Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 39, Pages 19907-19912Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05400a
Keywords
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Funding
- National Basic Research Program of China (973 program) [2015CB932500, 2014CB643300, 2013CB934001]
- NSF of China [51172024, 51372022]
- Ministry of Education [20130006110019]
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As a promising high capacity electrode material for lithium-ion batteries, germanium anodes are still to date restricted by the large volume change (>300%) during repeated cycling, which leads to a short cycle life and poor cycle stability in practical application. To overcome these challenges, herein a facile fabrication is reported to encapsulate GeOx nanoparticles into hollow carbon shells using co-axial electrospinning. This core-shell structure has shown remarkable improvements in alleviating the volume change of GeOx during cycling, minimizing the contact area between electrolyte and GeOx to form a stable solid electrolyte interface film, and providing enhanced electrical conductivity. In addition, Ge nanoparticles in the GeOx composite can promote the reversible capacity for the reversible utilization of Li2O. As a result, such a GeOx@C composite electrode exhibits excellent cycling ability with a reversible specific capacity of 875 mA h g(-1) at 160 mA g(-1) after 400 cycles, along with an improved rate capacity of 513 mA h g(-1) at a high current density of 1600 mA g(-1) upon 500 cycles.
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