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Polycaprolactam-coated CoFe2O4 loaded porous carbon negative electrode material and preparation method thereof

A technology of polycaprolactam and negative electrode materials, applied in the preparation/purification of carbon, negative electrodes, battery electrodes, etc., can solve the problems of low conductivity and poor cycle stability of negative electrode materials, and achieve enhanced electrochemical activity and high porosity , The effect of enhancing the magnification performance

Inactive Publication Date: 2020-02-25
侯丁茜
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a polycaprolactam-coated CoFe 2 o 4 The negative electrode material loaded with porous carbon and its preparation method solve the problems of low conductivity, poor cycle stability, low specific capacitance and pseudocapacitance of lithium ion battery negative electrode materials

Method used

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  • Polycaprolactam-coated CoFe2O4 loaded porous carbon negative electrode material and preparation method thereof
  • Polycaprolactam-coated CoFe2O4 loaded porous carbon negative electrode material and preparation method thereof
  • Polycaprolactam-coated CoFe2O4 loaded porous carbon negative electrode material and preparation method thereof

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preparation example Construction

[0024] Polycaprolactam coated CoFe 2 o 4 The hollow microsphere preparation method comprises the following steps:

[0025] (1) Add appropriate amount of ethylene glycol and distilled water to the reaction flask, the volume ratio of the two is 2-3:1, and add Co(NO 3 ) 2 , 1,1'-ferrocenedicarboxylic acid and caprolactam, the molar ratio of the three substances is 1-1.2:1:3-5, transfer the solution into a hydrothermal automatic reaction kettle, and heat to 220-230 ℃ , stirring at a constant speed for 25-30 h.

[0026] (2) Cool the solution to room temperature, remove the upper solution by centrifugation through a high-speed centrifuge, wash the solid product with an appropriate amount of distilled water and absolute ethanol in sequence, and heat it to 70-80 ℃ in a blower dryer to fully dry , to prepare Co-Fe coordination polymer coated with polycaprolactam.

[0027] (3) Place the polycaprolactam-coated Co-Fe coordination polymer in a resistance furnace at a heating rate of 5...

Embodiment 1

[0034] (1) Preparation of polycaprolactam-coated Co-Fe coordination polymer 1: Add appropriate amount of ethylene glycol and distilled water to the reaction flask, the volume ratio of the two is 2:1, and add Co(NO 3 ) 2 , 1,1'-ferrocenedicarboxylic acid and caprolactam, the molar ratio of the three substances is 1:1:3, the solution is transferred into a hydrothermal automatic reaction kettle, heated to 220 ℃, and stirred at a constant speed for 25 h , the solution was cooled to room temperature, and the upper layer solution was removed by centrifugation through a high-speed centrifuge, and the solid product was washed with an appropriate amount of distilled water and absolute ethanol in sequence, and placed in a blast dryer and heated to 70 ° C to fully dry to prepare the poly Caprolactam coated Co-Fe coordination polymer 1.

[0035] (2) Preparation of polycaprolactam-coated CoFe 2 o 4 Hollow microsphere component 1: Preparation Put polycaprolactam-coated Co-Fe coordination...

Embodiment 2

[0040] (1) Preparation of polycaprolactam-coated Co-Fe coordination polymer 2: add appropriate amount of ethylene glycol and distilled water to the reaction flask, the volume ratio of the two is 2:1, add Co(NO 3 ) 2 , 1,1'-ferrocenedicarboxylic acid and caprolactam, the molar ratio of the three substances is 1:1:5, the solution is transferred into a hydrothermal automatic reaction kettle, heated to 220 ℃, and stirred at a constant speed for 30 h , the solution was cooled to room temperature, and the upper layer solution was removed by centrifugation through a high-speed centrifuge, and the solid product was washed with an appropriate amount of distilled water and absolute ethanol in sequence, and placed in a blast dryer and heated to 80 ° C to fully dry to prepare the poly Co-Fe coordination polymer 2 coated with caprolactam.

[0041] (2) Preparation of polycaprolactam-coated CoFe 2 o 4 Hollow microsphere component 2: Preparation Place polycaprolactam-coated Co-Fe coordinat...

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Abstract

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a polycaprolactam-coated CoFe2O4 loaded porous carbon negative electrode material and apreparation method thereof. The polycaprolactam-coated CoFe2O4 loaded porous carbon negative electrode material comprises the following formula raw materials: polycaprolactam-coated CoFe2O4 hollow microspheres, terephthalic aldehyde, ethylenediamine, triethylene tetramine and methyl acrylate. According to the polycaprolactam-coated CoFe2O4 loaded porous carbon negative electrode material and the preparation method thereof disclosed in the invention, the polycaprolactam limits the growth of the Co-Fe coordination polymer, calcining is conducted to form nanometer CoFe2O4 hollow microspheres, thetransmission distance of Li<+> between the electrolytic tank and the negative electrode material is shortened, the polarization effect of the negative electrode material is reduced, the polyamide-amido hyperbranched polymer has a three-dimensional dendritic branched structure, N-doped porous carbon is formed through calcination, an ultra-large specific surface and a rich pore structure are achieved, the CoFe2O4 hollow microspheres are uniformly dispersed and attached, the N-doped porous carbon has good conductivity, the interface resistance of the negative electrode material is reduced, and the transmission rate of Li<+> and charges is increased.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a polycaprolactam-coated CoFe 2 o 4 Negative electrode material loaded with porous carbon and its preparation method. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which mainly works by moving lithium ions between the positive electrode and the negative electrode. When charging, the lithium ions are deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; when discharging, the lithium ions Deintercalation from the negative electrode, embedding the positive electrode through the electrolyte, and the positive electrode is in a lithium-rich state. Lithium-ion batteries have the advantages of high voltage, large specific capacity, long cycle life, good safety performance, small self-discharge, and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525C01B32/05C01G51/00
CPCC01B32/05C01G51/00C01P2006/40H01M4/366H01M4/525H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 侯丁茜
Owner 侯丁茜
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