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Lithium supplementation device and method for positive and negative electrode materials of lithium ion battery by CVD

A lithium-ion battery, positive and negative electrode technology, applied in the direction of battery electrodes, secondary batteries, metal material coating technology, etc., can solve the problems of difficult mixing and uniform coating of lithium supplementation, local lithium enrichment, etc.

Active Publication Date: 2021-04-23
LANXI ZHIDE ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a device and method for CVD lithium supplementation of positive and negative materials of lithium-ion batteries, which solves the technical problems of local lithium enrichment and difficulty in mixing and uniform coating of lithium supplementation in existing solutions

Method used

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  • Lithium supplementation device and method for positive and negative electrode materials of lithium ion battery by CVD
  • Lithium supplementation device and method for positive and negative electrode materials of lithium ion battery by CVD
  • Lithium supplementation device and method for positive and negative electrode materials of lithium ion battery by CVD

Examples

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Embodiment 1

[0068] Put 7kg of SiO powder into the jet mill for shaping to remove the surface oxide film. Then pass methane gas in the CVD furnace for reduction and carbon coating for 2 hours, and the coated SiO / C composite negative electrode powder is demagnetized by a magnetic separator. Argon gas with a flow rate of 1L / min is introduced into the delivery pipeline as a protective atmosphere, and then the pre-treated silicon oxide / carbon composite negative electrode powder is transported to the deposition chamber through a closed pipeline.

[0069] LiCl is selected as the lithium source, and an argon gas with a flow rate of 1L / min is introduced into the delivery pipeline as a protective atmosphere, and then LiCl is delivered to the sublimation or cracking chamber. The sublimation or cracking chamber is heated to 950°C by resistance to vaporize the LiCl. The deposition chamber is evacuated, and the vacuum degree is controlled at 100Pa. The vaporized LiCl is deposited on the surface of the...

Embodiment 2

[0073] Put 7kg of SiO powder into the jet mill for shaping to remove the surface oxide film. Then pass methane gas in the CVD furnace for reduction and carbon coating for 2 hours, and the coated SiO / C composite negative electrode powder is demagnetized by a magnetic separator. Argon gas with a flow rate of 1L / min is introduced into the delivery pipeline as a protective atmosphere, and then the pre-treated silicon oxide / carbon composite negative electrode powder is transported to the deposition chamber through a closed pipeline.

[0074] Choose Li 3 N is used as a lithium source, and a nitrogen gas with a flow rate of 1L / min is introduced into the delivery pipeline as a protective atmosphere, and then the Li 3 N is delivered to the sublimation or lysis chamber. The sublimation or cracking chamber is heated to 950°C by resistance to make the Li 3 N cleavage. The deposition chamber is evacuated, and the vacuum degree is controlled at 500Pa. The pyrolysis gas is deposited on t...

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Abstract

The invention provides a device and method for CVD lithium replenishment of positive and negative electrode materials of lithium ion batteries, and relates to the technical field of lithium ion battery replenishment. It includes a positive and negative electrode material pretreatment device, a lithium source sublimation or cracking device, a deposition chamber, and a grading and discharging device. The positive and negative electrode material pretreatment device is used for pretreatment of positive and negative electrode materials. The lithium source sublimation or cracking device is used to heat the lithium source for sublimation or cracking to generate a gaseous lithium source. The positive and negative materials pretreated in the positive and negative material pretreatment device are transported to the deposition chamber in a closed pipeline. The lithium source sublimated in the lithium source sublimation or cracking device is transported to the deposition chamber in a closed pipeline, and the gaseous lithium source is deposited on the surface of the positive and negative electrode materials to complete the lithium replenishment operation. The grading and discharging device is communicated with the deposition chamber, and is used for grading the mixture after lithium supplementation is completed. The lithium source is atomized in the CVD process, uniformly coated on the surface of the positive and negative electrode materials and diffused into the interior, with strong adhesion and good stability.

Description

technical field [0001] The invention relates to the technical field of lithium supplementation for lithium ion batteries, in particular to a device and method for supplementing lithium by CVD of positive and negative electrode materials of lithium ion batteries. Background technique [0002] During the first cycle of lithium-ion batteries, there are processes such as the formation of negative electrode SEI, the inactivation of negative electrode material particles due to shedding, and the irreversible deposition of lithium metal, which consume the active lithium of the positive electrode and reduce the energy density of the battery. [0003] Lithium supplementation technology is used to pre-compensate the loss of active lithium during the first charge and discharge. It can increase the reversible capacity of the battery in the first week, increase the actual battery energy density, realize the pre-expansion of the volume of the negative electrode material, reduce the rupture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/06C23C16/448C23C16/455C23C16/54H01M4/139H01M10/0525
CPCC23C16/06C23C16/448C23C16/455C23C16/54H01M4/139H01M10/0525Y02E60/10
Inventor 陈青华伍小波胡盼房冰刘江平
Owner LANXI ZHIDE ADVANCED MATERIALS CO LTD