Abstract
The Hybrid nanoparticles of GeO2/C have been fabricated by decomposition of open-framework germanate compounds GeO2-ethylenediamine (GeO2-EDA) built up from Ge-O clusters, and delivers a superior Li-storage capacity of 984.2 mA h g−1 at a rate of 0.2 A g−1. In addition, a remarkable cycling performance with a capacity of 891.4 mA h g−1 has been obtained after 600 cycles for GeO2/C nanocomposite at a current density of 1 A g−1. Furthermore, the full cell with a commercial LiFePO4 cathode shows a capacity retention of 86% (339.4 W h kg–1) over 100 cycles. The brilliant electrochemical properties of GeO2/C nanocomposite in terms of the desirable capacity, outstanding cycling stability, and superb rate performance is due to the following factors: (i) the electrical conductivity of GeO2 has been enhanced significantly by carbon layer coating; (ii) GeO2/C nanocomposite with a porous structure can buffer the severe volume changes; and (iii) GeO2 nanoparticles can shorten the diffusion distance of lithium ions. As a result, the GeO2/C nanocomposite exhibited an excellent electrochemical performance as an anode in LIBs.
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