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Carbon-metal oxide composite coated lithium battery ternary positive electrode material and preparation method thereof, and lithium battery

A positive electrode material and oxide technology, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems affecting electrochemical activity, improve electronic conductivity and ion diffusion coefficient, increase electronic conductivity, and reduce side effects. The effect of the reaction

Active Publication Date: 2018-08-10
桑德新能源技术开发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a carbon-metal oxide composite-coated lithium battery ternary positive electrode material, its preparation method and lithium battery, so as to solve the problem that the metal oxide-coated ternary positive electrode material affects the electrochemical performance of the prior art. activity problem

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  • Carbon-metal oxide composite coated lithium battery ternary positive electrode material and preparation method thereof, and lithium battery
  • Carbon-metal oxide composite coated lithium battery ternary positive electrode material and preparation method thereof, and lithium battery
  • Carbon-metal oxide composite coated lithium battery ternary positive electrode material and preparation method thereof, and lithium battery

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preparation example Construction

[0028]In another typical embodiment of the present application, a method for preparing a carbon-metal oxide composite-coated lithium battery ternary positive electrode material is provided, the preparation method comprising: mixing MOFs with a ternary positive electrode material matrix, A mixture is formed; in a nitrogen atmosphere or an inert atmosphere, the mixture is sintered at 300-800° C. to obtain a carbon-metal oxide composite-coated lithium battery ternary cathode material. Furthermore, the above-mentioned sintering temperature is preferably 600-750°C.

[0029] MOFs (Metal-Organic Frameworks, metal-organic framework materials) are organic-inorganic hybrid materials with intramolecular pores formed by the self-assembly of organic ligands and metal ions or clusters through coordination bonds. MOFs-derived hybrid micro-nanostructures exhibit enhanced performance compared to their respective counterparts due to the synergistic effect between different components, which is ...

Embodiment 1

[0044] Preparation of Precursor Ni by Hydroxide Co-precipitation 0.5 co 0.2 mn 0.3 (OH) 2 , and then combine the precursor with Li 2 CO 3 Mix evenly according to the molar ratio of Li to metal 1:1.05, sinter at 950°C for 10 hours in an air atmosphere, crush, and pass through a 300-mesh sieve to obtain LiNi 0.5 co 0.2 mn 0.3 o 2 .

[0045] Preparation of Ti-MIL-125 by solvothermal method: dissolve the organic ligand phthalic acid in a mixed solvent of DMF and methanol, and mix it uniformly by ultrasonic to obtain a transparent mixed solution, add tetrabutyl titanate to the mixed solution, and continue to mix evenly by ultrasonic After that, it was added to a polytetrafluoroethylene-lined stainless steel reactor at 150°C for 48 hours, solid-liquid separation, washing, and drying in a vacuum oven at 50°C for 24 hours to obtain carbon and metal Ti oxide precursor Ti-MIL-125.

[0046] According to metal oxide and LiNi 0.5 co 0.2 mn 0.3 o 2 The mass ratio of 2.0%: 1 wei...

Embodiment 2

[0057] Preparation of Precursor Ni by Hydroxide Co-precipitation 0.5 co 0.2 mn 0.3 (OH) 2 , and then the precursor with Li 2 CO 3 Mix evenly according to the molar ratio of Li to metal 1:1.05, sinter at 950°C for 10 hours in an air atmosphere, crush, and pass through a 300-mesh sieve to obtain LiNi 0.5 co 0.2 mn 0.3 o 2 .

[0058] Solvothermal preparation of UiO-66: 1,4-phthalic acid (H 2 BDC) and ZrCl 4 Dissolve in DMF at room temperature, mix evenly and seal to obtain a mixed solution, add the above mixed solution into a polytetrafluoroethylene-lined stainless steel reactor at 120°C for 24 hours, separate the solid from the liquid, wash the solid with DMF, and then dry the solid at room temperature. The carbon and metal Zr oxide precursor UiO-66 was obtained.

[0059] According to the same sequence as in Example 1, the mass ratio of the metal oxide to the metal oxide was 2.0%: 1 and the above-mentioned UiO-66 and LiNi 0.5 co 0.2 mn 0.3 o 2 Add deionized water ...

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Abstract

The invention provides a carbon-metal oxide composite coated lithium battery ternary positive electrode material and a preparation method thereof, and a lithium battery. The carbon-metal oxide composite coated lithium battery ternary positive electrode material comprises a ternary positive electrode material matrix and a composite coating material, wherein the composite coating material comprisesa carbon-metal oxide complex. According to the present invention, the composite coating material contains the carbon-metal oxide complex, such that the advantages of the carbon coating and the metal oxide are integrated, wherein the carbon coating can effectively improve the electronic conductivity and the ion diffusion coefficient of the material, reduce the agglomeration, effectively prevent theelectrolyte from eroding on the positive electrode material, stabilize the structure of the material, and improve the electronic conductivity, the rate performance and the cycle performance of the material so as to ensure the rapid transmission of the Li<+> on the material surface and the electrochemical activity, and the amorphous metal oxide coating can reduce the side reaction between the electrode material and the electrolyte and improve the ionic conductivity so as to maximize the comprehensive performance.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a carbon-metal oxide composite-coated lithium battery ternary cathode material, a preparation method thereof and a lithium battery. Background technique [0002] In recent years, due to its high energy density, fast charging characteristics, high safety and low cost, lithium-ion batteries have seen a surge in application demand in the fields of electric vehicles and energy storage. Since the development of lithium-ion batteries, the cathode material has been a key factor restricting its further development. The current commercial lithium battery cathode materials mainly include layered lithium cobaltate, ternary materials, spinel-structured lithium manganate and olivine-structured lithium iron phosphate. [0003] Nickel cobalt lithium manganate ternary material NCM synthesizes LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three materials, NCM performance is better than ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张鹏苗力孝陈橙
Owner 桑德新能源技术开发有限公司
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