Co-sputtering Sn-Al/Cu Composite Thin Films as Anode Materials of Li-ion Batteries†

doi:10.7503/cjcu20140313

Abstract

Abstract:

Sn-Al/Cu composite thin films with planar and three dimensional(3D) network structures, which were prepared by co-sputtering method on copper foil or foam, were used as the anode materials of Li-ion batteries. The phase structure and surface morphology of Sn-Al composite thin films were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The electrochemical performance of Sn-Al composite thin films was evaluated with charge/discharge and electrochemical impedance spectroscopy(EIS) at room temperature. The results showed that Sn-Al composite thin films with 3D network structure displayed a capacity of 410 mA·h/g after 50 cycles at a current density of 600 mA/g, and a capacity of 464 mA·h/g at a current density of 2000 mA/g. The improved electrochemical performance such as cycling stability and columbic efficiency is attributed to the 3D network structure, which can obviously restrain the volume change of Sn-Al composite thin film during the insertion/extraction process of lithium ion. In addition, copper foam with large specific surface area and rough surface can promote the reaction with lithium sufficiently.

Key words: Sn-Al composite thin film, Co-sputtering, 3D network structure, Li-ion battery, Anode

CLC Number:

TrendMD:

WEI Lin, WANG Lixiu, TAO Zhanliang, CHEN Jun. Co-sputtering Sn-Al/Cu Composite Thin Films as Anode Materials of Li-ion Batteries^†[J]. Chem. J. Chinese Universities, 2014, 35(11): 2425.

Figures/Tables 8

Fig.1 XRD patterns of Sn-Al composite thin films deposited on copper foil(a) and copper foam(b)(A) and glass(B)

Fig.2 EDS of Sn-Al composite thin film

Fig.3 SEM images of copper foil(A), copper foam(B) and Sn-Al composite thin films on the copper foil(C) and copper foam(D)

Fig.4 First and second charge-discharge curves of Sn-Al composite thin films on copper foil(dash line) and copper foam(solid line)

Fig.5 Charge-discharge capacity and columbic efficiency as a function of cycle number for the Sn-Al composite thin films on different substrates

Fig.6 SEM images of Sn-Al composite thin films on copper foil(A) and copper foam(B) after 50 cycles Inset of (B) is the larger magnification image of the film on copper foam.

Fig.7 EIS plots of Sn-Al composite thin films on copper foil(A) and copper foam(B) in the delithiated state after different cycles

Fig.8 Charge-discharge capacity as a function of cycle number for the Sn-Al composite thin films at different current density with a cut-off voltage of 0.01—2 V

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