Reduced graphene oxide loaded antimony sodium-ion battery negative electrode material and preparation method thereof

A technology of sodium ion battery and negative electrode material, applied in the field of electrochemical energy storage, can solve the problems of battery capacity decay, easy pulverization of electrode materials, poor cycle performance, etc., and achieve the effects of excellent cycle rate performance, simple method and low cost

Active Publication Date: 2019-03-15
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the volume change of the antimony-based negative electrode material of the sodium ion battery in the prior art during the removal/intercalation of sodium, the electrode material is easy to pulverize after repeated charge and discharge, resulting in battery capacity attenuation and poor cycle performance. The present invention provides a reduction oxidation Graphene-loaded antimony sodium ion battery negative electrode material

Method used

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  • Reduced graphene oxide loaded antimony sodium-ion battery negative electrode material and preparation method thereof
  • Reduced graphene oxide loaded antimony sodium-ion battery negative electrode material and preparation method thereof
  • Reduced graphene oxide loaded antimony sodium-ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0029] The preparation method of the sodium ion battery negative electrode material of reduced graphene oxide loaded with antimony:

[0030] Step 1: Preparation of graphene oxide.

[0031] Step 101. Weigh 10g flake graphite and 7.5g NaNO 3 In the beaker, slowly add 300ml of concentrated sulfuric acid (98%), and magnetically stir until uniform; slowly add 40g of potassium permanganate under magnetic stirring, and continue to stir for 96 hours to obtain a black gelatinous substance.

[0032]Step 102. Add 800ml of deionized water and 60ml of hydrogen peroxide (30%) to the black colloidal substance in turn, stir until uniform, and obtain a yellow solution; centrifuge the obtained yellow solution at 6000rpm at a high speed for 5 minutes to obtain a high-speed centrifuge Product; further preferably, the high-speed centrifugation process is repeated 3 to 5 times, and the high-speed centrifugation product is taken after washing with water until the supernatant is neutral.

[0033] S...

Embodiment 2

[0043] Preparation method of reduced graphene oxide loaded antimony negative electrode material:

[0044] Step 1: with embodiment 1.

[0045] Step 2: Weigh 2g of antimony trichloride in a glass bottle, add 10ml of ethanol dropwise, and obtain 10ml of 0.8M colorless and clear antimony trichloride ethanol solution after ultrasonication for 0.5h; Graphene oxide was dispersed in 40ml ethanol solution by ultrasound for 1h to obtain a dark brown solution; 0.18ml of ammonia water (25%) was added dropwise to the graphene oxide ethanol solution, and magnetically stirred for 3h; ml colorless and clear solution, connect the syringe to the extension tube, exhaust and check that there are no bubbles, fix it on the syringe pump fixing plug, start the syringe pump, add the colorless and clear solution dropwise at a flow rate of 0.1mL / min, and continue to stir for 12h. Obtain a dark gray solution; centrifuge the dark gray solution at 8500rpm for 8min and dry the precipitate at 80°C for 10h t...

Embodiment 3

[0050] Step 1: Graphene oxide preparation:

[0051] Take 8g of flake graphite and weigh NaNO according to the mass ratio of 4:3 3 , the two are mixed in a beaker, and slowly add 200ml of concentrated sulfuric acid (mass percentage concentration is 98%) in the beaker, and magnetically stir until uniform;

[0052] Slowly add 30g potassium permanganate under magnetic stirring condition, and continue to stir for 96 hours, obtain black colloidal substance; In black colloidal substance, add 800ml deionized water and 70ml hydrogen peroxide (the mass percent concentration of hydrogen peroxide is 30%) successively, Stir until uniform to obtain a yellow solution;

[0053] Centrifuge the obtained yellow solution at high speed, and wash with water until the supernatant is neutral; add the high-speed centrifuged product to deionized water again and stir evenly, after ultrasonic treatment, place it in a centrifuge, centrifuge at low speed, and collect the gray-brown viscous liquid in the u...

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Abstract

The invention discloses a reduced graphene oxide loaded antimony sodium-ion battery negative electrode material and a preparation method thereof, and relates to the technical field of electrochemicalenergy storage. Antimony trichloride, ammonia water and flake graphite are used as raw materials, graphene oxide is prepared by using a chemical oxidation method and a stripping method, antimony precursor particles are loaded on a graphene oxide sheet layer by an improved liquid-phase synthesis method, and finally thermal reduction treatment is carried out to obtain the reduced graphene oxide loaded antimony sodium-ion battery negative electrode material. The reduced graphene oxide loaded antimony sodium-ion battery negative electrode material has excellent circulation ratio performance; aftercirculation at the high current density of 2A g<-1> for 100 circles, Sb-rGO can still keep the capacity of more than 140mAh g<-1>, and the coulombic efficiency is maintained above 97%; the preparation method provided by the invention does not need to add a surfactant and a reducing agent, the method is simple, the cost is low, and the negative electrode material is suitable for large-scale preparation.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, and mainly relates to a sodium ion battery negative electrode material with antimony supported on reduced graphene oxide and a preparation method thereof. Background technique [0002] With the depletion of fossil energy such as petroleum, coal, and natural gas, and the increasing environmental problems caused by the excessive application of fossil energy, the rapid development of science, technology and economic construction has an imminent demand for renewable and clean energy. Energy storage technology, especially for electric energy storage technology, is particularly important in solving the problem of energy crisis. Recyclable charge-discharge lithium-ion has higher energy density and power density than traditional chemical batteries, and has excellent properties such as slow self-discharge rate and high working voltage. However, lithium resources are unevenly distri...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/134
CPCH01M4/134H01M4/38H01M4/625Y02E60/10
Inventor 毕晓昉钟志鹏李进
Owner BEIHANG UNIV
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