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A kind of fast charging flexible lithium ion battery and preparation method of electrode thereof

A lithium-ion battery, flexible technology, applied in the direction of battery electrodes, secondary batteries, battery pack components, etc., can solve problems such as difficult to achieve flexible characteristics such as bendable, achieve mass production, improve rate performance, Reduce the effect of volume changes

Inactive Publication Date: 2016-08-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design is still based on the traditional battery design. Although a fast-chargeable lithium-ion battery has been obtained, the battery still needs a coating process to coat the active material on the surface of the metal current collector as an electrode, so it is difficult to achieve flexible properties such as bendability.

Method used

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  • A kind of fast charging flexible lithium ion battery and preparation method of electrode thereof
  • A kind of fast charging flexible lithium ion battery and preparation method of electrode thereof
  • A kind of fast charging flexible lithium ion battery and preparation method of electrode thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Lithium titanate / graphene foam electrode preparation: 1ml tetraisopropyl titanate was added to the LiOH solution with a molar concentration of 0.4M, and the graphene foam (1×1cm 2 , with a thickness of 100 μm) into the above solution, placed in an 80ml polytetrafluoroethylene reactor, and reacted at 130°C for 12 hours. Take out the obtained titanate / graphene foam electrode and calcinate at 550°C for 6 hours under an inert atmosphere to obtain a lithium titanate / graphene foam electrode; during the hydrothermal process, the wrinkles and defects on the graphite foam preferentially become titanate The nucleation site of the final nanosheet-like titanate grows uniformly on the surface of the foamed graphene.

[0047] In the lithium titanate / graphene foam electrode of this embodiment, the proportion of graphene is 12wt%, and the rest is lithium titanate.

[0048] figure 2 Optical photographs of lithium titanate / graphene electrode foams from figure 2 It can be seen that t...

Embodiment 2

[0053] Preparation of lithium iron phosphate / graphene foam electrode: 0.01mol of CH 3 COOLi. 2 h 2 O, Fe(NO 3 ) 3 .9H 2 O and NH 4 h 2 PO was added to 35ml of water respectively, 2.5ml of organic reducing agent ethylene glycol and 2.5ml of isopropanol were added and stirred for 0.5 hours. The graphene foam (1×1cm 2 , with a thickness of 100 μm) into the above solution, placed in an 80ml polytetrafluoroethylene reactor, and reacted at 180°C for 6 hours. The obtained phosphate / graphene foam electrode was taken out, and calcined at 720° C. for 12 hours under an inert atmosphere to obtain a lithium ferrous phosphate / graphene foam electrode;

[0054] In the lithium iron phosphate / graphene foam electrode of this embodiment, the proportion of graphene is 12wt%, and the rest is lithium iron phosphate.

[0055] image 3 Scan the photo for the lithium iron phosphate / graphene foam electrode. From the picture, we can see that the lithium iron phosphate particles grow on the surf...

Embodiment 3

[0057] The difference from Example 1 is that in order to increase the loading capacity of the electrode active material, a lithium titanate / graphene foam electrode is prepared by using a perfusion method.

[0058] The preparation method of lithium titanate / graphene foam electrode: Grind commercial lithium titanate particles and conductive carbon black evenly according to the mass ratio of 9:1, add N-methylpyrrolidone (the mass ratio to lithium titanate particles is 1: 1) Grind evenly to make a slurry, drop the above slurry into the graphene foam, and dry at 120°C;

[0059] In the lithium titanate / graphene foam electrode of this embodiment, the proportion of graphene foam is ~2wt%, and the rest is lithium titanate.

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Abstract

The invention discloses a fast-charging flexible lithium-ion battery and an electrode preparation method thereof, belonging to the technical field of lithium-ion batteries. The electrode of the lithium-ion battery adopts an integrated design of a current collector and an active material. The ultra-light and flexible three-dimensional graphene interconnected network structure (referred to as graphene foam) is used as the current collector, and the active material is embedded on the surface of the three-dimensional graphene foam. The integrated active material and Current collector, and the content of active substances can be adjusted as needed. This battery electrode does not require metal current collectors, binders, and conductive agents. The ultra-high conductivity and porous structure of the three-dimensional graphene network provide rapid diffusion channels for lithium ions and electrons. A lithium-ion battery is assembled by using the above-mentioned positive and negative electrodes, which can realize fast charging, and can be bent without loss of capacity. The method of the invention produces products with low cost, ultra-light and ultra-thin, can realize mass production, and has high practical application value.

Description

technical field [0001] The invention relates to a fast-charging flexible lithium-ion battery and a method for preparing an electrode thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the increasingly prominent global energy problems, it is very urgent for countries to develop a new generation of clean energy. Lithium-ion battery is an internationally recognized ideal chemical energy source. It has the advantages of small size, large capacity, and high voltage. It is widely used in mobile phones, laptop computers and other electronic products. The growing field of electric vehicles will also bring lithium-ion batteries Come to more room for development. In recent years, research on flexible / foldable electronic devices, one of the most promising next-generation devices, has attracted much attention, and portable mobile electronic products are also developing in the direction of "bendable", which is actually an ultra-thin an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/583H01M2/08H01M10/0525H01M4/1393H01M50/193H01M50/198
CPCH01M4/136H01M4/1391H01M4/505H01M4/525H01M4/5825H01M4/663H01M10/0525Y02E60/10
Inventor 成会明李娜陈宗平李峰任文才
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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