Germanium-based high-performance dual-ion batteries

Abstract

We report a novel germanium-based dual-ion battery that shows better electrochemical performance than most of the previously reported DIBs.

In-situ construction of conducting alloy interphase towards modulating Li-ion storage kinetics

“…Due to this special ternary structure, compared with others Ge-based anodes, the Ge@MoGe 2 @MoS 2 exhibits outstanding rate properties, especially at ultrahigh current densities of 2.0 and 5.0 A g À1 (Fig. 5f) [11,19,41,[44][45][46][47][48][49][50][51][52][53][54][55]57,58].…”

A Review of Emerging Dual‐Ion Batteries: Fundamentals and Recent Advances

“…Other group IV elements, such as Ge and Sn have also been considered very promising alloying‐type anodes in DIBs. [ 32,79,80 ] Among them, Ge exhibits better electronic conductivity (10 4 times higher than Si) and Li‐ion diffusivity (400 times faster than Si) at room temperature. [ 94 ] A Ge/CNFs anode was developed by employing Ge nanoparticles embedded in 1D carbon nanofibers.…”

“…[ 94 ] A Ge/CNFs anode was developed by employing Ge nanoparticles embedded in 1D carbon nanofibers. [ 79 ] Ge can alloy with Li to form amorphous Li x Ge (from Li 2.25 Ge to Li 4 Ge) with the highest theoretical capacity of 1626 mAh g −1 , and then amorphous Li x Ge alloy was converted into amorphous Ge through the dealloying process (Figure 5g). The carbon nanofibers matrix can improve the Li‐ion diffusion and maintain the structural stability during cycling, resulting in a reversible SC of 1088 mAh g −1 with nearly 100% CE.…”

“…[ 5c,6b,33,48a ] An electrolyte of 1 M LiPF 6 –EC/DMC (1:2, v/v) can endure an operating potential of 4.6 V in the prepared Ge/CNFs–graphite DIB. [ 79 ] A P‐HCNs–graphite DIB based on the electrolyte of 1 m NaPF 6 –EC/DEC (4:6, v/v) showed stable cycling stability of 1500 cycles at an upper cut‐off voltage of 4.7 V. [ 5d ] Besides, a 1 m LiPF 6 –EC/EMC/DMC (1:1:1, v/v/v) electrolyte based KNi 0.1 Co 0.9 F 3 –graphite DIB can work well at the working potential of 0.5–5.5 V. [ 84 ] Especially, DIBs with EMC‐based electrolytes usually get superior electrochemical performances when compared to other carbonates, which makes EMC the more frequently used organic solvent for DIBs. [ 51,102 ] It has also been confirmed that EMC‐based electrolytes can form a thin layer of cathode electrolyte interface (CEI) on the graphite surface with few Li–F and ROCO 2 Li species than that with DMC and DEC, which effectively reduced the charge transfer resistance, polarization, and self‐discharge of graphite electrodes, resulting in a DIB with enhanced CE, cycle and rate performance.…”

A novel and fast method to prepare a Cu-supported α-Sb2S3@CuSbS2binder-free electrode for sodium-ion batteries

“…First, the electrode is composed of only active materials, avoiding the addition of binder or other inactive materials, which has positive effects on improving electrode conductivity. 51 Second, a-Sb 2 S 3 @CuSbS 2 composite material is the key guarantee for the electrode to have excellent performance. The unique structure can enable the active material to be rmly anchored to the current collector without binder.…”