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Preparation and Properties of Graphene/MnO2/Nanocellulose Flexible Electrode Material
Received:June 04, 2020  
DOI：10.11980/j.issn.0254-508X.2020.10.002
Key Words:nanocellulose  manganese dioxide  graphene  flexible electrode
Author NameAffiliationPostcode
LI Renkun School of Light Industry and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
WANG Xiwen School of Light Industry and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:The graphene/MnO2/nanocellulose flexible electrode material was prepared by vacuum filtration. The effects of different ratios of nanocellulose， graphene and MnO2，electrochemical scanning rates and current densities on the properties of the electrode material were investigated. The results showed that when the scanning rate was 10 mV/s， the specific capacitance of the flexible composite electrode material （m（nano-cellulose）∶m（graphene）∶m（MnO2）=3∶5∶2） was as high as 117.5 F/g. With the increase of the scanning rate， the specific capacitance decreased gradually， and when the scanning rate was 90 mV/s， the specific capacitance decreased to 40.4 F/g；When the current density was 0.5 A/g， the specific capacitance of the flexible composite electrode material （m（nanocellulose）： m （graphene）： m（MnO2）=3∶3∶4） could be as high as 112.5 F/g. With the increase of the current density， the specific capacitance of the composite electrode decreased gradually， when the current density was 1 A/g， the specific capacitance of the composite material decreased to 20.5 F/g；with the decrease of graphene content， the area resistance increased gradually. When graphene ratio was 50%， the area resistance was 15.60 Ω/□，When graphene was 30%， the area resistance increased to 47.20 Ω/□；the specific capacitance of the flexible composite electrode material （m（nano-cellulose）： m（graphene）： m（MnO2） = 3∶3∶4） after one charge and discharge， the specific capacitance was 112.5 F/g， and after 100 cycles， the specific capacitance was 90.9 F/g， decreased by 19.2%， the composite electrode materials showed the good charge-discharge and cycle performance. Nanocellulose greatly affects the mechanical properties of flexible electrode materials. When the mass ratio of nanocellulose and graphene was 5∶5， the elastic modulus of graphene/nanocellulose flexible electrode materials reached the maximum value of 2184 MPa.
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