Nanoporous GeO2/Cu/Cu2O network synthesized by dealloying method for stable Li-ion storage

Zhumabay Bakenov, Yongguang Zhang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Transition metal oxide Cu2O anode is still not meeting the current market demands due to the low theoretical capacity and poor cycle stability. We herein report the synthesis of a nanoporous GeO2/Cu/ Cu2O network by a straightforward dealloying method. The resulting material possesses high porosity which served to alleviate the stress incurred during lithiation/delithiation volume variation and presents good conductivity for fast electron transfer. Enhanced electrochemical performance is observed when measured as an anode material, delivering 715mAh g1 at 200mA g1 after 50 cycles and offered 504mAh g1 even at a high current density of 1600 mA g1 after 150 cycles. Furthermore, the material also demonstrates excellent rate performance of 812, 782, 741, 695, 635 and 552 mAh g1 at 100, 200, 500, 800, 1600 and 3200 mA g1 current densities, respectively. The enhanced Li storage performances could be ascribed to the reticular ligament with high porosity, the increased conductivity by Cu as well as the improved capacity from GeO2. Moreover, this work provides us a new material design strategy to fabricate various porous composite anodes with high capacity through a straightforward dealloying method in future for lithium-ion battery applications.
Original languageEnglish
Pages (from-to)363-372
Number of pages10
JournalElectrochimica Acta
Volume300
DOIs
Publication statusPublished - Jan 25 2019

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Ions
Anodes
Current density
Porosity
Ligaments
Oxides
Transition metals
germanium oxide
Electrons
Composite materials
Lithium-ion batteries

Keywords

  • Dealloying
  • Nanoporous
  • Cu2O
  • GeO2
  • Li-ion battery

Cite this

Nanoporous GeO2/Cu/Cu2O network synthesized by dealloying method for stable Li-ion storage. / Bakenov, Zhumabay; Zhang, Yongguang.

In: Electrochimica Acta, Vol. 300, 25.01.2019, p. 363-372.

Research output: Contribution to journalArticle

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abstract = "Transition metal oxide Cu2O anode is still not meeting the current market demands due to the low theoretical capacity and poor cycle stability. We herein report the synthesis of a nanoporous GeO2/Cu/ Cu2O network by a straightforward dealloying method. The resulting material possesses high porosity which served to alleviate the stress incurred during lithiation/delithiation volume variation and presents good conductivity for fast electron transfer. Enhanced electrochemical performance is observed when measured as an anode material, delivering 715mAh g1 at 200mA g1 after 50 cycles and offered 504mAh g1 even at a high current density of 1600 mA g1 after 150 cycles. Furthermore, the material also demonstrates excellent rate performance of 812, 782, 741, 695, 635 and 552 mAh g1 at 100, 200, 500, 800, 1600 and 3200 mA g1 current densities, respectively. The enhanced Li storage performances could be ascribed to the reticular ligament with high porosity, the increased conductivity by Cu as well as the improved capacity from GeO2. Moreover, this work provides us a new material design strategy to fabricate various porous composite anodes with high capacity through a straightforward dealloying method in future for lithium-ion battery applications.",
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N2 - Transition metal oxide Cu2O anode is still not meeting the current market demands due to the low theoretical capacity and poor cycle stability. We herein report the synthesis of a nanoporous GeO2/Cu/ Cu2O network by a straightforward dealloying method. The resulting material possesses high porosity which served to alleviate the stress incurred during lithiation/delithiation volume variation and presents good conductivity for fast electron transfer. Enhanced electrochemical performance is observed when measured as an anode material, delivering 715mAh g1 at 200mA g1 after 50 cycles and offered 504mAh g1 even at a high current density of 1600 mA g1 after 150 cycles. Furthermore, the material also demonstrates excellent rate performance of 812, 782, 741, 695, 635 and 552 mAh g1 at 100, 200, 500, 800, 1600 and 3200 mA g1 current densities, respectively. The enhanced Li storage performances could be ascribed to the reticular ligament with high porosity, the increased conductivity by Cu as well as the improved capacity from GeO2. Moreover, this work provides us a new material design strategy to fabricate various porous composite anodes with high capacity through a straightforward dealloying method in future for lithium-ion battery applications.

AB - Transition metal oxide Cu2O anode is still not meeting the current market demands due to the low theoretical capacity and poor cycle stability. We herein report the synthesis of a nanoporous GeO2/Cu/ Cu2O network by a straightforward dealloying method. The resulting material possesses high porosity which served to alleviate the stress incurred during lithiation/delithiation volume variation and presents good conductivity for fast electron transfer. Enhanced electrochemical performance is observed when measured as an anode material, delivering 715mAh g1 at 200mA g1 after 50 cycles and offered 504mAh g1 even at a high current density of 1600 mA g1 after 150 cycles. Furthermore, the material also demonstrates excellent rate performance of 812, 782, 741, 695, 635 and 552 mAh g1 at 100, 200, 500, 800, 1600 and 3200 mA g1 current densities, respectively. The enhanced Li storage performances could be ascribed to the reticular ligament with high porosity, the increased conductivity by Cu as well as the improved capacity from GeO2. Moreover, this work provides us a new material design strategy to fabricate various porous composite anodes with high capacity through a straightforward dealloying method in future for lithium-ion battery applications.

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