CAJ | 학술논문

采用固相烧结合成 Sn0．4 Co0．4 Zn0．2合金,再以H2 SO4进行酸腐蚀,探索了 H2 SO4浓度对合金结构和电化学性能的影响.实验结果表明,Sn0．4 Co0．4-Zn0．2合金由CoSn、Co3 Sn2、CoSn2相和单质Zn组成,H2 SO4使合金中部分Zn腐蚀溶解,在颗粒内部形成孔隙,并且使颗粒内部失去粘结而粉化,颗粒细化变小.酸腐蚀改善了Sn0．4 Co0．4 Zn0．2合金的电化学性能,当 H2 SO4浓度为0．02 mol/L时,合金的首次放电容量为295 mAh/g,经过100次循环后的放电容量为234 mAh/g,保持了首次放电容量的79．3％,表现出良好的电化学活性.
채용고상소결합성 Sn0．4 Co0．4 Zn0．2합금,재이H2 SO4진행산부식,탐색료 H2 SO4농도대합금결구화전화학성능적영향.실험결과표명,Sn0．4 Co0．4-Zn0．2합금유CoSn、Co3 Sn2、CoSn2상화단질Zn조성,H2 SO4사합금중부분Zn부식용해,재과립내부형성공극,병차사과립내부실거점결이분화,과립세화변소.산부식개선료Sn0．4 Co0．4 Zn0．2합금적전화학성능,당 H2 SO4농도위0．02 mol/L시,합금적수차방전용량위295 mAh/g,경과100차순배후적방전용량위234 mAh/g,보지료수차방전용량적79．3％,표현출량호적전화학활성.
The Sn0.4 Co0.4 Zn0.2 alloy was synthesized using solid-state sintering and then treated by etching,and the influence of H2 SO4 concentration on the structures and electrochemical properties were analyzed.Analysis results showed that Sn0.4 Co0.4 Zn0.2 alloy consists of CoSn,Co3 Sn2 ,CoSn2 phase and zinc simple substance.Part of zinc was corrosion dissolved by H2 SO4 ,which leads to the formation of many pores in the particle interior and the decreasing of size of particle of Sn0.4 Co0.4 Zn0.2 alloy.Etching improved the electrochemical properties of Sn0.4 Co0.4 Zn0.2 alloy.When the H2 SO4 concentration was 0.02 mol/L,the initial discharge capacity of Sn0.4 Co0.4 Zn0.2 alloy was 295 mAh/g, the retention after 100 cycles retains 79.3%, which showed the Sn0.4 Co0.4 Zn0.2 alloy has good electrochemical properties.