Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 21, Pages 23781-23788Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c00659
Keywords
reconstructed graphite; anode; Na ion battery; metallic pillar; reduced graphite oxide
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2018R1A5A1025224, 2019R1C1C1007886, 2019M3D1A2104105]
- Korea Evaluation Institute of Industrial Technology (KEIT) - Korean government (MOTIE) [10077594]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10077594] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018R1A5A1025224] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
The applicability of Na-ion batteries is contingent on breakthroughs in alternative electrode materials that have high capacities and which are economically viable. Unfortunately, conventional graphite anodes for Li-ion battery systems do not allow Na-ion accommodation into their interlayer space owing to the large ionic radius and low stabilizing energy of Na in graphite. Here, we suggest a promising strategy for significantly increasing Na capacity by expanding the axial slab space of graphite. We successfully synthesized reconstructed graphite materials via self-assembly of negative graphite oxide (GO) flakes and Al cation (positive) pillars and by subsequent chemical reaction of the obtained Al-GO materials. Al pillars, atomically distributed in graphite interlayers, can extend the slab space by up to similar to 7 angstrom, which is a 2-fold interlayer distance of pristine graphite. An exceptionally high capacity of 780 mAh/g is demonstrated for reconstructed graphite anodes with Al pillars, compared with rGO materials (210 mAh/g). We investigated the electrochemical reaction mechanism and structural changes associated with discharge and charge to emphasize the benefit of using reconstructed graphite as anodes in Na-ion batteries. Our strategy of modifying the interlayer distance by introducing metallic pillars between the layers can help address the low capacity of carbonaceous anodes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available