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Preparation method of lithium ion battery

A lithium ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc. Ion conduction characteristics, electron conductivity improvement, effect of reducing migration path

Active Publication Date: 2018-11-16
东方醒狮新动力电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that the graphite material has poor structural stability, poor compatibility with the electrolyte, and the slow diffusion rate of Li ions in its ordered layered structure, which makes the material unable to charge and discharge at a high rate.
However, soft carbon has low crystallinity, small grain size, large interplanar spacing, and good compatibility with the electrolyte, but the irreversible capacity for the first charge and discharge is good, and the application range is small. The above artificial graphite is used as the negative electrode material of lithium-ion batteries. Some structural defects, in order to obtain anode materials with high electrochemical performance, it is necessary to carry out further surface modification and modification

Method used

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  • Preparation method of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing a lithium ion battery, comprising the steps of:

[0038] (1) Positive electrode preparation: prepare the positive electrode active material, and put the positive electrode active material, acetylene black, polyvinylidene fluoride binder and absolute ethanol into the reaction according to the ratio of 80:1:2:60 by weight Stirring at a constant speed in the kettle to obtain the positive electrode slurry, and coating the positive electrode slurry on the aluminum foil current collector, and cutting to obtain the positive electrode sheet;

[0039] (2) Negative plate preparation: prepare the negative plate active material, and put the negative plate active material, acrylic acid aqueous solution with a solid content of 30%, acetylene black, and absolute ethanol into the reactor according to the ratio of 82:1:1:55 by weight Stir at a medium and constant speed to obtain the negative electrode slurry, and coat the negative electrode slurry on the aluminum ...

Embodiment 2

[0062] The content of this example is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that in this example, when preparing the active material of the positive electrode sheet, step (4.3) is not included, and the modified intermediate Carry out the step (4.4) to obtain the active material of the positive electrode sheet, and prepare to form the lithium ion battery.

Embodiment 3

[0064]The content of this embodiment is basically the same as that of Implementation 1, and the similarities will not be repeated. The difference is that in this embodiment, when preparing the active material of the positive electrode sheet and the active material of the negative electrode sheet, step (4.1) and step (5.1) ), only graphene and carbon nanotubes are mixed and pulverized to obtain a mixed solution, and the lithium-ion battery is prepared.

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Abstract

The invention relates to the technical field of lithium ion battery electrode materials, in particular to a preparation method of a lithium ion battery; the preparation method comprises the followingsteps of preparing a positive pole piece: preparing a positive pole piece active substance; adding the positive pole piece active substance, and acetylene black, a polyvinylidene fluoride adhesive andabsolute ethyl alcohol according to the weight percentage ratio of 80: 1: 2: 60 to a reaction kettle, and stirring at a constant speed to obtain positive electrode slurry, and coating an aluminum foil current collector with the positive electrode slurry, and performing cutting to obtain the positive pole piece. Therefore, when the positive pole piece active substance is prepared, carbon nano tubes and graphene are taken as a modified additive to form a structure with a lithium iron phosphate positive electrode material in the inner side and amorphous carbon on the outer side in a coating manner, so that quite high ionic conductivity is achieved; and meanwhile, lithium-rich compounds can be used for modifying the surface structure of lithium phosphate, so that the electron conductivity ofthe lithium phosphate surface is improved.

Description

Technical field: [0001] The invention relates to the technical field of lithium-ion battery electrode materials, in particular to a preparation method of a lithium-ion battery. Background technique: [0002] A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. It is different from a rechargeable battery. Lithium-ion batteries are different from lithium-ion polymer batteries. The inventor of the lithium battery is Edison. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology at the end of the 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements for power supply. Lithium batteries have entered a large-scale pra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M4/139
CPCH01M4/139H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 丘焕山
Owner 东方醒狮新动力电池有限公司