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Rapidly charged flexible lithium ion battery and preparation method of electrodes of rapidly charged flexible lithium ion battery

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 bendability, achieve mass production, improve rate performance, The effect of low product cost

Inactive Publication Date: 2014-03-26
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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  • Rapidly charged flexible lithium ion battery and preparation method of electrodes of rapidly charged flexible lithium ion battery
  • Rapidly charged flexible lithium ion battery and preparation method of electrodes of rapidly charged flexible lithium ion battery
  • Rapidly charged flexible lithium ion battery and preparation method of electrodes of rapidly charged flexible lithium ion battery

Examples

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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 rapidly charged flexible lithium ion battery and a preparation method of electrodes of the rapidly charged flexible lithium ion battery, belonging to the technical field of lithium ion batteries. The electrodes of the lithium ion battery are integrally designed by a current collector and active substances. An ultralight and flexible three-dimensional graphene communicating network structure (short for graphene foams) is used as a current collector, the active substances are embedded on the surface of the three-dimensional graphene foams, the integrated active substances and the current collector can be obtained through hydrothermal, pulp filling and impregnation processes, and the content of the active substances can be regulated as required. The electrodes of the battery are not required for a metal current collector, a binder and a conductive agent, the ultrahigh conductivity and porous structure of the three-dimensional graphene network provide rapid diffusion channels for lithium ions and electrons. The lithium ion battery consisting of a positive electrode and a negative electrode can be rapidly charged, is bendable and has no capacity loss. The method disclosed by the invention is low in product production cost, ultralight and ultrathin, and capable of realizing large-batch production, and has high practical application values.

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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IPC IPC(8): H01M4/66H01M4/583H01M2/08H01M10/0525H01M4/1393H01M50/193H01M50/198
CPCY02E60/122H01M4/136H01M4/1391H01M4/505H01M4/525H01M4/5825H01M4/663H01M10/0525Y02E60/10
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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