Positive electrode lithium supplement agent and preparation method and application thereof

A technology for supplementing lithium and positive electrodes is applied in the field of positive lithium supplements and their preparation, and can solve the problems of increasing cell impedance, catalytic electrolyte gas production, and less positive lithium supplements.

Pending Publication Date: 2022-05-24
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are fewer choices of positive electrode lithium supplements, usually Li 2 NiO 2 , Li 6 COO 4 and other lithium-rich materials, and the residue left on the positive side of these positive electrode lithium replenishing agents after delithiation will increase the impedance of the battery cell, catalyze the gas production of the electrolyte, etc.

Method used

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  • Positive electrode lithium supplement agent and preparation method and application thereof
  • Positive electrode lithium supplement agent and preparation method and application thereof
  • Positive electrode lithium supplement agent and preparation method and application thereof

Examples

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preparation example Construction

[0070] Correspondingly, an embodiment of the present application also provides a preparation method of the above-mentioned positive electrode lithium supplement, including:

[0071] S01, performing lattice reconstruction on the oxide-type positive electrode active material to obtain a catalyst; wherein, the intensity ratio of the (104) crystal plane diffraction peak and the (003) crystal plane diffraction peak of the catalyst is less than or equal to 2;

[0072] S02, physically fuse the catalyst with a lithium-rich material to obtain a positive electrode lithium supplement; wherein the catalyst is used to catalyze the decomposition of the lithium-rich material to release active lithium, and the lithium-rich material includes lithium oxide, peroxide At least one of lithium, lithium fluoride, lithium carbonate, lithium oxalate, and lithium acetate.

[0073] This preparation method can produce as figure 1 The positive lithium supplement in which the catalyst and the lithium-rich...

Embodiment 1

[0099] A preparation of a positive electrode lithium supplement, comprising:

[0100] Use lithium cobalt oxide LiCoO 2 As a catalyst precursor, high-energy ball milling was carried out for 48 hours at a ball-to-material ratio of 20:1 and a rotational speed of 350 r / min to achieve lattice reconstruction to obtain a catalyst; then the catalyst and lithium-rich material Li 2 O is mixed at a mass ratio of 4:1, and ordinary ball milling is carried out at a rotational speed of 200 r / min for 6 hours. After that, the mixed powder after ball milling is placed in a tube furnace and heated to 400 ° C, and the dry air is continuously fed at a flow rate of 60 sccm. 2 hours to make part of Li 2 O reacts to form a lithium carbonate protective layer, and after cooling to room temperature, the obtained powder is ground and sieved to obtain a positive electrode lithium supplement.

[0101] A preparation of a soft pack battery, comprising:

[0102] 1) Preparation of battery cathode sheet: tak...

Embodiment 2

[0113] A preparation of a positive electrode lithium supplement, comprising:

[0114] Commercially available lithium cobalt oxide powder with a particle size in the range of 2-50 μm is selected as the catalyst precursor, and boron oxide powder and lithium aluminum titanium phosphate (LATP) powder are added thereto to obtain a mixed powder; wherein, in the mixed powder, boron oxide powder The mass ratio of LATP powder is 1%; the mixed powder is put into the ball mill tank, and the ball-to-material ratio is 15:1 and the rotation speed is 380r / min for 12h of high-energy ball milling, and then the mixed powder is transferred to the tube type In the furnace, sintered at 700°C for 8 hours in an air atmosphere, and then ground and sieved to obtain a lattice-reconstructed lithium cobalt oxide, that is, a catalyst, whose particle size is 10nm-2μm, and its (003) crystal plane diffraction The intensity ratio of the peak to the (104) crystal plane diffraction peak is 1.55;

[0115] Combi...

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Abstract

The embodiment of the invention provides a positive electrode lithium supplementing agent. The positive electrode lithium supplementing agent comprises a catalyst and a lithium-rich material, the catalyst is an oxide type positive electrode active material, the intensity ratio of a crystal face diffraction peak (003) to a crystal face diffraction peak (104) of the catalyst is smaller than or equal to 2, and the catalyst is used for catalyzing decomposition of the lithium-rich material to release active lithium. The lithium-rich material comprises at least one of lithium oxide, lithium peroxide, lithium fluoride, lithium carbonate, lithium oxalate and lithium acetate. In the presence of the catalyst, the positive electrode lithium supplementing agent can release active lithium ions at a relatively low voltage, and residues after lithium removal do not increase the risk of gas production of a battery electrolyte and do not increase the impedance of a battery cell, so that a relatively good lithium supplementing effect can be achieved. The embodiment of the invention also provides a preparation method of the positive lithium supplement agent, a battery positive plate, an electrochemical battery and a terminal.

Description

technical field [0001] The embodiments of the present application relate to the technical field of batteries, and in particular, to a positive lithium supplementing agent for a positive electrode of a battery, and a preparation method and application thereof. Background technique [0002] With the development of economy and technology, industries such as portable electronic devices (mobile phones, tablet computers, notebook computers, etc.), drones, electric vehicles and other industries urgently need energy storage devices with higher energy density and longer cycle life. In order to make the lithium-ion battery as an energy storage device meet the above requirements, the industry usually takes measures to add a lithium-replenishing agent that can provide active lithium to the lithium-ion battery system in advance to make up for the active lithium in the battery manufacturing and cycle process. irreversible loss. [0003] At present, lithium supplementation methods in batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M4/38H01M4/66H01M10/0525
CPCH01M10/4235H01M4/382H01M4/667H01M10/0525H01M4/38H01M10/42H01M4/66H01M4/36Y02E60/10
Inventor 李硕宇夏圣安雷雨沙玉静
Owner HUAWEI TECH CO LTD
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