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Pre-lithiated lithium ion positive electrode material and preparation method and application thereof

A cathode material and lithium ion technology, applied in the field of pre-lithiation-treated lithium ion cathode material and its preparation, can solve the problems of reducing battery compatibility and failing to improve safety performance and the like

Active Publication Date: 2020-10-20
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, lithium is added to the negative electrode of some lithium-ion batteries to increase the initial discharge capacity, but adding lithium to the negative electrode of the battery will reduce battery compatibility, and this method of adding lithium cannot improve safety performance

Method used

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  • Pre-lithiated lithium ion positive electrode material and preparation method and application thereof
  • Pre-lithiated lithium ion positive electrode material and preparation method and application thereof
  • Pre-lithiated lithium ion positive electrode material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0054] The lithium ion cathode material of the pre-lithiation treatment of the present embodiment, its chemical formula is (Li 2 O / [Co 2.95 (TiAl) 0.05 ] 1 / 3 ) 0.01 ·(Li 1.01 co 0.96 Mg 0.008 Al 0.024 Zr 0.008 o 2 ) 0.99 .

[0055] A kind of pre-lithiation solution, is mixed by naphthalene, lithium carbonate and Al, Ti, then adds in the sulfuric acid solution and stirs, obtains the pre-lithiation solution (containing naphthalene-lithium-Me solution); Wherein naphthalene and lithium carbonate are molar ratio Mix for 2:1.

[0056] A kind of preparation method of the lithium ion cathode material of pre-lithiation treatment, comprises the following steps:

[0057] (1) 200L of cobalt sulfate solution with a configuration concentration of 0.4mol / L, 6.25L of magnesium sulfate solution with a configuration concentration of 0.1mol / L, 9.0L of aluminum sulfate with a configuration concentration of 0.2mol / L, and sulfuric acid with a configuration concentration of 0.1mol 6.25 ...

Embodiment 2

[0062] The lithium ion cathode material of the pre-lithiation treatment of the present embodiment, its chemical formula is (Li 2 O / [Co 2.94 (TiAl) 0.06 ] 1 / 3 ) 0.02 ·(Li 1.01 co 0.96 Mg 0.008 Al 0.024 Y 0.008 o 2 ) 0.98 .

[0063] The preparation method is roughly the same as in Example 1. The main difference is that in Example 2, the precursor doping elements are magnesium, aluminum, and yttrium. The tempering temperature is 450 ° C. After the pre-lithiation treatment, the pre-treatment layer N2 , the total mass of the N2 pretreatment layer accounts for 2.0% of the total mass of the material.

Embodiment 3

[0065] The lithium ion cathode material of the pre-lithiation treatment of the present embodiment, its chemical formula is (Li 2 O / [Co 2.92 (TiAl) 0.08 ] 1 / 3 ) 0.015 ·(Li 1.01 co 0.96 Mg 0.008 Al 0.02 Y 0.008 Ti 0.004 o 2 ) 0.985 .

[0066] The preparation method is roughly the same as in Example 1. The main difference is that in Example 3, the precursor doping elements are four elements: magnesium, aluminum, yttrium, and titanium, and the tempering time is 1h. After the pre-lithiation treatment, the pre-treatment layer N3, the total mass of the N3 pretreatment layer accounts for 1.5% of the total mass of the material.

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Abstract

The invention discloses a pre-lithiated lithium ion positive electrode material and a preparation method and application thereof. The chemical formula of the lithium ion positive electrode material isLi2O / [A(3-x)Mex]1 / 3-LiAO2, A comprises M, and M is at least one of Ni, Co and Mn; Me is at least one of Ni, Mn, Al, Mg, Ti, Zr, Y, Mo, W, Na, Ce, Cr, Zn or Fe; and 0 < x < 0.1. Multiple elements areco-doped and have a synergistic effect, so that irreversible phase change under high voltage is inhibited, and the structural stability of the base material is improved; the spinel phase A(3-x)MexO4 structure contains doping elements, the interfacial activity of the material is improved through combined action, and more electrochemical active sites are introduced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a prelithiated lithium ion positive electrode material and a preparation method and application thereof. Background technique [0002] Due to its outstanding advantages such as high energy density, low self-discharge, and no memory effect, lithium-ion batteries have become the main solution for mobile energy, and have been widely used in many fields such as mobile phones, tablets, electric vehicles, drones, and energy storage. . With the promotion of thinner, lighter and more durable lithium-ion batteries, it not only requires lithium-ion batteries to have higher energy density, but also puts forward new requirements for their safety performance. For example, with the acceleration of mobile phones, electric vehicles and other products and upgrading, the configuration is getting higher and higher, which requires lithium-ion batteries to have higher energy density ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C01D15/02C01G51/00
CPCH01M4/366H01M4/525H01M4/485H01M4/505H01M4/628H01M10/0525C01D15/02C01G51/006H01M2004/021H01M2004/028C01P2002/85C01P2004/03C01P2002/72C01P2004/80Y02E60/10C01G51/42C01P2002/52C01P2006/40H01M4/131H01M4/1391H01M10/052C01G53/50H01M4/0452
Inventor 李斌阮丁山毛林林唐盛贺吴星宇李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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