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EVOH-NCC-SO3Li single ion polymer

A single ion and polymer technology, applied in electrical components, circuits, battery pack components, etc., can solve problems such as electrolyte leakage, fire, and low melting point of the diaphragm

Inactive Publication Date: 2018-11-06
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercialized lithium battery separator is a type of microporous film made of polyolefin materials. This type of separator has good mechanical properties, but it has poor affinity for the electrolyte with strong polarity, which is easy to cause electrolysis. liquid leakage; in addition, the low melting point of the diaphragm can easily cause a short circuit in the battery, which will cause safety problems such as smoke, fire or even explosion in the battery, endangering personal and property safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] EVOH-NCC-SO 3 Li single ion polymer, comprises the steps:

[0013] (1) Activation of NCC (nanocellulose)

[0014] (2) NCC grafted EVOH (polyethylene-vinyl alcohol copolymer)

[0015] (3) EVOH-NCC-SO 3 Preparation of Li solid

[0016] (4) Electrospun EVOH-NCC-SO 3 Preparation of Li nano-nonwovens

[0017] 1. EVOH-NCC-SO 3 Li single-ion polymer, described in "(1) Activation of NCC (nanocellulose)": Weigh 0.08 g NCC and 10 ml DMAc (N,N-dimethylacetamide) into a glass bottle with a rotor At the same time, 0.1 g CDI (N, N-carbonyldiimidazole) was added to the bottle in small amounts and stirred for 12 hours in a magnetic stirrer to fully activate the nanocellulose.

[0018] 2. EVOH-NCC-SO 3 Li single-ion polymer, the "(2) NCC grafted EVOH (polyethylene-vinyl alcohol copolymer)": Weigh 10 g EVOH particles into a 500 ml three-necked bottle filled with 60 ml DMAc solvent, Extract the activated NCC suspension with a disposable 20 ml needle, inject it into a 500 ml three...

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Abstract

The invention discloses a preparation method of a novel EVOH-NCC-SO3Li single ion polymer. The method comprises the following steps of 1 activating NCC (nano-crystalline cellulose); 2 grafting EVOH (ethylene-vinyl alcohol copolymer) to NCC; 3 preparing an EVOH-NCC-SO3Li solid; and 4 preparing an electrospun EVOH-NCC-SO3Li nano non-woven fabric. In this way, the novel EVOH-NCC-SO3Li single ion polymer lithium battery diaphragm with the high performance can be prepared.

Description

technical field [0001] EVOH (polyethylene-vinyl alcohol copolymer) is a superior polymer with high barrier properties, non-toxic environmental protection and good processing performance. There are a large number of polar hydroxyl groups in EVOH, which has good wettability with polar electrolyte and good liquid storage. However, the nano non-fabric prepared by electrospinning generally has the problem of poor mechanical properties. The present invention uses NCC (nanometer cellulose) as a reinforcement to further graft and modify EVOH, and at the same time carry out sulfonation of the grafted product treatment to obtain a novel EVOH-NCC-SO 3 Li single ion polymer. There are a large number of polar hydroxyl groups on the surface of nanocellulose. Activate nanocellulose with CDI (N, N-carbonyldiimidazole) to increase more reaction sites on nanocellulose, and then carry out graft crosslinking reaction with EVOH , to increase the mechanical properties of EVOH by cross-linking an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16C08G81/02
CPCC08G81/02H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 巩桂芬徐阿文樊文倩
Owner HARBIN UNIV OF SCI & TECH
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