Lithium ion battery negative electrode with positive temperature coefficient characteristic and preparation method thereof

A lithium-ion battery with a positive temperature coefficient technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as lithium-ion battery safety hazards, achieve the effect of inhibiting battery chemical reactions and improving safety

Inactive Publication Date: 2016-06-08
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-ion batteries have certain potential safety hazards, and their safety issues are currently one of the important factors restricting their application development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1, by weight, the component content is as follows: graphite: 88.5%, barium titanate: 3%, sodium carboxymethyl cellulose: 1.5%, styrene-butadiene latex: 7%.

Embodiment 2

[0009] Embodiment 2, by weight, the component content is as follows: graphite: 88%, barium titanate: 2.5%, sodium carboxymethyl cellulose: 1.5%, styrene-butadiene latex: 8%.

Embodiment 3

[0010] Embodiment 3, by weight, the component content is as follows: graphite: 87.5%, barium titanate: 2.5%, sodium carboxymethyl cellulose: 1.5%, styrene-butadiene latex: 8.5%.

[0011] In the above examples, the production method is as follows: bake graphite and barium titanate powder at 50°C to 60°C for 0.5h to 1h and then mix them evenly to obtain a dry powder mixture, using sodium carboxymethyl cellulose as a thickener, and The benzene latex is used as a binder, and the dry powder mixture is stirred and mixed with a thickener and a binder to make a slurry, which is coated on a copper foil to obtain a negative electrode of a lithium-ion battery with a positive temperature coefficient characteristic.

[0012] After the 18650 lithium-ion battery adopts the above-mentioned negative electrode of the lithium-ion battery with positive temperature coefficient characteristics, after short-circuit, acupuncture, extrusion and other safety tests, the battery is non-flammable and non-e...

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Abstract

The invention discloses a lithium ion battery negative electrode with positive temperature coefficient characteristic and a preparation method thereof. The negative electrode comprises the following components by weight: 85%-90% of graphite, 2%-4% of barium titanate, 1%-2% of carboxymethylcellulose sodium and 5%-9% of styrene-butadiene latex. A preparation method of the negative electrode material is as below: baking graphite and barium titanate powder at 50-60 DEG C for 0.5-1 h; then uniformly mixing to obtain a mixture of dry powders; mixing the mixture of dry powders with a thickener of sodium carboxymethyl cellulose and a binder of styrene-butadiene latex to form a slurry; coating copper foil with the slurry to obtain the lithium-ion battery negative electrode with positive temperature coefficient characteristic. The lithium-ion battery negative electrode with positive temperature coefficient characteristic prepared by the invention can substantially improve the security of lithium ionbattery.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode and a preparation method thereof, belonging to the field of lithium ion batteries. Background technique [0002] Lithium-ion battery is the latest type of chemical power source at present, suitable for occasions requiring light weight, small size and frequent use of the power source. However, there are certain safety hazards in lithium-ion batteries, and its safety problem is one of the important factors restricting its application and development. The safety of lithium-ion batteries is related to its structural form and electrochemical system. The battery has a high energy density. Under short-circuit, acupuncture, extrusion and other abuse conditions, a violent electrochemical reaction occurs inside, and the chemical energy is converted into Thermal energy, the temperature of the battery rises sharply, and the electrode, electrolyte and other materials have side reactions due to overh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62
CPCH01M4/13H01M4/139H01M4/624Y02E60/10
Inventor 钱顺友张泽军王庆杰陈艳秋万伟华赵洪楷余新喜杨中发
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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