TY - JOUR
T1 - Lithium-ion battery anode with high capacity retention derived from zinc vanadate and holey graphene
AU - Khan, Asim
AU - Ali, Basit
AU - Inayat, Abid
AU - Khan, Mohammad Rizwan
AU - Ahmad, Naushad
AU - Akbar, Jehan
AU - Ata-ur-Rehman,
AU - Nam, Kyung Wan
AU - Abbas, Syed Mustansar
N1 - Publisher Copyright:
© 2022 John Wiley & Sons Ltd.
PY - 2022/6/25
Y1 - 2022/6/25
N2 - Several phases of zinc vanadates having different morphologies have been investigated recently for lithium-ion batteries (LIBs), where they suffer from poor electronic conductivity and low mechanical stability resulting in short cycle life, low specific capacity and unsatisfactory rate performance. The issues are resolved here, by directly growing Zn3V2O8 sheets on two dimensional (2D) holey graphene oxide (hGO) nanosheets making an open framework of Zn3V2O8 that allows suitable spacing for Li+-ions for (de) intercalation and the holey graphene provides the necessary mechanical strength, permeability and electronic conductivity across the Zn3V2O8 sheets. Consequently, the sheet on sheet morphology has resulted in an impressive rate capability of 851.2 mAh g−1 at 5000 mA g−1 with 67% retention after a 10-fold increase in the current rate, high specific capacity (1465.9 mAh g−1 at 200 mA g−1) and long-term stability (88% retention after 200 cycles). This is due to the crystalline structure of Zn3V2O8/hGO, with a large surface area that can provide more reaction sites and facilitate the fast Li+-ion transport as verified by the electrochemical impedance spectroscopy analysis. The ex situ X-ray photoelectron spectrometer reveals the involvement of multiple reaction mechanisms (conversion, (de) insertion and (de) alloying) showing Zn2+/Zn0 and V4+/V3+/V2+ redox couples during the electrochemical process.
AB - Several phases of zinc vanadates having different morphologies have been investigated recently for lithium-ion batteries (LIBs), where they suffer from poor electronic conductivity and low mechanical stability resulting in short cycle life, low specific capacity and unsatisfactory rate performance. The issues are resolved here, by directly growing Zn3V2O8 sheets on two dimensional (2D) holey graphene oxide (hGO) nanosheets making an open framework of Zn3V2O8 that allows suitable spacing for Li+-ions for (de) intercalation and the holey graphene provides the necessary mechanical strength, permeability and electronic conductivity across the Zn3V2O8 sheets. Consequently, the sheet on sheet morphology has resulted in an impressive rate capability of 851.2 mAh g−1 at 5000 mA g−1 with 67% retention after a 10-fold increase in the current rate, high specific capacity (1465.9 mAh g−1 at 200 mA g−1) and long-term stability (88% retention after 200 cycles). This is due to the crystalline structure of Zn3V2O8/hGO, with a large surface area that can provide more reaction sites and facilitate the fast Li+-ion transport as verified by the electrochemical impedance spectroscopy analysis. The ex situ X-ray photoelectron spectrometer reveals the involvement of multiple reaction mechanisms (conversion, (de) insertion and (de) alloying) showing Zn2+/Zn0 and V4+/V3+/V2+ redox couples during the electrochemical process.
KW - anode material
KW - holey graphene
KW - lithium-ion batteries
KW - ZnVO
UR - http://www.scopus.com/inward/record.url?scp=85128096784&partnerID=8YFLogxK
U2 - 10.1002/er.7920
DO - 10.1002/er.7920
M3 - Article
AN - SCOPUS:85128096784
SN - 0363-907X
VL - 46
SP - 11200
EP - 11213
JO - International Journal of Energy Research
JF - International Journal of Energy Research
IS - 8
ER -