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Application of reduced graphene oxide-TiO2-Cr2O3 composite material in sodium-ion battery

A technology of -tio2-cr2o3, composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor conductivity, achieve significant progress, highlight substantive features, and excellent charge-discharge cycle performance

Inactive Publication Date: 2016-06-22
陈波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 Poor conductivity, conductive materials must be introduced to improve their cycle and rate performance in Na-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Reduced graphene oxide-TiO 2 -Cr 2 O 3 Preparation of composite materials

[0019] Step S1, weigh 0.5g of graphene oxide in a 100mL beaker, add 50mL of deionized water to dissolve, stir magnetically at room temperature for 30min, then put the beaker into an ultrasonic instrument and sonicate twice, each time for 30min, to prepare graphene oxide aqueous solution;

[0020] Step S2, weigh 4gTiO 2 and potassium dichromate in a 300mL beaker, add 100mL of deionized water to dissolve, and ultrasonically disperse for 30min to prepare TiO 2 and potassium dichromate aqueous solution; TiO 2 The ratio by weight with potassium dichromate is 6:1;

[0021] Step S3, the graphene oxide aqueous solution is added dropwise to the TiO 2 and potassium dichromate aqueous solution, after ultrasonically dispersing the prepared suspension for 30min, the method of spray drying was used to prepare graphene oxide-TiO 2 -Cr 2 o 3 black powder;

[0022] Step S4, the g...

Embodiment 2

[0023] Example 2: Reduced graphene oxide-TiO 2 -Cr 2 O 3 Preparation of composite materials

[0024] Step S1, weigh 0.5g of graphene oxide in a 100mL beaker, add 50mL of deionized water to dissolve, stir magnetically at room temperature for 30min, then put the beaker into an ultrasonic instrument and sonicate twice, each time for 30min, to prepare graphene oxide aqueous solution;

[0025] Step S2, weigh 4gTiO 2 and potassium dichromate in a 300mL beaker, add 100mL of deionized water to dissolve, and ultrasonically disperse for 30min to prepare TiO 2 and potassium dichromate aqueous solution; TiO 2 The ratio of parts by weight with potassium dichromate is 5:1;

[0026] Step S3, the graphene oxide aqueous solution is added dropwise to the TiO 2 and potassium dichromate aqueous solution, after ultrasonically dispersing the prepared suspension for 30min, the method of spray drying was used to prepare graphene oxide-TiO 2 -Cr 2 o 3 black powder;

[0027] Step...

Embodiment 3

[0028] Example 3: Reduced graphene oxide-TiO 2 -Cr 2 O 3 Preparation of composite materials

[0029] Step S1, weigh 0.5g of graphene oxide in a 100mL beaker, add 50mL of deionized water to dissolve, stir magnetically at room temperature for 30min, then put the beaker into an ultrasonic instrument and sonicate twice, each time for 30min, to prepare graphene oxide aqueous solution;

[0030] Step S2, weigh 4gTiO 2 and potassium dichromate in a 300mL beaker, add 100mL of deionized water to dissolve, and ultrasonically disperse for 30min to prepare TiO 2 and potassium dichromate aqueous solution; TiO 2 The ratio by weight with potassium dichromate is 7:1;

[0031] Step S3, the graphene oxide aqueous solution is added dropwise to the TiO 2 and potassium dichromate aqueous solution, after ultrasonically dispersing the prepared suspension for 30min, the method of spray drying was used to prepare graphene oxide-TiO 2 -Cr 2 o 3 black powder;

[0032] Step S4, the gr...

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PUM

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Abstract

The invention discloses an application of a reduced graphene oxide-TiO2-Cr2O3 composite material in a sodium-ion battery. The composite material is excellent in cycling stability, and can still keep relatively high reversible capacity after 350 cycles; and the capacity retention ratio is about 95% and can reach 98% at most. Thus it can be seen that the reduced graphene oxide-TiO2-Cr2O3 composite material has excellent charge-discharge cycle performance; the performance can be concerned with the ratio of parts by weight of TiO2 to potassium dichromate in the preparation method; and when the ratio of parts by weight of TiO2 to potassium dichromate is (5-7) to 1, the charge-discharge cycle performance is the most outstanding. Compared with the prior art, the reduced graphene oxide-TiO2-Cr2O3 composite material has outstanding substantial characteristics and significant progress.

Description

technical field [0001] The invention belongs to the field of energy and relates to graphene battery materials, in particular to a reduced graphene oxide-TiO 2 -Cr 2 o 3 Application of composite materials in sodium-ion batteries. Background technique [0002] The development of clean energy is an inevitable trend for the sustainable development of human society, and advanced energy storage technology is the key to the application of clean energy. Electrochemical energy storage has become the primary development technology due to its advantages of high efficiency and easy maintenance. Lithium-ion batteries are currently the most advanced secondary battery technology, featuring high energy density, long cycle life, and high operating voltage. In addition to being widely used in portable electronic devices, lithium-ion batteries are also used as the preferred power source for electric vehicles and energy storage power stations. But with With the continuous expansion of the a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/054
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/362H01M4/483H01M4/583H01M10/054Y02E60/10
Inventor 陈波
Owner 陈波