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Lithium-ion battery pole piece with inorganic separation layer, battery including the pole piece, and method for preparing the pole piece

A technology of lithium-ion batteries and battery pole pieces, which is applied in the field of lithium-ion batteries, can solve the problems of poor flexibility of inorganic diaphragms, achieve the effects of reducing electrochemical polarization, simple process, and low investment

Active Publication Date: 2017-01-25
ZHUHAI XUNDA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of the above-mentioned poor flexibility of the inorganic separator, the invention provides a lithium-ion battery pole piece with an inorganic isolation layer and a preparation method thereof. The battery pole piece combines the flexibility of the pole piece itself and the thermal stability of the inorganic material. The combination of properties and the adsorption capacity of the electrolyte better meet the needs of lithium-ion battery applications

Method used

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  • Lithium-ion battery pole piece with inorganic separation layer, battery including the pole piece, and method for preparing the pole piece

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preparation example Construction

[0032] The preparation method of the lithium ion battery pole piece with inorganic barrier layer of the present invention, comprises the steps:

[0033] A. Provide disc-shaped lithium-ion battery pole pieces that are cut into continuous monomers; preferably, laser cutting is used to ensure that the edges of the pole pieces are free of burrs, and eliminate self-discharge and safety hazards.

[0034] B. Mix the inorganic powder, stabilizer, and binder, and add a dispersant to make a uniform mixed dispersion system, and then apply the mixed dispersion system to the battery pole piece to form a film layer; preferably, the inorganic powder is α - One or more of aluminum oxide, silicon dioxide, magnesium oxide, and zirconia; the binder is an acrylate adhesive; the stabilizer is polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene, methylcellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose (CMC), hydroxyethylcellulose, silica gel, polyacrylam...

Embodiment 1

[0042] A. The positive electrode sheet with active material on both sides (5.8mAh / cm 2 ) Roller, laser slitting into a disc shape of continuous monomer;

[0043] B. Mix 35wt% of α-aluminum oxide (average particle size of α-aluminum oxide is 400~600nm), 61wt% of pure water, 3wt% of CMC, and 1wt% of ethyl methacrylate Form a uniform mixed dispersion system; then apply the mixture dispersion system on the cut positive electrode sheet to form a film layer with a thickness of about 60 μm;

[0044] C. Dry the pole piece with the film layer through a high-temperature tunnel furnace. The treatment temperature is 120°C and the treatment time is 6 minutes. pole piece.

[0045] The porosity of the electrode sheet was determined to be 60% by a gravimetric method, and the pore diameter measured by a pore size tester was 60 nm.

[0046] Glue the edge of the positive electrode sheet of the lithium-ion battery with the inorganic separation layer prepared above, cut small pieces, and be equ...

Embodiment 2

[0048] A. The negative electrode sheet (6.3mAh / cm2) with active material on both sides 2 ) Roller, laser slitting into a disc shape of continuous monomer;

[0049] B. Mix 35 wt% of α-aluminum oxide (the average particle size of α-aluminum oxide is 600~800nm), 61 wt% of pure water, 3 wt% of CMC, and 1 wt% of ethyl methacrylate Make a uniform mixed dispersion system; then apply the mixed dispersion system on the cut negative electrode sheet to form a film layer with a thickness of about 60 μm;

[0050] C. Dry the pole piece with the film layer through a high-temperature tunnel furnace. The treatment temperature is 120°C and the treatment time is 6 minutes. pole piece.

[0051] The porosity of the electrode sheet was determined to be 75% by a gravimetric method, and the pore diameter measured by a pore size tester was 100 nm.

[0052] Glue the edge of the negative electrode sheet of the lithium-ion battery with an inorganic separator prepared above, cut into small pieces, matc...

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Abstract

The invention discloses a lithium ion battery pole piece provided with inorganic isolating layers, a preparation method and a battery comprising the pole piece. The battery pole piece is coated with one or more multi-hole inorganic isolating layers; the multi-hole inorganic isolating layers comprise inorganic powder, an agglomerant, and a stabilizer. According to the invention, the electrode pole piece is directly coated with the multi-hole inorganic isolating layers, and can assemble a lithium ion battery without diaphragms; the agglomerant and the stabilizer in the inorganic isolating layers can effectively prevent ceramic particles from dropping off the pole piece, ensure safety performance, are combined with heat stability and adsorbability to electrolyte solution of the inorganic material, and can better meet application requirements of the lithium ion battery; the preparation method is simple in technology, high in material availability, easy in condition realization, low in investment, and favorable for cost reduction and large-scale industrialization; the lithium ion battery pole piece can be used for a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery pole piece with an inorganic separation layer, a preparation method thereof and a battery containing the battery pole piece. The inorganic separation layer can replace a traditional diaphragm. Background technique [0002] With the continuous consumption of primary traditional energy, human beings are more and more worried about the depletion of traditional energy (coal, oil, etc.), so more and more attention is paid to the research on secondary energy and energy storage and conversion equipment. Due to its unique advantages such as environmental protection, high energy density, long cycle life, and low self-discharge, lithium-ion batteries have gradually attracted attention in energy storage and conversion research. Long-term energy storage and continuous recycling require lithium-ion batteries to have long-term stability, high temperature per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/04H01M4/139H01M10/0525
CPCH01M4/04H01M4/13H01M4/139H01M10/0525H01M50/431Y02E60/10
Inventor 仲伟辉
Owner ZHUHAI XUNDA TECH CO LTD
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