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Preparation method of lithium ion battery cathode paste, lithium ion battery cathode plate and lithium ion battery

A technology for lithium ion battery and cathode slurry, applied in the field of lithium ion battery, can solve the problems of poor dispersion and consistency, poor stability of slurry, low equipment utilization rate, etc. The effect of short production times

Inactive Publication Date: 2018-07-13
河南国能电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current positive electrode slurry preparation process, the steps of gelation, homogenization, and defoaming are all carried out in the same stirring tank, which takes a long time for preparation, low production efficiency, and low utilization of equipment; in addition, agglomeration is easy to occur during preparation. The resulting slurry has poor stability, poor dispersion and consistency, which affects the final battery performance

Method used

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  • Preparation method of lithium ion battery cathode paste, lithium ion battery cathode plate and lithium ion battery
  • Preparation method of lithium ion battery cathode paste, lithium ion battery cathode plate and lithium ion battery
  • Preparation method of lithium ion battery cathode paste, lithium ion battery cathode plate and lithium ion battery

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preparation example Construction

[0041] In a first aspect, in at least one embodiment, a method for preparing a positive electrode slurry for a lithium-ion battery is provided, the method comprising the following steps:

[0042] Add the solvent and the binder into the glue tank and mix evenly to prepare glue, and send the glue into storage tank A for storage;

[0043] Add the glue, conductive agent and active material into the stirring tank, mix evenly to prepare the slurry to be treated, and send the slurry to be treated into the storage tank B for storage;

[0044] The slurry to be treated is sent to a high-speed dispersion system for treatment to obtain a positive electrode slurry for a lithium battery.

[0045] The invention solves the problems that the existing lithium-ion battery slurry has a long batching time and the mixing uniformity needs to be improved, so as to achieve the preparation of a slurry with uniform dispersion and long-term stable performance in a relatively short period of time.

[004...

Embodiment 1

[0090] figure 1 The process flow diagram for the preparation of the positive electrode slurry for lithium-ion batteries provided by an embodiment of the present invention is shown, as figure 1 As shown, it mainly includes the following steps:

[0091] (a) Glue making: first add NMP to the glue making tank and stir to raise the temperature to 40°C, the stirring and heating time is 30 minutes, then add PVDF and stir for 90 minutes to make the glue, put the prepared glue into storage In tank A, it is used for homogenization; the mass ratio of NMP to PVDF is 12:1;

[0092] (b) Homogenization: Add the prepared glue and conductive agent into the stirring tank at the same time, stir for 10 minutes under the condition that the revolution and rotation speeds of the stirring tank are 15 rpm and 1000 rpm respectively, and then at a low speed Stirring means that the active substance is added to the stirring tank under the conditions of the revolution and rotation speeds of 10 rpm and 50...

Embodiment 2

[0095] A preparation method of lithium ion battery positive electrode slurry mainly comprises the following steps:

[0096] (a) Glue making: First add NMP into the glue making tank and stir to raise the temperature to 35°C, the stirring and heating time is 25 minutes, then add PVDF and stir for 80 minutes to make the glue, put the prepared glue into storage In tank A, it is used for homogenization; the mass ratio of NMP to PVDF is 13:1;

[0097] (b) Homogenization: the prepared glue and conductive carbon black are added to the stirring tank simultaneously, and the revolution and rotation speed of the stirring tank are respectively 10 rev / min and 800 rev / min and stirred for 12min, then Low-speed stirring is to add lithium iron phosphate into the stirring tank under the conditions of revolution and rotation speeds of 10 rpm and 400 rpm respectively. The feeding time is 12 minutes. After the addition is completed, the rotation and revolution speeds are increased. Stir for anothe...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of lithium ion battery cathode paste, a lithium ion battery cathode plate and a lithium ion battery. The preparation method of the lithium ion battery cathode paste comprises the following steps: adding a solvent and a bonding agent into a glue preparation tank, and evenly mixing to obtain aglue solution; sending the glue solution into a storage tank A for storing; adding the glue solution, a conductive agent and active materials into a mixing tank, and evenly mixing to obtain paste to be treated; sending the paste to be treated to a storage tank B for storing; sending the paste to be treated to a high speed dispersion system for treating so as to obtain the lithium ion battery cathode paste. The preparation method provided by the invention is simple in process and easy to operate, can remarkably reduce the blending time, and increases the production efficiency and the equipmentutilization rate; furthermore, the paste is evenly mixed and is good in dispersity and consistency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode slurry of a lithium ion battery, a positive electrode sheet of a lithium ion battery and a lithium ion battery. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the development trend of secondary batteries; they have been widely used in wireless communications, digital cameras, notebook computers and other portable appliances. Power supply, and has broad application prospects as a power supply for special applicati...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/04H01M4/13H01M10/0525
CPCH01M4/04H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 林保山谢剑波闫李钰
Owner 河南国能电池有限公司
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