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Organic-inorganic all-solid-state composite electrolyte as well as preparation and application methods thereof

An inorganic composite, all-solid-state technology, used in solid electrolytes, electrolytes, non-aqueous electrolytes, etc., can solve the problems of not obtaining a three-dimensional connected inorganic network film, increasing the impedance at the electrolyte impedance interface, and poor cycle performance of all-solid-state batteries. Good stability to metal lithium, beneficial to cycling, excellent mechanical properties

Pending Publication Date: 2017-05-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the obtained electrolyte is a gel-type electrolyte, which has potential safety hazards
And the inorganic network obtained after calcination in its work is a powder, and a complete three-dimensional connected inorganic network film is not obtained, which affects the order of the particle arrangement and increases the impedance of the electrolyte and the impedance at the interface.
[0006] The interface problems of all-solid-state batteries, especially the interface problems between the positive electrode and the electrolyte (such as small solid-solid contact area and serious interface stress problems), lead to poor cycle performance of all-solid-state batteries and low power density of batteries. a certain degree of restriction

Method used

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Examples

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preparation example Construction

[0025] The invention provides a preparation method of a three-dimensional network inorganic-organic composite electrolyte, which is mainly used in lithium-ion batteries, and comprises the following steps:

[0026] Step S1 prepares an inorganic fast lithium ion conductor film with a three-dimensional connection network structure by using a template method or a spinning method.

[0027] When using the template method to prepare inorganic fast lithium ion conductor films, a certain amount of organic matter (such as linear, spherical organic matter, etc.) is regularly arranged into a template, mixed with the precursor sol of the inorganic fast ion conductor, and the inorganic lithium ion conductor sol is vacuum infiltrated Into the micropores in the template, this step is repeated many times and kept for a certain period of time each time, so as to ensure the final three-dimensional network inorganic film with a complete structure. The mixed colloidal substance is transferred to 5...

Embodiment 1

[0038] (1) Add 15ml of deionized water, 1.358g of lithium nitrate, 2.463g of aluminum nitrate, 5.6g of titanium isopropoxide, 4ml of nitric acid, 4.533g of ammonium dihydrogen phosphate, and 8.6g of citric acid into a 25ml beaker, and stir at room temperature for 5 Hour, obtain the precursor sol solution of Li1.5Al0.5Ti1.5(PO4)3;

[0039] (2) Take 0.3ml of polystyrene sphere suspension with an average particle size of 350nm, centrifuge at 15000r / min for 1h, transfer to a freeze dryer, freeze for 24h and then vacuum dry. Transfer the dried PS film to a blast drying oven at 150°C and heat slowly for 3 hours, then slowly inject the sol solution in step (1) into the heat-treated PS film through vacuum infiltration or under reduced pressure to obtain a mixed colloidal film . This process is repeated 5 times to ensure that the sol solution can be injected evenly and completely;

[0040] (3) The above-mentioned mixed colloidal film is heated to 60° C. to polymerize to obtain a visc...

Embodiment 2

[0048] (1) Dissolve 0.086g of lithium acetate, 0.1125g of aluminum nitrate, 0.369g of titanium isopropoxide, and 0.345g of ammonium dihydrogen phosphate in a mixed solution of 25ml of deionized water, 5ml of acetic acid, and 15ml of isopropanol, and stir for 5 hours to obtain Mix the sol solution evenly, and take 6ml for later use. Polyvinylpyrrolidone (PVP) was dissolved in 4 ml of acetic acid, and stirred to obtain a uniform mixed solution, wherein the mass percentage of PVP in acetic acid was 10%. Mix the two solutions thoroughly to obtain 10ml of spinning solution;

[0049] (2) Transfer the spinning precursor solution to a 10ml syringe and install it in the electrospinning device. During the spinning process, aluminum foil is used as the receiver, the spinning voltage is controlled at 14KV, and the distance between the receiver and the needle of the syringe is 18cm . After the spinning is completed, a uniform milky white spinning film is obtained;

[0050] (3) The above...

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Abstract

The invention relates to organic-inorganic all-solid-state composite electrolyte as well as preparation and application methods thereof, belonging to the field of lithium ion batteries. According to the organic-inorganic all-solid-state composite electrolyte, a highly-ordered three-dimensional connection network skeleton is formed by an inorganic fast lithium ion conductor, and a three-dimensional connection network is filled with a polymer and lithium salt. The organic-inorganic all-solid-state composite electrolyte which is flexible and has a controllable three-dimensional connection network structure is prepared. The electrolyte is high in lithium ion conductivity, wide in electrochemical window, good in mechanical property and stable to lithium metal. A lithium ion secondary battery assembled by a composite electrolyte membrane prepared by the method is high in capacity, stable in cycle performance, low in interface impedance and good in interface stability.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to an all-solid electrolyte and its preparation method and application. Among them, the all-solid-state electrolyte uses an inorganic fast lithium-ion conductor thin film as a three-dimensional ordered network skeleton, and polymer polymers and lithium salts are filled in the three-dimensional network to form a flexible organic-inorganic all-solid composite solid electrolyte. The all-solid-state lithium secondary battery constructed with the all-solid-state electrolyte has excellent electrochemical performance. Background technique [0002] Liquid electrolytes and gel electrolytes have high room temperature ionic conductivity, so existing commercial lithium-ion batteries have low battery internal resistance and good cycle stability near room temperature. However, the liquid-solid transformation of organic liquid electrolytes occurs at low temperatures, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065H01M2300/0091Y02E60/10
Inventor 范丽珍李丹
Owner UNIV OF SCI & TECH BEIJING
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