A lithium-rich cathode material with molybdenum/fluorine co-doping and spinel in-situ coating and its preparation method

A lithium-rich positive electrode material and lithium-rich material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of poor structural stability and low lithium ion diffusion rate, achieve good consistency, and the preparation process is simple and easy to control , the effect of promoting diffusion

Active Publication Date: 2020-09-01
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a molybdenum / fluorine co-doped and spinel in-situ coated lithium-rich positive electrode material to solve the problem of poor internal and surface / interface structure stability and low lithium ion diffusion rate of lithium-rich positive electrode materials in the prior art And other issues

Method used

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  • A lithium-rich cathode material with molybdenum/fluorine co-doping and spinel in-situ coating and its preparation method
  • A lithium-rich cathode material with molybdenum/fluorine co-doping and spinel in-situ coating and its preparation method
  • A lithium-rich cathode material with molybdenum/fluorine co-doping and spinel in-situ coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Synergistic doping of Mo and F ions and in-situ coating modification of spinel applied to lithium-rich manganese-based ternary cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , prepared by the following steps:

[0047] (1) Prepare agar solution with a concentration of 30mg / mL, add lithium, nickel, cobalt and manganese nitrate, add ammonium heptamolybdate and lithium fluoride, wherein Mo 6+ and F - The moles are respectively 5.0% and 4.0% of the total moles of heavy metal ions. Add citric acid as a complexing agent to make a mixed solution, stir at 80 °C for 1 h, wait for it to cool to form a gel, prepare the precursor powder by freeze-drying, and sinter the precursor powder at 950 °C for 10 h to obtain Mo and F Lithium-rich cathode material modified by ion synergistic doping, the chemical formula is Li 1.168 mn 0.54 Ni 0.09 co 0.13 Mo 0.04 o 1.968 f 0.032 , as a nucleosome;

[0048] (2) preparation concentration is the tartaric acid solution of 5mg / mL;...

Embodiment 2

[0056] Example 2: Mo and F ion synergistic doping and spinel in-situ coating modification applied to lithium-rich manganese-based cathode material Li 1.2 mn 0.6 Ni 0.2 o 2

[0057] (1) prepare the agar solution that concentration is 20mg / mL, add the nitrate of lithium, nickel and manganese, add ammonium heptamolybdate and lithium fluoride, wherein, Mo 6+ and F - The moles are respectively 6.0% and 1.5% of the total moles of heavy metal ions. Add citric acid as a complexing agent to make a mixed solution, stir at 80 °C for 1 h, wait for it to cool to form a gel, prepare the precursor powder by freeze-drying, and sinter the precursor powder at 950 °C for 10 h to obtain Mo and F Lithium-rich cathode material modified by ion synergistic doping, the chemical formula is Li 1.188 mn 0.6 Ni 0.152 Mo 0.048 o 1.988 f 0.012 , as a nucleosome;

[0058] (2) preparation concentration is the tartaric acid solution of 3mg / mL;

[0059] (3) Take 1 g of nucleosome material powder an...

Embodiment 3

[0062] Example 3: Mo and F ion synergistic doping and spinel in-situ coating modification applied to lithium-rich manganese-based cathode material Li 1.2 mn 0.6 Ni 0.2 o 2

[0063] (1) prepare the agar solution that concentration is 50mg / mL, add the nitrate of lithium, nickel and manganese, add ammonium heptamolybdate and lithium fluoride, wherein, Mo 6+ and F - The moles are respectively 4.0% and 1.0% of the total moles of heavy metal ions. Add citric acid as a complexing agent to make a mixed solution, stir at 80 °C for 1 h, wait for it to cool to form a gel, prepare the precursor powder by freeze-drying, and sinter the precursor powder at 950 °C for 10 h to obtain Mo and F Lithium-rich cathode material modified by ion synergistic doping, the chemical formula is Li 1.19 mn 0.6 Ni 0.168 Mo 0.032 o 1.99 f 0.01 as nucleosomes;

[0064] (2) preparing a cysteine ​​solution with a concentration of 1 mg / mL;

[0065] (3) Take 1 g of nucleosome material powder and add it...

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Abstract

The invention discloses a lithium-rich positive electrode material co-doped by molybdenum and fluorine and coated by spinel in situ, and a preparation method thereof, belonging to the technical fieldof lithium ion battery materials. The lithium-rich positive electrode material comprises a molybdenum / fluorine co-doped lithium-rich material nuclear body and a spinel coating formed on the surface ofthe nuclear body in situ. The molybdenum / fluorine co-doped lithium-rich material nuclear body has the molecular formula of Li<1.2-delta>MnNi<b-lambda>Co<c>Mo<lambda>O<2-delta>F<delta>. The preparation method for the material comprises the following steps: firstly, preparing a molybdenum / fluorine co-doped lithium-rich material; then subjecting the molybdenum / fluorine co-doped lithium-rich material to surface treatment with reducing organic acid under certain conditions; and carrying out subsequent sintering to allow the spinel coating to be formed on the surface of the nuclear body in situso as to prepare the lithium-rich positive electrode material with excellent electrochemical properties. The preparation method provided by the invention is simple and easy to control, and can preparethe nano-scale high-performance lithium-rich positive electrode material with good consistency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a molybdenum / fluorine co-doped and spinel in-situ coated lithium-rich cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries, as an advanced energy storage and conversion device, have shown great application prospects in the fields of hybrid electric vehicles, pure electric vehicles, and energy storage. However, due to the limited energy density of currently commercialized lithium-ion battery cathode materials, the further development of lithium-ion batteries in the above fields is restricted. Therefore, the development of high-energy-density lithium-ion battery cathode materials is particularly important. In recent years, lithium-rich ternary cathode materials, xLi 2 MnO 3 ·(1-x)LiMO 2 , where M=Mn 1-y-z Ni y co z , 0≤y≤1, 0≤z≤1, 0<y+z≤1, has many advantages such as high discharge specific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 王永刚史凌俊向德波
Owner TIANNENG SAFT ENERGY JOINT CO
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