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Preparation method and application of lithium/lithiated metal oxide frame composite negative electrode

A composite structure and oxide technology, applied in the direction of negative electrodes, structural parts, active material electrodes, etc., can solve the problems of insufficient lithium dendrite inhibition and insignificant effects, achieve uniform lithium flux, low price, and avoid safety The effect of the accident

Active Publication Date: 2022-04-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the artificial SEI film often only works on the lithium deposition on the electrode surface, and the effect is not obvious when the lithium in the bulk phase participates in the battery reaction.
However, the 3D current collector is often a single conductive framework, which has insufficient inhibitory effect on lithium dendrites.

Method used

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  • Preparation method and application of lithium/lithiated metal oxide frame composite negative electrode
  • Preparation method and application of lithium/lithiated metal oxide frame composite negative electrode
  • Preparation method and application of lithium/lithiated metal oxide frame composite negative electrode

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Embodiment 1

[0025] The present embodiment provides a method for preparing a fast ion transport type lithium / lithene metal oxide frame composite structure negative electrode for lithium secondary battery, the specific steps of the method are as follows:

[0026] (1) Will MnO 2 The powder, conductive carbon and PVDF are mixed according to 7:2:1, magnetically stirred for 12h, so that it is mixed evenly, and the mixed slurry is evenly coated on the surface of the copper foil with a scraper, and then transferred to a vacuum oven, 60 ° C, 12h, vacuum drying pole pieces.

[0027] (2) Take the lithium sheet as the negative electrode and the pole piece prepared in step (1) as the counter electrode at 0.5 mA g -1 The current density is constant current discharge, and the cutoff voltage is 1.5V, and Li is obtained y MnO 2 Electrode frame, 0.5≤y≤0.75.

[0028] (3) The Li obtained in step (2). y MnO 2 Electrode frame with molten lithium (Li y MnO 2 : Li = 1: 2) at 300 °C composite, the molten lithium is...

Embodiment 2

[0032] The present embodiment provides a method for preparing a fast ion transport type lithium / lithene metal oxide frame composite structure negative electrode for lithium secondary battery, the specific steps of the method are as follows:

[0033] (1) Move MoO 2 The powder, conductive carbon and PVDF are mixed according to 7:2:1, magnetically stirred for 24h, so that it is mixed evenly, and the mixed slurry is evenly coated on the surface of the copper foil with a scraper, and then transferred to a vacuum oven, 80 °C, 12h, vacuum drying pole pieces.

[0034] (2) Take the lithium sheet as the negative electrode and the pole piece prepared in step (1) as the counter electrode at 0.5 mA g -1 The current density is constant current discharge, and the cutoff voltage is 1.5V, and Li is obtained y TiO 2 Electrode frame, 0.5≤y≤0.75.

[0035] (3) The Li obtained in step (2). y TiO 2 Electrode frame with molten lithium (Li y TiO 2 : Li = 1: 2) at 300 °C composite, the molten lithium is ...

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Abstract

The invention discloses a preparation method and application of a negative electrode with a lithium / lithiated metal oxide frame composite structure. The method is as follows: 1. x , conductive carbon and PVDF are mixed and evenly coated on the current collector, and after vacuum drying, MO x Pole piece; 2. Using metal lithium sheet as negative electrode, MO x The pole piece is used as the counter electrode, the battery is assembled, the constant current discharge is performed, the cut-off voltage is controlled, and the Li y MO x Electrode frame; three, the Li y MO x The electrode frame is mixed with molten lithium to obtain a composite structure negative electrode, and a solid-state electrolyte is used to assemble an all-solid-state battery. In the present invention, the embedded transition metal oxide MO x As a carrier, Li with fast ion transport properties is formed after lithium intercalation y MO x Electrode frame, and then uniformly deposit metallic lithium inside the frame, thereby inhibiting the growth of lithium dendrites and avoiding safety accidents.

Description

Technical field [0001] The present invention belongs to the field of energy storage technology, relates to a fast ion transport type lithium / lithified metal oxide frame composite structure anode preparation method for lithium secondary all-solid-state battery and its application. Background [0002] Lithium metal due to its lowest electrode potential (-3.04 V relative to standard hydrogen electrodes), high mass specific capacity (3860 mAh / g) and highest area specific capacity (2060 mAh / cm). 2 ), with great prospects for development. However, due to the uneven deposition of lithium ions, lithium dendrites will also be produced in solid-state batteries, and the continuous growth of lithium dendrites will pierce the solid electrolyte, causing the battery to short circuit, and when it is serious, it will cause safety problems such as fire and even explosion. [0003] The main measures to inhibit the growth of lithium dendrites are solid electrolyteinterface (SEI film) and 3D fluid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/62H01M4/38H01M4/134H01M10/0525
CPCH01M4/1395H01M4/134H01M4/382H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 王家钧刘青松姜再兴左朋建尹鸽平
Owner HARBIN INST OF TECH
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