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Production method of lithium ion battery separator paper

A technology of lithium-ion batteries and production methods, which is applied in pulp beating methods, battery components, paper, etc., can solve problems such as poor electrolyte affinity, battery fire, and poor dimensional stability, and achieve improved mechanical properties and durability. Effects of thermal performance, increased safety, thermal stability and improved wetting properties

Active Publication Date: 2016-09-07
ZHEJIANG JINCHANG SPECIALTY PAPER CO LTD
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Problems solved by technology

[0003] At present, the lithium-ion battery separators on the market are mainly polyolefin microporous stretched films represented by polyethylene (PE) and polypropylene (PP), but due to the porosity and liquid absorption of stretched films made of polyolefins And the specific surface energy is low, the affinity for the electrolyte is poor, and it shows strong heat shrinkage above 100°C, and the dimensional stability is poor, which can easily cause the positive and negative electrodes of the battery to contact, short circuit, and generate a lot of heat instantly. Cause the battery to catch fire and explode, affecting the safety of the power battery

Method used

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  • Production method of lithium ion battery separator paper
  • Production method of lithium ion battery separator paper
  • Production method of lithium ion battery separator paper

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with specific examples.

[0014] refer to figure 1 , which includes the following steps:

[0015] 1. Raw material preparation: the wood pulp is bleached coniferous wood pulp, and the wood pulp fiber with a length of about 3-5mm is processed by a beating process with a disc refiner. The preferred beating degree is about 50-60°SR. The addition of wood pulp is beneficial Paper machine performance needs. The dissolving pulp containing more than 90% of α-cellulose is treated with a disc refiner and beater, and the beating degree is preferably 50-60°SR. Its addition is convenient for paper drawing and can improve the oxidation resistance of the separator. The fineness of nanocellulose is about 0.1dtex to 0.3dtex.

[0016] 2. Mix wood pulp, dissolving pulp, and nanocellulose according to the mass ratio of 1:1:3, and send the uniformly mixed pulp into the flow delivery system, before the headbox or headbox...

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Abstract

The invention relates to a production method of a lithium ion battery separator paper. The method is characterized by comprising the steps of: preparing raw materials of coniferous wood bleached pulp, a dissolving pulp containing alpha-cellulose of above 90%, and nano cellulose; B, uniformly mixing wood pulp, dissolving pulp and nano cellulose in the mass ratio of 1:1:3, sending the mixed slurry into an approaching system, adding polyethylene glycol oxide C before a high level box or a flow box in a flowing system, and conducting papermaking and forming in a papermaking machine; and D, conducting drying and press polish to prepare the nano cellulose lithium battery separator paper. The nano cellulose lithium ion battery separator paper has improved thermal stability and wettability; and high hydrophilicity and high temperature resistant ceramic coating on the surface of nano cellulose lithium ion battery separator paper can improve the mechanical properties and heat resistance performance of the separator, well prevent diaphragm puncture in the formation of lithium branch crystal, thereby increasing the safety.

Description

technical field [0001] The invention relates to a production method of lithium-ion battery diaphragm paper. Background technique [0002] As one of the key components of lithium battery products, diaphragm is highly valued by the state in the new material industry for its production and use. Lithium-ion battery separator is a porous insulating layer with a thickness of generally 8-40um. It plays a role in the battery to prevent the contact between the positive electrode and the negative electrode, prevent short circuit, and absorb the electrolyte in the battery to ensure high ionic conductivity. It plays an important role in stopping the battery reaction when an abnormality occurs and improving the safety performance of the battery. [0003] At present, the lithium-ion battery separators on the market are mainly polyolefin microporous stretched films represented by polyethylene (PE) and polypropylene (PP), but due to the porosity and liquid absorption of stretched films mad...

Claims

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Application Information

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IPC IPC(8): D21H17/53D21H19/20D21H19/14H01M2/14D21D1/02D21F1/00D21F3/00D21F5/00D21G1/00D21H11/02H01M50/403
CPCD21D1/02D21F1/00D21F3/00D21F5/00D21G1/00D21H11/02D21H17/53D21H19/14D21H19/20H01M50/403Y02E60/10
Inventor 毛慧敏李双晓童树华华飞果陈杰孟育龙建丰
Owner ZHEJIANG JINCHANG SPECIALTY PAPER CO LTD
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