Cu3Ge/Ge@C nanocomposites crosslinked by the in situ formed carbon nanotubes for high-rate lithium storage

Liu, Xianyu; Lin, Ning; Xu, Kangli; Han, Ying; Lu, Yue; Zhao, Yingyue; Zhou, Jie; Yi, Zheng; Cao, Changhe; Qian, Yitai

doi:10.1016/j.cej.2018.07.015

Cited by 17 publications

(7 citation statements)

References 46 publications

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“…In addition, the two characteristic peaks at 777.9 and 792.3 eV are observed in the Co 2p spectrum (Figure S7b), which corresponds to Co. 43 Simultaneously, the peak at 28.9 eV in the Ge 3d spectrum corresponds to Ge (Figure S7c). 44 Furthermore, the content of Co 5 Ge 3 in Co 5 Ge 3 /N-CNT is about 73.47%, which is calculated by the TG result (Figure S8).…”

Section: ■ Results and Discussionmentioning

confidence: 88%

“…20,21 For example, the Cu 3 Ge/Ge@ G composite prepared via calcining graphene oxide nanosheets and CuGeO 3 nanowires boosted the lithium storage performance by enhancing the electron migration rate of the electrode. 22 Wei et al 21 Lately, metal−organic framework (MOF) materials have been noted as optimistic precursors for preparing CNTs, 24,25 in which the metal ion plays a catalytic role and the CNTs are derived from the organic ligand. Meanwhile, metal nanoparticles could be uniformly distributed in CNTs because of the confining effects from CNTs.…”

Section: ■ Introductionmentioning

confidence: 99%

“…On the other hand, the M x Ge y (M = metal elements) alloys have also served as LIB anode materials and exhibited remarkable performance. , For example, the Cu 3 Ge/Ge@G composite prepared via calcining graphene oxide nanosheets and CuGeO 3 nanowires boosted the lithium storage performance by enhancing the electron migration rate of the electrode . Wei et al designed a multiphase composite of Ge/FeGe/FeGe 2 /C, delivering a capacity of 1095 mA h g –1 at 0.1 A g –1 , which was ascribed to its inherently high electronic conductivity.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Confined Co₅Ge₃ Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage

Tang

Huang

et al. 2020

ACS Appl. Mater. Interfaces

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Ge-based materials have garnered much attention in lithium-ion batteries (LIBs) for their high theoretical capacity, but these materials suffer from huge volume changes and serious pulverization, which cause insufficient lithium storage performance. Herein, a composite composed of Co 5 Ge 3 -and nitrogen-doped carbon nanotube (Co 5 Ge 3 /N-CNT) was successfully synthesized using ZIF-67 and GeO 2 as precursors. There are interactions between the Co 5 Ge 3 alloy nanoparticles and carbon nanotubes in the growth process, in which the Co 5 Ge 3 alloy nanoparticles were confined in situ in N-CNTs and the in situ growth of N-CNTs was boosted in the existence of the Co 5 Ge 3 catalyst. Density functional theory calculations revealed that the electronic conductivity of the Co 5 Ge 3 alloy is much higher than that of Ge and the Li + interaction energy of the former is lower than that of the latter. In addition, the interconnected carbon nanotubes not only offer Li + diffusion pathways and electronic networks but also increase electronic conductivity. Importantly, carbon nanotubes and Co metal have a synergistic effect of buffering volume charge of Ge in the process of Li + intercalation/deintercalation. As expected, the Co 5 Ge 3 /N-CNT composite demonstrated a high reversible capacity of 853.7 mA h g −1 at 2 A g −1 after 1500 cycles and attractive rate performance of up to 10 A g −1 .

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Section: ■ Results and Discussionmentioning

confidence: 88%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ Confined Co₅Ge₃ Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage

Tang

Huang

et al. 2020

ACS Appl. Mater. Interfaces

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“…The CuO-Ge hybrid film delivers an initial discharge and charge capacity of ∼5.09 and 3.81 mA h cm −2 , giving the initial Coulombic efficiency of 74.8%. The irreversible discharge capacity is associated with the formation of solid electrolyte interface layer and the irreversible insertion of Li + into CuO and Ge films, which are common for CuO and Ge based anodes (Chan et al, 2008;Chockla et al, 2012;Yuan et al, 2012;Mullane et al, 2013;Liu et al, 2018a). The low Coulombic efficiency may restrict the capacity of anode materials; however, it has been demonstrated that LIBs must undergo a few charge-discharge cycles, which is generally called the "formation process" (Chen et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…However, the considerable capacities of Ge and CuO are generally accompanied by drastic volume change upon Li intercalation and deintercalation, thus causing the poor cycling performance (Liu et al, 2015;So et al, 2018). Great efforts have been made to solve the pulverization problem during the Li insertion and extraction process using nanomaterials such as nanoparticles (Hyojin et al, 2005;Mi-Hee et al, 2010;Yang et al, 2010), nanowires (Chan et al, 2008;Chockla et al, 2012;Yuan et al, 2012;Mullane et al, 2013), nanotubes (Chen et al, 2009;Cao et al, 2015;Liu et al, 2018a;Sun et al, 2018), and so on. For example, Li et al synthesized mesoporous and hollow Ge@C nanostructures via carbon coating and reduced the hollow ellipsoidal GeO 2 precursor into Ge.…”

