic acid compound: the silane compound is 40-160:0.01-2:0.01-2. The method adds the carboxylic acid compound and the silane compound into the anode active substance to modify the particle surface of the anode active substance by the carboxylic acid compound and the silane compound. A sizing agent prepared by the method can be easily screened, and is prevented from wrap frozen, and can remarkably improve the alternating current internal resistance and circulation performance of the prepared battery.

Description

【Technical field】 [0001] The invention relates to a battery manufacturing technology, in particular to a positive electrode material of a lithium ion battery with good AC internal resistance and cycle performance. 【Background technique】 [0002] Lithium Nickel Cobalt Oxide LiNi 1-x co x o 2 It is an emerging positive electrode material for lithium-ion batteries. Because its gram specific capacity is about 30% higher than that of the current lithium cobalt oxide, and its cost is lower than that of lithium cobalt oxide, it is expected to replace the expensive lithium cobalt oxide currently in use. positive electrode material. [0003] However, since lithium nickel cobalt oxide is easier to absorb water than other positive electrode materials, the positive electrode slurry is prone to freezing during the battery manufacturing process. The battery made of this positive electrode slurry has high AC internal resistance and poor cycle performance. This has become a major reason...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/48H01M4/60H01M4/04B01J19/00
CPCY02E60/12Y02E60/10
Inventor 滕鑫潘启明
Owner DALIAN CBAK POWER BATTERY CO LTD
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