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Modification method of lithium nickelate, cobaltate and manganate ternary material

A technology of nickel-cobalt lithium manganese oxide and ternary materials, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve problems affecting electrical properties, improve electronic conductivity, improve charge and discharge efficiency, and improve lithium Effect of ion diffusion coefficient

Active Publication Date: 2017-02-22
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional high-temperature pyrolysis method is easy to reduce the lithium nickelate in the ternary material during the carbon coating process, thus affecting its electrical properties.

Method used

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  • Modification method of lithium nickelate, cobaltate and manganate ternary material
  • Modification method of lithium nickelate, cobaltate and manganate ternary material

Examples

Experimental program
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Effect test

preparation example Construction

[0051] The present invention has no special limitation on the preparation method of the positive electrode, and the conventional preparation method of the NCM lithium ion battery positive electrode well known to those skilled in the art can be used. The modified NCM ternary positive electrode material and conductive agent prepared by the above method are preferred in the present invention. After mixing and stirring with a binder, a slurry is prepared, and the slurry is coated on an aluminum foil current collector, dried and cut to obtain a lithium-ion battery cathode material electrode sheet.

[0052] The above steps of the present invention deposit carbon on the surface of nickel-cobalt lithium manganese oxide ternary material by vapor deposition method, thereby realizing carbon coating. Carbon coating, especially preferably using carbon source gas and carbon dioxide as the gas source for chemical vapor deposition for carbon coating of ternary materials, by controlling the flo...

Embodiment 1

[0056] Weigh 5g of the ternary material and place it in the quartz boat 5, then put the quartz boat into the middle of a horizontally placed quartz tube, and then send the quartz tube into the high temperature zone of the heating furnace.

[0057] Open the gas valve of the argon gas cylinder at 1, adjust the gas flow rate to 50 mL / min, and ventilate for 30 min to exhaust the air in the quartz tube 6. Then close the gas valve of the argon cylinder at 1, and open the carbon dioxide (CO2) at 2 2 ) cylinders and methane (CH 4 ) of the gas cylinder, the air flow rate is adjusted to 50mL / min, and carbon dioxide and methane are simultaneously introduced into the quartz tube.

[0058] Turn on the heating furnace 4, set the heating rate to 20°C / min, raise the quartz tube from room temperature to 1000°C, and keep it at 1000°C for 15 minutes to allow methane to crack and form a carbon layer to deposit on the surface of the ternary material.

[0059] After the reaction is over, stop hea...

Embodiment 2

[0064] Weigh 5g of the ternary material and place it in the quartz boat 5, then put the quartz boat into the middle of a horizontally placed quartz tube, and then send the quartz tube into the high temperature zone of the heating furnace.

[0065] Open the gas valve of the argon gas cylinder at 1, adjust the gas flow rate to 50 mL / min, and ventilate for 30 min to exhaust the air in the quartz tube 6. Then close the gas valve of the argon gas cylinder at 1 place, open the gas valves of the 2 carbon dioxide gas cylinders and the 3 methane gas cylinders, adjust the gas flow to 50mL / min and 80mL / min respectively, and simultaneously feed carbon dioxide and gas into the quartz tube. methane.

[0066]Turn on the heating furnace 4, set the heating rate to 25°C / min, raise the quartz tube from room temperature to 1100°C, and keep it at 1100°C for 20 minutes to allow methane to crack and form a carbon layer to deposit on the surface of the ternary material.

[0067] After the reaction i...

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Abstract

The invention provides a modification method of a lithium nickelate, cobaltate and manganate ternary material. The method comprises the step that after a lithium nickelate, cobaltate and manganate material is subjected to vapor phase deposition under the conditions of carbon source gas and protective gas, a carbon-coated modified lithium nickelate, cobaltate and manganate material is obtained. The modification method provided by the invention has the benefits that carbon deposits on the surface of the lithium nickelate, cobaltate and manganate ternary material through a vapor phase deposition method, so that carbon coating is realized; by adopting simpler processes, with the aid of the protective gas, the ternary material is carbon-coated, so that the problem of lithium nickelate reduction in the coating process of a traditional ternary material is effectively solved, and the coating of a carbon layer on the surface of the ternary material is realized; through the lithium nickelate, cobaltate and manganate ternary material coating carbon, the first-time charging and discharging efficiencies are improved, the lithium ion diffusion coefficients and the electronic conductivity of the material are improved, and the electrochemical performance of the NCM material is improved. According to the modification method provided by the invention, equipment is relatively simple, the process is less, and the structure is controllable; the material has higher battery capacity, cycle performance and rate capability.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials, and relates to a modification method of a nickel-cobalt lithium manganese oxide ternary material, in particular to a carbon coating modification method of a nickel-cobalt lithium manganese oxide ternary material. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields. The main choice of power supply, portable electronic products and new energy vehicles, is the ideal energy storage and output power supply for new energy vehicles recognized internationally today. Therefore, lithium-ion batteries and related materials have become a research hotspot for researchers. Cathode material is one ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 钟宽王文华段科李乾乾田静钟署亮王晋
Owner GREE ELECTRIC APPLIANCES INC
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