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Lithium ion supercapacitor with positive electrode pre-embedded with lithium

A supercapacitor and pre-intercalated lithium technology, which is applied in the field of lithium-ion batteries, can solve the problems of difficult lithium-ion batteries, such as positive active materials and poor battery rate characteristics, to achieve improved rate cycle performance, high pseudocapacitance, and improved stability and the effect of conductivity

Active Publication Date: 2021-08-10
CHANGZHOU VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the technical problem to be solved in the present invention is: when lithium iron phosphate is used as the positive electrode active material of the lithium ion battery, the rate characteristic of the battery is poor, and it is difficult to be directly used as the positive electrode active material of the lithium ion battery

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Effect test

Embodiment 1

[0078] The positive electrode active material of the lithium-ion supercapacitor with the positive electrode pre-intercalated lithium is prepared according to the following steps:

[0079] (1) 150mg graphene oxide is dispersed in deionized water to obtain a dispersion of 5mg / mL;

[0080] (2) Add 1.5g spherical lithium iron phosphate precursor, 5mg Fe(NO 3 ) 3 9H 2 O, 15mg cobalt nitrate hexahydrate, 20mg thiourea, after stirring evenly, add 2mL formaldehyde, after stirring evenly, then add 650mg urea, stir until viscous resin;

[0081] (3) Place the above-mentioned viscous resinous mixture in a hydrothermal high-pressure reactor, and heat it under water for 8 hours at 120°C. After the reaction, freeze-dry the reaction product to obtain a loose and porous composite material;

[0082] (4) Calcining the composite material obtained in step (3) under an argon atmosphere at a calcination temperature of 700° C. and a calcination time of 2 h to obtain a positive electrode active mat...

Embodiment 2

[0084] The positive electrode active material of the lithium-ion supercapacitor with the positive electrode pre-intercalated lithium is prepared according to the following steps:

[0085] (1) 150mg graphene oxide is dispersed in deionized water to obtain a dispersion of 5mg / mL;

[0086] (2) Add 3g spherical lithium iron phosphate precursor, 5mg Fe(NO 3 ) 3 9H 2 O, 15mg cobalt nitrate hexahydrate, 20mg thiourea, after stirring evenly, add 2mL formaldehyde, after stirring evenly, then add 750mg melamine, stir until viscous resin;

[0087] (3) Place the above-mentioned viscous resinous mixture in a hydrothermal autoclave, heat at 120°C for 24 hours, and after the reaction, freeze-dry the reaction product to obtain a loose and porous composite material;

[0088] (4) Calcining the composite material obtained in step (3) under an argon atmosphere at a calcination temperature of 700-800° C. and a calcination time of 3 hours to obtain a positive electrode active material.

Embodiment 3

[0090] The positive electrode active material of the lithium-ion supercapacitor with the positive electrode pre-intercalated lithium is prepared according to the following steps:

[0091] (1) 150mg graphene oxide is dispersed in deionized water to obtain a dispersion of 5mg / mL;

[0092] (2) Add 2g spherical lithium iron phosphate precursor, 5mg Fe(NO 3 ) 3 9H 2 O, 15mg cobalt nitrate hexahydrate, 20mg thiourea, after stirring evenly, add 2mL formaldehyde, after stirring evenly, then add 700mg melamine, stir until viscous resin;

[0093] (3) Place the above-mentioned viscous resinous mixture in a hydrothermal high-pressure reactor, and heat it under water for 12 hours at 120°C. After the reaction, freeze-dry the reaction product to obtain a loose and porous composite material;

[0094] (4) Calcining the composite material obtained in step (3) under an argon atmosphere, the calcination temperature is 750° C., and the calcination time is 2.5 h, to obtain the positive electrode...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a lithium ion supercapacitor with a positive electrode pre-embedded with lithium. Lithium iron phosphate with an orthorhombic system olivine-type structure is one of positive electrode materials of lithium ion batteries and capacitors which are most widely applied in the current market, and the application of the lithium iron phosphate is greatly limited due to the problems of low electronic conductivity and poor ion diffusion rate. Based on the problem, the invention provides a lithium ion supercapacitor with a positive electrode pre-embedded with lithium, wherein the positive electrode material is a composite material obtained by compounding a spherical lithium iron phosphate material and heteroatom-doped graphene, and the outer side of the composite material is wrapped by a network carbon structure formed by carbonizing melamino-formaldehyde resin, so that the cycling stability and the rate capability of the lithium ion battery are effectively improved, and a relatively good application prospect is achieved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion supercapacitor with a positive electrode pre-intercalated with lithium. Background technique [0002] Lithium-ion capacitor is an electrochemical energy storage lithium-ion capacitor between batteries and supercapacitors. It has high power density and energy density, and its cycle life exceeds 100,000 times. It is an ideal chemical power source. Pulse lithium-ion capacitors, wind energy storage and hybrid electric vehicles have incomparable advantages in many fields. [0003] 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/86
CPCH01G11/50H01G11/86Y02E60/13
Inventor 高琳琳衡星月周闯程舒扬刘咏琪佟天赐杨怡刘巧云
Owner CHANGZHOU VOCATIONAL INST OF ENG
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