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Cathode film of lithium ion battery, preparation of the same, and application of the same

A lithium-ion battery and positive electrode film technology, applied in the field of lithium-ion battery positive electrode film and its preparation and application, can solve the problems of lithium-ion battery capacity attenuation, cycle efficiency reduction, etc.

Inactive Publication Date: 2019-04-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of capacity fading and cycle efficiency reduction of the above-mentioned lithium ion battery, the object of the present invention is to provide a lithium ion battery positive electrode film containing a lithium ion supplement and a corresponding battery

Method used

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  • Cathode film of lithium ion battery, preparation of the same, and application of the same
  • Cathode film of lithium ion battery, preparation of the same, and application of the same
  • Cathode film of lithium ion battery, preparation of the same, and application of the same

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preparation example Construction

[0076] The method for preparing the positive electrode film of the lithium battery of the present invention can mix the lithium ion supplement into the positive electrode material or slurry of the lithium battery and / or apply it on the positive electrode of the battery after the positive electrode of the conventional lithium battery is prepared. Specifically, the commonly used preparation methods include the following three:

[0077] (a1) provide a positive electrode material slurry, the slurry contains lithium intercalation transition metal oxide positive electrode material, lithium ion supplement, and conductive agent and binding agent; A positive electrode film is made by drying; or

[0078] or

[0079] (a3) Coating the lithium ion supplement on the surface of the dried lithium ion battery positive electrode, thereby forming a lithium battery positive electrode film containing the lithium ion supplement.

[0080] battery positive

[0081] The positive electrode of the ba...

Embodiment 1

[0091] Example 1 Preparation of Battery Positive Electrode 1

[0092] Lithium iron phosphate, a commercial lithium-ion battery anode material, is uniformly mixed with lithium ion supplement lithium peroxide, conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) in a nitrogen-methylpyrrolidone (NMP) solution.

[0093] The mass of lithium peroxide added is 1% of the mass of the positive electrode material lithium iron phosphate, and the mass ratios of the positive electrode material, acetylene black and binder are respectively 85:10:5, and then coated and pressed on the aluminum foil to obtain the positive electrode of the battery 1.

Embodiment 2

[0094] The preparation of embodiment 2 lithium battery 2 (half cell)

[0095] The positive electrode 1 of the battery is assembled into a CR2032 button lithium battery 2 with a metal lithium sheet as the positive electrode, a solution of ethylene carbonate and dimethyl carbonate of 1mol / L lithium hexafluorophosphate as the electrolyte, and polyethylene with a thickness of 20 microns as the diaphragm.

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Abstract

The invention discloses a cathode film of a lithium ion battery. The cathode film includes (i) lithium-intercalated transition metal oxide cathode material; (ii) lithium ion supplement; and (iii) conductive agent and binder. The lithium ion supplement in the cathode film decomposes during the first charging, and then releases lithium ions, so as to compensate for loss of the lithium ions forming an SEI film on the surface of the anode surface, thereby improving the reversible charge and discharge capacity of the lithium ion battery. For preparing the cathode film, the lithium ion supplement can be mixed in advance in the cathode material or the conductive agent, and can also be coated on the cathode surface of the lithium ion battery, so that the cathode film has the advantages of convenient use, low cost, good compatibility with various lithium ion battery systems, and improvement of electrochemical performance on the battery.

Description

[0001] This application is a divisional application of the invention application filed on March 5, 2013, with the title of "A Lithium-ion Battery Positive Electrode Film and Its Preparation and Application" and the application number of 201310070202.9. technical field [0002] The invention belongs to the field of lithium ion batteries. Specifically, the present invention relates to a lithium-ion battery cathode film and its preparation and application. Background technique [0003] Since the commercialization of lithium-ion batteries in the early 1980s, they have been widely used in portable electronic devices such as mobile phones, notebook computers, and small cameras because of their high voltage, high specific energy, long cycle life, and no environmental pollution. ; Lithium-ion batteries can also replace traditional non-renewable resources such as oil and natural gas, and are more widely used in electric tools, electric bicycles, electric vehicles, solar cells and win...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/62H01M4/04H01M4/1391H01M10/0525
CPCH01M4/139H01M10/0525H01M10/4235H01M4/0447H01M4/1391H01M4/62H01M10/052Y02E60/10
Inventor 王辰云刘现军刘杨方燕群王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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