Composite separator and application thereof in lithium ion battery

A lithium-ion battery and composite diaphragm technology, applied in the field of electrochemistry, can solve the problems of no ion conductivity, low processability, and high hardness of the composite diaphragm, achieve high electrolyte wettability, and improve the effect of capacity retention

Inactive Publication Date: 2017-08-25
南通中航泛能新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But currently used Al 2 o 3 , SiO 2 、TiO 2 Inorganic ceramic materials represented by ect., etc. have no ionic conductivity, and will cause the hardness of the composite diaphragm to be very high, so that the knife edge is seriously damaged when the diaphragm is cut, and the workability is low; although there are other materials with strong water absorption, these materials are heated. Long drying time to remove water, resulting in increased production cost of Li-ion batteries

Method used

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  • Composite separator and application thereof in lithium ion battery
  • Composite separator and application thereof in lithium ion battery
  • Composite separator and application thereof in lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Preparation of Composite Diaphragm 17:

[0084] Put commercially available lithium phosphate, sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) into deionized water and acetone (3:1, v : In 10 mL of the mixed solution of v), ball mill the obtained slurry overnight, ultrasonically disperse the mixed slurry for 20 minutes, and evenly coat the obtained slurry on one side of a common commercially available 16 μm PE diaphragm 171 with a silk stick. Preheat with an electric heating plate at 60°C, wait for most of the solvent to volatilize, put it in a vacuum oven and dry at 60°C overnight to completely remove the solvent, and obtain a lithium phosphate-coated single-sided composite separator 17, in which the thickness of the lithium phosphate layer is about 4 μm.

[0085] Preparation of lithium-ion battery 1:

[0086] Fabrication of electrodes: Firstly, the positive electrode 13 is fabricated. In 94 parts by mass of lithium manganate (LiMn 2 o 4), mix...

Embodiment 2

[0091] Magnetron Sputtering of Nitrogen-Containing Lithium Phosphate Li under Nitrogen Atmosphere 3.3 PO 3.9 N 0.17 (LiPON) compounds. Put the synthetic nitrogen-containing lithium phosphate and sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) into deionized water and ethanol (3:1, v : In 10 mL of the mixed solution of v), a nitrogen-containing lithium phosphate-coated single-sided composite separator 17 and a battery 1 with a nitrogen-containing lithium phosphate layer thickness of 4 μm were prepared in the same manner as in Example 1.

Embodiment 3

[0093] A lithium phosphate-coated single-sided composite separator 17 having a lithium phosphate layer thickness of 2 μm was prepared in the same manner as in Example 1, and a lithium ion battery 1 using the separator 17 was prepared in the same manner as in Example 1.

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Abstract

The invention discloses a composite separator for a lithium ion battery. The composite separator comprises a microporous base membrane and a ceramic layer coating one or two sides of the microporous base membrane, wherein lithium-containing phosphate is the main ingredient of ceramic powder in the ceramic layer. The composite separator can be used for effectively improving the electrolyte wettability, ionic conductivity, thermal stability and machinability of a membrane. A lithium ion battery containing the composite separator can be used as a driving power supply of a mobile phone, a laptop computer or an electric automobile.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a composite separator for a lithium ion battery and a lithium ion battery comprising the composite separator. Background technique [0002] At present, chemical power systems using liquid electrolytes, such as lithium-ion batteries, need to use diaphragm materials to block the positive and negative electrodes to avoid short circuits. The diaphragm material is mainly a polymer film or non-woven fabric with a microporous structure, such as polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), etc. as the main material. Liquid electrolyte (generally a carbonate organic solvent containing electrolyte salt) exists in the microporous structure to realize the conduction of ions between the positive and negative electrodes. The separator and liquid electrolyte constitute the electrolyte system. [0003] With the development of electric vehicles, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M2/14H01M10/0525H01M50/403H01M50/434H01M50/449H01M50/489H01M50/497
CPCH01M10/0525H01M50/431H01M50/403H01M50/463H01M50/411Y02E60/10
Inventor 何新华黄金跃马江峰
Owner 南通中航泛能新材料有限公司
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