Novel lithium ion battery separating membrane and preparation method thereof

A technology for lithium-ion batteries and diaphragms, applied in the field of preparing lithium-ion battery diaphragms

Active Publication Date: 2014-01-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0011] The invention provides a novel lithium-ion battery diaphragm and a preparation method thereof to solve various shortcomings and deficiencies in the prior art

Method used

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  • Novel lithium ion battery separating membrane and preparation method thereof

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preparation example Construction

[0033] The preparation method of novel lithium-ion battery diaphragm of the present invention comprises the following processing steps:

[0034] (1) Soak the cotton fiber in water for 2-8 hours, thaw out, and beat to obtain cotton pulp with a beating degree of 60°SR-80°SR;

[0035] (2) Wash the polypropylene fiber with sodium dodecylbenzenesulfonate and dry it;

[0036] (3) Mix the cotton pulp in the first step with the polypropylene fiber in the second step according to the mass ratio, add dispersants, adhesives, retention aids and aids, add water to dissolve and mix to form a slurry;

[0037] (4) The obtained slurry is dehydrated through a copper mesh, squeezed, and then dried by a drying cylinder;

[0038] (5) Hot pressing at 135°C to 150°C to obtain a finished diaphragm.

[0039] In order to improve the lyophilic performance and porosity of the lithium-ion battery separator, the present invention adopts a wet papermaking process, using cotton fibers and polypropylene fib...

example 1

[0042] Step 1. Soak 360g of cotton fiber in 5L of water for 4 hours, add 18L of water into the pulp tank of the beater, and pressurize the cotton fiber for beating. Measure the degree of beating every 10 minutes. °, 75°, 80° cotton pulp for use.

[0043] Step 2: washing the polypropylene fiber with sodium dodecylbenzene sulfonate to remove the grease on the surface of the polypropylene fiber, and then drying the fiber at a temperature of 50°C to 60°C.

[0044] Step 3. According to the quantitative ratio of 40g / m3~50g / m3, mix the slurry in step 1 and the polypropylene fiber material in step 2 in a mass ratio of 2:1, and then add 0.5% dispersant and 5% glue Viscosity agent, 0.5% flow aid and filter aid, water is added to dissolve and disperse the fibers and mix them evenly to obtain a slurry.

[0045] Step 4: Dehydrate the slurry prepared in Step 3 through a copper mesh, then press to remove excess water in the paper, and then dry it in a drying cylinder at 120°C to obtain a di...

example 2

[0048] Step 1. Soak 360g of cotton fiber in 5L of water for 4 hours, add 18L of water into the pulp tank of the beater, and pressurize the cotton fiber for beating. Measure the degree of beating every 10 minutes. °, 75°, 80° cotton pulp for use.

[0049] Step 2: washing the polypropylene fiber with sodium dodecylbenzene sulfonate to remove the grease on the surface of the polypropylene fiber, and then drying the fiber at a temperature of 50°C to 60°C.

[0050] Step 3. According to the quantitative ratio of 40g / m3~50g / m3, mix the cotton pulp and polypropylene fiber material at a mass ratio of 1:1, and then add 1.0% dispersant, 8% adhesive, and 1.0% flow aid Filter aid, add water to loosen and disperse the fibers and mix evenly to obtain a slurry.

[0051] Step 4: Dehydrate the slurry prepared in Step 3 through a copper mesh, then press to remove excess water in the paper, and then dry it in a drying cylinder at 120°C to obtain a diaphragm.

[0052] Step 5. Hot pressing the abov...

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Abstract

The invention relates to a novel lithium ion battery separating membrane and a preparation method thereof. The separating membrane uses cotton fibers and polypropylene fibers as principal materials and is obtained by wet-method paper-making process. The lithium ion battery separating membrane provided by the invention has the advantages of good lyophilic property, good heat stability, high porosity, uniform pore distribution, small pore size and the like and overcomes the technical defects that the conventional battery separating membrane has poorer lyophilic property, good heat stability and low porosity.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing lithium-ion battery diaphragms by using polypropylene fibers and cotton fibers as main raw materials. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, no memory effect, safety, reliability, and fast charging and discharging. The positive electrode material, negative electrode material, diaphragm, and electrolyte are the four types of lithium-ion batteries. key material. [0003] Lithium-ion battery separator plays the role of electronic insulation between the positive and negative electrodes of the battery, and at the same time provides a microporous channel that allows lithium ions to reciprocate freely between the positive and negative electrodes. The separator is an important component that affects the performance of lithium-ion batteries. Battery capacity, internal resistance, high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/44H01M50/489
CPCH01M50/446H01M50/403Y02E60/10
Inventor 张雄飞陈启杰申飞燕
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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