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Method for cladding surfaces of active material of anode and/or anode and methods manufacturing anode and battery

A positive electrode active material and surface coating technology, which is applied to the surface coating of positive electrode active materials and/or positive electrodes and the preparation of positive electrodes and batteries, can solve the problems of difficult control of the thickness and uniformity of the coating layer, and achieve Uniform and complete coverage, low shape requirements, high specific capacity and specific energy

Inactive Publication Date: 2011-11-16
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the object of the present invention is to overcome the problem that the thickness and uniformity of the coating layer that exist in the method for surface coating of the positive electrode of the lithium battery in the prior art are not easy to control, and provide a method for controlling the positive electrode active material and / or a method for direct, uniform, and thickness-controllable coating on the surface of the positive electrode and a positive electrode preparation method and a battery preparation method comprising the surface coating method, thereby improving the performance of the coated positive electrode active material and its application in lithium batteries Electrochemical performance in

Method used

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  • Method for cladding surfaces of active material of anode and/or anode and methods manufacturing anode and battery
  • Method for cladding surfaces of active material of anode and/or anode and methods manufacturing anode and battery
  • Method for cladding surfaces of active material of anode and/or anode and methods manufacturing anode and battery

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Effect test

Embodiment 1

[0037] This embodiment is used to illustrate the method for surface coating the positive electrode and the preparation method of the positive electrode of the present invention.

[0038] (1) Preparation of positive electrode sheet:

[0039] 70 parts by weight of Li 1.2 Ni 0.17 Mn 0.54 Co 0.07 O 2 , 10 parts by weight of polyvinylidene fluoride (PVDF) and 20 parts by weight of acetylene black are added to 50 parts by weight of N-methylpyrrolidone (NMP) and stirred to form a slurry. The slurry was evenly coated on both sides of a 16 μm thick aluminum foil, and dried at 120° C. for 5 minutes to obtain a pole piece with a thickness of 200 μm (including the aluminum foil), and then the pole piece was pressed into a positive electrode sheet by a tablet press.

[0040] (2) Surface coated with Al 2 O 3 :

[0041] Using ALD deposition system (Savannah-100, Shijia Technology Co., Ltd.), when the reaction chamber vacuum reaches about 10 -2 During torr, the components of the atomic layer depositi...

Embodiment 2

[0059] This embodiment is used to illustrate the method for surface coating the positive electrode and the preparation method of the positive electrode of the present invention.

[0060] (1) Preparation of positive electrode sheet:

[0061] Put 85 parts by weight of LiMn 2 O 4 , 5 parts by weight of PVDF and 10 parts by weight of acetylene black are added to 50 parts by weight of NMP and mixed uniformly to form a slurry. The slurry was evenly coated on both sides of a 16 μm thick aluminum foil, and dried at 120° C. for 5 minutes to obtain a pole piece with a thickness of 200 μm (including the aluminum foil), and then the pole piece was pressed into a positive electrode sheet by a tablet press.

[0062] (2) Surface coated with ZrO 2 :

[0063] Using ALD deposition system (Savannah-100, Shijia Technology Co., Ltd.), when the reaction chamber vacuum reaches about 10 -2 During torr, the components of the atomic layer deposition system are heated. The temperature of the reaction chamber is...

Embodiment 3

[0076] This embodiment is used to illustrate the method for surface coating the positive electrode and the preparation method of the positive electrode of the present invention.

[0077] (1) Preparation of positive electrode sheet:

[0078] 75 parts by weight of LiFePO 4 , 10 parts by weight of PVDF and 15 parts by weight of acetylene black are added to 50 parts by weight of NMP and mixed uniformly to form a slurry. The slurry was evenly coated on both sides of a 16 μm thick aluminum foil, and dried at 120° C. for 5 minutes to obtain a pole piece with a thickness of 200 μm (including the aluminum foil), and then the pole piece was pressed into a positive electrode sheet by a tablet press.

[0079] (2) Surface coated with Si:

[0080] Using ALD deposition system (Savannah-100, Shijia Technology Co., Ltd.), when the reaction chamber vacuum reaches about 10 -2 When torr, the components of the atomic layer deposition system are heated, and the temperature of the reaction chamber is contro...

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Abstract

The invention provides a method for cladding surfaces of an active material of an anode and / or the anode and methods for manufacturing the anode and a battery. In the cladding method, an atomic layer deposition technology is adopted to deposit surface modification substances on the surfaces of the active material of the anode and / or the anode of a lithium battery. According to the invention, the cycle performance and the specific capacity of the lithium-ion battery can be improved obviously and electrode materials are more stable.

Description

Technical field [0001] The present invention relates to a method for surface coating a positive electrode active material and / or a positive electrode of a lithium battery and a preparation method of the positive electrode and a battery, and more specifically to a method for performing atomic absorption on the positive electrode active material and / or positive electrode surface of a lithium battery. A method for layer modification, a positive electrode preparation method and a battery preparation method including the modification method. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, digital cameras, notebook computers and other digital products and electric bicycles since their commercialization in the past 20 years, and they play an important role in people's daily lives. Due to its high power density, high energy density and high cycle capability, lithium batteries have become the most recognized battery of choice for electric vehicl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 冯国星钟开富李泓黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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