Carbon-rich shungite as a natural resource for efficient Li-ion battery electrodes

Carbon-rich shungite as a natural resource for efficient Li-ion battery electrodes

Journal Article

Abstract

A wide variety of synthetic carbon allotropes embrace the tremendous potential for energy storage applications.
There have been a number of reports on the synthesis of carbonaceous anode materials with lithium (Li) storage capacity larger than the theoretical limit for graphite (372 mAh/g, corresponding to LiC6). However, besides the performance, available resources and cost efficiency are obstacles that could hinder their exploitation. Here we present carbon-rich Precambrian rock “shungite” as a natural resource for a Li-ion battery anode. It is found that upon structural modification the energy density of fully lithiated “shungite” can exceed the density of graphite, becoming comparable to non-graphitizable (“hard”) carbon. High-resolution transmission electron microscopy (HRTEM) studies of modified “shungite” suggest that it consist of spatially arranged fractals of bended, curved, mono- or stacked graphene layers. By analyzing the features of 7Li Nuclear Magnetic Resonance (NMR) spectra of fully lithiated “shungite” we conclude that the enhanced storage capacity is mainly due to the presence of open edge few layered graphene flakes. We thus suggest carbon-rich “shungite” as an alternative and the effective natural resource for Li-ion battery electrodes.

Details

PUBLISHED IN
Carbon 2018
PUBLICATION DATE
02 huhtikuuta 2018
AUTHORS
Nam Hawn Chou, Neal Pierce, Yu Lei, Nestor Perea-Lopez, Kazunori Fujisawa, Shruti Subramanian, Joshua A. Robinson, Gugang Chen, Kaoru Omichi, Sergey S. Rozhkov, Natalia N. Rozhkova, Mauricio Terrones, Avetik R. Harutyunyan