Conductive agent combined type lithium ion battery positive pole piece and manufacture method thereof

A technology for lithium-ion batteries and positive pole pieces, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low compaction density, low Coulombic efficiency, and easy agglomeration

Inactive Publication Date: 2016-12-07
APOWER ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While obtaining excellent rate and low-temperature discharge performance, there are disadvantages of low in

Method used

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  • Conductive agent combined type lithium ion battery positive pole piece and manufacture method thereof
  • Conductive agent combined type lithium ion battery positive pole piece and manufacture method thereof
  • Conductive agent combined type lithium ion battery positive pole piece and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A positive electrode sheet of a conductive agent combined lithium ion battery comprises a current collector and a positive coating film adhering to the current collector. The components of the positive coating film include a positive electrode active material, a conductive agent and a binding agent. The conductive agent is a combination of CB and CNTs. The positive electrode active material is lithium cobalt oxide. The binder is polyvinylidene fluoride. The solvent is N-methylpyrrolidone. The CNTs are single-walled carbon nanotubes. The CB is Super P.

[0036] The preparation method of the positive pole piece: Dissolve 8.7 grams of polyvinylidene fluoride (Solvay 5130, France) in about 150 grams of N-methylpyrrolidone solvent to prepare a binder solution; then add 122.2 grams of CNTs dispersion slurry (CNTs content 5%, Zhenjiang Tiannai) and 3.6 grams of Super P, mixed thoroughly; then 1000 grams of lithium cobaltate (Tianjin Bamo) was added to the above solution, f...

Embodiment 2

[0048] A positive electrode sheet of a conductive agent combined lithium ion battery comprises a current collector and a positive coating film adhering to the current collector. The components of the positive coating film include a positive electrode active material, a conductive agent and a binding agent. The conductive agent is a combination of CNTs and GNPs. The positive electrode active material is lithium nickel cobalt manganese oxide. The binder is polyvinylidene fluoride. The solvent is N-methylpyrrolidone. The CNTs are single-walled carbon nanotubes. The GNPs are bilayer graphene.

[0049] The preparation method of the positive pole piece: Dissolve 8.65 grams of polyvinylidene fluoride (Solvay 5130) in about 250 grams of N-methylpyrrolidone solvent to prepare a binder solution; then add 111.9 grams of CNTs dispersion slurry (CNTs content 5 %, Zhenjiang Tiannai) and 61.0 grams of GNPs dispersion slurry (GNPs content 5%, Ningbo Mexico), and mix well; then add 1000 gr...

Embodiment 3

[0061] A positive electrode sheet of a conductive agent combined lithium ion battery comprises a current collector and a positive coating film adhering to the current collector. The components of the positive coating film include a positive electrode active material, a conductive agent and a binding agent. The conductive agent is a combination of CB, CNTs and GNPs. The positive electrode active material is lithium nickel cobalt aluminate. The binder is polyvinylidene fluoride. The solvent is N-methylpyrrolidone. The CB is Super P. The CNTs are single-walled carbon nanotubes. The GNPs are multilayer graphene.

[0062] The preparation method of the positive pole piece: Dissolve 8.6 grams of polyvinylidene fluoride (Solvay 5130) in about 250 grams of N-methylpyrrolidone solvent to prepare a binder solution; then add 1.5 grams of Super P and 60.8 grams of CNTs dispersion slurry material (CNTs content 5%, Zhenjiang Tiannai), and 20.2 grams of GNPs dispersion slurry (GNPs conte...

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PUM

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Abstract

The invention discloses a conductive agent combined type lithium ion battery positive pole piece, which comprises a current collector and a positive pole film adhered to the current collector. The positive pole film comprises a positive pole active material, a conductive agent and a binding agent, wherein the conductive agent is a combination of CB and CNTs or CB and GNPs or CNTs and GNPs or CB, CNTs and GNPs. A manufacture method comprises the steps of (1) adding the binding agent into solvent and evenly stirring and mixing; (2) adding the conductive agent combination of two or three of CB, CNTs and GNPs into the solvent and evenly stirring and mixing; (3) adding the positive pole active material and evenly stirring and mixing to obtain positive pole slurry; (4) coating the positive pole slurry on the current collector and obtaining the lithium ion battery positive pole piece after roasting and rolling. The positive pole piece is high in energy density, low in expansion rate, high in coulombic efficiency and high in compaction.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a conductive agent combined type lithium ion battery positive pole piece and a manufacturing method thereof. Background technique [0002] Lithium-ion battery is an energy storage device with high energy density and voltage. This device needs to use two kinds of electrode materials. One is a pole piece composed of lithium-ion active materials, called the positive electrode, and the other electrode is composed of carbon materials. The pole piece is called the negative electrode, and then the two electrodes are separated by a PE or PP material separator, and the electrolyte uses a compound containing the above-mentioned lithium ions. During the charging and discharging process, lithium ions are inserted or extracted in the lattice of the positive electrode active material, and the carbon material of the corresponding electrode is extracted or inserted. During the process of inserting and e...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/136H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/131H01M4/136H01M4/36H01M4/364H01M4/505H01M4/525H01M4/58H01M4/621H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 陈俊涛余志王玉虎
Owner APOWER ELECTRONICS CO LTD
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