Novel nickel-hydrogen battery diaphragm

A nickel-metal hydride battery and diaphragm technology, which is applied in the field of battery diaphragms, can solve the problems of being unsuitable for the manufacture of nickel-hydrogen power batteries, easy carbonization of ultra-fine fibers, and low charge retention rate, and achieves excellent charge retention. Effect of homogenizing pore size and reducing internal resistance

Active Publication Date: 2014-05-21
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
Comparison scheme
Effect test

Embodiment 1

[0021] The fiber materials are batched according to the weight ratio, namely 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 of 5%, the above fibers are formed by dry carding process, spunlace reinforced, dried in hot air at 120 ℃, adjusted to a certain thickness with a rolling mill, and made into diaphragm base cloth, diaphragm base cloth. Area density is 50g / m 2 .

[0022] The diaphragm base cloth is sent to the sulfonation reactor, and the sulfonation treatment is carried out with gaseous sulfur trioxide with a concentration of 95%. The sulfonated base cloth is sent to the alkali washing tank for neutralization reaction. The concentration of potassium hydroxide is 2% The alkali washing speed was controlled at 15 m / min, and then rinsed with deionized water, pressed, and dried.

[0023] Put the sulfonated diaphragm bas...

Embodiment 2

[0026] Using polyolefin skin-core fiber to make diaphragm base fabric, fiber fineness is 0.8dtex, fiber length is 2mm~15mm, using wet papermaking process, through beating, sizing, molding, hydroentanglement, drying, adjust the thickness of the base fabric , made of diaphragm base cloth, with an areal density of 50g / m 2 , and then processed according to the sulfonation and chemical grafting treatment methods and order of Example 1, to obtain an areal density of 55g / m 2 , a new type of nickel-metal hydride battery separator with a thickness of 0.12mm, the degree of sulfonation is 0.7%, and the O / C is 0.041.

Embodiment 3

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

[0029] The diaphragm base is placed in the graft modification solution, the weight concentration of the monomer acrylic acid is 3%, an initiator is added, and the graft reaction is fully polymerized under the condition of 95 ° C, washed with deionized water, and dried to obtain For the separator base fabric with a graft ratio of 3%, the thickness of the base fabric was adjusted again with a rolling mill.

[0030] The grafted diaphragm base cloth with adjusted thickness is sen...

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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. The development of energy-saving and environmentally friendly new energy vehicles has become the consensus of automobile manufacturers all over the world. Nickel-metal hydride batteries are currently the only battery system that has been actually verified, commercialized, and large-scale among the battery systems used in hybrid electric vehicles. In the field of nickel-metal hydride batteries, my country has advantages in both technology and resources. Among them, nickel hydroxide has the world's leading performance, rich rare earth resources, and has unique resource advantages. The development of nickel-metal hydride batteries for vehicles is the most realistic choice at present. [0003] As we all know, the three key materials of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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