Three-dimensional Mn-doped Zn₂GeO₄ nanosheet array hierarchical nanostructures anchored on porous Ni foam as binder-free and carbon-free lithium-ion battery anodes with enhanced electrochemical performance

Abstract

Mn doping induces the microstructure evolution from nanowire of pure Zn2GeO4 to nanosheet of Mn-doped Zn2GeO4 samples, and enhanced electrochemical performance.

Zn2GeO4 and Zn2SnO4 nanowires for high-capacity lithium- and sodium-ion batteries

“…Our capacity value for Zn 2 GeO 4 NWs is comparable to the best results: 1300 mA h g -1 after 140 cycles for Zn 2 GeO 4 @g-C 3 N 4 nanoparticle@nanosheet composites that reported by X. Li et al; 21 1301 mA h g -1 after 100 cycles for Mn-doped Zn 2 GeO 4 nanosheets that reported by Q. Li et al 23 The capacity of the present Zn 2 SnO 4 NWs is larger than that of Zn 2 SnO 4 powders: 856 mA h g -1 after 50 cycles reported by Lee and Lee. 27 The rate capability and the retention ability were evaluated by increasing the C rate step-wise from 0.1 C to 5 C, and then returning back to 0.1 C. Fig.…”

“…Many previous works also reported the contribution of these conversion reactions, which is essentially the same as our model. [15][16][17][18][19][20][21][22][23] The discharge capacity of Zn 2 SnO 4 after 100 cycles (983 mA h g -1 ) is larger than the theoretical capacity (547 mA h g -1 ) of mechanism "A". Based on the CV and I-V data, we proposed the contribution of the reversible conversion reactions (9) and (10).…”

Ni2P@Carbon Core–Shell Nanoparticle‐Arched 3D Interconnected Graphene Aerogel Architectures as Anodes for High‐Performance Sodium‐Ion Batteries

“…As shown in Figure b, each plot consists of a semicircle in the middle–high frequency region and a sloping line in the low frequency region. The diameter of the semicircle is associated with the contact resistance ( R f ) and charge‐transfer impedance on electrode–electrolyte interface ( R ct ), whereas the sloping line is ascribed to the Warburg impedance ( R w ), which is associated with the diffusion coefficient of Na + at the interface between the electrode and the electrolyte . It can be seen that the diameter of the semicircle of Ni 2 P@C/GA is much smaller than that of Ni 2 P/G electrodes, indicating that the addition of carbon layer shell on Ni 2 P and GA 3D‐connected architecture can effectively decrease the charge transfer resistance by restraining the aggregation of Ni 2 P nanoparticles and increasing the conductivity of the composite, respectively, thus improving the electron kinetics of the composite electrodes.…”

Nanoarchitectured Array Electrodes for Rechargeable Lithium‐ and Sodium‐Ion Batteries

“…The metal hydroxycarbonate nanoarrays can be synthesized by a simple hydro/solvothermal method on different substrates and chemically transfer to the corresponding oxide nanoarrays with a post‐annealing treatment. So far, a large amount of work has reported single or hybrid oxide NAA electrodes based on this chemical transformation process, which includes Co, Ni, Ni‐Co, Zn‐Co, and Zn‐Ge oxides . In addition, depending on the concentration of Co precursor, ZnO nanorod arrays have been used to fabricate both CoO‐ZnO nanoarrays by physical integration and ZnCo 2 O 4 nanoarrays by chemical transformation …”