锂离子电池用Sn-Ni合金负极的研究

Study of Sn-Ni alloy as negative electrode for lithium-ion batteries

以机械合金法制备了Sn Ni合金粉,并对合金电极的电化学性能进行了研究。结果发现:当合金的颗粒度小到纳米级,团聚现象很明显,但它对合金电极循环性能没有太大的影响;电极的热处理温度在200℃以下对电极的循环性能提高没有多大作用,而经300℃热处理2h的电极具有良好的循环性能;电极压制的压力对电极的循环性能有不同的影响,经5MPa压制的电极循环性能最好。

Electrochemical properties of Sn-Ni alloy powder prepared by mechanical alloying were examined as negative electrode for lithium-ion batteries. When the size of alloy powder was decreased to nanometer level, alloy powder would reunite into large particles which had little effect on the cycle performance of the electrode. To obtain the well-developed Sn-Ni phase, the sample was heat-treated. The alloy powder heat-treated at 200?℃ for 2?h under argon flow did not show excellent cycle performance, however, the discharge capacity of the sample heat treated at 300?℃ for 2?h under argon atmosphere was improved and low capacity fading was observed.Furthermore, electrodes pressed under different pressures had different effect on cycle performance.The electrode which was pressed under 5?MPa had the best cycle performance.