Positive pole of Li-ion battery and the Li-ion battery

A lithium-ion battery and positive electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low specific capacity and poor cycle performance, and achieve the effects of increasing specific capacity, improving rate performance, and improving cycle performance

Inactive Publication Date: 2008-07-02
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of low specific capacity and poor cycle performance of existing lithium-ion batteries, and provide a positive electrode for lithium-ion batteries that can increase the specific capacity of lithium-ion batteries and improve cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the positive electrode can adopt conventional preparation methods. For example, mixing the positive electrode active material, the binder, the optional conductive agent and the solvent to form a slurry, coating and / or filling the slurry on the current collector, drying, calendering or not rolling to obtain the positive electrode.

[0025]Described solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO), tetrahydrofuran (THF) and water one or several. The amount of the solvent can make the paste have viscosity and fluidity, and can be coated on the current collector. Generally, based on 100 parts by weight of the positive electrode active material, the amount of the solvent is preferably 30-80 parts by weight, more preferably 35-60 parts by weight. Wherein, the methods and conditions of drying and calendering are well known to those skilled in the art and will not be r...

Embodiment 1

[0039] This example is used to prepare the lithium ion battery cathode provided by the present invention.

[0040] 100 parts by weight LiFePO 4 , 2 parts by weight of carboxyl-containing vinylidene fluoride polymer (obtained by the copolymerization of methacrylic acid monomer and vinylidene fluoride monomer with a weight ratio of 1:30, and the number average molecular weight is 8×10 5 -1×10 6 ), 1 part by weight of polyacrylonitrile (the number average molecular weight is 5×10 4 ~1×10 5 ) and 4 parts by weight of acetylene black were added to 60 parts by weight of NMP, and stirred evenly to obtain positive electrode slurry.

[0041] The positive electrode slurry is evenly coated on the aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode sheet A1 with a length of 480 mm, a width of 44 mm, and a thickness of 0.150 mm, which contains 5.5 grams of LiFePO 4 .

Embodiment 2

[0046] This example is used to prepare the lithium ion battery cathode provided by the present invention.

[0047] According to the same method as in Example 1, the positive electrode sheet A2 with a length of 480 mm, a width of 44 mm, and a thickness of 0.150 mm is obtained. The difference is that the positive electrode material is 100 parts by weight LiFePO 4 , 2 parts by weight of carbonyl-containing vinylidene fluoride polymer (obtained by the copolymerization of methyl methacrylate monomer and vinylidene fluoride monomer with a weight ratio of 1:100, and the number average molecular weight is 2×10 4 -1×10 5 ), 1 part by weight of polyacrylonitrile (the number average molecular weight is 5×10 4 ~1×10 5 ), 0.5 parts by weight polyvinylidene fluoride (the number average molecular weight is 6×10 5 ~2×10 6 ). Positive pole piece A2 contains 5.5 grams of LiFePO 4 .

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Abstract

The invention relates to an anode of a lithium ion battery, which comprises a current collector and an anode material on the current collector. The anode material contains an anode active material and a binding agent, wherein the binding agent comprises a first polymer and a second polymer. The first polymer contains fluorine with a functional group, and the second polymer contains at least a cell of acrylonitrile cell, a methylacrylonitrile cell, an acrylic acid ester cell and a methacrylic acid ester cell. The invention also provides the lithium ion battery containing the anode. The anode of the lithium ion battery provided by the invention can improve the specific capacity, rate performance and cycle performance of the battery.

Description

technical field [0001] The present invention relates to a positive pole of a battery and a battery comprising the positive pole, more particularly to a positive pole of a lithium ion battery and a lithium ion battery comprising the positive pole. Background technique [0002] As a chemical power source, a lithium-ion battery refers to a secondary battery that uses two compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode, and vice versa during discharge. Lithium-ion battery mainly comprises pole core and non-aqueous electrolytic solution, and described pole core and non-aqueous electrolyte are sealed in the battery housing, and described pole core comprises positive pole, negative pole and the separator between positive pole and negative pole, and described positive pole comprises A co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/48H01M10/40
CPCY02E60/122Y02E60/10
Inventor 沈晞高艺潘福中
Owner SHANGHAI BYD
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