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A lithium-rich oxide material and its preparation method and use

An oxide, lithium-rich technology, applied in the field of materials, can solve the problems of inability to meet high energy density lithium-ion battery cathode materials, and achieve the effects of high charge and discharge capacity, low cost, and simple preparation

Active Publication Date: 2020-06-02
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the specific capacity of the negative electrode material has reached more than 300mAh / g, while the specific capacity of the positive electrode material has been around 150mAh / g, which is far from meeting the demand for high energy density lithium-ion battery cathode materials.

Method used

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  • A lithium-rich oxide material and its preparation method and use
  • A lithium-rich oxide material and its preparation method and use
  • A lithium-rich oxide material and its preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Embodiment 1 of the present invention provides a lithium-rich oxide material whose general chemical formula is xLi 2+α Ni 1-a N a o 2+δ1 -(1-x)Li 2+β mn 1-b m b o 3+δ2 , or the general chemical formula is Li 2+γ Ni x(1-a) N xa mn (1-x)(1-b) m (1-x)b o δ , where, γ=xα+β-xβ, δ=3-x+xδ 1 +δ 2 -xδ 2 .

[0059] Among them, N and M are respectively Ni 2+ , Ni 3+ , Cr 3+ ,Cr 6+ ,Co 2+ ,Co 3+ , Fe 2+ , Fe 3+ , Mn 2+ , Mn 3+ , Mn 4+ , Mo 4+ , Ti 3 + , Ti 4+ , Mg 2+ , Al 3+ , Zn 2+ , V 3+ , Zr 4+ and Ru 4+ One of; N and M can be the same element at the same time or not at the same time; among them, x, a, b, α, β, γ, δ 1 ,δ 2 Sequentially satisfy 01 ≤0.1, -0.1≤δ 2 ≤0.1.

[0060] figure 1 For the XRD patterns of multiple lithium-rich oxide materials with different element mole percentages provided in Example 1 of the present invention, in figure 1 Provided in the X-ray diffraction (X-raydiffraction, XRD) collection of a plurality of lithium-r...

Embodiment 2

[0064] Example 2 of the present invention provides a preparation method of a lithium-rich oxide material, specifically a solid phase method, figure 2 A flowchart of a preparation method for a lithium-rich oxide material provided in Example 2 of the present invention, consisting of figure 2 Shown, preparation method comprises:

[0065] Step 201, weighing the stoichiometric 102wt%-108wt% Li in a glove box filled with an inert atmosphere 2 O and the desired stoichiometry of NiO, MnO 2 and N, M oxides are mixed in proportion to form a precursor, and put into a mortar; the N and M are respectively Ni 2+ , Ni 3+ , Cr 3+ ,Cr 6+ ,Co 2+ ,Co 3+ , Fe 2+ , Fe 3+ , Mn 2+ , Mn 3+ , Mn 4+ , Mo 4+ , Ti 3+ , Ti 4+ , Mg 2+ , Al 3+ , Zn 2+ , V 3 + , Zr 4+ and Ru 4+ one of

[0066] Step 202, uniformly mixing the precursors under an inert atmosphere to obtain precursor powders, and pressing them into thin sheets;

[0067] Step 203, put the precursor into the quartz tube t...

Embodiment 3

[0073] Example 3 of the present invention provides a method for preparing a lithium-rich oxide material with a coating layer on the surface, specifically a solid phase method, image 3 A flow chart of a preparation method of a lithium-rich oxide material with a coating layer on the surface provided in Example 3 of the present invention, consisting of image 3 Shown, preparation method comprises:

[0074] Step 301, weighing 102wt% to 108wt% of lithium salts, salts or oxides of transition metals Ni and Mn, salts or oxides of doped metals N and M, and carbon sources according to the molar ratio, and put them into a ball mill jar together; Said N and M are respectively Ni 2+ , Ni 3+ , Cr 3+ ,Cr 6+ ,Co 2+ ,Co 3+ , Fe 2+ , Fe 3+ , Mn 2+ , Mn 3+ , Mn 4+ , Mo 4+ , Ti 3+ , Ti 4+ , Mg 2+ , Al 3+ , Zn 2+ , V 3+ , Zr 4+ and Ru 4+ one of

[0075] Step 302, adding an organic solvent into the ball mill tank, and then starting ball milling;

[0076] Step 303, after ball ...

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Abstract

The invention discloses a lithium-rich oxide material and a preparation method and application thereof. The general chemical formula of the lithium-rich oxide material can be seen in the description or is Li2+gammaNix(1-a)NxaMn(1-x)(1-b)M(1-x)bOdelta. The lithium-rich oxide material is easy to prepare, rich in raw material resource and low in cost, is a green material free of pollution, can be used in a lithium ion storage battery as a positive electrode active material of the lithium ion storage battery; the lithium ion storage battery prepared in this way has high charge and discharge capacity and can be used as lithium batteries for various purposes such as electronic devices, electric tools, electric vehicles and large-scale energy storage devices with solar power generation and wind power generation functions. The lithium-rich oxide material can also be used as a positive electrode catalyst material in a metal lithium gas battery.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a lithium-rich oxide material and its preparation method and application. Background technique [0002] At present, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebooks, and cameras, and the technology is becoming more and more mature. But people's thirst for energy is eager to apply lithium-ion batteries to electric vehicles and energy storage. Currently commercial lithium-ion batteries generally use LiCoO 2 Cathode, LiMn 2 o 4 Cathode or LiFePO 4 Positive electrode and graphitized carbon negative electrode material system. At present, the specific capacity of the negative electrode material has reached more than 300mAh / g, while the specific capacity of the positive electrode material has been around 150mAh / g, which is far from meeting the demand for high energy density lithium-ion battery cathode materials. Therefore, the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/90H01M4/88H01M10/0525
CPCH01M4/364H01M4/48H01M4/8825H01M4/9016H01M10/0525Y02E60/10Y02E60/50
Inventor 吕迎春张杰男李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI