Ternary anode material and preparation method thereof

A technology of ternary materials and positive electrode materials, applied in the field of electrochemical materials, can solve the problems of reducing the first discharge capacity, etc., and achieve the effects of improving electrochemical performance, suppressing side reactions, and great practicability

Inactive Publication Date: 2018-11-27
FOSHAN DYNANONIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used metal oxide coating materials are alumina and titanium oxide. Although these coating materials improve the cycle performance of ternary cathode materials to a certain extent, they also reduce their initial discharge capacity.

Method used

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  • Ternary anode material and preparation method thereof
  • Ternary anode material and preparation method thereof
  • Ternary anode material and preparation method thereof

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preparation example Construction

[0033] A method for preparing a ternary positive electrode material provided in an embodiment of the present invention includes the following preparation steps:

[0034] Step 1: providing a vanadium source, dissolving the vanadium source in deionized water and dispersing it uniformly to form a coating solution;

[0035] Step 2: adding the ternary material precursor to the coating solution and dispersing it evenly to obtain a mixed solution, then heating the mixed solution to evaporate the solvent in the mixed solution to obtain a mixed material;

[0036] Step 3: mixing the lithium source with the mixed material and sintering in an oxygen atmosphere to form a vanadium oxide-coated ternary material to obtain a ternary positive electrode material.

[0037]First of all, in the prior art, when the ternary material precursor and the lithium source form a ternary material, a sintering is required, and when the ternary material and the vanadium source form a vanadium oxide-coated tern...

Embodiment 1

[0049] A preparation method of a ternary positive electrode material, comprising the following steps:

[0050] Step 1: Take 15.02g of vanadium pentoxide, dissolve the vanadium pentoxide in 5000g of deionized water, stir and disperse evenly, and form a coating solution;

[0051] Step 2: Add 1kg of Ni 0.8 co 0.1 mn 0.1 (OH) 2 Add it into the coating solution and stir to disperse evenly to obtain a mixed solution, then heat and dry at 100°C for 5 hours, and then grind to obtain a mixed material;

[0052] Step 3: Mix 510.05g of lithium hydroxide monohydrate with the mixed material and place it in oxygen for sintering. The specific process of sintering is to pre-sinter at 600°C for 5 hours from room temperature at a heating rate of 5°C / min, and continue The temperature was raised to 780h at a heating rate of 5°C / min and sintered for 20h to finally obtain a ternary cathode material.

Embodiment 2

[0054] A preparation method of a ternary positive electrode material, comprising the following steps:

[0055] Step 1: Take 10 g of vanadyl oxalate, dissolve vanadyl oxalate in 500 g of deionized water, stir and disperse evenly, and form a coating solution;

[0056] Step 2: Add 1kg of Ni 0.8 co 0.1 mn 0.1 (OH) 2 Add it into the coating solution and stir to disperse evenly to obtain a mixed solution, then heat and dry at 150°C for 3 hours, and then grind to obtain a mixed material;

[0057] Step 3: Mix 510.05g of lithium hydroxide monohydrate with the mixed material and place it in oxygen for sintering. The specific process of sintering is to heat up from room temperature at a rate of 5°C / min to 500°C for 8 hours, and continue The temperature was raised to 900h at a heating rate of 5°C / min and sintered for 10h to obtain a ternary cathode material.

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Abstract

The invention provides a ternary anode material. The material comprises a ternary material and a coating layer coating the surface of the ternary material, wherein the coating layer is prepared from vanadium oxide which is 0.1-10 percent of the mass of the ternary anode material. According to the ternary anode material, the surface of the ternary material is coated with the vanadium oxide layer, so that the transmission rate of the lithium ions of the ternary anode material can be effectively improved, the side reaction generated by direct contact of the ternary material and electrolyte can beinhibited since the contact area between the ternary material and electrolyte is reduced, corrosion of the electrolyte for the surface of the ternary material is reduced, the electrochemical performance of the ternary anode material is improved, and the cycling performance of the ternary anode material is improved. The invention further provides a method for preparing the ternary anode material,the ternary material coated with vanadium oxide can be prepared by once sintering process by improving the preparation process, and time and cost for processing can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, and in particular relates to a ternary cathode material and a preparation method thereof. Background technique [0002] With the rapid growth of the new energy vehicle industry, the market is increasingly favoring high energy density batteries. Ternary cathode materials have been sought after by the market for their high gram capacity and good cycle stability. However, the low safety of ternary cathode materials, especially poor cycle performance and rate, greatly limits its application. [0003] Currently, surface coating is the most widely used method to improve the cycle performance of ternary cathode materials. The cladding materials are mainly metal oxides, fluorides, phosphates, etc. At present, the most widely used metal oxide coating materials are alumina and titanium oxide. Although these coating materials improve the cycle performance of ternary cathode materials to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 孔令涌陈彩凤尚伟丽陈燕玉任诚
Owner FOSHAN DYNANONIC
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