摘要
五氧化二钒(V_(2)O_(5))作为正极材料,在锂离子电池中存在循环不稳定、倍率性能差等缺点,且锂化机理研究有限,作为负极材料的研究更是缺乏。采用聚乙烯醇(PVA)辅助软模板溶剂热法制备多孔性V_(2)O_(5)(PVO),所得PVO的结晶度高,为相互连接的V_(2)O_(5)纳米棒组成的多孔结构。使用PVO为负极材料制备的半电池,容量和稳定性高,倍率性能较好,在放电过程中产生了新化合物,以0.2 A/g的电流在0.02~3.10 V充放电,第500次循环的放电比容量可达762.1 mAh/g。制备的LiFePO_(4)/PVO全电池以0.1 A/g的电流在1.5~3.5 V充放电,第100次循环的放电比容量为176.8 mAh/g。
Vanadium pentoxide(V_(2)O_(5))as a cathode material had some disadvantages such as cycle instability and poor rate capability in Li-ion batteries,the study of lithium mechanism was limited,while the study as anode material was even absent.Porous V_(2)O_(5)(PVO)was fabricated by a soft template solvothermal method assisted by polyvinyl alcohol(PVA).The PVO obtained had high crystallinity and was a porous structure composed of interconnected V_(2)O_(5) nanorods.The half-battery made with PVO as the anode material had high capacity and stability,good rate capability,new compounds were generated during the discharging process.The specific discharge capacity at the 500th cycle could reach 762.1 mAh/g at a current of 0.2 A/g when chargeddischarged in 0.02-3.10 V.When charged-discharged at a current of 0.1 A/g in 1.5-3.5 V,the specific discharge capacity of LiFePO_(4)/PVO full battery at the 100th cycle was 176.8 mAh/g.
作者
倪祥祥
胡习之
李长玉
NI Xiang-xiang;HU Xi-zhi;LI Chang-yu(School of Automobile and Traffic Engineering,Guangzhou City University of Technology,Guangzhou,Guangdong 510800,China;School of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou,Guangdong 510641,China)
出处
《电池》
CAS
北大核心
2023年第3期248-251,共4页
Battery Bimonthly
基金
广东省教育厅项目(2021GXJK105)。
