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Novel nickel-hydrogen battery diaphragm

A nickel-metal hydride battery and separator technology, applied in the field of separators for batteries, can solve the problems of unsuitability for manufacturing nickel-hydrogen power batteries, easy carbonization of ultra-fine fibers, low charge retention rate, etc., and achieves excellent charge retention capability, The effect of homogenizing pore size and reducing internal resistance

Active Publication Date: 2012-07-11
莱州联友金浩新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with publication number CN1747199A "Preparation method and product of a nickel-metal hydride battery diaphragm" discloses a polyolefin fiber diaphragm containing low-density polyethylene, which uses concentrated sulfuric acid for sulfonation treatment process. The temperature and time control requirements are very strict, and the use of concentrated sulfuric acid as a reagent will produce a large amount of waste acid, and the treatment cost is high and the cost is high
Publication No. CN1294416A of the Chinese patent "battery diaphragm and extremely battery" uses two types of materials, methylpentene and polyolefin, and a diaphragm made of segmented microfibers, and uses oleum and other sulfonating agents. Sulfonated treatment, the superfine fiber is easy to carbonize, the strength of the diaphragm is reduced, and the production cost is relatively high
[0006] The monomer grafted diaphragm circulating in the market today has a very small internal resistance, which is suitable for the needs of high-current discharge of the battery, but the charge retention rate is very low, so it is not suitable for the manufacture of nickel-metal hydride power batteries, especially for automotive nickel-metal hydride batteries.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] The fiber materials are compounded according to the weight ratio, that is, polyolefin sheath-core fiber, fiber fineness 0.8dtex, length 38mm, content 70%; polypropylene fiber, fineness 1.1dtex, length 38mm, content 25%; polypropylene fiber, fineness 0.3 dtex, length 38mm, content 5%, the above fibers are formed by dry carding process, reinforced by spunlace, dried in hot air at 120 ℃, adjusted to a certain thickness with a rolling mill, and made into diaphragm base cloth, diaphragm base cloth Surface density is 50g / m 2 .

[0022] The diaphragm base cloth is transported to the sulfonation reactor, and sulfonated with 95% concentration of gaseous sulfur trioxide, and the sulfonated base cloth is transported to the alkali washing tank for neutralization reaction, and the concentration of potassium hydroxide is 2%. The alkali cleaning speed is controlled at 15 m / min, and then rinsed with deionized water, rolled, and dried at a temperature of 100°C to obtain a diaphragm bas...

Embodiment 2

[0026] Polyolefin sheath-core fibers are used to make diaphragm base fabrics, the fiber fineness is 0.8dtex, and the fiber length is 2mm to 15mm. The thickness of the base fabric is adjusted through beating, sizing, molding, spunlace, and drying using wet papermaking technology. , made into a diaphragm base fabric with a surface density of 50g / m 2 , and then processed by the sulfonation and chemical grafting treatment method and order of Example 1, to obtain a surface density of 55g / m 2 , a new type of Ni-MH battery separator with a thickness of 0.12mm, a sulfonation degree of 0.7%, and an O / C of 0.041.

Embodiment 3

[0028] The diaphragm base fabric is made of polypropylene fiber, wherein the polypropylene fiber with a fineness of 1.1dtex and a length of 38mm accounts for 95%; the polypropylene fiber with a fineness of 0.3dtex and a length of 38mm accounts for 5%, and the above fibers are carded by dry method Process molding, spunlace reinforcement, drying in hot air at 130°C, adjusting to a certain thickness with a rolling mill, and making a diaphragm base cloth, the surface density of the diaphragm base cloth is 55g / m 2 .

[0029] Put the diaphragm base into the grafting modification solution, the weight concentration of the monomeric acrylic acid is 3%, add the initiator, carry out the sufficient polymerization and grafting reaction at 95°C, wash with deionized water, and dry to obtain For the diaphragm base cloth with a graft ratio of 3%, the thickness of the base cloth is adjusted once more with a rolling mill.

[0030] Transfer the adjusted thickness of the grafted diaphragm base cl...

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Abstract

The invention relates to a diaphragm for batteries, in particular to a novel nickel-hydrogen battery diaphragm. The novel nickel-hydrogen battery diaphragm comprises a diaphragm base fabric and sulfonic acid group. The sulfonic acid group is uniformly grafted on the surface of the diaphragm base fabric by sulfonation. The novel nickel-hydrogen battery diaphragm further comprises an acrylic acid monomer. The acrylic acid monomer is uniformly grafted on the surface of the diaphragm base fabric through a chemical grafting reaction. The diaphragm base fabric is prepared from polyolefin sheath-core type fiber or polypropylene fiber or polyolefin sheath-core type fiber and polypropylene fiber. The diaphragm base fabric is shaped by a wet process paper-making technology or a dry process carding technology and is reinforced by spunlace process. The novel nickel-hydrogen battery diaphragm disclosed by the invention has the characteristics of high chemical stability, strong oxidation resistance and high strength. The diaphragm has permanent hydrophilicity and liquid maintaining performance, improves ionic migration capacity and ion exchange capacity, effectively reduces internal resistance, improves large current discharging capacity and has excellent charge maintaining capacity.

Description

technical field [0001] The invention relates to a separator for batteries, in particular to a novel nickel-hydrogen battery separator. Background technique [0002] At present, the development of the automobile industry is facing many pressures, and the development of energy-saving and environmentally friendly new energy vehicles has become the consensus of automobile manufacturers all over the world. Ni-MH battery is currently the only battery system that has been actually verified and commercialized and scaled up in the battery system used in hybrid electric vehicles. All hybrid electric vehicles that have been mass-produced in the world use nickel-hydrogen battery systems. In the field of nickel-metal hydride batteries, my country has advantages in both technology and resources. Among them, the performance of nickel hydroxide is world-leading, rich in rare earth resources, and has unique resource advantages. The development of nickel-hydrogen batteries for vehicles is cur...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 方开东徐继亮
Owner 莱州联友金浩新型材料有限公司
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