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Diaphragm containing active interlayer, preparation method and application thereof

An active and interlayer technology, applied in the field of electrochemical energy storage, can solve the problems of limited inhibition of lithium dendrites, achieve the effects of inhibiting lithium dendrites, increasing discharge specific capacity, and improving cycle performance

Inactive Publication Date: 2017-11-03
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods ultimately enhance the resistance of the separator to lithium dendrites by enhancing the mechanical strength of the separator itself, and the inhibitory effect on lithium dendrites is limited.

Method used

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  • Diaphragm containing active interlayer, preparation method and application thereof
  • Diaphragm containing active interlayer, preparation method and application thereof
  • Diaphragm containing active interlayer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 0.1g of La132 into 30g of deionized water and stir with a magnetic stirrer until La132 is completely dissolved; weigh 1g of elemental sulfur into the La132 solution and stir for 2 hours to obtain a mixed active slurry. Squeegee-coat the active slurry on the polyethylene separator (as the base film), put it in a 60°C oven to dry, and form an active coating on the base film.

[0025] Weigh 0.1g CMC (sodium carboxymethylcellulose) into 30g deionized water, stir with a magnetic stirrer until CMC is completely dissolved; weigh 0.5g Al 2 o 3 Add PVDF (polyvinylidene fluoride) solution, stir for 3 hours, drop 2 drops of SBR (styrene-butadiene rubber) emulsion to obtain insulating slurry; spray the insulating slurry on the active coating, and put it in a 60°C oven to dry to form insulation layer, resulting in a membrane containing an active interlayer.

[0026] The lithium metal is used as the negative electrode, and the sulfur-carbon composite material is used as the p...

Embodiment 2

[0032] Weigh 0.01g of PVDF and add it to 30g of NMP (N-methylpyrrolidone), stir with a magnetic stirrer until the PVDF is completely dissolved; weigh 0.5g of carbon fluoride material into the PVDF solution, and stir for 6 hours to obtain a mixed active slurry. The active slurry is transferred and coated on the glass fiber membrane (base film), and dried in an oven at 100°C to obtain an active coating.

[0033] Weigh 0.05g PVDF, add 30g to NMP, stir with a magnetic stirrer until the PVDF is completely dissolved; weigh 0.1g silicate particles, add it to the PVDF solution, and stir for 3 hours; spray the insulating slurry on the active coating, put Oven-dried at 90°C to form an insulating layer on the active coating, thereby obtaining a separator containing an active interlayer.

[0034] The metal lithium is used as the negative electrode, and the carbon-sulfur composite material is used as the positive electrode, and the diaphragm containing the active interlayer prepared above ...

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PUM

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Abstract

The invention discloses a diaphragm containing an active interlayer, a preparation method and application thereof. The diaphragm contains the active interlayer and an insulating layer and a base film layer which are adhered to the upper surface and the lower surface of the active interlayer respectively, wherein the base film layer plays the roles of insulation and supporting; active substances are contained in the active interlayer; and the active substances are selected from one or more of I2, S, V2O5, MoO3, MnO2, Bi2O3, Bi2Pb2O5, CFx (x being greater than or equal to 0 and smaller than or equal to 1.5), CuCl2, CuF2, CuO, CuS, FeS, FeS2, Ni2S2, AgCl, Ag2CrO4. The diaphragm disclosed by the invention is provided with the base film layer, the active interlay capable of reacting with lithium dendrites, and the insulating layer, and the active interlayer can react with the lithium dendrites to generate an inert product, so that the diaphragm is used for performing active attack converted from passive resistance on the lithium dendrites, and the generated inert product also can further improve the mechanical strength of the diaphragm. According to the diaphragm disclosed by the invention used for lithium ion batteries or metal lithium batteries, the generation of the lithium dendrites can be obviously inhibited, so that the specific discharge capacity of the battery is improved, and the cycle performance of the battery is greatly promoted.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and in particular relates to a novel separator for lithium ion batteries or metal lithium batteries and a preparation method thereof. Background technique [0002] With the increasingly severe energy and environmental problems in today's world, people's demand for clean, efficient and renewable energy continues to increase, and the efficient conversion and storage of energy has also attracted increasing attention. High energy density and environmentally friendly lithium-ion batteries and lithium metal batteries have become an important research direction in recent years. However, both lithium-ion batteries and metal lithium batteries have lithium dendrite problems, and metal lithium batteries are more serious. During the cycle, the lithium dendrites produced by the negative electrode pierced the separator and caused a short circuit of the battery, affecting the battery lif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M10/0525H01M50/411H01M50/417H01M50/431H01M50/44H01M50/443H01M50/451H01M50/457H01M50/489
CPCH01M10/052H01M10/0525H01M50/409H01M50/403Y02E60/10
Inventor 裴海娟刘雯李永郭瑞白清友王勇潘宇毛亚解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
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