纳米多孔铁掺杂钒氧化物电极材料的制备及其电化学性能  

Preparation and electrochemical properties of nanoporous Fe-doped vanadium oxide composite

作　　者：王威[1,2] 李萍 宗皊硕[1,2] WANG Wei;LI Ping;ZONG Ling-shuo(School of Textile Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China;School of Material Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]天津工业大学材料科学与工程学院,天津300387

出　　处：《天津工业大学学报》2019年第4期37-41,50,共6页Journal of Tiangong University

基　　金：天津市自然科学基金资助项目（16JCYBJC41700）;天津市教委科研计划项目（2017KJ075）

摘　　要：为了利用简单的生产工艺制备性能优异的锂离子电池负极材料,采用电弧熔炼-甩带的工艺制备出铁钒合金条带,再通过氧化还原方法成功制备出纳米多孔铁掺杂钒氧化物(Fe-VOx)复合材料,对材料物相和结构进行了表征,并且对比分析了在不同还原温度下纳米多孔Fe-VOx复合材料的电化学性能。结果表明:在还原温度为500 ℃、5% H2 /Ar混合气氛下,材料电化学性能最优,在电流密度为0.1 A/g下,初始放电比容量为563.4 mA·h/g,在循环100圈后的放电比容量仍能达到441 mA·h/g,循环容量保持率达到78.2%,远大于石墨的理论比容量372 mA·h/g。这说明纳米多孔铁掺杂钒氧化物复合材料能够有效提高锂离子电池的能量密度,并且具有良好的电化学性能。In order to prepare excellent anode materials for lithium-ion batteries by simple production process,Fe-V alloy ribbon were prepared by arc melting-stripping method,and nanoporous Fe-doped vanadium oxide (Fe-VOx) composites were successfully prepared by oxidation-reduction method and the structure and phase of the prepared meterial were cheracterized.The electrochemical properties of nanoporous Fe-VOx composite at different reduction temperature were investigated.The results showed that at the reduction temperature of 500 ℃ in 5% H2 /Ar atmosphere,the nanoporous Fe-VOx composite has higher specific capacity and rate capability compared with other samples,which delivers an initial discharge capacity of 563.4 mA·h/g and retains a capacity of 441 mA·h/g after 100 cycles and the retention rate of the cyclic capacity is over 78.2%,at 25 ℃ and a rate of 0.1 A/g.The theoretical specific capacity of nanoporous Fe-VOx composite is much larger than that of graphite of 372 mA·h/g,which indicates nanoporous Fe-VOx composite can effectively improve the energy density of lithium ion batteries and possess a good electrochemical performance.

关 键 词：电弧熔炼-甩带法 氧化还原 纳米多孔 Fe-VOx 电化学性能 锂离子电池 钒氧化物 

分 类 号：TQ138.11[化学工程—无机化工]