Section: Introductionmentioning

confidence: 99%

A Hierarchical Copper Oxide–Germanium Hybrid Film for High Areal Capacity Lithium Ion Batteries

Deng

et al. 2020

Front. Chem.

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Self-supported electrodes represent a novel architecture for better performing lithium ion batteries. However, lower areal capacity restricts their commercial application. Here, we explore a facial strategy to increase the areal capacity without sacrificing the lithium storage performance. A hierarchical CuO-Ge hybrid film electrode will not only provide high areal capacity but also outstanding lithium storage performance for lithium ion battery anode. Benefiting from the favorable structural advance as well as the synergic effect of the Ge film and CuO NWs array, the hybrid electrode exhibits a high areal capacity up to 3.81 mA h cm −2 , good cycling stability (a capacity retention of 90.5% after 150 cycles), and superior rate performance (77.4% capacity remains even when the current density increased to 10 times higher).

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Promoting Ge Alloying Reaction via Heterostructure Engineering for High Efficient and Ultra‐Stable Sodium‐Ion Storage

Shang

Luo

et al. 2020

Advanced Science

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Germanium (Ge)-based materials have been considered as potential anode materials for sodium-ion batteries owing to their high theoretical specific capacity. However, the poor conductivity and Na + diffusivity of Ge-based materials result in retardant ion/electron transportation and insufficient sodium storage efficiency, leading to sluggish reaction kinetics. To intrinsically maximize the sodium storage capability of Ge, the nitrogen doped carbon-coated Cu 3 Ge/Ge heterostructure material (Cu 3 Ge/Ge@N-C) is developed for enhanced sodium storage. The pod-like structure of Cu 3 Ge/Ge@N-C exposes numerous active surface to shorten ion transportation pathway while the uniform encapsulation of carbon shell improves the electron transportation, leading to enhanced reaction kinetics. Theoretical calculation reveals that Cu 3 Ge/Ge heterostructure can offer decent electron conduction and lower the Na + diffusion barrier, which further promotes Ge alloying reaction and improves its sodium storage capability close to its theoretical value. In addition, the uniform encapsulation of nitrogen-doped carbon on Cu 3 Ge/Ge heterostructure material efficiently alleviates its volume expansion and prevents its decomposition, further ensuring its structural integrity upon cycling. Attributed to these unique superiorities, the as-prepared Cu 3 Ge/Ge@N-C electrode demonstrates admirable discharge capacity, outstanding rate capability and prolonged cycle lifespan (178 mAh g −1 at 4.0 A g −1 after 4000 cycles). Sodium-ion batteries (SIBs) have attracted great attention as one of the most promising energy storage devices.

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Cu3Ge/Ge@C nanocomposites crosslinked by the in situ formed carbon nanotubes for high-rate lithium storage

Cited by 17 publications

References 46 publications

In Situ Confined Co₅Ge₃ Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage

In Situ Confined Co₅Ge₃ Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage

A Hierarchical Copper Oxide–Germanium Hybrid Film for High Areal Capacity Lithium Ion Batteries

Promoting Ge Alloying Reaction via Heterostructure Engineering for High Efficient and Ultra‐Stable Sodium‐Ion Storage

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Cu3Ge/Ge@C nanocomposites crosslinked by the in situ formed carbon nanotubes for high-rate lithium storage

Cited by 17 publications

References 46 publications

In Situ Confined Co5Ge3 Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage

In Situ Confined Co5Ge3 Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage

A Hierarchical Copper Oxide–Germanium Hybrid Film for High Areal Capacity Lithium Ion Batteries

Promoting Ge Alloying Reaction via Heterostructure Engineering for High Efficient and Ultra‐Stable Sodium‐Ion Storage

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In Situ Confined Co₅Ge₃ Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage

In Situ Confined Co₅Ge₃ Alloy Nanoparticles in Nitrogen-Doped Carbon Nanotubes for Boosting Lithium Storage