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Method for manufacturing lithium primary battery

A battery and cell technology, applied in the field of lithium primary battery preparation, can solve problems such as harsh environmental requirements, and achieve the effects of reducing environmental requirements, reducing manufacturing costs, and improving safety factor

Inactive Publication Date: 2020-09-29
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the traditional lithium primary battery has extremely strict requirements on the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of positive electrode sheet: Mix lithium iron phosphate powder, binder polyvinylidene fluoride (PVDF), conductive additive carbon black and carbon nanotubes according to the mass ratio of 92:4:4, and then disperse them in organic solvent N,N- Dimethylpyrrolidone (NMP) is stirred until uniform to obtain positive electrode slurry; the positive electrode slurry is coated on aluminum foil, rolled and then cut into positive electrode sheets of batteries. After the positive electrode sheet is dried and completely removed of moisture therein, it is placed in an environment with a relative humidity of 30% to dry before use.

[0026] Preparation of the negative electrode sheet: the negative electrode sheet is a 50 μm bare copper foil.

[0027] Assembling: Assembling the cells in a conventional environment, inserting a porous polyethylene and polypropylene composite film that separates the positive and negative electrodes between the negative and positive electrodes, ...

Embodiment 2

[0029] Preparation of the positive electrode sheet: firstly mix the lithium iron phosphate powder, the binder polytetrafluoroethylene, the conductive additive carbon black and graphene according to the mass ratio of 94:3:3, and then disperse them in the organic solvent N,N-dimethyl Pyrrolidone (NMP) was stirred until uniform to obtain positive electrode slurry; the positive electrode slurry was coated on aluminum foil, rolled and cut into positive electrode sheets for batteries. After the positive electrode sheet is dried and completely removed of moisture therein, it is placed in an environment with a relative humidity of 30% to dry before use.

[0030] Preparation of the negative electrode sheet: the negative electrode sheet is a 50 μm nickel foil.

[0031] Assembling: Assembling the battery cell under normal circumstances, inserting a porous polyimide film that separates the positive and negative electrodes between the negative electrode and the positive electrode, winding ...

Embodiment 3

[0033] Preparation of positive electrode sheet: Mix lithium iron phosphate powder, binder polyurethane, conductive additive carbon nanotubes and graphene according to the mass ratio of 96:2:2, and then disperse them in organic solvent N,N-dimethylpyrrolidone (NMP ) and stir until uniform, to obtain the positive electrode slurry; apply the positive electrode slurry on the aluminum foil, and cut it into the positive electrode sheet of the battery after rolling. After the positive electrode sheet is dried and completely removed of moisture therein, it is placed in an environment with a relative humidity of 30% to dry before use.

[0034] Preparation of the negative electrode sheet: the negative electrode sheet is 200 μm conductive carbon paper.

[0035] Assembly: Carry out battery cell assembly in a conventional environment, insert a porous ceramic membrane between the negative electrode sheet and the positive electrode sheet to separate the positive and negative electrodes, stac...

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Abstract

The invention provides a preparation method of a lithium primary battery. The method comprises the following steps of preparation of a positive plate, uniformly mixing a positive active material, conductive agent and binder in proportion, adding into organic solvent, stirring to form uniform positive slurry, coating the positive slurry on a positive current collector, grinding, and cutting into apositive plate; preparing a negative plate, wherein the negative plate is a conductive foil; and assembling, clamping a diaphragm between the positive plate and the negative plate to form a battery cell, putting the battery cell into a battery shell, injecting electrolyte, and packaging to obtain the lithium primary battery. The preparation method of the lithium primary battery is simple in process and low in requirement on an assembly environment, and the battery can be assembled and produced in a non-dry environment, so the requirement on the environment in an assembly process is greatly reduced, safety of the assembly process is improved, and meanwhile, manufacturing cost and operation cost of a drying room are further saved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a lithium primary battery. Background technique [0002] Lithium primary batteries use metallic lithium as the negative electrode, solid salts or salts dissolved in organic solvents as the electrolyte, and metal oxides or other solid or liquid oxidants as the positive active material. Common lithium primary batteries include lithium-manganese dioxide, lithium-copper sulfide, lithium-carbon fluoride, lithium-sulfur dioxide and lithium-thionyl chloride. The most commonly used at present is the lithium-manganese dioxide battery, its positive electrode is manganese dioxide, its negative electrode is metal lithium, and the electrolyte is a non-aqueous organic electrolyte. It has a wide range of applications, and is mainly used as a power supply for automatic cameras, electronic calculators, radios, flashlights, electric toys, watches, etc. in commerc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/16H01M4/06H01M4/58
CPCH01M4/06H01M4/5825H01M6/16H01M4/505H01M4/525H01M4/623H01M6/164H01M6/22H01M4/0404H01M4/08H01M2004/027H01M2004/028H01M2300/0042
Inventor 徐雄文涂健
Owner HUNAN LIFANG NEW ENERGY SCI & TECH