High-voltage-resistant all-solid-state lithium battery interface layer and in-situ preparation method and application thereof

An in-situ preparation and interfacial layer technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, solid electrolytes, etc., can solve problems such as the formation of space charge layers, poor contact, and increased contact resistance, so as to increase the oxidation decomposition potential and reduce Effects of interface resistance and specific energy improvement

Active Publication Date: 2020-11-13
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an in-situ preparation method of a high-voltage resistant electrolyte interface layer, the purpose of which is electrochemical polymerization, which initiates and completes polymerization during charging without secondary assembly , so as to solve the technical problems of poor contact and then form a space charge layer and increase contact resistance

Method used

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  • High-voltage-resistant all-solid-state lithium battery interface layer and in-situ preparation method and application thereof
  • High-voltage-resistant all-solid-state lithium battery interface layer and in-situ preparation method and application thereof
  • High-voltage-resistant all-solid-state lithium battery interface layer and in-situ preparation method and application thereof

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Embodiment 1

[0034] (1) Precursor preparation: 100g trifluoroethyl methacrylate monomer and 100g lithium trifluoromethanesulfonylimide LiTFSI were mixed in an inert gas-protected glove box, and 3g initiator azobisisobutyronitrile ( AIBN), stirring for 4h until the lithium salt is fully dissolved, the water content in the glove box is less than 0.1ppm, and the oxygen content is less than 0.1ppm;

[0035] (2) Assemble the battery, smear the precursor on the opposite side between the positive electrode and the ether-based electrolyte matrix, and assemble the prepared positive electrode, negative electrode and ether-based electrolyte matrix into a battery in the glove box;

[0036] (3) Electrochemically initiate polymerization, transfer the assembled battery to an oven, set the oven temperature to 60 degrees Celsius, keep warm for 2 hours, charge the battery, set the current rate to 0.1C, and start from the initial voltage of 2.8V. Flow charging, charge to 4.3V stop.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a high-voltage-resistant electrolyte interface layer and an in-situ preparation method and application thereof. Thepreparation method comprises the following steps: (1) uniformly mixing a fluorine-containing acrylate monomer and a lithium salt to prepare a precursor; (2) assembling the precursor, a positive electrode, a negative electrode and an electrolyte matrix into a battery, wherein the precursor is arranged between the electrolyte matrix and a positive electrode material; and (3) charging the battery topolymerize the acrylate monomer, and curing the precursor to form a polymer electrolyte layer, thereby obtaining the high-voltage-resistant electrolyte interface layer. An electrochemical polymerization method is used, polymerization is completed in the charging process, secondary assembly is not needed, and therefore the technical problems that due to poor contact, a space charge layer is formed, and contact resistance is increased are solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage resistant electrolyte interface layer and its in-situ preparation method and application. Background technique [0002] The problems of positive electrode-electrolyte interface contact and stability in all-solid-state batteries, including poor solid-solid interface contact forming a space charge layer to increase internal resistance, interface side reactions, and positive electrode material structure collapse and particle breakage under high voltage, have been Limit the full range of industrialization of lithium-ion batteries. At present, it is generally believed that adding fluorine-containing alkali metal salts, solvents / co-solvents, functional additives, etc. to organic carbonate-based electrolyte systems can improve the high-voltage resistance of batteries. High-voltage solid electrolytes, however, are limited by the contact resistance formed dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 方淳李琪韩建涛
Owner HUAZHONG UNIV OF SCI & TECH
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