Preparation method of battery pole piece and battery

A battery pole piece and electrode technology, which is applied in the direction of electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problems of low utilization rate of active materials, short circuit of batteries, inability to mix materials and binders uniformly, etc.

Inactive Publication Date: 2020-05-12
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are the following disadvantages in the method of drawing pulp: (1) In order to avoid the pulp agglomeration caused by the fibrosis of the binder PTFE, the temperature of the slurry, the mixing time and the stirring speed must be controlled in the pulping process, which will cause the material and bonding (2) The viscosity of the positive electrode slurry is usually ≥60000mPa s, and the slurry with high viscosity is likely to make the thickness consistency and uniformity of the slurry diaphragm poor, and even have a certain degree of delamination ;At the same time, with the progress of the slurry drawing process, the viscosity of the slurry continues to increase, and it is easy to make the thickness consistency of the front and rear sections of the current collector poor, and even the thickness difference can exceed 0.20mm; the process controllability is poor
(3) After the slurry is formed into a membrane, the surface density of the pole piece is low, and the battery made by this method has a low capacity; (4) The degree of compaction of the pole piece is too large, and the pores inside the particles are forcibly squeezed and deformed. The porosity is too low and the pore distribution is uneven, and the discharge consistency is poor
(5) The depth of discharge in different regions of the pole piece is different, and the expan...

Method used

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  • Preparation method of battery pole piece and battery
  • Preparation method of battery pole piece and battery

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preparation example Construction

[0026] In order to better describe the method for preparing the above-mentioned battery pole piece, so as to better understand the concept of the above-mentioned method for preparing the battery pole piece. see figure 1 , in one embodiment, a method for preparing a battery pole piece, comprising the following steps:

[0027] S110, mixing and granulating the active material, conductive agent, binder and pure water to obtain electrode particles.

[0028] It can be understood that the performance of the electrode material has an important impact on the performance of the lithium-ion battery. The more uniform the components in the electrode material are dispersed, the better the processing performance of the electrode sheet, and the more uniform the impedance distribution of the electrode sheet. The greater the role of the active material during charging and discharging, the better the performance of the battery. In order to improve the performance of the electrode material, the...

Embodiment 1

[0043] Add 90kg of manganese dioxide, 2kg of conductive carbon, 4kg of polytetrafluoroethylene and 8kg of pure water into the granulator at an online speed of 4m / s, and perform a 2min mixing and granulation operation to obtain electrode particles with a particle size of 0.3mm ;

[0044] The electrode particles and the positive electrode aluminum foil current collecting net with a plurality of diamond-shaped holes with a rhombus length of 1 mm are subjected to roll lamination operation, and the distance between the two rolls is controlled to be 0.4 mm, and the linear pressure is 700 N / cm to prepare Electrode pressing sheet;

[0045] Under the temperature condition of 200° C., the electrode laminated sheet was baked, followed by sizing operations 4 times, and finally cut and stripped to obtain the battery electrode sheet of Example 1.

Embodiment 2

[0047] Add 91kg of manganese dioxide, 3kg of carbon nanotubes, 4kg of polytetrafluoroethylene and 10kg of pure water into the granulator at an online speed of 5m / s, and perform a 3min mixing and granulation operation to obtain an electrode with a particle size of 0.5mm particles;

[0048] The electrode particles and the positive electrode aluminum foil collector net with a plurality of diamond-shaped holes with a rhombus length of 1 mm are subjected to roll lamination operation, the distance between the two rolls is controlled to be 0.5 mm, and the linear pressure is 750 N / cm to prepare Electrode pressing sheet;

[0049] Under the temperature condition of 210° C., the electrode press-bonded sheet was baked, followed by sizing operations four times, and finally cut and stripped to obtain the battery electrode sheet of Example 2.

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Abstract

The preparation method of the battery pole piece comprises the following steps: carrying out mixing granulation operation on an active substance, a conductive agent, a binder and pure water to obtainelectrode particles; performing roll-in film laminating operation on the electrode particles and an electrode current collecting net to prepare an electrode laminated sheet; and carrying out baking operation on the electrode lamination sheet to obtain the battery pole piece. Thus, various components are mixed and granulated to obtain the electrode particles instead of conventional slurry, so thatthe non-uniformity caused by subsequent combination with the current collector can be avoided, and the porosity can be improved; and the electrode current collecting net and the electrode particles are adopted to carry out roll-in film laminating operation, so that the electrode particles can be clamped and embedded into the electrode current collecting net, the combination firmness is improved, the powder falling problem is avoided, the use of a binding agent can be reduced, and the discharge performance of the battery pole piece is also greatly improved. In addition, the invention also provides a battery comprising the battery pole piece.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing battery pole pieces and a battery. Background technique [0002] Usually, when preparing the electrode sheet, the slurry drawing method is adopted, that is, the electrode slurry is coated on the current collector, and then the electrode sheet is obtained through baking, coining and cutting. [0003] However, there are the following disadvantages in the method of drawing pulp: (1) In order to avoid the pulp agglomeration caused by the fibrosis of the binder PTFE, the temperature of the slurry, the mixing time and the stirring speed must be controlled in the pulping process, which will cause the material and bonding (2) The viscosity of the positive electrode slurry is usually ≥60000mPa s, and the slurry with high viscosity is likely to make the thickness consistency and uniformity of the slurry diaphragm poor, and even have a certain degree of delamination...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCH01M4/043H01M4/0471Y02E60/10
Inventor 赵瑞瑞朱亮祝媛袁中直刘金成
Owner EVE ENERGY CO LTD
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