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A pole piece and its preparation method

A pole piece and active material technology, applied in the field of pole piece and its preparation, can solve the problems such as electrochemical performance needs to be improved, and achieve the effect of easy industrial production, short process and simple operation

Active Publication Date: 2021-07-27
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the carbon is not evenly distributed in the Li 1.8 mn 0.8 co 0.2 o 2.8 Dispersion among them leads to its electrochemical performance to be improved

Method used

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  • A pole piece and its preparation method
  • A pole piece and its preparation method
  • A pole piece and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The present embodiment provides a kind of preparation method of pole piece, and its specific method is:

[0067] (1) Manganese dioxide (active material) and carbon nanotubes (conductive carbon) are mixed and sanded with a sand mill for 4 hours to obtain a sand mill mixture; the size of the zirconium beads used for sand mill is 0.4mm-0.8mm, and the sand The mixing speed of the mill is 1500rpm, and in the sand-milled mixture, the particle size of the active material after sand-milling is 10 μm-35 μm;

[0068] (1') After adding water to the sand mill mixture described in step (1), stir with a mixer for 1 h to obtain a further mixed material. In the further mixed material, the solid content is 30%;

[0069] (2) adding the manganese dioxide (active substance) whose particle size is 40 μm-80 μm to the further mixed material described in step (1′), and stirring with a mixer for 3h to obtain the supplemented mixture; step (2) The ratio of the quality of the active substance ad...

Embodiment 2

[0077] The present embodiment provides a kind of preparation method of pole piece, and its specific method is:

[0078] (1) After mixing the active material manganese dioxide and the conductive agent graphene, use a sand mill for sand grinding for 2 hours to obtain the sand grinding mixture; the size of the zirconium beads used for sand grinding is 0.3mm-0.6mm, and the mixing speed of the sand mill is 1000rpm, and in the sand-milled mixture, the particle size of the sand-milled active material is 10 μm-20 μm;

[0079] (1') After adding water to the sand mill mixture described in step (1), stir with a mixer for 0.5h to obtain a further mixed material. In the further mixed material, the solid content is 20%;

[0080] (2) Add the active substance manganese dioxide with a particle diameter of about 40 μm in the further mixed material described in step (1'), and stir with a mixer for 1h to obtain the supplemented mixture; the added in the step (2) The mass ratio of the mass of the...

Embodiment 3

[0085] The present embodiment provides a kind of preparation method of pole piece, and its specific method is:

[0086] (1) After mixing the active material iron disulfide and conductive agent graphene, sand mill 6h with a sand mill to obtain the sand mill mixture; the size of the zirconium beads used in the sand mill is 1.6mm-2mm, and the mixing speed of the sand mill is 2000rpm, in the sand-milled mixture, the particle size of the sand-milled active material is 30 μm-50 μm;

[0087] (1') After adding water to the sand mill mixture described in step (1), stir with a mixer for 3 hours to obtain a further mixed material. In the further mixed material, the solid content is 50%;

[0088] (2) Add the active substance iron disulfide with a particle diameter of about 80 μm to the further mixed material described in step (1'), and stir with a mixer for 5h to obtain the supplemented mixture; the added in the step (2) The mass ratio of the mass of the active substance iron disulfide t...

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Abstract

The invention provides a pole piece and a preparation method thereof. The preparation method comprises: 1) sand-milling the active material and the conductive agent to obtain a sand-milling mixture; 2) adding the active material to the sand-milling mixture in step 1), and performing mixing to obtain a supplementary 3) adding a binder to the supplemented mixture in step 2), and performing mechanical molding to obtain the pole piece. The present invention also provides a pole piece prepared by the above method, the pole piece is composed of an active material, a conductive agent and a binder, and the conductive agent is coated on the surface of the active material. The method provided by the invention solves the problem of the agglomeration of the conductive agent in the prepared pole piece and the partial interruption of the conductive network composed of the active material in the pole piece due to the uneven dispersion of the conductive agent, and at the same time, it does not cause the pole piece to be difficult to form. problem, and avoid the introduction of conductive agent dispersants. The pole piece provided by the invention has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of electrodes, and in particular relates to a pole piece and a preparation method thereof. Background technique [0002] For commercial lithium batteries, the electrodes are usually composed of active materials, conductive carbon black (acetylene black, graphite, Ketjen black, etc.) and binders. When the electrode active material is metal oxide, sulfide or fluoride with redox activity, such as manganese dioxide, iron disulfide, copper oxide, ferric fluoride, etc., the conductivity of this type of electrode active material itself is poor, and the raw material The particle distribution itself is uneven. In order to improve the conductivity between the battery active materials and reduce the impedance of the battery itself, it is necessary to select a more suitable conductive agent as the connection medium. Carbon nanotubes and graphene are the conductive agents that have emerged in recent years. Carbon nanotubes The di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/131H01M4/136H01M4/36H01M4/50H01M4/58H01M4/62H01M10/0525B02C17/16
CPCB02C17/16H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/366H01M4/502H01M4/5815H01M4/582H01M4/625H01M10/0525Y02E60/10
Inventor 李会娜赵瑞瑞祝媛刘建华刘金成
Owner EVE ENERGY CO LTD