锡镍合金的制备及电化学性能

作为锂离子电池用非碳类负极材料,合金或金属间化合物备受关注.合金材料在循环过程中的体积变化是一个致命缺点.从抑制体积变化的角度出发,根据"Buffer Matrix"的概念,将活性相植入到非活性相载体中.镍作为非活性相,锡作为活性相,用不同的方法制备了非晶态锡镍合金和晶态锡镍合金(Ni3Sn),研究了其形貌特征、晶体结构及电化学性能.在高温下用氢气还原的Ni3Sn具有稳定的晶体结构、较高的比容量(300mAh/g)和优良的循环性能.

Preparation and electrochemical performance of Ni-Sn alloys

As a carbon alternative anode material for Li-ion battery, alloys or inter-metal compounds were focused intensively.The alloy materials had a fatal disadvantage that the volume swelling existed during the cycles.The active materials embedded in inactive carrier based on the concept of "Buffer Matrix" to restrain the volume swellings. Ni as an inactive phase and Sn as an active phase, amorphous Ni-Sn alloy and crystalline Ni_3Sn were synthesized employing different methods which led to different morpho-(logy.) The morphology characteristics, crystal structures and electrochemical performance of the materials were investigated.Ni_3Sn reduced by H_2 at high temperature had a stable crystal structure,higher specific capacity (300 mAh/g) and excellent cycle performance.