A constitution method of a lithium ion battery diaphragm surface supermolecule membrane

A technology of lithium-ion batteries and supramolecular membranes, which is applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as decreased ion conductivity, increased lithium ion migration resistance, and blockage of diaphragm pores, achieving increased mechanical performance effect

Active Publication Date: 2014-10-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating applied on the surface of the diaphragm by the coating method is often relatively thick, and the diaphragm forms a similar "sandwich" structure. In addition, the use of too thick a coating and an adhesive can easily cause the pores of the diaphragm to be blocked, although the follow-up usually adopts the same method. The transfer method forms a microporous structure in the surface coating of the separator, but the pore permeability of the separator decreases, which easily increases the resistance of lithium ion migration and negatively affects the electrochemical performance of the battery.
For example, Lee et al. (Journal of Power Sources, 2011, 196: 6716-6722.) used the coating method to coat SiO on the surface of the PE separator. 2 /PVDF-HFP coating improves the thermal stability and liquid h

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  • A constitution method of a lithium ion battery diaphragm surface supermolecule membrane
  • A constitution method of a lithium ion battery diaphragm surface supermolecule membrane
  • A constitution method of a lithium ion battery diaphragm surface supermolecule membrane

Examples

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Example Embodiment

[0028] Example 1: The polyolefin membrane is first subjected to plasma treatment to make its surface carry carboxyl groups. Then, it was immersed in a PEI aqueous solution with a concentration of 1 mg / ml for 20 minutes, and then immersed in deionized water for 3 times, each for 1 minute. Then, it was immersed in a water / methanol mixed solution of a PAA polyanion compound with a concentration of 0.03 mg / ml for 10 minutes, and then immersed in a water / methanol mixed solvent 3 times, each for 1 minute. Finally, put the polyolefin membrane into ZrO with a concentration of 1mg / ml with amino groups on the surface 2 Soaked in the sol for 10 minutes, and then immersed in deionized water for 3 times, 1 minute each time, thus completing PAA and ZrO 2 One cycle of assembly, repeat the above steps to assemble multiple cycles of PAA and ZrO 2 After that, the polyolefin membrane was soaked in HA or ALG aqueous solution with a concentration of 0.05 mg / ml for 10 minutes, and then immersed in de...

Example Embodiment

[0029] Example 2: The polyolefin membrane was first subjected to plasma treatment, then immersed in a PEI aqueous solution with a concentration of 1 mg / ml for 20 minutes, and then immersed in deionized water for 3 times, each for 1 minute. Next, put in SiO with a carboxyl group concentration of 10mg / ml on the surface 2 Soak in the sol for 10 minutes, and then immerse in deionized water for 3 times, each for 1 minute. Finally, put the polyolefin membrane into a PAH polycationic compound aqueous solution with a concentration of 1 mg / ml and soak for 10 minutes, and then immerse it in deionized water for 3 times, each time for 1 minute, thus completing the SiO 2 Repeat the above steps for multiple cycles of assembly with PAH. Subsequently, the modified polyolefin membrane was immersed in a chemical cross-linking solvent EDC (1-ethyl-3-carbodiimide hydrochloride) and NHS (N-hydroxysuccinimide) solution with a concentration of 0.1M In 24h.

Example Embodiment

[0030] Example 3: The polyolefin membrane was first subjected to plasma treatment, and then immersed in a PEI aqueous solution with a concentration of 0.5 mg / ml for 20 minutes, and then immersed in deionized water for 3 times, each for 1 minute. Next, put in Al with a carboxyl group concentration of 1mg / ml on the surface 2 O 3 Soak in the sol for 10 minutes, and then immerse in deionized water for 3 times, each for 1 minute. This completes PEI and Al 2 O 3 One cycle of assembly, repeat the above steps to assemble multiple cycles of PEI and Al 2 O 3 After that, the polyolefin membrane was immersed in a PAH or CS aqueous solution with a concentration of 0.1 mg / ml for 10 minutes, and then immersed in deionized water for 3 times, each for 1 minute. Finally, the modified polyolefin diaphragm is immersed in a 0.1M chemical crosslinking solvent EDC (1-ethyl-3-carbodiimide hydrochloride) and NHS (N-hydroxysuccinimide) solution In 24h.

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Abstract

The invention relates to a constitution method of a lithium ion battery diaphragm surface supermolecule membrane. Organic and inorganic constitution units with high thermal stability, high mechanical strength and hydrophilic polar functional groups are adopted. An organic-inorganic composite supermolecule membrane is alternatively assembled onto the polyolefin diaphragm surface and the pore inner surface by a layer-by-layer self-assembly method based on molecule interfaces. By fine regulation and control of the thickness, the constitution, the structure and surface characteristics of the supermolecule membrane at the molecule level, the thermal stability, mechanical strength and the ionic conductivity of the diaphragm are improved, thus enhancing the safety and electrochemical properties of the lithium ion battery.

Description

technical field [0001] The invention relates to a layer-by-layer self-assembly method and a supramolecular film on the surface of a lithium ion battery diaphragm prepared by the method. The supramolecular film used on the surface of the lithium battery diaphragm can improve the thermal stability, mechanical properties and liquid holding rate of the diaphragm. Background technique [0002] As one of the key inner components of lithium-ion batteries, the diaphragm can isolate the positive and negative electrodes to prevent short circuit, while allowing the conduction of lithium ions; when overcharging or temperature rises, the diaphragm blocks current conduction by closing the pores to prevent explosion. The performance of the separator determines the retention of the electrolyte, the size of the internal resistance of the battery, and the composition of the battery interface structure, which directly affects the safety performance and key characteristics of the l...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 施利毅王竹仪袁帅赵尹张美红
Owner SHANGHAI UNIV
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