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Electrode and preparation method thereof

A technology of electrodes and conductive substances, which is applied in the field of electrodes and their preparation, can solve the problems of complex preparation methods for thick electrodes, uncontrollable pore structure and distribution of thick electrodes, and inconvenient expanded production, so as to facilitate expanded production and methods Simple and easy to implement, the effect of solving processing problems

Pending Publication Date: 2021-07-09
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is to provide an electrode, which solves the problem of uncontrollable pore structure and distribution of existing thick electrodes
[0007] The second technical problem to be solved by the present invention is to provide a preparation method of an electrode, which solves the problems that the preparation method of the existing thick electrode improvement technology is complicated and inconvenient for enlarged production

Method used

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  • Electrode and preparation method thereof
  • Electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Production of the positive electrode sheet:

[0060] 1. Mix the positive electrode active material nickel cobalt lithium manganate (NCM), carbon nanotube conductive agent (CNTs), and binder polyvinylidene fluoride (PVDF) in a weight ratio of 96.5:0.5:3, and then add N-formazan Base pyrrolidone (NMP), make NMP account for 45% of the weight of the whole mixture, stir for 3-5h to obtain positive electrode slurry.

[0061] 2. Coating the slurry containing the active material and the conductive material on the aluminum current collector 1 , drying at 110° C. for tens of seconds to obtain the first active layer 2 with a thickness of 50 μm.

[0062] 3. Spinning a polyacrylonitrile fiber web on the active layer 2 using an electrospinning device. The ratio of polyacrylonitrile:N,N-dimethylformamide (DMF) in the spinning solution is 600mg:10ml, the spinning voltage is 15kV, the distance between the needle tip and the substrate is 15cm, the thickness of the fiber mat is controlle...

Embodiment 2

[0072] The manufacturing process of the positive and negative electrodes and the battery is basically the same as in Example 1, except that the thickness of the polyacrylonitrile fiber web in Example 1, that is, the thickness of the through-hole layer is changed to 10 μm.

Embodiment 3

[0074] The manufacturing process of the positive and negative electrodes and the battery is basically the same as in Example 1, except that the thickness of the first active layer 2 in Example 1 is changed to 245 μm, and the thickness of the second active layer 2 is changed to 50 μm.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to an electrode and a preparation method thereof. The electrode comprises a current collector, a plurality of through hole layers and a plurality of active layers, the through hole layers and the active layers are arranged on the current collector, and the through hole layers are arranged between the current collector and the active layers or between any adjacent active layers. The electrode is composed of a plurality of active layers and through hole layers, each through hole layer is composed of a net structure of a high polymer, the high polymer is dissolved in electrolyte when the electrode is used, namely a pore structure with controllable pore size and distribution is formed, so that each active layer can be in contact with more electrolyte, and the problems that electrolyte infiltration of a thick electrode is difficult and ion transmission is slow are solved. Besides, the morphology of the through hole layer is controllable, compared with a traditional porous electrode, the tortuosity of pores is lower, ion conduction is faster, the ion conductivity of the pole piece is improved, and then the energy, the power density and the rate capability of a battery cell are guaranteed.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrode and a preparation method thereof. Background technique [0002] At present, with the continuous development of science and technology, the application field of lithium-ion batteries has expanded from portable electronic products to electric vehicles, energy storage power supplies, aviation fields, etc. Especially for large electric equipment such as electric vehicles, under the premise of ensuring safety, they need to have a certain mileage and a cycle life matching that of electric vehicles. Therefore, higher requirements are put forward for the energy density, cycle life and rate performance of lithium-ion batteries. Require. [0003] In order to make a single device have a higher energy density, the proportion of energy storage materials in the device can be increased as much as possible while ensuring safe operation, that is, thicker electrodes are...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/136H01M4/36H01M4/66H01M4/74H01M4/1391H01M4/1397H01M10/0525H01M10/058
CPCH01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/366H01M4/667H01M4/74H01M10/058H01M10/0525H01M2004/028Y02P70/50Y02E60/10
Inventor 陈锴钱丽陈啸天孙小嫚杨道均吴宁宁吴可
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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