Germanium-based complex derived porous GeO2 nanoparticles for building high performance Li-ion batteries

Zhang, Junhao; Yu, Tingting; Chen, Jiale; Liu, Huili; Su, Dongqin; Tang, Zehua; Xie, Jing; Chen, Lei; Yuan, Aihua; Kong, Qinghong

doi:10.1016/j.ceramint.2017.10.069

Cited by 33 publications

(16 citation statements)

References 44 publications

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“…In addition, the decomposition of sodium carbonate (resultant of sodium and its oxidized sites) on/in the HC-SC was discovered to be associated with irreversible capacity. [46] Beyond the initial cycle, the successive galvanostatic profiles over the long-term cycling are almost identical, indicating the excellent stability of HC-SC electrode. The cycle performances of HC-SC, HC and SC at 500 mA g À 1 are compared in Figure 4c.…”

Section: Resultsmentioning

confidence: 82%

A Promising Hard Carbon−Soft Carbon Composite Anode with Boosting Sodium Storage Performance

Xue

Gao

et al. 2020

ChemElectroChem

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Hard carbon anodes are the most promising candidates for sodium-ion batteries due to lower sodium-embedded platform and higher specific capacity. However, pure hard carbon carbons usually show very low initial coulombic efficiency, low electronic conductance, et al. Herein, hard carbon-soft carbon (HC-SC) composites composed of carbon nanotubes (CNTs) blooming on porous hard carbon, which were synthesized through thermal decomposition of zeolitic imidazolate framework-67 (ZIF-67) and polyvinyl alcohol (PVA) composite. This unique structure could greatly promote the sodium-ion diffusion and electron transport due to the increased electrode/ electrolyte contact area and enlarged pores. As expected, the HC-SC delivers a high capacity (306.8 mAh g À 1 at 500 mA g À 1), impressive cycling stability (256.8 mAh g À 1 after 1000 cycles) and enhanced rate performance (144.9 mAh g À 1 at 20 C), which are far superior to those of both individual hard carbon and soft carbon. This encouraging performance may benefit from the synergistic effect of the modified defect concentration and interlayer distance in hard carbon by soft carbon, as well as the unique hierarchical structure. This work provides an exemplary strategy to develop optimized carbon materials for sodium-ion batteries.

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Section: Resultsmentioning

confidence: 82%

A Promising Hard Carbon−Soft Carbon Composite Anode with Boosting Sodium Storage Performance

Xue

Gao

et al. 2020

ChemElectroChem

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“…In agreement with the literature [36,41,56], the incorporation of germanium in the iron oxide lattice did not caused appreciable variations in the spectral profile, but a slight shift (~0.4 eV) of spin-orbit doublets and shake-up satellites towards higher binding energies, for which both co-formation of maghemite [76] and incorporation of germanium [41] could have been responsible. In the Fe2O3:Ge NFs, the binding energy position of the Ge 2p3/2 (1220 eV, inset to Figure 3a) and Ge 3d (32 eV, not shown) core levels evidenced the presence of Ge ions with +4 oxidation state [77][78][79]. O 1s core level of the two samples exhibited evident differences both in terms of binding energy and shape (Figure 3b), hinting at different surrounding cations.…”

Section: Physicochemical Properties Of the Nfsmentioning

confidence: 99%

Effect of Germanium Incorporation on the Electrochemical Performance of Electrospun Fe2O3 Nanofibers-Based Anodes in Sodium-Ion Batteries

et al. 2021

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Fe2O3 and Fe2O3:Ge nanofibers (NFs) were prepared via electrospinning and thoroughly characterized via several techniques in order to investigate the effects produced by germanium incorporation in the nanostructure and crystalline phase of the oxide. The results indicate that reference Fe2O3 NFs consist of interconnected hematite grains, whereas in Fe2O3:Ge NFs, constituted by finer and elongated nanostructures developing mainly along their axis, an amorphous component coexists with the dominant α-Fe2O3 and γ-Fe2O3 phases. Ge4+ ions, mostly dispersed as dopant impurities, are accommodated in the tetrahedral sites of the maghemite lattice and probably in the defective hematite surface sites. When tested as anode active material for sodium ion batteries, Fe2O3:Ge NFs show good specific capacity (320 mAh g−1 at 50 mA g−1) and excellent rate capability (still delivering 140 mAh g−1 at 2 A g−1). This behavior derives from the synergistic combination of the nanostructured morphology, the electronic transport properties of the complex material, and the pseudo-capacitive nature of the charge storage mechanism.

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“…Due to its high theoretical capacity of 2152 mAh/g, in the case that it reversibly stores 8.4 Li + , GeO 2 is considered as an encouraging anode material for LIBs [9]. In addition, GeO 2 is cheaper than pure Ge.…”

Section: Germanium Oxide Based Nanomaterialsmentioning

confidence: 99%

“…However, its fast implementation in LIBs is hindered by the GeO 2 poor electrical conductivity and the very big volume changes during the charge/discharge process, resulting in the degradation (pulverization) of the electrode material, unstable SEI and as a result poor performance. In an attempt to obtain novel GeO 2 -based anode materials with enhanced performance, preparation of porous GeO 2 nanoparticles through thermal decomposition of (Hbipy) 2 [Ge(C 2 O 4 ) 3 ]·2H 2 O in air atmosphere has been proposed [9]. The idea was to use the ability of porous structures to relax the mechanical strain resulting from the volume expansion during cyclic process, as well as their large surface area facilitating electrode-electrolyte interface, and thin walls ensuring fast diffusion of Li + .…”

Section: Germanium Oxide Based Nanomaterialsmentioning

confidence: 99%

Recent studies on germanium-nanomaterials for LIBs anodes

2020

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The inherently law capacity of the classically used carbon-based anode is one of the major drawbacks hindering the wide application of lithium ion batteries (LIBs) in electric vehicles. Carbon replacement with materials possessing high theoretical capacity, such as germanium (Ge) represents one of the approaches used for ensuring wider LIBs' implementation. The main disadvantage of the Ge use is its huge volume change during the lithiation / delithiation, causing Ge-based electrodes pulverization, deterioration of the electrochemical properties and resulting in electrodes relatively short life. Usage of Ge based nanomaterials is regarded as powerful tool for overcoming the mentioned drawbacks. This paper reviews and discusses the very recent progress in the preparation and studying the Ge nanoparticles (NPs), Ge nanoalloys and Ge-based nanocomposites as attempts for preparation of advanced anodes for LIBs.

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Germanium-based complex derived porous GeO2 nanoparticles for building high performance Li-ion batteries

Cited by 33 publications

References 44 publications

A Promising Hard Carbon−Soft Carbon Composite Anode with Boosting Sodium Storage Performance

A Promising Hard Carbon−Soft Carbon Composite Anode with Boosting Sodium Storage Performance

Effect of Germanium Incorporation on the Electrochemical Performance of Electrospun Fe2O3 Nanofibers-Based Anodes in Sodium-Ion Batteries

Recent studies on germanium-nanomaterials for LIBs anodes

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