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Cellulose nanofibril/metal-organic framework composite lithium ion battery separator and preparation method

A metal-organic framework and nanofibril technology, which is applied in nanotechnology, nanotechnology, secondary batteries, etc., can solve the problems of reduced battery operation performance and service life, uneven size of inorganic fillers, and insufficient adhesion. The preparation method is simple and fast, the price is low, and the wettability is good.

Active Publication Date: 2018-08-21
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of the inorganic filler is not uniform, and because the adhesion is not strong enough, there is no covalent bond between them, the filler is easy to fall off during the operation of the battery, which greatly reduces the operating performance and service life of the battery. Hidden danger

Method used

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  • Cellulose nanofibril/metal-organic framework composite lithium ion battery separator and preparation method
  • Cellulose nanofibril/metal-organic framework composite lithium ion battery separator and preparation method
  • Cellulose nanofibril/metal-organic framework composite lithium ion battery separator and preparation method

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Experimental program
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Effect test

Embodiment 1

[0037] 1) Add 5 g of wood pulp into 90 mL of formic acid with a mass fraction of 80% to disperse, carry out a hydrolysis reaction at 80° C. and 300 rpm under stirring conditions for 8 hours, collect solids in the hydrolyzate through solid-liquid separation, and wash the solids with water until Neutral, after washing, add the aprotic polar organic solvent DMAC for solvent replacement to obtain a cellulose suspension with a mass fraction of 0.3%, for use;

[0038] 2) Homogenize the cellulose suspension obtained above by high pressure, and homogenize the cellulose 10 times under a pressure of 100 MPa to realize the nanonization of cellulose and the partial dissolution of the surface molecules of nanocellulose to obtain viscous cellulose nanofibril suspension;

[0039] 3) Dissolve 0.291g of cobalt nitrate hexahydrate and 0.328g of dimethylimidazole in 10ml of DMAC respectively, and then mix to obtain a metal organic framework precursor solution, and then mix 20ml of the metal orga...

Embodiment 2

[0044] 1) Add 8 g of bleached wheat straw pulp to 100 mL of formic acid with a mass fraction of 83% to disperse, carry out hydrolysis reaction at 85 ° C and 200 rpm under stirring conditions for 6 h, collect solids in the hydrolyzate by solid-liquid separation, and wash the solids with water to neutrality, after washing, add the aprotic polar organic solvent DMSO to carry out solvent replacement, and obtain a cellulose suspension with a mass fraction of 0.35%, which is ready for use;

[0045] 2) Ultrasonic crushing of the obtained cellulose suspension under the condition of 1000W ultrasonic crushing for 75 minutes to achieve nano-nization of cellulose and partial dissolution of nano-cellulose surface molecules to obtain a viscous cellulose nanofibril suspension;

[0046] 3) Dissolve 1.188g of zinc nitrate hexahydrate and 1.312g of dimethylimidazole in 25ml of DMSO respectively, and then mix to obtain a metal organic framework precursor solution, and then mix 50ml of the metal o...

Embodiment 3

[0050] 1) Add 10 g of powdered microcrystalline cellulose to 80 mL of formic acid with a mass fraction of 62% to disperse, perform a hydrolysis reaction at 73° C. and 150 rpm under stirring conditions for 11 hours, and collect solids in the hydrolyzed product through solid-liquid separation. Washing with water to neutrality, after washing, add the aprotic polar organic solvent DMF for solvent replacement, to obtain a cellulose suspension with a mass fraction of 0.45%, and set aside;

[0051] 2) Homogenize the cellulose suspension obtained above by high pressure, and homogenize the cellulose 14 times under a pressure of 90 MPa to realize the nanonization of cellulose and the partial dissolution of the surface molecules of nanocellulose to obtain viscous cellulose nanofibril suspension;

[0052] 3) Dissolve 0.408g of zinc chloride and 0.984g of dimethylimidazole in 40ml of DMF respectively, and then mix to obtain a metal-organic framework precursor solution, and then mix 80ml of...

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Abstract

The invention belongs to the crossing field of lithium battery materials, organic coordination materials and biomass and particularly relates to a cellulose nanofibril / metal-organic framework composite lithium ion battery separator and a preparation method. The separator is prepared from components in percentage by weight as follows: 20wt.%-99wt.% of cellulose nanofibril and 0.1wt.%-80wt.% of a metal-organic framework; the diameter of the cellulose nanofibril is 5-100 nm. The provided composite lithium ion battery separator has the characteristics of high mechanical strength, uniform pore sizedistribution and high binding force between the cellulose nanofibril and the metal-organic framework, has higher ionic conductivity and excellent electrochemical interface stability; the preparationmethod is simple and facilitates large-scale production.

Description

technical field [0001] The invention belongs to the intersection fields of lithium battery materials, organic coordination materials and biomass, and specifically relates to a cellulose nanofibril / metal organic framework composite lithium-ion battery separator and a preparation method thereof. Background technique [0002] With the popularization and high performance of electronic equipment, Lithium-ion battery (LIB) has become the most widely used power source for electronic products, with the advantages of high efficiency, high energy density, and long cycle life. The battery separator is one of the core components of the lithium-ion battery, which plays a role in preventing the short circuit of the positive and negative contacts and providing ion transport channels, which can directly affect the service life and safety of the battery (Journal of Power Sources, 2012, 208, 210- 224). At present, most of the battery separators used in the market are petroleum-based micropor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525B82Y30/00H01M50/403H01M50/411H01M50/44H01M50/489H01M50/491H01M50/494H01M50/497
CPCH01M10/0525B82Y30/00H01M50/4295H01M50/44H01M50/403Y02E60/10
Inventor 吕东李滨刘超冯晓燕吴美燕张跃冬于光
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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