3DOM SnO2-SiO2锂离子电池负极材料的制备及电化学性能

针对SnO2锂离子电池负极材料长循环性能差的缺点,把非晶SiO2引入SnO2材料中,形成SnO2-SiO2纳米复合材料。采用聚苯乙烯(PS)胶晶作为模板,制备出三维有序大孔SnO2-SiO2纳米复合材料。研究结果表明,3DOM SnO2材料晶体结构和3DOM SnO2-SiO2材料相似,但是加入SiO2以后,3DOM SnO2-SiO2材料的长循环性能得到显著提高。在500 mAh/g的电流密度下循环100次,此时加0%Si的3DOM SnO2-SiO2材料的充电比容量急剧衰减为147 mAh/g,加5%Si的3DOM SnO2-SiO2材料的充电比容量达654 mAh/g,此外500次循环后加5%Si的3DOM SnO2-SiO2材料充电比容量增至728 mAh/g。这些结果表明SiO2能够改善3DOM SnO2材料长循环稳定性。

Preparation and electrochemical performance ofthree-dimensional ordered macroporousSnO2-SiO2 lithium ion battery anode materials

Aiming at the shortcomings of poor long-cycle performance of SnO2 lithium ion battery anode materials,amorphous SiO2 is introduced into SnO2 material to form SnO2-SiO2 nanocomposites.Three-dimensional ordered macroporous SnO2-SiO2 nanocomposites are prepared by using polystyrene(PS)colloid as a template.The results show that the crystal structure of 3DOM SnO2 material is similar to that of 3DOM SnO2-SiO2 material,but the long cycle performance of 3DOM SnO2-SiO2 material is significantly improved after adding SiO2.Cycling 100 times at a current density of 500 mAh/g,at which time the charge specific capacity of the 3DOM SnO2-SiO2 material with 0%Si is sharply attenuated to 147 mAh/g,and the charge capacity of the 3DOM SnO2-SiO2 material with 5%Si is added,the capacity is 654 mAh/g,and the charge capacity of the 3DOM SnO2-SiO2 material with 5%Si added after 500 cycles is increased to 728 mAh/g.These results indicate that SiO2 can improve the long cycle stability of 3DOM SnO2 materials.