Nanosheets‐Assembled CuSe Crystal Pillar as a Stable and High‐Power Anode for Sodium‐Ion and Potassium‐Ion Batteries

Lin, Hezhe; Li, Ma‐Lin; Yang, Xu; Yu, Dongxu; Zeng, Yi; Wang, Chunzhong; Chen, Gang; Du, Fei

doi:10.1002/aenm.201900323

Cited by 198 publications

(147 citation statements)

References 35 publications

(47 reference statements)

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“…After the second cycles, the oxidation peaks at 2.35 and 1.90 V were recorded, but the position of reduction peaks change to 1.5 V and 0.47 V, indicating that the following cycles confirm the irreversible formation of SEI and polysulfide intermediates after the first cycle. In the first cathodic cycle of CuSe from Figure 3c, the reduction peak is located at 1.46 and 1.98 V due to the formation of Cu 2 Se and CuSe [22] . In addition, the presence of another cathodic peak at 1.11 V is due to the formation of Cu and Li 2 Se [23] .…”

Section: Resultsmentioning

confidence: 99%

Template Preparation of Copper‐Based Chalcogenides and their Electrochemical Performance for Li‐ion Batteries

et al. 2020

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Transition-Metal chalcogenides have high Li-ion storage capacity and considerable cycle performance, which has attracted great interest from researchers and is expected to replace graphite materials in the field of Li ion batteries. The purpose of this paper is to find a low-cost and ecofriendly method for producing copper-based chalcogenides as anodes with a high capacity and long cycling stability for lithium ion batteries. In our strategy, carbon nanospheres are used as templates to prepare precursor Cu(OH) 2 @C. Then, the Cu(OH) 2 @C is converted into copper-based chalcogenides by different routes. The structure and morphology of the as-synthesized materials is characterized by the X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The anode electrochemical performance of the samples was investigated by galvanostatic cycling (GC) vs. Li/Li + at different current rate. Compared to other copper chalcogenides, the synthesized copper oxide shows better charge/discharge cycle stability and rate performance. Its capacity retention is as high as 128 % at a current density of 0.5 C after 200 cycles.

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Section: Resultsmentioning

confidence: 99%

Template Preparation of Copper‐Based Chalcogenides and their Electrochemical Performance for Li‐ion Batteries

et al. 2020

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“…With continuous solvent evaporation, Cu 2−x Se nanorods will be formed via the self-assembly dissolutiongrowth of CuSe nanoplates. [13] The basic crystalline structure of cubic Cu 2−x Se adopting the F-43m space group is a rigid skeleton formed by Se atoms and disordered distributed Cu ions (Figure 1b). Moreover, the introduction of low-valence Cu is expected to not only provide empty cation sites for ions insertion but also enable Cu 2−x Se to be a p-type conductor with excellent electronic conductivity.…”

Section: Cumentioning

confidence: 99%

Mixed‐Valence Copper Selenide as an Anode for Ultralong Lifespan Rocking‐Chair Zn‐Ion Batteries: An Insight into its Intercalation/Extraction Kinetics and Charge Storage Mechanism

Yang

Xiao

Cai

et al. 2020

Adv Funct Materials

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Environment-friendly and low-cost aqueous zinc-ion batteries (ZIBs) have received considerable attention for large-scale energy storage. However, the low coulombic efficiency and potential safety hazards of Zn-metal anodes severely hinder their practical implementations. Herein, for the first time, mixed-valence Cu 2−x Se is proposed as a new intercalation anode to construct Zn-metal-free rocking-chair ZIBs with a long lifespan. It is found that the introduction of lowvalence Cu not only modify active sites for Zn 2+ ion storage, but also optimizes the electronic interaction between the active sites and the intercalated Zn 2+ ion, leading to a favorable intercalation formation energy (−0.68 eV) and reduced diffusion barrier, as demonstrated by first-principles calculation. Ex situ X-ray diffraction, ex situ transmission electron microscopy and galvanostatic intermittent titration technique measurements reveal the reversible insertion/extraction of Zn 2+ in Cu 2−x Se via an intercalation reaction mechanism. Owing to the rigid host structure and facile Zn 2+ diffusion kinetics, the Cu 2−x Se nanorod anode shows an enhanced coulombic efficiency (above 99.5%), outstanding rate capability and excellent cycling stability. The as-fabricated Zn x MnO 2 ||Cu 2−x Se Zn-ion full battery exhibits an impressive electrochemical performance, particularly an ultralong cycle life of over 20 000 cycles at 2 A g −1. This study is expected to provide new opportunities for developing high-performance rechargeable aqueous ZIBs.

