Preparation method of graphene-oxide-based MoO2 high-performance electrode material of lithium/sodium ion battery

A sodium-ion battery and graphene-based technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor intercalation/delithiation ability and influence on electrochemical performance, achieve short reaction time, easy control of product structure, The effect of high yield

Inactive Publication Date: 2015-04-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

But bulk MoO 2 The ability to intercalate / delithiate is poor, and only one lithium can be accommodated (theoretical capacity is 209mAh g -1 )[Auborn J J,Barberio Y L.Lithium intercalation cells without metallic lithium.J Electrochem Soc,1987,134:638–641], thus affecting its electrochemical performance

Method used

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  • Preparation method of graphene-oxide-based MoO2 high-performance electrode material of lithium/sodium ion battery
  • Preparation method of graphene-oxide-based MoO2 high-performance electrode material of lithium/sodium ion battery
  • Preparation method of graphene-oxide-based MoO2 high-performance electrode material of lithium/sodium ion battery

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Embodiment 1

[0025] A graphene oxide-based MoO 2 The preparation method of high-performance lithium / sodium ion battery electrode material comprises the following steps:

[0026] 1) Disperse graphene oxide in deionized water, where the mass ratio m(GO / H 2 O)=0.0042, fully stirred; then (NH 4 )Mo 7 o 24 4H 2 O is dissolved in deionized water, where the mass ratio m((NH 4 )Mo 7 o 24 / H 2 O)=0.2, fully stirred to form (NH 4 )Mo 7 o 24 aqueous solution; in GO / H 2 Add dropwise in O (NH 4 )Mo 7 o 24 aqueous solution, so that GO and (NH 4 )Mo 7 o 24 The mass ratio m(GO / (NH 4 )Mo 7 o 24 )=0.105, stir to make it dispersed;

[0027] 2) evaporate water to form molybdenum ammonium acid (derivative) / graphene oxide composite;

[0028] 3) Heat the composite in a tube furnace at 300 °C for 20 min to form MoO 2 / GO.

[0029] see figure 1 ,from figure 1 Available, MoO 2 / GO and MoO 2 Each diffraction peak of the particles is identical to that of MoO 2 The diffraction peaks of the...

Embodiment 2

[0040] A graphene oxide-based MoO 2 The preparation method of high-performance lithium / sodium ion battery electrode material comprises the following steps:

[0041] 1) Disperse graphene oxide in deionized water, where the mass ratio m(GO / H 2 O)=0.02, fully stirred; then (NH 4 )Mo 7 o 24 4H 2 O is dissolved in deionized water, where the mass ratio m((NH 4 )Mo 7 o 24 :H 2 O)=0.06, fully stirred to form (NH 4 )Mo 7 o 24 aqueous solution; in GO / H 2 Add dropwise in O (NH 4 )Mo 7 o 24 aqueous solution, so that GO and (NH 4 )Mo 7 o 24 The mass ratio of m(GO:(NH 4 )Mo 7 o 24 )=0.3, stir to disperse it;

[0042] 2) evaporate water to form molybdenum ammonium acid (derivative) / graphene oxide composite;

[0043] 3) The composite was heated in a tube furnace at 400 °C for 50 min to form MoO 2 / GO.

Embodiment 3

[0045] A graphene oxide-based MoO 2 The preparation method of high-performance lithium / sodium ion battery electrode material comprises the following steps:

[0046] 1) Disperse graphene oxide in deionized water, where the mass ratio m(GO / H 2 O)=0.0043, fully stirred; then (NH 4 )Mo 7 o 24 4H 2 O is dissolved in deionized water, where the mass ratio m((NH4 )Mo 7 o 24 :H 2 O)=0.089, fully stirred to form (NH 4 )Mo 7 o 24 aqueous solution; in GO / H 2 Add dropwise in O (NH 4 )Mo 7 o 24 aqueous solution, so that GO and (NH 4 )Mo 7 o 24 The mass ratio of m(GO:(NH 4 )Mo 7 o 24 )=0.098, stir to make it dispersed;

[0047] 2) evaporate water to form molybdenum ammonium acid (derivative) / graphene oxide composite;

[0048] 3) The composite was heated in a tube furnace at 450 °C for 55 min to form MoO 2 / GO.

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Abstract

The invention discloses a preparation method of a graphene-oxide-based MoO2 high-performance electrode material of a lithium / sodium ion battery and belongs to the technical field of preparation of the electrode material of the lithium / sodium ion battery. The technical scheme is as follows: the preparation method comprises the following steps: dropwise adding (NH4)Mo7O24 aqueous solution into a graphene-oxide water dispersing system, fully stirring, dispersing to be uniform, and then evaporating water in the dispersing system to form molybdenum amino acid and derivative / graphene-oxide layered preform; then carrying out heat treatment on the molybdenum amino acid and derivative / graphene-oxide layered preform, and thus preparing the graphene-oxide-based MoO2 high-performance electrode material of the lithium / sodium ion battery. The preparation method disclosed by the invention has the advantages that the operation is simple, the reaction time is short, the repeatability is high, the cost is lower, the yield is large, and the structure of a product is easily controlled; and the prepared negative material of the battery reaches the nano-scale size, and has the characteristics of large specific capacity, good conductivity, low resistivity and high circulating times and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium / sodium ion battery electrode materials, in particular to a graphene oxide-based MoO 2 Preparation method of high-performance lithium / sodium ion battery electrode material. Background technique [0002] Lithium-ion batteries have the advantages of high discharge voltage, small self-discharge, long cycle life, no pollution, and no memory effect. They have been widely used in consumer electronics, electric vehicles, and smart grids. On the other hand, due to the low price and abundant resources of sodium, sodium-ion batteries as a new energy material have also attracted extensive attention from researchers at home and abroad. [0003] As anode materials for lithium / sodium-ion batteries, nanoscale metal oxides such as Co 3 o 4 [Si Xiao, Jiarui Cui, Pengfei Yi, Ying Yang, Xueyi Guo, Insight into electrochemical properties of Co 3 o 4 -modified magnetic polymer electrolyte, [J] Elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587
CPCH01M4/362H01M4/483H01M4/587Y02E60/10
Inventor 许占位王天黄剑锋曹丽云惠亚妮李康高娇娇刘琳娜席乔刘欢
Owner SHAANXI UNIV OF SCI & TECH
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