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Lithium ion secondary battery anode and lithium ion secondary battery including the same

A secondary battery and lithium-ion technology, which is applied in the direction of secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of battery capacity and cycle life reduction, reduce heat generation, prevent loss of capacity, and prevent battery Effect of internal short circuit

Active Publication Date: 2009-07-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned defects in the prior art that the positive electrode reduces the capacity and cycle life of the battery, and provide a lithium-ion secondary battery that can improve the safety performance of the battery and ensure the battery capacity and cycle life. positive electrode

Method used

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Examples

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preparation example Construction

[0030] Various methods known in the art can be used for the preparation method of the positive electrode and the negative electrode.

[0031] The composition of the electrolyte solution is well known to those skilled in the art. Generally speaking, the electrolyte solution contains a non-aqueous solvent and an electrolyte dissolved in the non-aqueous solvent. The content of the electrolyte is generally 0.5-2.0 mol / l.

[0032]The kind of described non-aqueous solvent is well known to those skilled in the art, can use various known non-aqueous solvents, preferably use the mixed solvent of chain ester and cyclic acid ester; Described chain ester can be Dimethyl carbonate, diethyl carbonate, ethyl propyl carbonate, diphenyl carbonate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, dimethoxyethane, diethoxy ethane and its chain organic esters containing fluorine, sulfur and unsaturated bonds or a mixture thereof; the cyclic esters can be selected from ethylene ...

Embodiment 1

[0037] 1. Preparation of positive electrode

[0038] The positive electrode active material LiFePO 4 , PTC material powder (Shanghai Wei'an, with an average particle diameter of 5 microns and an operating temperature of 100°C), binder polytetrafluoroethylene (PVDF) and solvent N-methylpyrrolidone (NMP) with positive active material: PTC: The weight ratio of PVDF:NMP=80:20:2.5:85 was fully mixed evenly to obtain the slurry of the coating layer. The slurry of the obtained coating layer was coated on the current collector aluminum foil used for the positive electrode sheet to obtain a coating layer with a thickness of 20 microns, and then dried.

[0039] The positive electrode active material LiFePO 4 , Conductive agent acetylene black, binder polyvinylidene fluoride (PVDF) and solvent N-methylpyrrolidone (NMP) are fully mixed in a weight ratio of positive electrode active material: acetylene black: PVDF: NMP = 100:3:2.5:85 homogeneously, to prepare positive electrode slurry. ...

Embodiment 2

[0061] 1. Preparation of positive electrode

[0062] The cathode active material LiCoO 2 , PTC material powder (Shanghai Wei'an, with an average particle diameter of 20 microns and an operating temperature of 130°C), binder polyvinylidene fluoride (PVDF) and solvent N-methylpyrrolidone (NMP) with positive active material: PTC: The weight ratio of PVDF:NMP=80:20:2.5:85 was fully mixed evenly to obtain the slurry of the coating layer. The slurry of the obtained coating layer was coated on the current collector aluminum foil used for the positive electrode sheet to obtain a coating layer with a thickness of 20 microns, and then dried.

[0063] The cathode active material LiCoO 2 , Conductive agent acetylene black, binder polyvinylidene fluoride (PVDF) and solvent N-methylpyrrolidone (NMP) are fully mixed at a weight ratio of positive electrode active material: acetylene black: PVDF: NMP = 100:3:0.6:33 homogeneously, to prepare positive electrode slurry. Apply the positive ele...

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Abstract

The invention provides a positive electrode of a Li-ion secondary battery. The positive electrode comprises a current collector, and a coating layer and a positive electrode material layer on the current collector, wherein the coating layer contains a positive active material, a positive temperature coefficient material and an adhesive. The invention also provides a Li-ion secondary battery including the positive electrode. The positive electrode can improve the battery safety performance and can ensure no capacity loss of the battery.

Description

technical field [0001] The invention relates to a positive pole of a lithium ion secondary battery, and also relates to a lithium ion secondary battery comprising the positive pole of the lithium ion secondary battery. Background technique [0002] With the wide application of lithium-ion batteries, lithium-ion batteries are gradually developing in the direction of high capacity and small volume. Subsequently, the safety of batteries has become an extremely important quality standard, especially the external short circuit and overcharge of lithium-ion batteries. Safety performance is highly valued by producers and consumers. [0003] The external short circuit and overcharge of the battery sometimes cause explosion. The reason is mainly due to the exothermic reaction inside the battery under these circumstances. explode. If the exothermic reaction caused by short circuit and overcharge can be prevented or stopped, the safety performance of the battery can be greatly improv...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/58H01M4/48H01M4/62H01M10/40
CPCY02E60/12Y02E60/10
Inventor 司雷张伟清陆银峰廖细英
Owner BYD CO LTD
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