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Semi-solid lithium battery electrolyte and preparation method thereof

A lithium battery and electrolyte technology, which is applied in the field of semi-solid lithium battery electrolyte and preparation, can solve the problems that restrict the development and application of lithium battery solid electrolyte, poor lithium ion conductivity, and affect the performance of lithium battery, so as to achieve the improvement of adsorption capacity and nucleation Good effect and large amount of gas

Active Publication Date: 2020-12-11
上海彤程电子材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the widely used lithium battery solid electrolyte has the problem of poor lithium ion conductivity and low electrical conductivity, which affects the performance of lithium battery and restricts the development and application of lithium battery solid electrolyte.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) First add lithium chloride, yttrium chloride and doping phase M into absolute ethanol, then ball mill at a speed of 300r / min for 40min in a ball mill, and then mix the obtained mixture slurry with adhesive and foaming agent Mix uniformly, press and shape the obtained mixture, and finally sinter to obtain a porous electrolyte membrane; the doping phase M is GeCl 2 ; The binder is carboxymethyl cellulose ether, and the addition of the binder is 1wt% of the total mass of the mixture; the foaming agent is sodium bicarbonate, and the addition of the foaming agent is 1wt% of the total mass of the mixture; sintering adopts Vacuum sintering, the sintering atmosphere is nitrogen, the sintering pressure is 1kPa, the sintering temperature is 550°C, and the sintering time is 4h;

[0026] In each raw material of the mixed slurry, the molar ratio of lithium chloride, yttrium chloride and doped phase M is 3:0.99:0.01; the total mass of lithium chloride, yttrium chloride and doped ...

Embodiment 2

[0031] (1) First add lithium chloride, yttrium chloride and doping phase M into absolute ethanol, then ball mill at a speed of 400r / min for 30min in a ball mill, and then mix the obtained mixture slurry with adhesive and foaming agent Mix uniformly, press and shape the obtained mixture, and finally sinter to obtain a porous electrolyte membrane; the doping phase M is SnCl 2 ; The binder is cyanoacrylate, and the addition of the binder is 5wt% of the total mass of the mixture; the foaming agent is ammonium carbonate, and the addition of the foaming agent is 5wt% of the total mass of the mixture; sintering adopts vacuum sintering, The sintering atmosphere is nitrogen, the sintering pressure is 2kPa, the sintering temperature is 600℃, and the sintering time is 2h;

[0032] Among the raw materials of the mixed slurry, the molar ratio of lithium chloride, yttrium chloride and doped phase M is 3:0.96:0.04; the total mass of lithium chloride, yttrium chloride and doped phase M is the...

Embodiment 3

[0037] (1) First add lithium chloride, yttrium chloride and doping phase M into absolute ethanol, then ball mill at a speed of 350r / min for 35min in a ball mill, and then mix the obtained mixture slurry with adhesive and foaming agent Mix uniformly, press and shape the obtained mixture, and finally sinter to obtain a porous electrolyte membrane; the doping phase M is GeCl 2 ; The adhesive is epoxy resin, and the addition of the adhesive is 2.5wt% of the total mass of the mixture; the foaming agent is ammonium nitrite, and the addition of the foaming agent is 2.5wt% of the total mass of the mixture; sintering adopts vacuum Sintering, the sintering atmosphere is nitrogen, the sintering pressure is 1.5kPa, the sintering temperature is 580°C, and the sintering time is 3h;

[0038] Among the raw materials of the mixed slurry, the molar ratio of lithium chloride, yttrium chloride and doped phase M is 3:0.98:0.02; the total mass of lithium chloride, yttrium chloride and doped phase M...

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PUM

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Abstract

The invention relates to the field of lithium batteries, and discloses a semi-solid lithium battery electrolyte and a preparation method thereof. The preparation method comprises the following steps:(1) uniformly mixing slurry of a mixture of lithium chloride, yttrium chloride, a doping phase M and absolute ethyl alcohol with an adhesive and a foaming agent, and carrying out compression molding and sintering to obtain a porous electrolyte membrane; and (2) dipping the porous electrolyte membrane in an ethylene glycol solution of sulfamic acid, then adding allyl polyethylene glycol monoether,adding urea, carrying out a heating reaction under the protection of inert gas, then adding acrylic acid, carrying out a cooling reaction, then continuously adding calcium chloride, carrying out a standing reaction, finally taking the electrolyte membrane out of the oven, performing drying, and carrying out subsequent processing to obtain the semi-solid lithium battery electrolyte. According to the semi-solid lithium battery electrolyte prepared by the invention, a rigid porous structure Li3MxY1xCl6 is used as a framework material, and internal pores are filled with flexible sulfonic acid-based end-capped polymer gel, so that the lithium ion conductivity of an electrode is effectively improved, the ionic conductivity is high, and the application prospect is good.

Description

technical field [0001] The invention relates to the field of lithium batteries, and discloses a semi-solid lithium battery electrolyte and a preparation method. Background technique [0002] Lithium battery is a kind of battery that uses lithium metal or lithium alloy as negative electrode material and uses non-aqueous electrolyte solution. With the development of science and technology, lithium batteries have become the mainstream due to their excellent performance. Traditional lithium-ion rechargeable batteries using organic electrolytes may cause the electrolyte to heat up when abnormal conditions such as overcharging and internal short circuit occur, and there is a risk of spontaneous combustion or explosion. All-solid-state batteries do not use liquid electrolytes, but solid electrolytes, which are not easy to burn, and their safety can be greatly improved, so they have attracted much attention. [0003] Large-capacity new-generation batteries using solid-state electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/008Y02E60/10
Inventor 陈庆廖健淞何方陈涛曾军堂
Owner 上海彤程电子材料有限公司