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Lithium ion battery electrode sheet and preparation method thereof

A technology for lithium ion batteries and electrode sheets, which is applied in battery electrodes, electrode manufacturing, electrode rolling/calendering, etc., to achieve the effect of simple and convenient process route, good electrical conductivity, and cost reduction

Inactive Publication Date: 2018-06-15
北京乐华锂能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the usual rolling process, on the one hand, requires the use of professional rolling equipment; on the other hand, it needs to use appropriate rolling conditions to prepare electrodes that meet the requirements.

Method used

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  • Lithium ion battery electrode sheet and preparation method thereof

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preparation example Construction

[0033] A preparation method of lithium-ion battery electrode pole piece:

[0034] 1. Under the condition of no solvent, a certain proportion of positive or negative active materials, polymer binders, solid electrolytes and other additives are mixed to obtain uniform powder materials. Among them, the positive or negative active materials The number of parts by weight is 80-95 parts, and the positive electrode active material can be selected from one or a combination of two or more of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium vanadium phosphate, ternary materials or manganese-rich materials. The negative electrode active material can be selected from one, two or more combinations of two-dimensional materials such as graphite-based materials, silicon-based materials, tin-based materials, lithium titanate or graphene; the number of parts by weight of the polymer binder is 3 -10 parts, the polymer binder can be selected from one, two or more combinations...

Embodiment 1

[0038] 1. In a high-energy ball mill, mix 94% lithium cobalt oxide cathode material, 3% PVDF binder, 2% PVDF lithium salt electrolyte and 1% conductive carbon black for 30 minutes to obtain the required Uniform powder material; then use a low-pressure thermal spraying process to coat a layer of uniform powder layer with a thickness of 100 μm on the surface of the aluminum foil; then use a normal temperature laser sintering process to finally obtain a lithium cobalt oxide battery electrode pole piece. Record the thickness, porosity and 0.3C capacity of the lithium cobalt oxide battery electrode sheet obtained by this method, see No. 1-4 in Table 1.

[0039] 2. In the mixer, use the same ratio to use 94% lithium cobalt oxide cathode material, 3% PVDF binder, 2% PVDF lithium salt electrolyte and 1% conductive carbon black The organic solvent NMP is uniformly dispersed; then the lithium cobalt oxide battery electrode sheet is obtained through coating and rolling processes. Record...

Embodiment 2

[0043] 1. In the ultrasonic mixing equipment, the mass fraction of 90% lithium manganate cathode material, 5% Li 3OCl solid electrolyte and 5% graphene are mixed with high energy for 2 hours to obtain the required uniform powder material; then a layer of uniform powder layer with a thickness of 200 μm is coated on the surface of aluminum foil by high-pressure cold powder spraying process; then microwave curing process is used Finally, the lithium manganese oxide battery electrode pole piece is obtained. Record the thickness, porosity and 0.3C capacity of the lithium manganate battery electrode sheet obtained by this method, see No. 1-4 in Table 2.

[0044] 2. In the ultrasonic mixing equipment, under the same ratio, the lithium manganate cathode material with a mass fraction of 90%, and 5% Li 3 OCl solid state electrolyte and 5% graphene are uniformly dispersed with organic solvent NMP; then the lithium manganate battery electrode sheet is obtained through coating and rolling...

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Abstract

The invention discloses a lithium ion battery electrode sheet and a preparation method thereof. The method comprises the following steps: 1) material mixing: under existence condition of solvent-free,uniformly mixing an anode active material or a cathode active material, a high-molecular binder, a solid electrolyte and an auxiliary agent to obtain uniform powder, 2) continuous powder injection: continuously coating the surface of a foil with the uniform powder, and forming a layer of electrode powder on the surface of the foil, and 3) solidification: melting the materials in the step 1) through a solidification technology, forming a continuous electrode film layer, and obtaining the required lithium ion battery electrode. The method avoids consumption of a lot of energy to remove an organic solvent during an electrode sheet preparation process in a traditional slurry coating mode, pollution due to the organic solvent is reduced, a technology route is simple, energy consumption is low,and the method is suitable for industrial production, the obtained lithium ion battery electrode sheet has the advantages of good compactness and good conductive performance, and the performance of abattery is excellent.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode preparation technology, and in particular relates to a lithium-ion battery electrode pole piece prepared by solvent-free low-temperature curing and a preparation method thereof. Background technique [0002] At present, with the development of the current demand for batteries, lithium-ion batteries are the best-developed new power supply in the past ten years. Due to its high voltage, high energy density, and superior cycle performance, it rapidly promotes the development of electric vehicles, and at the same time promotes a large demand for lithium-ion batteries in all parts of the society. [0003] Lithium-ion batteries, as a sunrise industry of new energy, have alleviated to a certain extent the rate of environmental degradation caused by air pollution, water pollution and solid waste pollution. However, traditional lithium-ion battery production uses a large amount of organic solv...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/04H01M10/0525
CPCH01M4/04H01M4/0419H01M4/0435H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M10/0525Y02E60/10
Inventor 周敏苑克国赵越付光辉
Owner 北京乐华锂能科技有限公司
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