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Carbon coated ternary cathode material and preparation method thereof

A positive electrode material and carbon coating technology, which is applied in the field of carbon coated ternary positive electrode materials and its preparation, can solve the problems of high deposition temperature and influence on the electrochemical performance of lithium-ion batteries, achieve simple process flow, improve processing performance and Effect of electrochemical performance and strong application prospects

Active Publication Date: 2018-07-06
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the preparation process of chemical vapor deposition, the deposition temperature is usually high, and the excessively high deposition temperature will cause redox reaction of the carbon-coated ternary positive electrode material, and then generate impurity phases, which will eventually affect the electrochemical performance of lithium-ion batteries.

Method used

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  • Carbon coated ternary cathode material and preparation method thereof
  • Carbon coated ternary cathode material and preparation method thereof
  • Carbon coated ternary cathode material and preparation method thereof

Examples

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preparation example Construction

[0027] Please refer to figure 1 , a method for preparing a carbon-coated ternary cathode material provided in an embodiment of the present invention, comprising the following steps:

[0028] Step 1: Take the ternary positive electrode material, place the ternary positive electrode material in a container, place the container in a chemical vapor deposition equipment with a cooling device, and place the container in the cooling device Directly above, the cooling device is used to keep the temperature of the ternary cathode material in the container at -30°C to 70°C;

[0029] Step 2: Pass the organic carbon source into the reaction chamber of the chemical vapor deposition equipment, and raise the temperature of the catalyst in the reaction chamber to 400°C-1100°C, so that the organic carbon source is decomposed by catalysis generating carbon nanomaterials, and then depositing the carbon nanomaterials on the surface of the ternary positive electrode material by vapor deposition t...

Embodiment 1

[0045] A method for preparing a carbon-coated ternary positive electrode material, comprising the following steps:

[0046] Step 1: Take 10g LiNi 0.8 co 0.15 Al 0.05 o 2 The ternary positive electrode material is evenly spread in the square boat, and then the square boat is placed in the chemical vapor deposition equipment containing the compression cycle cooling device, and the square boat is placed directly above the compression cycle cooling device, which is used for the compression cycle cooling device LiNi in the square boat 0.8 co 0.15 Al 0.05 o 2 The temperature of the ternary cathode material is always at -20°C;

[0047] Step 2: First, pass argon gas for 15 minutes to evacuate the air in the reaction chamber. Wherein, the flow rate of argon is 100ml / min. Secondly, the liquid organic carbon source is passed into the reaction chamber of the chemical vapor deposition equipment through argon gas, wherein the liquid organic carbon source is ethanol, formaldehyde an...

Embodiment 2

[0050] A method for preparing a carbon-coated ternary positive electrode material, comprising the following steps:

[0051] Step 1: Take 10g LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary positive electrode material is evenly spread in the square boat, and then the square boat is placed in the chemical vapor deposition equipment containing the compression cycle cooling device, and the square boat is placed directly above the compression cycle cooling device, which is used for the compression cycle cooling device LiNi in the square boat 0.5 co 0.2 mn 0.3 o 2 The temperature of the ternary cathode material is always at 40°C;

[0052] Step 2: First, pass argon gas for 10 minutes to evacuate the air in the reaction chamber. Wherein, the flow rate of argon is 150ml / min. Secondly, the liquid organic carbon source is passed into the reaction chamber of the chemical vapor deposition equipment by argon gas, wherein, when the liquid organic carbon source is ethanol and methanol, the vo...

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Abstract

The invention provides a preparation method of a carbon coated ternary cathode material. The method comprises the following steps: putting a ternary cathode material into a container, and placing thecontainer in a chemical vapor deposition device provided with a cooling device, wherein the cooling device is used for enabling the temperature of the ternary cathode material in the container to be within a range of -30 to 70 DEG C; introducing an organic carbon source into a reaction chamber, decomposing the organic carbon source with a catalyst so as to form a nano carbon material, and then enabling the nano carbon material to be deposited on the surface of the ternary cathode material by means of vapor deposition; evenly distributing the nano carbon material on the surface of the ternary cathode material by means of ball milling so as to obtain the carbon-coated ternary cathode material. According to the preparation method, the cooling device can enable the ternary cathode material tobe within the temperature range of -30 to 70 DEG C in the preparation process, so that the generation of an impure phase of the ternary cathode material is inhibited. Finally, the preparation method not only reduces the pH value of the carbon coated ternary cathode material, but also improves the electrochemical performance of the carbon coated ternary cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a carbon-coated ternary cathode material and a preparation method thereof. Background technique [0002] As a green new energy product, lithium-ion battery has very important and broad application prospects. The positive electrode material determines the energy density, service life and safety performance of lithium-ion batteries. Therefore, cathode materials play an important role in lithium-ion batteries. Moreover, the electrochemical performance of the positive electrode material can be effectively improved by coating the carbon layer on the surface of the positive electrode material, and finally the performance of the lithium ion battery can be improved. [0003] At present, chemical vapor deposition is usually used to prepare carbon-coated ternary cathode materials. However, in the preparation process of chemical vapor deposition,...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/525H01M4/505H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/583H01M10/0525Y02E60/10
Inventor 孔令涌钟泽钦
Owner SHENZHEN DYNANONIC