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

Abstract

As anode materials for high‐performance Li‐ion batteries, peapod‐like Ge‐based composites, including Ge, a Li‐inactive conducting Cu3Ge, and a porous carbon matrix are synthesized simply by annealing CuGeO3@dopamine in a H2/Ar atmosphere. The introduction of the carbon layer and inactive alloying phase Cu3Ge not only enhances the electrical conductivity of the Ge anode, but also reduces the volume change of Ge during the cell cycle as a buffer. In particular, the anode of this peapod‐like Cu3Ge/Ge@C shows an excellent long cycle life as well as outstanding capacity performance, with a discharge specific capacity up to 934 mA h g−1 after 500 cycles.

Flexible MoS2 Anchored on Ge-Containing Carbon Nanofibers

“…Nanostructured carbon can compensate for the volume change, prevent the aggregation of active materials, enhance the number of active sites, shorten ionic transport pathways, increase the electronic/ionic conductivity, and hence, improve the cycling and rate performance by facilitating fast electron/ion transmission [ 8 ]. Some Ge-based composites have been studied, including nanostructured carbon/Ge composites for LIBs [ 9 , 10 , 11 , 12 , 13 ]. However, there is a need to design and prepare Ge-containing composite anodes to improve their electrochemical properties.…”

Scalable One-Pot Synthesis of Hierarchical Bi@C Bulk with Superior Lithium-Ion Storage Performances

“…As a typical alloying-type material, the Bi anode possesses a volume energy density of 3800 mAh cm –3 , which is much higher than that of familiar alloying-type materials, such as Sb (1889 mAh cm –3 ), Sn (1991 mAh cm –3 ), and Si (2190 mAh cm –3 ). − Furthermore, Bi also displays both high ion conductivity and narrow band gap, bringing about numerous attention. , Nevertheless, grievous volume variation accomplished with the alloying process causes awful structure fracture and severe polarization, thereby resulting in rapid capacity decay and unfavorable rate capability. − Recently, many efforts have been poured into discovering and engineering of alloying-type anode materials for LIBs. − It is widely recognized that surface modification and nanostructure tailoring are the most promising approaches to moderate the stress that originates from volume fluctuation and protect the structure from collapsing. − On account of these advantages, various alloying-type materials with particular nanostructure have sprung up as an anode for alkali-ion batteries, − including the peapod-like Cu 3 Ge/Ge@C, yolk–shell Sb@C, and yolk–shell Sn 4 P 3 @C . Especially, Yu’s group legitimately designed multicore–shell Bi@NC nanospheres and achieved stable long cycle stability for both sodium-ion batteries (SIBs) and potassium-ion batteries (KIBs) .…”

“…32−34 It is widely recognized that surface modification and nanostructure tailoring are the most promising approaches to moderate the stress that originates from volume fluctuation and protect the structure from collapsing. 35−38 tages, various alloying-type materials with particular nanostructure have sprung up as an anode for alkali-ion batteries, 39−41 including the peapod-like Cu 3 Ge/Ge@C, 42 yolk−shell Sb@C, 43 and yolk−shell Sn 4 P 3 @C. 44 Especially, Yu's group legitimately designed multicore−shell Bi@NC nanospheres and achieved stable long cycle stability for both sodium-ion batteries (SIBs) and potassium-ion batteries (KIBs). 25 Dou et al skillfully obtained an anode of Bi nanorods@N-doped carbon nanotubes by in situ carbonization and reduction of Bi 2 S 3 @resorcinol-formaldehyde and exhibited a capacity about 400 mAh g −1 at 50 mA g −1 after 100 cycles for SIBs.…”