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Preparation method and application of lithium cobalt oxide with pre-lithiated core-shell structure

A technology of structural lithium cobalt oxide and pre-lithiation, which is applied in the field of nanomaterials to reduce the effective volume, improve the first efficiency, and improve the reversible gram capacity.

Inactive Publication Date: 2022-02-25
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is a feasible method to use materials with high gram capacity and low irreversible capacity to supplement the reversible capacity of lithium-ion positive and negative electrode materials; there are no related products on the market yet

Method used

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  • Preparation method and application of lithium cobalt oxide with pre-lithiated core-shell structure
  • Preparation method and application of lithium cobalt oxide with pre-lithiated core-shell structure
  • Preparation method and application of lithium cobalt oxide with pre-lithiated core-shell structure

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preparation example Construction

[0059] A preparation method of pre-lithiated core-shell structure lithium cobaltate, comprising the steps of:

[0060] (1) Preparation of carbon nanotube-supported doped lithium ferrite Li 5 Fe n x (1-n) o 4 :

[0061] Dissolving iron salts and other metal salts in aqueous solution, adding surfactant molecules, lithium compounds and carbon nanotubes, adjusting the pH value and temperature of the solution, stirring, and reacting to obtain a precursor by filtering and washing, the precursor The body is calcined in air, and the calcined product is crushed, sieved, washed, and dried to obtain carbon nanotube-supported doped lithium ferrite Li 5 Fe n x (1-n) o 4 ;

[0062] (2) Preparation of surface self-assembled film modified carbon nanotubes loaded with doped lithium ferrite Li 5 Fe n x (1-n) o 4 :

[0063] The obtained carbon nanotubes were loaded with doped lithium ferrite Li 5 Fe n x (1-n) o 4 placed in an ionic liquid solution containing a surfactant, stirre...

Embodiment 1

[0076] A preparation method of pre-lithiated core-shell structure lithium cobaltate, comprising the steps of:

[0077] Step (1): Add 300 grams of polymer surfactant molecule polyvinyl alcohol (PVAL) in 5L of 5mol / L lithium nitrate solution, stir until the solution is clear, adjust the pH of the solution to 9.5 with lithium hydroxide, add 200 grams of 80nm carbon nanotubes with a length of about 3 microns, stirred at a high speed of 1000rpm / min until the solution is uniformly mixed, added 1L of 5mol / L ferric nitrate solution during the stirring process, kept the solution reaction temperature at 90°C, and the reaction time was 10 hours. The material was filtered, washed with hot deionized water until the washing liquid was clear, dried in the air at 100°C, and the prepared product was calcined at 450°C for 5 hours in an air atmosphere, cooled naturally, and crushed through a 150-mesh sieve to prepare the product carbon Nanotube-supported doped lithium ferrite Li 5 FeO 4 ;

[...

Embodiment 2

[0090] The only difference from Example 1 is: step (1): 200 grams of polymer surfactant molecule polyethylene glycol (PEG) is added in 5 L of 5 mol / L lithium nitrate solution.

[0091] Embodiment 1 and embodiment 2 film battery capacity retention curves are as Figure 9 Shown; Embodiment 1 and Embodiment 2 The capacity retention rate is the same after 250 cycles.

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Abstract

The invention provides a preparation method and application of lithium cobalt oxide with a pre-lithiated core-shell structure. The method comprises the following steps: (1) preparing carbon nanotube loaded doped lithium ferrite Li5FenX(1-n)O4; (2) preparing surface self-assembled film modified carbon nanotube loaded doped lithium ferrite Li5FenX(1-n)O4; (3) preparing a lithium cobalt oxide precursor crystal seed cobaltate MCo2O4; (4) preparing a lithium cobalt oxide precursor; (5) preparing lithium cobalt oxide; (6) preparing surface coated lithium cobalt oxide; and (7) preparing surface nitride coated lithium cobalt oxide. According to the lithium cobalt oxide with the pre-lithiated core-shell structure, the cobaltate is adopted as a seed crystal, and the lithium cobalt oxide precursor is prepared and generated in an aqueous solution in a carbon nanotube loaded pre-lithiated positive electrode material doped lithium ferrite self-assembly mode; and a titanium-containing oxide coating layer is prepared, and nitridation reaction is carried out to generate coated lithium cobalt oxide containing titanium nitride and oxide.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a preparation method and application of pre-lithiated core-shell lithium cobalt oxide. Background technique [0002] The positive and negative electrode materials of lithium-ion secondary batteries will have irreversible capacity for the first charge and discharge. In order to increase the effective battery material capacity, supplementing the active and freely migrating lithium ion content of the positive and negative electrode materials is a good way to increase battery capacity. It is a feasible method to use materials with high gram capacity and low irreversible capacity to supplement the reversible capacity of lithium-ion positive and negative electrode materials; there are no related products on the market yet. Contents of the invention [0003] In view of this, the present invention aims to overcome the defects in the prior art, and proposes a preparation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01F7/30C01F7/021C01F7/02C01B21/076H01M4/525H01M4/62H01M10/0525
CPCC01G51/42C01B21/076C01F7/30C01F7/021C01F7/02H01M4/525H01M4/625H01M4/628H01M10/0525C01P2004/03C01P2004/61C01P2004/80Y02E60/10
Inventor 徐士民吕菲李磊徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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