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- W2279680275 abstract "An intermetallic Cu6Sn5 of which theoretical capacity is 275 mAh g has been investigated as a promising alternative of graphite material as the anode of Li-ion batteries. We have developed a reduction-diffusion (RD) method to electrochemically form stoichiometric Cu6Sn5 and Cu3Sn, which are thermodynamically warranted: they can be obtained from elemental Cu under potential control in an ionic-liquid based bath (1-ethyl-3-methyl-imidazolium bis[(trifluoromethyl)sulfonyl]amide: EMI-Tf2N) containing Sn(II) ions [1]. Previously we report the electrochemical charge and discharge of stoichiometric Cu6Sn5 in the 1:1 solution of EC and DMC containing 1 mol dm LiPF6. As a result, Li2CuSn formed as an intermediate phase at +0.11 V vs. Li/Li, while at +0.00V vs. Li/Li separation into LixSn and Cu phases occurred; moreover, in the discharging process Cu6Sn5 reappeared without any additional phases, evidencing the reversibility of the Cu6Sn5 electrode [2]. In the present study we further investigated the electrochemical properties of the Cu3Sn and Cu6Sn5 prepared using the RD method. Cu6Sn5 and Cu3Sn layers were prepared on roughened epoxy substrates at +5 and +20 mV vs. Sn/Sn. Figure 1 shows the X-ray diffraction (XRD) profiles for Cu3Sn, charged at +0.00 V, +0.05 V, and +0.10 V vs. Li/Li. In all cases we did not observe the intermediate phase such as Li2CuSn, while we observed both LixSn and the unreacted Cu3Sn. These results suggest that in the charging process for Cu3Sn separation into LixSn and Cu from Cu3Sn directly occurred. Figure 2 demonstrates the charge-discharge tests for Cu6Sn5 at the current densities of 50 μAcm. The capacities were normalized with the mass of Cu6Sn5, which was determined from the ICP-AES results. The sample with a cutoff potential of (a) +0.20 V-1.50 V and (b) +0.11 V-1.50 V vs. Li/Li showed better cycle performance than that with (c) +0.00 V-1.50 V vs. Li/Li: the discharging capacities were almost flat up to about 20 cycle (110-160 mAh g in the case of (a) and 220-240 mAh g in the case of (b)), while in the case of (c) the capacity suddenly decreased at 9 cycle. Additionally, in (c) the capacity at below 10 cycle exceeded 275 mAh g (i.e. the theoretical capacity of Li2CuSn), which should be attributed to the separation into LixSn and Cu. Therefore, in the case of (a) and (b), separation from Li2CuSn to LixSn and Cu was suppressed to some extent, resulting in the relatively good cycle performance. Figure 1. XRD profiles of Cu3Sn (a) before charge and (b-d) after charge for 24 h at (b) +0.20 V (c) +0.10 V and (d) +0.11 V vs. Li/Li. The samples were covered with Mylar film for preventing oxidation." @default.
- W2279680275 created "2016-06-24" @default.
- W2279680275 date "2011-01-01" @default.
- W2279680275 modified "2023-09-26" @default.
- W2279680275 title "Electrochemical Lithiation and Delithiation of Stoichiometric Cu6Sn5 and Cu3Sn Prepared Using Reduction-Diffusion Method" @default.
- W2279680275 doi "https://doi.org/10.1149/ma2011-02/7/373" @default.
- W2279680275 hasPublicationYear "2011" @default.
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