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Lithium ion cell, anode therefor and preparing method thereof

A technology for lithium ion batteries and positive electrodes is applied in the field of positive electrodes and their preparation, and can solve the problems of poor cycle performance and rate discharge performance of lithium ion batteries.

Active Publication Date: 2007-04-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of poor cycle performance and rate discharge performance of lithium ion batteries in the prior art, to provide a lithium ion battery with good cycle performance and rate discharge performance, and the positive electrode of the battery and their preparation method

Method used

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Examples

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Effect test

preparation example Construction

[0039] According to the preparation method of the positive electrode provided by the present invention, the electrode active material, the conductive agent and the binder are added to the solvent, mixed to form a slurry, and then the slurry mixed with the dispersant is coated and / or filled in the On the current collector, dry, calendered or not calendered, wherein a dispersant is also added when the electrode active material, the conductive agent and the binder are mixed with the solvent. The dispersant can be added at any time, as can be added before the electrode active material, the conductive agent and the binding agent are added to the solvent, can be added simultaneously with the electrode active material, the conductive agent and the binding agent or when the electrode is added One or more of the active material, conductive agent and binder are added to the solvent and then added; the dispersant can be added alone or mixed with the conductive agent. Preferably, after th...

Embodiment 1

[0052] This example illustrates the lithium ion battery provided by the present invention, its positive electrode and their preparation method.

[0053] (1) Preparation of positive electrode

[0054] 90 grams of polyvinylidene fluoride are dissolved in 1350 grams of NMP, then add 30 grams of carbon black (the commodity of Ketian company, the trade name is ECP600JD, and carbon black particle diameter is 0.03 micron, and specific surface area is 1400 meters 2 / gram, DBP oil absorption 500 milliliters / 100 grams) and the mixture of 1.5 grams of polyvinylpyrrolidone (Shanghai Waytone Material Co., Ltd., PVP K25, number average molecular weight 34000) and 3000 grams of positive electrode active ingredient LiCoO 2 , and stirred in a blender to form a uniform positive electrode slurry.

[0055] The slurry was uniformly coated on an aluminum foil, then dried at 125° C., rolled, and cut to obtain a positive electrode with a size of 375×43.5 mm, which contained 6.1 grams of positive el...

Embodiment 2

[0062] This example illustrates the lithium ion battery provided by the present invention, its positive electrode and their preparation method.

[0063] (1) Preparation of positive electrode

[0064] 90 grams of polyvinylidene fluoride are dissolved in 1350 grams of NMP, then add 9 grams of carbon black (the product of Ketian company, the trade name is ECP, and the carbon black particle diameter is 0.04 micron, and specific surface area is 800 meters 2 / gram, DBP oil absorption 360 milliliters / 100 grams) and the mixture of 0.45 gram polyvinylpyrrolidone (Shanghai Waytone Material Co., Ltd., PVP K17, number average molecular weight 8000) and 3000 gram positive active ingredient LiCoO 2 , and stirred in a blender to form a uniform positive electrode slurry.

[0065] The slurry was evenly coated on an aluminum foil, then dried at 125° C., rolled, and cut to obtain a positive electrode with a size of 375×43.5 mm, which contained 6.1 grams of positive electrode material.

[0066...

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Abstract

The invention is an Li ion battery anode, comprising collector and coated and / or filled anode material on the collector, where the anode material comprises anode active matter, conducting agent and adhesive, the adhesive contains charcoal black which has a specific surface area above 500m2 / g obtained by nitrogen absorption, where the anode material also comprises dispersant. And a Li ion battery using the anode has good circulating performance and multiplying discharging performance.

Description

technical field [0001] The present invention relates to a battery and its positive pole and their preparation method, more specifically to a lithium ion battery and its positive pole and their preparation method. Background technique [0002] Lithium-ion battery mainly comprises pole core and non-aqueous electrolyte, and described pole core and non-aqueous electrolyte are sealed in the battery case, and described pole core comprises battery electrode and diaphragm, and described battery electrode comprises positive pole and negative pole, and described battery Electrode comprises current collector and coating and / or is filled in the electrode material on current collector, and described positive electrode material comprises positive electrode active material, conductive agent and binder; Negative electrode material comprises negative electrode active material and binder, can also Includes conductive agent. The preparation method of the battery electrode includes coating and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/62H01M4/04H01M10/40H01M10/38
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰孙华军
Owner BYD CO LTD
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