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Preparation process of lithium ion battery negative paste, lithium ion battery negative pole plate and lithium ion battery

A technology for lithium ion batteries and negative electrode slurry, which is applied in battery electrodes, electrode carriers/current collectors, electrode manufacturing, etc., and can solve problems such as the improvement of the dispersibility and consistency of the unfavorable slurry, the overall performance of the negative electrode, and the utilization of equipment. problems such as low rate, to achieve the effect of improving equipment utilization, shortening batching time, and shortening production time

Active Publication Date: 2018-07-20
BEIJING NAT BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current dry mixing process still takes a long time. The whole batching process takes ten hours or more, and the production efficiency is low, resulting in low equipment utilization. In addition, when mixing pulp, the solid content of the slurry is generally low or low. High, which is not conducive to the improvement of the dispersion and consistency of the slurry, and is not conducive to the improvement of the overall performance of the final negative electrode sheet

Method used

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  • Preparation process of lithium ion battery negative paste, lithium ion battery negative pole plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] A batching process of a lithium ion battery negative electrode slurry, comprising the following steps:

[0106] (a) Calculate and weigh natural graphite, conductive carbon black, polyethylene glycol and CMC according to the mass ratio, and perform dry mixing for 30min at the speed of revolution 20r / min and rotation 0r / min to obtain mixed powder;

[0107] (b) adding deionized water, firstly mixing and stirring for 10 minutes at the speed of revolution 20r / min and rotation 0r / min, then mixing and stirring for 120min at the speed of revolution 35r / min and rotation 0r / min, to obtain a solid content of 68.2wt% For the primary slurry, the amount of deionized water added is based on a solid content of 68.2 wt%;

[0108] (c) Add deionized water, firstly mix and stir for 10min at the speed of revolution 20r / min and rotation 0r / min, and then mix and stir for 90min at the speed of revolution 35r / min and rotation 1000r / min, to obtain a solid content of 60.1wt% The secondary slurry...

Embodiment 2

[0113] A batching process of a lithium ion battery negative electrode slurry, comprising the following steps:

[0114] (a) Calculate and weigh artificial graphite, conductive carbon black, polyethylene glycol and CMC according to the mass ratio, and perform dry mixing for 35min at the speed of revolution 20r / min and rotation 0r / min to obtain mixed powder;

[0115] (b) adding deionized water, firstly mixing and stirring for 12min at the speed of revolution 20r / min and rotation 0r / min, and then mixing and stirring for 115min at the speed of revolution 35r / min and rotation 0r / min to obtain a primary solid content of 68wt% Slurry, the amount of deionized water added is 68wt% solid content;

[0116] (c) Add deionized water, mix and stir for 15 minutes at the speed of revolution 20 r / min and rotation 0 r / min, and then mix and stir for 60 min at the speed of revolution 35 r / min and rotation 1000 r / min to obtain a solid content of 60 wt% Secondary slurry, the amount of deionized wate...

Embodiment 3

[0121] A batching process of a lithium ion battery negative electrode slurry, comprising the following steps:

[0122] (a) Calculate and weigh activated carbon, conductive carbon fiber, polyvinylpyrrolidone and CMC according to the mass ratio, and perform dry mixing for 30min at the speed of revolution 25r / min and rotation 0r / min to obtain mixed powder;

[0123] (b) adding deionized water, firstly mixing and stirring for 10 minutes at the speed of revolution 15r / min and rotation 0r / min, and then mixing and stirring for 120min at the speed of revolution 45r / min and rotation 0r / min to obtain a primary solid content of 69wt% Slurry, the added amount of deionized water is based on the solid content of 69wt%;

[0124] (c) Add deionized water, firstly mix and stir for 10min at the speed of revolution 15r / min and autorotation 0r / min, then mix and stir for 90min at the speed of revolution 30r / min and autorotation 1500r / min to obtain a solid content of 61wt% Secondary slurry, the amou...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and relates to a preparation process of lithium ion battery negative paste, a lithium ion battery negative pole plate and a lithium ion battery. The preparation process of the lithium ion battery negative paste comprises the following steps of (a) mixing a negative active substance, a conductive additive, a dispersion agent anda thickening agent in a dried way to obtain mixed powder; (b) adding a solvent, performing uniform mixing to obtain primary paste with solid content being 67-69wt%; (c) adding the solvent again, performing uniform mixing to obtain secondary paste with solid content being 58-62wt%; (d) adding the solvent again, performing uniform mixing to obtain third paste with solid content being 54-56wt%; and(e) adding a binding agent into the third paste, and performing uniform mixing to obtain the lithium ion battery negative paste. The process is simple and is easy to operate, the preparation time canbe remarkably prepared, the equipment utilization ratio is improved, meanwhile, the mixing is uniform, and the dispersion performance, the consistency and the fineness of the paste are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a batching process of negative electrode slurry of lithium ion batteries, negative electrode sheets of lithium ion batteries and lithium ion batteries. 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 applications s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/62H01M10/0525H01M4/66
CPCH01M4/0402H01M4/366H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 魏彦聪赵冬梅郭伟吴丛笑张景舒栗瑞芹
Owner BEIJING NAT BATTERY TECH
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