Lithium ion battery anode film, preparation and application thereof

A lithium-ion battery, cathode film technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage battery electrodes, etc., can solve the problems of reduced cycle efficiency and capacity attenuation of lithium-ion batteries

Inactive Publication Date: 2014-09-10
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

[0007] 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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  • Lithium ion battery anode film, preparation and application thereof
  • Lithium ion battery anode film, preparation and application thereof
  • Lithium ion battery anode film, preparation and application thereof

Examples

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preparation example Construction

[0075] 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:

[0076] (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

[0077] or

[0078] (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.

[0079] battery positive

[0080] The positive electrode of the ba...

Embodiment 1

[0090] Example 1 Preparation of Battery Positive Electrode 1

[0091] 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.

[0092] The mass of lithium peroxide added is 1% of the mass of the positive electrode material lithium iron phosphate, the mass ratio of the positive electrode material, acetylene black and binder is 85:10:5 respectively, and then coated and pressed on the aluminum foil to obtain the positive electrode of the battery 1.

Embodiment 2

[0093] Example 2 Preparation of lithium battery 2 (half battery)

[0094] 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

Provided is a positive electrode film of a lithium battery, comprising: (i) a positive electrode material of a lithium intercalated transition metallic oxide; (ii) a lithium ion replenisher; and (iii) a conductive agent and an adhesive. The lithium ion replenisher in the positive electrode film decomposes during initial charging and then releases lithium ions, so as to make up for a loss of lithium ions forming an SEI film on a negative electrode surface, thereby improving the reversible charging and discharging capacity of the lithium ion battery. In the prepared positive electrode film, the lithium ion replenisher can be mixed in the positive electrode material or the conductive agent in advance, and can be coated on the surface of the positive electrode of the lithium ion battery as well.

Description

technical field [0001] 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 [0002] 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 wind energy battery energy storage, satellites and aerospace, etc., so as to protect the environment , saving non-renewable energy and other aspects play an important role. [0003] So far, the positive electrode materials of lithium ions mainly include li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13
CPCH01M4/36H01M4/139H01M10/0525H01M10/4235H01M4/0447H01M4/1391H01M4/62H01M10/052Y02E60/10
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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