Preparation method of lithium iron phosphate/carbon nanotube microsphere positive electrode material, positive electrode material and optimization method of aqueous lithium ion capacitor

A carbon nanotube microsphere, lithium iron phosphate technology, applied in the field of electrochemical energy storage, can solve the problems of limited ion diffusion, easy agglomeration, etc., and achieve the effects of environmental friendliness, high capacity value, and excellent electrochemical performance.

Active Publication Date: 2021-03-05
HEILONGJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high price of graphene limits its applications, and its tendency to agglomerate also limits ion diffusion during charging and discharging.

Method used

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  • Preparation method of lithium iron phosphate/carbon nanotube microsphere positive electrode material, positive electrode material and optimization method of aqueous lithium ion capacitor
  • Preparation method of lithium iron phosphate/carbon nanotube microsphere positive electrode material, positive electrode material and optimization method of aqueous lithium ion capacitor
  • Preparation method of lithium iron phosphate/carbon nanotube microsphere positive electrode material, positive electrode material and optimization method of aqueous lithium ion capacitor

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Experimental program
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Effect test

Embodiment 1

[0044] Example 1 Preparation of lithium iron phosphate / carbon nanotube microsphere positive electrode material

[0045] (1) Preparation of carbon nanotube microspheres by template method:

[0046] 1) Preparation of hydroxylated polystyrene microspheres:

[0047] At a stirring speed of 300r / min, 200mL of deionized water, 100mL of styrene and 2mL of α-methacrylic acid were mixed, heated and condensed to reflux under stirring, and then 0.5g of potassium persulfate aqueous solution with a concentration of 5wt% was added as an initiator. After 2h reaction, the product was obtained. The product was centrifuged at 10,000 rpm for 20 minutes, the supernatant was discarded, the precipitate was washed with absolute ethanol, then with deionized water, and dried to obtain hydroxylated polystyrene microspheres;

[0048] 2) Preparation of acidified carbon nanotubes:

[0049] Place carbon nanotubes in mixed acid, ultrasonically treat for 30 minutes, and then react in an oil bath at 60°C at...

Embodiment 2

[0060] The preparation of embodiment 2 water-based lithium ion capacitors

[0061] 1. The preparation of lithium ion capacitor positive plate: get respectively 5mg, 10mg, 15mg lithium iron phosphate / carbon nanotube microsphere positive electrode material prepared in embodiment 1, add conductive agent carbon black and binder polytetrafluoroethylene solution, Mix evenly, coat on the front and back sides of the treated foam nickel, the coating area is 1cm×1cm, and then put it in an oven with a temperature of 60°C for 24h, and roll it into a 0.5mm thick Sheet form, leaving the coating material exposed on both sides;

[0062] The quality of the conductive agent carbon black is 10%, 20%, 30% and 40% of the total mass of the conductive agent carbon black and lithium iron phosphate / carbon nanotube microsphere positive electrode material, and the binder polytetrafluoroethylene solution is 4wt % polytetrafluoroethylene aqueous solution, the quality of polytetrafluoroethylene in the bin...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate / carbon nanotube microsphere positive electrode material, the positive electrode material and an optimization method of an aqueous lithium ion capacitor, and relates to the field of electrochemical energy storage, and the specific scheme is as follows: preparing carbon nanotube microspheres and a lithium iron phosphate precursor solution; carrying out negative-pressure vacuum infiltration on the carbon nanotube microspheres and a lithium iron phosphate precursor solution to obtain a precursor, carrying out drying and high-temperature carbonization treatment to obtain the lithium iron phosphate / carbon nanotube microsphere positive electrode material, and applying the lithium iron phosphate / carbon nanotube microsphere positive electrode material to an optimized aqueous lithium ion capacitor. The preparation method provided by the invention has the advantages of sufficient and cheap selected raw materials, environmental friendliness, high capacity value and stable crystal structure, the experiment cost is reduced, and the product does not pollute the environment. The obtained positive electrode material has a highspecific capacitance value. After the material is used for optimizing the capacitor, the obtained capacitor is good in rate capability and long in cycle life, and the comprehensive electrochemical performance of the capacitor is integrally improved.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a preparation method of positive electrode materials, a positive electrode material and an optimization method for high energy density and high power density aqueous lithium ion capacitors. Background technique [0002] In the field of electrochemical energy storage, electrochemical double-layer capacitors (EDLCs) and lithium-ion batteries (LIBs) are traditional energy storage devices. Lithium-ion capacitors (LICs) consist of two electrodes with two different energy storage mechanisms, one electrode is a LIBs-type electrode and the other is an EDLCs-type electrode. LICs have the advantages of both lithium-ion batteries and electrochemical double-layer capacitors, make up for the shortcomings of low power density and short cycle life of lithium-ion batteries, improve the status quo of low energy density of electrochemical double-layer capacitors, and meet the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/36H01G11/50H01G11/86
CPCH01G11/26H01G11/30H01G11/36H01G11/50H01G11/86Y02E60/13
Inventor 秦川丽吕世贤孙立国张朋雪向俊羽
Owner HEILONGJIANG UNIV
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