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Battery diaphragm and lithium ion battery

A battery separator, lithium ion technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as low safety, harsh operating environment requirements, and difficulty in large-scale production

Active Publication Date: 2019-09-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In related technologies, there is a compound that can deintercalate lithium ions in the ceramic coating to increase the energy density of the battery, but the improvement of the energy density of the battery is limited, and lithium powder is also added to the ceramic coating. The environment is harsh, the security is low, and it is difficult to produce on a large scale

Method used

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  • Battery diaphragm and lithium ion battery

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Effect test

preparation example Construction

[0050] The second purpose of the present application is to provide a method for preparing a battery separator, including:

[0051] (1) Mixing and sintering the organic carbon source and the lithium ion compound, the organic carbon source is melted and carbonized to form a carbon coating layer on the surface of the lithium ion compound, and the lithium supplement material is prepared;

[0052] (2) Uniformly mixing the lithium-supplementing material, the first binder and the first solvent to obtain a slurry, attaching the slurry to one side of the porous base membrane, and then drying to prepare a separator.

[0053] According to the preparation method of the battery separator provided in the present application, the organic carbon source is selected from one or more of sucrose, glucose, epoxy resin, sucrose, lactose, maltose, polyvinyl alcohol and phenolic resin.

[0054] According to the preparation method of the battery separator provided in this application, the step (1) is ...

Embodiment 1

[0066] Will Li 2 MnSiO 4 The powder (average particle size is 100nm, the lithium intercalation potential of the delithiated product is less than 3V) and glucose are mixed at a mass ratio of 95:25, placed in a stirring ball mill, added with ethanol, wet mixed and ground for 6 hours; fully mixed The precursor prepared by grinding was dried and placed in a corundum crucible; the crucible was placed in a tube furnace, and Ar gas was introduced, and heated from room temperature at a heating rate of 5 °C / min, and the temperature was raised to 600 °C for 10 h, and then naturally After cooling to room temperature, Li with a carbon content of 5wt.% was obtained 2 MnSiO 4 / C lithium supplement material, the thickness of the in-situ carbon coating layer is 2nm.

[0067] Based on the total mass of alumina and polyvinylidene fluoride, add 97 parts by weight of alumina and 3 parts by weight of polyvinylidene fluoride to 50 parts by weight of N-methylpyrrolidone, and stir at high speed fo...

Embodiment 2

[0071] Will Li 2 MoO 3 The powder (average particle size is 500nm, the lithium intercalation potential of the delithiated product is lower than 3V) is mixed with glucose at a mass ratio of 98:10, placed in a stirring ball mill, added with ethanol, wet mixed and ground for 6 hours; fully The precursor prepared by mixing and grinding was dried and placed in a corundum crucible; the crucible was placed in a tube furnace, and Ar gas was introduced, and heated from room temperature at a heating rate of 5 °C / min, and the temperature was raised to 550 °C for 24 h, and then Naturally cooled to room temperature, the prepared Li with a carbon content of 2wt.% 2 MoO 3 / C lithium supplement material, the thickness of the in-situ carbon coating layer is 5nm.

[0072] Based on the total mass of the lithium supplement material and polytetrafluoroethylene, 95 parts by weight of Li 2 MoO 3 / C Li-supplementing material and 5 parts by weight of polytetrafluoroethylene are added to 50 parts ...

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Abstract

The application provides a battery diaphragm and a lithium ion battery. The battery diaphragm comprises a porous base film and a lithium-replenishing coating attached to one side of the porous base film. The lithium-replenishing coating comprises a lithium-replenishing material and a first binder. The lithium-replenishing material comprises a core and a coating layer on the surface of the core. The material of the core comprises a lithium ion compound. The material of the coating layer comprises carbon. The lithium ion compound has a first delithiated capacity greater than a first lithiated capacity, or the lithiated potential of a delithiated product of the lithium ion compound is less than or equal to 3V. The application further provides a lithium ion battery comprising a positive electrode, a negative electrode and a diaphragm, wherein the lithium-replenishing coating of the battery diaphragm is opposite to the positive electrode. The battery is prepared by forming the lithium-replenishing coating in one side of the battery diaphragm and arranging the lithium-replenishing coating of the diaphragm opposite to the positive electrode, thus, the battery capacity is greatly improved.Further, the diaphragm also has good mechanical properties and high temperature resistance.

Description

technical field [0001] The present application belongs to the technical field of lithium-ion batteries, and in particular relates to a battery diaphragm and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in technical fields such as electric vehicles, digital and energy storage systems due to their high energy density, high cycle performance, and environmental friendliness. However, with the continuous expansion of the application field of lithium-ion batteries, higher requirements are put forward for the energy density of lithium-ion batteries. Therefore, the application of lithium supplementation technology is particularly important. At present, the lithium supplementation process is mainly divided into two categories: 1) the positive electrode lithium supplementation process; 2) the negative electrode lithium supplementation process. Lithium supplementation of the negative electrode generally uses lithium powder and lithium foil...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 焦晓朋李世彩
Owner BYD CO LTD
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