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“…Figure 3e shows the CV curves of ZnSe@NC at different scan rates of 0.5, 0.7, 1.0, 2.0, and 4.0 mV s −1 , in which the peaks display a consistent variation trend along with the promoted scan rates, while a slight peak shift indicating low polarization degrees of ZnSe@NC in the electrolyte of tetraethylene glycol dimethyl ether and the coexistence of capacitance and diffusion Na + -ion storage behaviors. Based on the Trasatti analysis, Equations (1) and (2) are used to assess their capacitive contributions [48][49][50] i a…”

Section: Figure 3amentioning

confidence: 99%

Willow‐Leaf‐Like ZnSe@N‐Doped Carbon Nanoarchitecture as a Stable and High‐Performance Anode Material for Sodium‐Ion and Potassium‐Ion Batteries

Dong

et al. 2020

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cycling life and environmental benignity. However, the scarce (0.0017% in weight) and uneven distribution of lithium in the earth's crust limits the sustainable development of LIBs. [1-4] Therefore, it is necessary to explore alternative energystorage systems with the sufficient resource. Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) have the notable advantages due to the abundance of sodium (2.36 wt%) and potassium (2.09 wt%) in the earth's crust. [5-7] Meanwhile, SIBs and PIBs have similar electrochemical principles with that of LIBs. [8-10] Therefore, SIBs and PIBs have recently received considerable attention as the next-generation promising energy storage systems. However, the radii of Na + (1.02 Å) and K + (1.37 Å) are larger than that of Li + (0.76 Å), which can easily cause serious structure damage and sluggish kinetics of electrode material during the repeated Na + /K + intercalation/extraction processes. [11-13] The common anode materials (graphite, metal oxides) for LIBs suffer from low capacity for SIBs and PIBs. [14,15] Thus, it is desirable to fabricate the suitable electrode materials to alleviate the huge volume expansion during the charge/discharge processes. Recently, transition-metal selenides (TMDs, M = Co, Zn, Fe, V, Mo) have attracted significant attention as promising anode materials for SIBs and PIBs owing to their high theoretical capacity, low cost, and fascinating physicochemical properties. [16-20] Among them, zinc selenide (ZnSe) combining the conversion and alloying reactions is considered as a promising anode material owing to its high theoretical specific capacity, suitable discharge/charge platform, and low toxicity. [21,22] Nevertheless, as similar as other TMDs, the performance of ZnSe still suffers from low intrinsic conductivity and dramatic volume variation during the charge-discharge processes, which eventually result in poor cycling stability and rate performance, although obvious progresses have been made up to date. [23,24] To overcome these issues, some promising strategies have been explored to enhance the electrochemical performance. On one hand, incorporation of ZnSe within carbon matrix could improve the electronic conductivity and alleviate huge volume expansion. For example, ZnSe-reduced graphene oxide has been fabricated via a ZnSe is regarded as a promising anode material for energy storage due to its high theoretical capacity and environment friendliness. Nevertheless, it is still a significant challenge to obtain superior electrode materials with stable performance owing to the serious volume change and aggregation upon cycling. Herein, a willow-leaf-like nitrogen-doped carbon-coated ZnSe (ZnSe@NC) composite synthesized through facile solvothermal and subsequent selenization process is beneficial to expose more active sites and facilitate the fast electron/ion transmission. These merits significantly enhance the electrochemical performances of ZnSe@NC for sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs). The obtained ZnSe@NC exhib...

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Nanosheets‐Assembled CuSe Crystal Pillar as a Stable and High‐Power Anode for Sodium‐Ion and Potassium‐Ion Batteries

Cited by 198 publications

References 35 publications

Template Preparation of Copper‐Based Chalcogenides and their Electrochemical Performance for Li‐ion Batteries

Template Preparation of Copper‐Based Chalcogenides and their Electrochemical Performance for Li‐ion Batteries

Mixed‐Valence Copper Selenide as an Anode for Ultralong Lifespan Rocking‐Chair Zn‐Ion Batteries: An Insight into its Intercalation/Extraction Kinetics and Charge Storage Mechanism

Willow‐Leaf‐Like ZnSe@N‐Doped Carbon Nanoarchitecture as a Stable and High‐Performance Anode Material for Sodium‐Ion and Potassium‐Ion Batteries

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