Uniform core–shell Cu<sub>6</sub>Sn<sub>5</sub>@C nanospheres with controllable synthesis and excellent lithium storage performances

Su, Liwei; Fu, Jianghao; Zhang, Pinjie; Wang, Lianbang; Wang, Yuanhao; Ren, Manman

doi:10.1039/c7ra02214j

Cited by 14 publications

(7 citation statements)

References 54 publications

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“…During the conversion process, the insertion process of Cu–Sn/Cu–Zn metal alloys seems take place at lower potential region. Because the formation of Li 4.4 Sn has been proposed in the previous study, , some XRD peaks with weak intensity could be associated with the Li 22 Sn 5 structure.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Areal Capacity and Stability of Cu₂ZnSnS₄ Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation

Venugopal

Syum

et al. 2022

ACS Omega

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The widespread use of energy storage technologies has created a high demand for the development of novel anode materials in Li-ion batteries (LIBs) with high areal capacity and faster electron-transfer kinetics. In this work, carbon-coated Cu 2 ZnSnS 4 with a hierarchical 3D structure (CZTS@C) is used as an anode material for LIBs. The CZTS@C microstructures with enhanced electrical conductivity and improved Li-ion diffusivity exhibit high areal and gravimetric capacities of 2.45 mA h/cm 2 and 1366 mA h/g, respectively. The areal capacity achieved in the present study is higher than that of previously reported CZTS-based materials. Moreover, in situ X-ray diffraction results show that lithium ions are stored in CZTS through the insertion reaction, followed by the alloying and conversion reactions at ∼1 V. The structural evolution of Li 2 S and Cu–Sn/Cu–Zn alloy phases occurs during the conversion and alloying reactions. The present work provides a cost-effective and simple method to prepare bulk CZTS and highlights the conformal carbon coating over CZTS, which can enhance the electrical and ionic conductivities of CZTS materials and increase the mass loading (1–2.3 mg/cm 2 ). The improved stability and rate capability of CZTS@C anode materials can therefore be achieved.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Areal Capacity and Stability of Cu₂ZnSnS₄ Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation

Venugopal

Syum

et al. 2022

ACS Omega

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“…This is because of the reduction in the degree of volume change due to the decrease in Sn content, and the smaller particle size of Sn-Cu alloy because of the suppression of growth of Sn particles during synthesis. It is also believed that the Cu matrix of the Cu 6 Sn 5 intermetallic works more effectively against electrode pulverization caused by the volume change [16][17][18][19][20].…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Performances of the Sn-Cu Alloy Negative Electrode Materials through Simple Chemical Reduction Method

Kim

Chae

et al. 2019

J. Electrochem. Sci. Technol

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Sn-Cu alloy powders were prepared via a simple chemical reduction method for the negative electrode materials in lithiumion batteries. The addition of Cu can suppress the growth of Sn particles during synthetic process. Furthermore, the Cu also acts as a matrix phase against the volume change during cycling. With increasing amount of the Cu, a stable Cu 6 Sn 5 phase formed in the Sn-Cu alloy and its cycle performance greatly enhanced depending on the Cu content. To promote the generation of the Cu 6 Sn 5 phase, the synthesis temperature is raised to 60-100 o C from the ambient temperature. The Sn-Cu alloy powders prepared at elevated temperatures showed remarkable cycle performances. The Sn-Cu alloy powder obtained at 60 o C exhibited a significantly high volumetric capacity of over 2,000 mAh/cc at the 50th cycle.

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“…Consistent with the CV plots, during the first discharge step, a small voltage plateau at about 1.4 V was indicative of the formation of SEI film. The two obvious slope platforms located at 0.6 V and 0.1 V are associated with the alloying process of Cu 6 Sn 5 to Li 2 CuSn and Li 2 CuSn to Cu 6 Sn 5 , respectively [ 26 , 32 , 33 ]. After the first cycle, the voltage plateau becomes two sloped regions, which indicates the occurrence of structure recombination.…”

Section: Resultsmentioning

confidence: 99%

Integrated Anode Electrode Composited Cu–Sn Alloy and Separator for Microscale Lithium Ion Batteries

Jiang

Yang

2019

Materials

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A novel integrated electrode structure was designed and synthesized by direct electrodepositing of Cu–Sn alloy anode materials on the Celgard 2400 separator (Cel-CS electrode). The integrated structure of the Cel-CS electrode not only greatly simplifies the battery fabrication process and increases the energy density of the whole electrode, but also buffers the mechanical stress caused by volume expansion of Cu–Sn alloy active material; thus, effectively preventing active material falling off from the substrate and improving the cycle stability of the electrode. The Cel-CS electrode exhibits excellent cycle performance and superior rate performance. A capacity of 728 mA·h·g−1 can be achieved after 250 cycles at the current density of 100 mA·g−1. Even cycled at a current density of 5 A·g−1 for 650 cycles, the Cel-CS electrode maintained a specific capacity of 938 mA·h·g−1, which illustrates the potential application prospects of the Cel-CS electrode in microelectronic devices and systems.

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Uniform core–shell Cu₆Sn₅@C nanospheres with controllable synthesis and excellent lithium storage performances

Abstract: Well-proportioned PANI-derived carbon shells effectively limit the agglomeration of Cu6Sn5 nanocores and hence present extraordinary lithium storage performances.

Cited by 14 publications

References 54 publications

Enhancing the Areal Capacity and Stability of Cu₂ZnSnS₄ Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation

Enhancing the Areal Capacity and Stability of Cu₂ZnSnS₄ Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation

Electrochemical Performances of the Sn-Cu Alloy Negative Electrode Materials through Simple Chemical Reduction Method

Integrated Anode Electrode Composited Cu–Sn Alloy and Separator for Microscale Lithium Ion Batteries

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Uniform core–shell Cu6Sn5@C nanospheres with controllable synthesis and excellent lithium storage performances

Abstract: Well-proportioned PANI-derived carbon shells effectively limit the agglomeration of Cu6Sn5 nanocores and hence present extraordinary lithium storage performances.

Cited by 14 publications

References 54 publications

Enhancing the Areal Capacity and Stability of Cu2ZnSnS4 Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation

Enhancing the Areal Capacity and Stability of Cu2ZnSnS4 Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation

Electrochemical Performances of the Sn-Cu Alloy Negative Electrode Materials through Simple Chemical Reduction Method

Integrated Anode Electrode Composited Cu–Sn Alloy and Separator for Microscale Lithium Ion Batteries

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Uniform core–shell Cu₆Sn₅@C nanospheres with controllable synthesis and excellent lithium storage performances

Enhancing the Areal Capacity and Stability of Cu₂ZnSnS₄ Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation

Enhancing the Areal Capacity and Stability of Cu₂ZnSnS₄ Anode Materials by Carbon Coating: Mechanistic and Structural Studies During Lithiation and Delithiation