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Battery diaphragm and lithium ion battery

A battery diaphragm and lithium-ion technology, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of limited battery energy density improvement, difficulty in large-scale production, and low safety

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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preparation example Construction

[0052] The second purpose of the present application is to provide a method for preparing a battery separator, including:

[0053] (1) Mixing the conductive polymer monomer and the lithium ion compound, the conductive polymer monomer undergoes an in-situ polymerization reaction on the surface of the lithium ion compound to form a conductive polymer coating layer, and prepare a lithium supplement material;

[0054] (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.

[0055] The conductive polymer monomer forms a conductive polymer coating layer on the surface of the lithium ion compound by chemical oxidation polymerization or plasma polymerization; preferably plasma polymerization.

[0056] The preparation of chemical oxidative polymerization is well known in the art and will not be repeated here.

[0057] The plasma p...

Embodiment 1

[0070] 10g weight of Li 2 MnSiO 4 The powder (the average particle size is 100nm, and the lithium intercalation potential of the delithiated product is lower than 3V) is added to the plasma reactor, stirred in real time with a water bath magnetic stirrer, and the temperature is controlled to 59~61°C. Pass the working gas N into the reactor at a flow rate of 10 ml / min 2 , and at the same time pass carrier gas H into the storage bottle containing liquid pyrrole monomer at a flow rate of 15 ml / min 2 , pyrrole vapor and carrier gas H 2 together into the plasma reactor. The reactor was continuously evacuated with a mechanical vacuum pump to maintain a vacuum of 12 Pa in the reactor. Turn on the radio frequency power source, adjust the voltage to 50V, and the current to 20mA to generate plasma discharge in the reactor. The pyrrole monomer undergoes a polymerization reaction under the action of plasma to generate a conductive polymer polypyrrole, which is coated in Li 2 MnSiO ...

Embodiment 2

[0075] 10g weight of Li 2 MoO 3 (The average particle size is 200nm, and the lithium intercalation potential of the delithiated product is lower than 3V). Put the powder into the plasma reactor, stir it in real time with a water bath magnetic stirrer, and control the temperature to 59~61°C. Pass the working gas N into the reactor at a flow rate of 10 ml / min 2 At the same time, the carrier gas H was passed into the organic monomer storage bottle filled with liquid aniline at a flow rate of 10 ml / min. 2 , aniline vapor and carrier gas H 2 together into the plasma reactor. The reactor was continuously evacuated with a mechanical vacuum pump to maintain a vacuum of 12 Pa in the reactor. Turn on the radio frequency power source, adjust the voltage to 30V, and the current to 20mA to generate plasma discharge in the reactor. The aniline monomer undergoes a polymerization reaction under the action of plasma to generate conductive polymer polyaniline, which is coated in Li 2 MoO ...

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Abstract

The application provides a battery diaphragm comprising a porous base film and a lithium-replenishing coating attached to one side of the porous base film. The lithium-replenishing coating comprises alithium-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 a conductive polymer. The lithium ion compound has a first delithiated capacity greater than a first lithiated capacity, or the lithiated potentialof 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 thebattery 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): H01M2/16H01M2/14H01M10/0525H01M50/409H01M50/431H01M50/449H01M50/489
CPCH01M10/0525H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 焦晓朋李世彩
Owner BYD CO LTD
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