Ge/GeO₂-Ordered Mesoporous Carbon Nanocomposite for Rechargeable Lithium-Ion Batteries with a Long-Term Cycling Performance

Abstract

Germanium-based nanostructures are receiving intense interest in lithium-ion batteries because they have ultrahigh lithium ion storage ability. However, the Germanium-based anodes undergo the considerably large volume change during the charge/discharge processes, leading to a fast capacity fade. In the present work, a Ge/GeO2-ordered mesoporous carbon (Ge/GeO2-OMC) nanocomposite was successfully fabricated via a facile nanocasting route by using mesoporous carbon as a nanoreactor, and was then used as an anode for lithium-ion batteries. Benefited from its unique three-dimensional "meso-nano" structure, the Ge/GeO2-OMC nanocomposite exhibited large reversible capacity, excellent long-time cycling stability and high rate performance. For instance, a large reversible capacity of 1018 mA h g(-1) was obtained after 100 cycles at a current density of 0.1 A g(-1), which might be attributed to the unique structure of the Ge/GeO2-OMC nanocomposite. In addition, a reversible capacity of 492 mA h g(-1) can be retained when cycled to 500 cycles at a current density of 1 A g(-1).

High capacity and stable all-solid-state Li ion battery using SnO2-embedded nanoporous carbon

“…At the present, the prototype cell using SnO 2 /C45[72] showed a specific energy density of 2040 Wh/kg at the specific power density of 268.6 W/kg based on the anode material weight which is even better performance than a liquid electrolyte-type cell. On the other hand, development of Si-, SiO x - and Ge-embedded porous carbons as a high capacity and stable electrode in OLE system was reported recently 20–22 . By optimization of the composite structure and exploiting the compositional versatility using Si, SiO x , Ge and so on, therefore, we could further extend the possible sets of electrodes for advanced all-solid-state batteries.…”

Preparation of a Si/SiO2–Ordered‐Mesoporous‐Carbon Nanocomposite as an Anode for High‐Performance Lithium‐Ion and Sodium‐Ion Batteries

“…On the other hand, ordered mesoporous carbon (OMC) has attracted extensive attention due to its advantage of uniform pore diameter, large pore volume, and high conductivity . In our previous work, OMC was examined as an effective matrix for dispersing various nanomaterials, such as Ge/GeO 2 –OMC, which exhibited enhanced Li‐ion storage capability and better cycling performance. Similarly, such a nano‐reactor may be extended to fabricate Si‐based composites.…”

Facile Synthesis of Peapod‐Like Cu3Ge/Ge@C as a High‐Capacity and Long‐Life Anode for Li‐Ion Batteries

“…This is attributed to the participation of the alloying phase Cu 3 Ge and the carbon‐coating layer in the Cu 3 Ge/Ge@C electrode. On the other hand, in the low‐frequency range, the slope of the line fitted by the Z re (Y) and ω −1/2 (X) points is inversely proportional to the Li‐ion diffusion coefficient of the anode material . It is clear that the slope of the line corresponding to the Cu 3 Ge/Ge@C electrode is much smaller than that of the commercial Ge (Figure b), indicating the faster ion diffusion in the Cu 3 Ge/Ge@C electrode.…”

“…Herein, through introduction of the inactive alloying element Cu and a good conductive carbon matrix, a novel structure of a peapod‐like Cu 3 Ge/Ge@C anode was designed and synthesized through facile annealing of CuGeO 3 @dopamine in the H 2 /Ar atmosphere. The lithium storage mechanism of the Cu 3 Ge/Ge@C electrode is the reversible alloying reaction between Ge element and Li (Ge+4.4 Li + +4.4 e − ↔Li 4.4 Ge) . Moreover, similar carbon‐coated MoO 2 nanowires and TiO 2 structures have been shown to exhibit good electrochemical performances .…”