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Title: Low-surface-area hard carbon anode for Na-ion batteries via graphene oxide as a dehydration agent

Na-ion batteries are emerging as one of the most promising energy storage technologies, particularly for grid-level applications. Among anode candidate materials, hard carbon is very attractive due to its high capacity and low cost. However, hard carbon anodes often suffer a low first-cycle Coulombic efficiency and fast capacity fading. In this study, we discover that doping graphene oxide into sucrose, the precursor for hard carbon, can effectively reduce the specific surface area of hard carbon to as low as 5.4 m²/g. We further reveal that such doping can effectively prevent foaming during caramelization of sucrose and extend the pyrolysis burn-off of sucrose caramel over a wider temperature range. Thus, the obtained low-surface-area hard carbon greatly improves the first-cycle Coulombic efficiency from 74% to 83% and delivers a very stable cyclic life with 95% of capacity retention after 200 cycles.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Oregon State Univ., Corvallis, OR (United States)
  2. Sharp Laboratories, Inc., Camas, WA (United States)
Publication Date:
OSTI Identifier:
1224082
Grant/Contract Number:
AR0000297
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society
Research Org:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE hard carbon; Na-ion batteries; anode; low surface area; high first-cycle Coulombic efficiency