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Lithium ion battery anode pulp and preparation method thereof

A lithium-ion battery and negative electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of sticky roll dropping, low battery energy density, poor process yield, etc., so that it is not easy to drop powder, increase Energy density, the effect of increasing the ratio of active substances

Inactive Publication Date: 2017-05-17
TIANJIN SINOPOLY NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a lithium-ion battery in order to overcome the existing defects of the existing lithium-ion battery negative electrode slurry, which are prone to sticking and dropping, poor process yield and low energy density of the prepared battery. Negative electrode slurry and preparation method thereof

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  • Lithium ion battery anode pulp and preparation method thereof
  • Lithium ion battery anode pulp and preparation method thereof

Examples

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Embodiment 1

[0032] This embodiment provides a preparation method of lithium ion battery negative electrode slurry, comprising the following steps:

[0033] (1) add the deionized water of the CMC of 0.5 weight part and 50 weight parts in agitator, stir 3h with the rotating speed of 800rpm, obtain CMC glue after stirring;

[0034] (2) Add 1 weight part of conductive carbon black to the CMC glue, and stir for 90min at a speed of 1500rpm;

[0035] (3) Add two equal parts of 96 parts by weight of artificial graphite into the agitator successively, and the stirring rate is 500rpm when mixing starts. ;

[0036] (4) Add 2.5 parts of LA133 into the stirrer and stir at 800rpm for 30min;

[0037] (5) add deionized water to adjust the viscosity to 1500mpas;

[0038] (6) After evacuating to -0.085MPa for defoaming, the slurry is obtained by filtering through a filter screen, and the viscosity of the slurry is 1250mpas.

Embodiment 2

[0040] This embodiment provides a preparation method of lithium ion battery negative electrode slurry, comprising the following steps:

[0041] (1) add the CMC of 0.8 weight part and the deionized water of 50 weight parts in agitator, stir 3h with the rotating speed of 800rpm, obtain CMC glue after stirring;

[0042] (2) Add 1 weight part of conductive carbon black to the CMC glue, and stir for 90min at a speed of 1500rpm;

[0043] (3) Add two parts of 95.2 parts by weight of artificial graphite into the agitator in turn, and the stirring rate is 500rpm when mixing starts. ;

[0044] (4) Add 2.8 parts of LA133 into the stirrer, stir at 800rpm for 30min;

[0045] (5) add deionized water to adjust the viscosity to 1500mpas;

[0046] (6) After evacuating to -0.090MPa for defoaming, the slurry is obtained by filtering through a filter screen, and the viscosity of the slurry is 1250mpas.

Embodiment 3

[0048] This embodiment provides a preparation method of lithium ion battery negative electrode slurry, comprising the following steps:

[0049] (1) add the CMC of 0.7 weight part and the deionized water of 50 weight parts in agitator, stir 3h with the rotating speed of 800rpm, obtain CMC glue after stirring;

[0050] (2) Add 1 weight part of conductive carbon black to the CMC glue, and stir for 90min at a speed of 1500rpm;

[0051] (3) Add two equal parts of 96 parts by weight of artificial graphite into the agitator successively, and the stirring rate is 500rpm when mixing starts. ;

[0052] (4) Add 2.3 parts of LA133 into the stirrer, stir at 800rpm for 30min;

[0053] (5) add deionized water to adjust the viscosity to 1380mpas;

[0054] (6) After evacuating to -0.085MPa for defoaming, the slurry is obtained by filtering through a filter screen, and the viscosity of the slurry is 1180mpas.

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Abstract

The invention discloses a method for preparing lithium ion battery anode pulp. The method comprises the following steps: (1) mixing CMC with deionized water, and uniformly dispersing to prepare CMC glue solution; (2) adding conductive carbon black into the CMC glue solution obtained in the step (1), and uniformly dispersing; (3) adding a carbon material, and uniformly dispersing; (4) adding LA133, and uniformly dispersing; (5) adjusting the viscosity with deionized water; and (6) vacuumizing to remove foam, and filtering to obtain the lithium ion battery anode pulp. The water-borne adhesive combined with CMC and LA133 is adopted, the suspending stability of lithium ion battery pulp is promoted by synergistic effect of CMC and LA133 by controlling the specific content of CMC and LA133 and the specific preparation method, the caking performance of anode pieces can be ensured, the dusting phenomenon can be prevented, the proportion of active substances is effectively increased on the basis of ensuring product stability, and the battery energy density is improved.

Description

technical field [0001] The invention relates to the field of slurry preparation of lithium ion batteries, in particular to a negative electrode slurry of lithium ion batteries and a preparation method thereof. Background technique [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have higher energy density, and have the advantages of small self-discharge and long cycle life. They have been widely used in the fields of consumer electronics and power batteries. Lithium-ion battery negative electrode material is one of the key materials for manufacturing lithium-ion batteries, but the production cost of negative electrode materials for oily systems is relatively high. Therefore, in order to reduce the manufacturing cost of lithium-ion batteries, water-based negative electrode materials are generally used at present. Lithium-ion battery aqueous negative electrode slurry is mainly divided into two syste...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/62H01M4/133H01M10/0525
CPCH01M4/133H01M4/1393H01M4/621H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 秦怀鹏王震赵政威马紫峰
Owner TIANJIN SINOPOLY NEW ENERGY TECH
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