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Hybridizing Germanium Anodes with Polysaccharide-Derived Nitrogen-Doped Carbon for High Volumetric Capacity of Li-Ion Batteries

Abstract

Achieving a high volumetric energy Ge anodes leaves behind a big challenge such as a huge volume expansion upon Li-ion uptake. Among various strategies, introduction of conductive and buffering carbon layers can resolve the typical problems (such as a large volume change and poor electrical conductivity) of alloy-type anodes to some extent. On the other hand, a cost-effective and scalable synthesis method has yet to be revealed. In this study, a highly conductive carbon (ANHC) layer derived from polysaccharide with a high nitrogen-doping level (>10%) effectively mitigates a structural deformation of Ge anodes, which is also independently involved in the reversible redox reaction with an improved electrochemical performance compared to typical graphite anodes. The ANHC/Ge self-assembled by carbothermal reduction process has remarkable anode performance in half cell, including stable cycle life (95% capacity retention after 500 cycles at a rate of 1C) with high volumetric capacity of >1500 mAh cm-3 and significant suppression of electrode swelling (<21%). In addition, the full cell consisting of the ANHC/Ge anode and LiCoO2 cathode shows excellent cyclability corresponding to a capacity retention of 73% over 300 cycles at a rate of 1C, which offers ultra-high volumetric energy to be applicable in various energy storage applications.

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Publication details

The article was received on 10 May 2017, accepted on 10 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04028H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hybridizing Germanium Anodes with Polysaccharide-Derived Nitrogen-Doped Carbon for High Volumetric Capacity of Li-Ion Batteries

    S. Park, J. Ryu, D. Hong, S. Shin, W. Y. Choi and A. Kim, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04028H

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