The volume expansion during Li ion insertion/extraction remains an obstacle for the application of Sn-based anode in lithium ion-batteries. Herein, the nanoporous (np) Cu6Sn5 alloy and Cu6Sn5/Sn composite were applied as a lithium-ion battery anode. The as-dealloyed np-Cu6Sn5 has an ultrafine ligament size of 40 nm and a high BET-specific area of 15.9 m2 g−1. The anode shows an initial discharge capacity as high as 1200 mA h g−1, and it remains a capacity of higher than 600 mA h g−1 for the initial five cycles at 0.1 A g−1. After 100 cycles, the anode maintains a stable capacity higher than 200 mA h g−1 for at least 350 cycles, with outstanding Coulombic efficiency. The ex situ XRD patterns reveal the reverse phase transformation between Cu6Sn5 and Li2CuSn. The Cu6Sn5/Sn composite presents a similar cycling performance with a slightly inferior rate performance compared to np-Cu6Sn5. The study demonstrates that dealloyed nanoporous Cu6Sn5 alloy could be a promising candidate for lithium-ion batteries.
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机译：Li离子插入/提取期间的体积膨胀仍然是在锂离子电池中施加Sn基阳极的障碍。这里，纳米多孔（NP）Cu6SN5合金和Cu6Sn5 / Sn复合物作为锂离子电池阳极施加。低氧化的NP-Cu6SN5具有40nm的超细韧带尺寸，并且高BET特异性面积为15.9m 2 G-1。阳极显示初始放电容量高达1200mA H G-1，并且对于0.1Ag-1的初始五个循环，它仍然高于600mA H G-1的容量。在100次循环之后，阳极保持高于200mA H G-1的稳定容量，至少350次循环，具有出色的库仑效率。 EX原位XRD模式显示CU6SN5和LI2CUSN之间的反相变换。与NP-CU6SN5相比，Cu6SN5 / Sn复合材料具有略微较差的速率性能的类似循环性能。该研究表明，易实纳米孔Cu6Sn5合金可以是锂离子电池的有希望的候选者。
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