PMID- 37216415
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20230608
LR  - 20230608
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 15
IP  - 22
DP  - 2023 Jun 7
TI  - Cation-Driven Assembly of Bilayered Vanadium Oxide and Graphene Oxide Nanoflakes 
      to Form Two-Dimensional Heterostructure Electrodes for Li-Ion Batteries.
PG  - 26525-26537
LID - 10.1021/acsami.2c22916 [doi]
AB  - Lithium preintercalated bilayered vanadium oxide (LVO or delta-Li(x)V(2)O(5).nH(2)O) 
      and graphene oxide (GO) nanoflakes were assembled using a concentrated lithium 
      chloride solution and annealed under vacuum at 200  degrees C to form two-dimensional 
      (2D) delta-Li(x)V(2)O(5).nH(2)O and reduced GO (rGO) heterostructures. We found that 
      the Li(+) ions from LiCl enhanced the oxide/carbon heterointerface formation and 
      served as stabilizing ions to improve structural and electrochemical stability. 
      The graphitic content of the heterostructure could be easily controlled by 
      changing the initial GO concentration prior to assembly. We found that increasing 
      the GO content in our heterostructure composition helped inhibit the 
      electrochemical degradation of LVO during cycling and improved the rate 
      capability of the heterostructure. A combination of scanning electron microscopy 
      and X-ray diffraction was used to help confirm that a 2D heterointerface formed 
      between LVO and GO, and the final phase composition was determined using 
      energy-dispersive X-ray spectroscopy and thermogravimetric analysis. Scanning 
      transmission electron microscopy and electron energy-loss spectroscopy were 
      additionally used to examine the heterostructures at high resolution, mapping the 
      orientations of rGO and LVO layers and locally imaging their interlayer spacings. 
      Further, electrochemical cycling of the cation-assembled LVO/rGO heterostructures 
      in Li-ion cells with a non-aqueous electrolyte revealed that increasing the rGO 
      content led to improved cycling stability and rate performance, despite slightly 
      decreased charge storage capacity. The heterostructures with 0, 10, 20, and 35 wt 
      % rGO exhibited capacities of 237, 216, 174, and 150 mAh g(-1), respectively. 
      Moreover, the LVO/rGO-35 wt % and LVO/rGO-20 wt % heterostructures retained 75% 
      (110 mAh g(-1)) and 67% (120 mAh g(-1)) of their initial capacities after 
      increasing the specific current from 20 to 200 mA g(-1), while the LVO/rGO-10 wt 
      % sample retained only 48% (107 mAh g(-1)) of its initial capacity under the same 
      cycling conditions. In addition, the cation-assembled LVO/rGO electrodes 
      exhibited enhanced electrochemical stability compared to electrodes prepared 
      through physical mixing of LVO and GO nanoflakes in the same ratios as the 
      heterostructure electrodes, further revealing the stabilizing effect of a 2D 
      heterointerface. The cation-driven assembly approach, explored in this work using 
      Li(+) cations, was found to induce and stabilize the formation of stacked 2D 
      layers of rGO and exfoliated LVO. The reported assembly methodology can be 
      applied for a variety of systems utilizing 2D materials with complementary 
      properties for applications as electrodes in energy storage devices.
FAU - Andris, Ryan
AU  - Andris R
AD  - Department of Materials Science and Engineering, Drexel University, Philadelphia, 
      Pennsylvania 19104, United States.
FAU - Averianov, Timofey
AU  - Averianov T
AD  - Department of Materials Science and Engineering, Drexel University, Philadelphia, 
      Pennsylvania 19104, United States.
FAU - Zachman, Michael J
AU  - Zachman MJ
AUID- ORCID: 0000-0003-1910-1357
AD  - Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak 
      Ridge, Tennessee 37831, United States.
FAU - Pomerantseva, Ekaterina
AU  - Pomerantseva E
AUID- ORCID: 0000-0002-6765-7133
AD  - Department of Materials Science and Engineering, Drexel University, Philadelphia, 
      Pennsylvania 19104, United States.
LA  - eng
PT  - Journal Article
DEP - 20230522
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
SB  - IM
OTO - NOTNLM
OT  - 2D heterostructures
OT  - Li-ion batteries
OT  - bilayered vanadium oxide
OT  - liquid phase exfoliation
OT  - nanoflake assembly
OT  - reduced graphene oxide
EDAT- 2023/05/22 19:11
MHDA- 2023/05/22 19:12
CRDT- 2023/05/22 13:44
PHST- 2023/05/22 19:12 [medline]
PHST- 2023/05/22 19:11 [pubmed]
PHST- 2023/05/22 13:44 [entrez]
AID - 10.1021/acsami.2c22916 [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2023 Jun 7;15(22):26525-26537. doi: 
      10.1021/acsami.2c22916. Epub 2023 May 22.