18650 rechargeable battery lithium 3.7v 3500mah
CH
About Us
Company Profile Development History Sales Network Partner Social Responsibility
Products
Rechargeable Battery Battery Packs Energy Storage Battery Primary Battery Handicraft Article
Subsidiary Company
SINO TECHNOLOGY SUNBEAM GREEN POWER DATAPOWER SEONG-HEE STD
Honor
Qualification Certificate Patent Certificate Honor Certificate
R&D
R&D Center Test Center
News
Company News Industry News
Contact Us
Other information
product
polymer lithium battery Primary battery Rechargeable Battery LR03 alkaline battery
18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah

Other information

Home  >  Other information

LR03 battery.Research progress on lithium-ion battery separator materials?

release time:2024-03-12 Hits:     Popular:AG11 battery

  Research progress on lithium-ion battery separator materials?

  The difficulty of diaphragm technology lies in the engineering technology of creating holes and the preparation of matrix materials. The hole-making engineering technology includes membrane hole-making technology, production equipment and product stability. Matrix material preparation includes the preparation and modification technology of polypropylene, polyethylene materials and additives. The difficulties in hole-making engineering technology are mainly reflected in insufficient porosity, uneven thickness, and poor strength. This article mainly compares the performance of separators prepared by different processes.

  In the structure of lithium-ion batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the battery's capacity, cycle and safety performance. Separators with excellent performance play an important role in improving the overall performance of batteries.

  The difficulty of diaphragm technology lies in the engineering technology of creating holes and the preparation of matrix materials. The hole-making engineering technology includes membrane hole-making technology, production equipment and product stability. Matrix material preparation includes the preparation and modification technology of polypropylene, polyethylene materials and additives. The difficulties in hole-making engineering technology are mainly reflected in insufficient porosity, uneven thickness, and poor strength. This article mainly compares the performance of separators prepared by different processes.

  2 Preparation method of lithium-ion battery separator

  Polyethylene (PE) and polypropylene (PP) microporous membranes have higher porosity, lower resistance, higher tear strength, better acid and alkali resistance, good elasticity and resistance to aprotic solvents. It maintains performance, so it is used as a separator material in the early stages of lithium-ion battery research and development. The currently marketed lithium-ion battery separators mainly include single-layer PE, single-layer PP, and 3-layer PP/PE/PP composite films. Lithium-ion battery separators can be divided into two categories: dry method and wet method according to different preparation processes, and the pore formation mechanisms of the separator micropores are different [1~2].

  2.1 Dry process

  In the dry method, polyolefin resin is melted, extruded, and blown into a crystalline polymer film. After crystallization and annealing, a highly oriented multilayer structure is obtained, which is further stretched at high temperature to peel off the crystalline interface. , forming a porous structure that can increase the pore size of the film. Dry stretching can be divided into dry uniaxial stretching and biaxial stretching according to different stretching directions.

  The dry uniaxial stretching process uses hard elastic fibers to prepare highly oriented PE or PP separators with low crystallinity, and then anneales them at high temperature to obtain oriented films with high crystallinity. This film is first stretched at low temperatures to form defects such as silver streaks, and then stretched at high temperatures to form micropores. At present, Celgard Company in the United States and Ube Company in Japan use this process to produce single-layer PE, PP and 3-layer PP/PE/PP composite films. The separator produced by this process has an elongated microporous structure. Since it is only stretched in one direction, the transverse strength of the separator is relatively poor, but there is almost no thermal shrinkage in the transverse direction.

  2.2 Wet process

  The wet method is also called phase separation method or thermally induced phase separation method. Liquid hydrocarbons or some small molecular substances are mixed with polyolefin resin. After heating and melting, a uniform mixture is formed. Then the temperature is lowered for phase separation, and the film is obtained by pressing. The membrane is heated to a temperature close to the melting point, stretched in two directions to orient the molecular chains, and finally kept warm for a certain period of time. The residual solvent is eluted with volatile substances to prepare interconnected microporous membrane materials. This method is applicable to a wide range of materials. . Companies that adopt this method include Asahi Kasei, Toran, and Nitto of Japan and Entek of the United States [5]. The pore size range of the separator produced by the wet biaxial stretching method is in the order of magnitude of the phase microscopic interface, which is relatively small and uniform. The stretch ratio in both directions can reach 5 to 7, so the separator performance is isotropic, the transverse tensile strength is high, and the puncture strength is high. The normal process flow will not cause perforation, and the product can be made thinner, increasing the energy density of the battery. higher.


Read recommendations:

701224 145mAh 3.7V

Development of new batteries.rechargeable battery 18650 3.7v

Classification of ternary lithium ion batteries

AA NiMH battery price

18650 rechargeable battery lithium 3.7v 3500mah

Last article:LR1130 battery.Discussing the debate on the BMS balancing technology route for electric vehicle powe

Next article:LR03 alkaline battery.How can the reliability of energy storage battery management systems be improv

Popular recommendation

18650 lithium ion battery

2023-03-22

NiMH battery packs direct sales

2023-03-22

battery 18650 genuine

2023-03-22

40v lithium battery pack Vendor

2023-05-09

AAA Ni-MH batteries

2023-03-22

14500 850mAh 3.7V

2022-06-20

No.1 card-mounted carbon battery R20

2023-06-28

L822 32A/29A

2022-10-09

Home energy storage battery FBC-HS03

2022-11-04

803040 1000mAh 3.7V

2022-08-19

501825 180mAh 3.7V

2022-07-01

Hanging neck fan

2022-09-22

551521 130mAh 3.7V

2022-07-01

LR6

2022-11-16

521133 160mAh 3.7V

2022-08-19

cr2032 3v lithium battery

2023-06-25

li ion 18650 battery pack wholesale

2023-06-25

602535 battery

2023-06-25

18650 lithium battery 3000mah

2023-06-25

21700 battery

2023-06-25

3.2v 30ah lifepo4 battery cell.Power lithium batteries gradually reach production capacity, and lith

2023-10-17

High-efficiency solar cell growth soars; conversion technology is key

2024-01-24

Mobile lithium battery.902030 polymer battery

2023-05-19

Equipment for Lithium - Battery Cell Consistency Detection

2025-09-16

Analysis of the charging and discharging mechanisms of lithium batteries

2024-05-09

What are the main components of lithium battery electrolyte?

2022-11-22

What are the popular product advantages of large capacity lithium batteries!18650 battery 3500mah li

2023-08-26

18650 battery 3.7v 1800mah.What are the advantages of lithium battery manufacturers

2023-10-12

lithium 3400mah 3.7v 18650 battery.Lithium battery power supply system monitoring circuit analysis

2023-10-14

What are the power batteries?lithium battery for solar energy storage system company

2023-05-06
360° FACTORY VR TOUR
lithium ion battery 18650 priceWhatsapp
lithium ion battery 18650 price

lithium ion battery 18650 priceTel
+86 19925278095

lithium ion battery 18650 priceEmail
admin@sino-techgroup.com

TOP