Battery diaphragm, power battery and vehicle

A battery separator and potential technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of limited improvement in battery energy density, harsh operating environment requirements, and difficulty in large-scale production. The effect of improving electrical conductivity, electrochemical performance, and improving stability

Active Publication Date: 2019-10-01
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, power battery and vehicle

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preparation example Construction

[0067] The second purpose of the present application is to provide a method for preparing a battery separator, including:

[0068] (1) Mixing and sintering nuclear materials, organic carbon sources and metal carbides under an inert atmosphere to prepare lithium-replenishing materials, the nuclear materials including lithium ion compounds;

[0069] (2) Uniformly mixing the lithium-replenishing material, the first binder, and the solvent to obtain a slurry, attaching the slurry to one side of the porous base membrane, and then drying to prepare a separator.

[0070] 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.

[0071] Preferably, step (1) is specifically sintering the lithium ion compound and the organic carbon source under an inert atmosphere, the sintering temperature is 5...

Embodiment 1

[0087] Will Li 5 FeO 4 Powder (the average particle size is 50nm, the first delithiation capacity is greater than 500mAh / g, the first lithium intercalation capacity is less than 100mAh / g, the difference is greater than 400mAh / g), glucose and Mo 2 C is mixed in a mass ratio of 90:15:7, placed in a stirring ball mill, added with ethanol, and wet mixed and ground for 6 hours; the precursor prepared by fully mixed and ground is dried and placed in a corundum crucible; the crucible is placed in In a tube furnace, Ar gas was introduced, heated from room temperature, heated to 550 °C for 24 h, and then naturally cooled to room temperature to obtain Li 5 FeO 4 , C and Mo 2 Lithium-supplementing materials Li with C content of 90wt.%, 3 wt.% and 7wt.% respectively 5 FeO 4 / C+Mo 2 C, where C and Mo 2 The thickness of the C cladding layer was 4 nm.

[0088] Based on the total mass of the lithium supplement material and polyvinylidene fluoride, 95 parts by weight of Li 5 FeO 4 / C+M...

Embodiment 2

[0091] Will Li 6 CoO 4 (The average particle size is 5μm, the first delithiation capacity is greater than 500mAh / g, the first lithium intercalation capacity is less than 150mAh / g, and the difference is greater than 350mAh / g), glucose and TiC nanoparticles are mixed according to the mass ratio of 90:15:7, placed In a stirring ball mill, add ethanol, wet mixing and grinding for 6 hours; dry the precursor prepared by mixing and grinding, and place it in a corundum crucible; put the crucible in a tube furnace, feed Ar gas, and start heating from room temperature. The heating rate is 5°C / min, the temperature is raised to 600°C and roasted for 24h, and then naturally cooled to room temperature to obtain Li 6 CoO 4 , C and TiC contents of 90wt.%, 3 wt.% and 7wt.% Lithium-supplementing material Li 6 CoO 4 / C+Mo 2 C, where C and Mo 2 The thickness of the C cladding layer is 50 nm.

[0092] Based on the total mass of the lithium supplement material and polyvinylidene fluoride, 95...

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Abstract

The invention provides a battery diaphragm including 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, and the material of the coating layer comprises carbon and metal carbide. The invention also provides a power battery and a vehicle. The power battery includes a positive electrode, a negative electrode and the diaphragm, and the lithium-replenishing coating of the battery diaphragm just faces the positive electrode. The vehicle includes the power battery. According to the invention, the battery is prepared by forming the lithium-replenishing coating at one side of the battery diaphragm and allowing the lithium-replenishing coating of the diaphragm to face a positive electrode piece, thebattery capacity is greatly improved, and the diaphragm has good mechanical properties and high-temperature resistance performance.

Description

technical field [0001] The application belongs to the technical field of power batteries, and in particular relates to a battery diaphragm power battery and a vehicle. 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 to suppleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/431H01M50/403B60L50/64Y02E60/10
Inventor 焦晓朋李世彩
Owner BYD CO LTD
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