Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 31, Pages 9675-9682Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201402151
Keywords
anodes; doping; germanium; lithiation; lithium-ion batteries; sponges
Categories
Funding
- National Natural Science Foundation of China [21173021, 21231002, 21276026, 21271023, 91022006, 20973023]
- 111 Project [B07012]
- 973 Program [2014CB932103]
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Germanium quantum dots embedded in a nitrogen-doped graphene matrix with a sponge-like architecture (Ge/GN sponge) are prepared through a simple and scalable synthetic method, involving freeze drying to obtain the Ge(OH)(4)/graphene oxide (GO) precursor and subsequent heat reduction treatment. Upon application as an anode for the lithium-ion battery (LIB), the Ge/GN sponge exhibits a high discharge capacity compared with previously reported N-doped graphene. The electrode with the as-synthesized Ge/GN sponge can deliver a capacity of 1258 mAhg(-1) even after 50 charge/discharge cycles. This improved electrochemical performance can be attributed to the pore memory effect and highly conductive N-doping GN matrix from the unique sponge-like structure.
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