Preparation method of high-rate lithium ion battery anode slurry

A lithium-ion battery, cathode slurry technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problem of difficult dispersion of mixed conductive agents, achieve low internal resistance, high energy density, and avoid agglomeration effects.

Active Publication Date: 2016-12-07
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of high-rate lithium-ion battery positive electrode slurry, which can effectively solve the problem that the mixed conductive agent is difficult to disperse

Method used

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  • Preparation method of high-rate lithium ion battery anode slurry
  • Preparation method of high-rate lithium ion battery anode slurry
  • Preparation method of high-rate lithium ion battery anode slurry

Examples

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Embodiment 1

[0028] In the preparation method of the high-rate lithium-ion battery cathode slurry in this embodiment, lithium iron phosphate is used as the cathode active material, single-walled carbon nanotubes and Super-p are used as conductive agents, polyvinylidene fluoride is used as a binder, and N-methyl fluoride is used as a binder. Pyrrolidone is the solvent, and the first four components are weighed according to the mass ratio of lithium iron phosphate: polyvinylidene fluoride: Super-p: single-wall carbon nanotube=93:4:2:1, and the preparation steps are as follows:

[0029] 1) Before slurry preparation, firstly, lithium iron phosphate, conductive agent Super-p and single-walled carbon nanotubes were dried at 115°C for 4h under nitrogen protection, and polyvinylidene fluoride was dried at 85°C for 8h under nitrogen protection. After drying, cool down naturally to below 40°C for use;

[0030] 2) Dissolve the polyvinylidene fluoride in N-methylpyrrolidone equivalent to 12 times its ...

Embodiment 2

[0038] In the preparation method of the positive electrode slurry for a high-rate lithium ion battery in this embodiment, lithium cobalt oxide is used as the positive electrode active material, double-walled carbon nanotubes and KS-6 are used as conductive agents, polyvinylidene fluoride is used as a binder, and N-methyl fluoride is used as a binder. Pyrrolidone is the solvent, and the first four components are weighed according to the mass ratio of lithium cobaltate: polyvinylidene fluoride: KS-6: double-walled carbon nanotubes=92.5:4.5:1.5:1.5, and the preparation steps are as follows:

[0039] 1) Before slurry preparation, firstly, lithium cobalt oxide, conductive agent KS-6 and double-walled carbon nanotubes were dried at 95°C for 4.3h under nitrogen protection, and polyvinylidene fluoride was dried at 80°C for 7h under nitrogen protection. , After drying, cool down naturally to below 40 °C for use;

[0040] 2) Dissolve polyvinylidene fluoride in N-methylpyrrolidone equiva...

Embodiment 3

[0048] In the preparation method of the high-rate lithium-ion battery positive electrode slurry in this embodiment, lithium manganate is used as the positive electrode active material, graphitized carbon nanotubes and Super-p are used as conductive agents, polyvinylidene fluoride is used as a binder, and N-methyl fluoride is used as a binder. Pyrrolidone is the solvent, and the first four components are weighed according to the mass ratio of lithium manganate: polyvinylidene fluoride: Super-p: graphitized carbon nanotube=93.7:2.8:2.5:1. The preparation steps are as follows:

[0049] 1) Before slurry preparation, firstly, lithium manganate, conductive agent Super-p and graphitized carbon nanotubes were dried under nitrogen protection at 110 °C for 4.8 h, and polyvinylidene fluoride was dried at 75 °C for 6.5 h under nitrogen protection. h, after drying, cool down to below 40°C naturally for use;

[0050] 2) Dissolve the polyvinylidene fluoride in N-methylpyrrolidone equivalent ...

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Abstract

The invention provides a preparation method of high-rate lithium ion battery anode slurry. The preparation method includes the steps of firstly, performing drying treatment on each component; secondly, dissolving an adhesive in a solvent, and stirring and dispersing to obtain an adhesive solution A; thirdly, taking one part of the adhesive solution A, adding one part of an conductive agent into the part of the adhesive solution A, and stirring and dispersing to obtain slurry B; fourthly, adding the other part of the conductive agent and the rest of the adhesive solution into the slurry B, and stirring and dispersing to obtain slurry C; fifthly, adding anode active materials into the slurry C in twice, stirring and dispersing, using a solvent to perform viscosity regulation, filtering, and performing vacuum defoaming to obtain the high-rate lithium ion battery anode slurry. The high-rate lithium ion battery anode slurry has the advantages that after a current collector is coated with the high-rate lithium ion battery anode slurry, the components of the high-rate lithium ion battery anode slurry are good in dispersity, electrochemical performance consistency between single batteries is guaranteed, and the rate capability of the batteries can be brought into play favorably; a lithium ion battery prepared by the slurry is low in internal resistance, high in energy density and good in circulation performance.

Description

technical field [0001] The invention relates to a preparation method of a high-rate lithium ion battery positive electrode slurry, and belongs to the technical field of lithium ion batteries. Background technique [0002] In today's increasingly shortage of petroleum resources and increasingly serious environmental pollution, the harmonious development of energy, resources, environment and human society has increasingly become the focus of social attention, exploring alternative energy sources for traditional petrochemical energy, realizing the development of harmless resource industries, seeking human and environment harmony is particularly urgent. Among them, compared with traditional secondary batteries lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, etc., lithium-ion batteries have high voltage, small size, long life, high energy density, good cycle performance, low self-discharge rate, and no memory. It is widely concerned by countries all ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/04H01M4/62H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/04H01M4/362H01M4/505H01M4/525H01M4/58H01M4/621H01M10/0525Y02E60/10
Inventor 王云辉白玲玲庞可可陈天振孙青山马佰瑞赵晓菲
Owner CALB CO LTD
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