Cellulose based gel polymer electrolyte and preparation method thereof, and lithium ion battery containing electrolyte

A cellulose and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of difficult control of membrane structure uniformity, liquid absorption capacity to be improved, and low porosity, and achieve good dimensional and mechanical thermal stability, and electrochemical stability window The effect of wide and strong affinity

Active Publication Date: 2018-05-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, the above-mentioned invention patents often require beating and brooming of cellulose, which consumes a lot of energy and has low efficiency, and it is difficult to control the uniformity of the film structure.
Literature 1 (Li M, Wang X, Wang Y, et al.A gelpolymer electrolyte based on composite of nonwoven fabric and methylcellulose with good performance for lithium ion batteries[J].RSC Advances,2015,5(65):52382-52387 ) and literature 2 (Li M X, Wang X W, Yang Y Q, et al.A densecellulose-based membrane as a renewable host for gel polymer electrolyte oflithium ion batteries[J].Journal of Membrane Science,2015,476:112-118) Reported in cellulose derivatives to prepare a variety of gel polymer electrolyte matrix, showing good thermal stability, good compatibility with electrode materials, but due to the low porosity, the liquid absorption capacity needs to be improved

Method used

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  • Cellulose based gel polymer electrolyte and preparation method thereof, and lithium ion battery containing electrolyte
  • Cellulose based gel polymer electrolyte and preparation method thereof, and lithium ion battery containing electrolyte
  • Cellulose based gel polymer electrolyte and preparation method thereof, and lithium ion battery containing electrolyte

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preparation example Construction

[0030]As mentioned above, the present invention discloses a cellulose-based gel polymer electrolyte and a preparation method thereof. The preparation method includes the following steps: (1) Using cellulose as a raw material, the “dissolution-regeneration” method is used to first prepare Obtain a regenerated cellulose gel film or a regenerated cellulose composite gel film; (2) the gel film is then freeze-dried, supercritically dried or directly dried to obtain a cellulose porous film or a cellulose composite porous film; ( 3) Soak the above-mentioned cellulose porous membrane or cellulose composite porous membrane in an organic electrolyte to absorb the organic electrolyte, and gel it to obtain a cellulose-based gel polymer electrolyte.

[0031] In the above-mentioned preparation method, step (1) specifically comprises the following steps:

[0032] (1a) cellulose is mixed with liquid A to obtain a transparent and uniform cellulose solution;

[0033] (1b) The cellulose solutio...

Embodiment 1

[0072] Add 4g of cotton pulp into a flask containing 96g of 1-allyl-3-methylimidazolium chloride (AmimCl) ionic liquid, heat in an oil bath at 80°C, and apply mechanical stirring under vacuum to dissolve for 2h, namely To obtain a transparent and uniform cellulose / AmimCl solution, cast the obtained cellulose / AmimCl solution on a glass plate to obtain a solution film with a thickness of 300 μm, then put the glass plate in 60% AmimCl ionic liquid / water solution, and take it out after standing for 1 hour. That is, the regenerated cellulose gel film is obtained, cellulose gel film for short. The obtained cellulose gel membrane is repeatedly washed with ethanol until the ionic liquid is completely washed out to obtain a cellulose ethanol gel membrane. The obtained cellulose ethanol gel membrane is dried by a supercritical carbon dioxide drying method to obtain a cellulose porous membrane. The prepared cellulose porous membrane can be further vacuum-dried at 50° C. for 48 h to comp...

Embodiment 2

[0074] 8g microcrystalline cellulose is added in the flask that 92g sodium hydroxide / urea aqueous solution (sodium hydroxide: 7%, urea: 12%) is housed, stirs and dissolves under the condition of-5 ℃, the solution that obtains is in 5000rpm / Centrifuge at a speed of 1 min to obtain a transparent and uniform cellulose solution. Cast the obtained cellulose solution on a glass plate to obtain a solution film with a thickness of 500 μm. Then put the glass plate into secondary water and take it out after standing for 1 hour to obtain regeneration. Cellulose hydrogel membrane, referred to as cellulose hydrogel membrane. The obtained cellulose hydrogel membrane was repeatedly washed with secondary water until the sodium hydroxide and urea were completely washed out to obtain a further optimized cellulose hydrogel membrane. The obtained cellulose hydrogel membrane is dried by a freeze-drying method to obtain a cellulose porous membrane. The prepared cellulose porous membrane can be fu...

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Abstract

The invention discloses a cellulose based gel polymer electrolyte and a preparation method thereof, and a lithium ion battery containing the electrolyte. The gel polymer electrolyte is obtained by absorbing an organic electrolyte solution with a cellulose porous membrane or a cellulose composite porous membrane with a nanopore structure and then gelating. The cellulose porous membrane or cellulosecomposite porous membrane is obtained by a dissolving and regeneration method, the thickness is 20-200 [mu]m, the average pore size is less than 50 nm, the porosity is 30-98%, the tensile strength is3-80 MPa, and the dimensional thermal stability is good; the cellulose based gel polymer electrolyte obtained by adsorbing the organic electrolyte solution and gelating has the advantages of high ionic conductivity, wide electrochemical stability window and the like and is suitable for lithium ion batteries with high performance and high safety.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a cellulose-based gel polymer electrolyte for a lithium ion battery, a preparation method thereof, and a lithium ion battery using the electrolyte. Background technique [0002] Due to the advantages of high energy density, long cycle life, and environmental friendliness, lithium-ion batteries have been widely used in portable electronic devices such as mobile phones and notebook batteries in recent years. They are used in power tools, hybrid electric vehicles, pure electric vehicles and small energy storage power stations And other fields, large-capacity lithium-ion batteries will also play a very important role. However, due to the use of liquid organic electrolyte (volatile and flammable), lithium-ion batteries are prone to fire, explosion and other safety accidents when the liquid electrolyte leaks or encounters accidents such as impact, so the safety of lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 张军万纪强余坚张金明
Owner INST OF CHEM CHINESE ACAD OF SCI
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