还原氧化石墨烯改性铁掺杂磷酸钒锂正极材料
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- 英文论文题名：Reduced Graphene Oxide modified Fe-doped Li_3V_2(PO_4)_3 Cathode Material
- 论文作者：李振 ; 张露露 ; 杨学林 ; 丁晓凯 ; 周英贤 ; 孙华斌
- 英文论文作者：Z.Li ; L.L.Zhang ; X.L.Yang ; X.K.Ding ; Y.X.Zhou ; H.B.Sun ; College of Materials and Chemical Engineering ; China Three Gorges University
- 年：2016
- 作者机构：三峡大学材料与化工学院;
- 论文关键词：锂离子电池 ; 正极材料 ; 磷酸钒锂 ; 铁掺杂 ; 还原氧化石墨烯
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TM912;TB332
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：341k
- 原文格式：D
- 会议级别：全国
摘要
通过溶胶凝胶法成功制备出还原氧化石墨烯(rGO)改性铁掺杂磷酸钒锂复合正极材料Li_3V_(1.94)Fe_(0.06)(PO_4)_3/C@rGO。与Li_3V_2(PO_4)_3/C及Li_3V_2(PO_4)_3/C@rGO相比,该复合材料表现出最高的放电容量和最优的循环稳定性:2C下其初始放电容量高达159.9 mAh g~(-1),100次循环以后容量保持率为84.4%。该电极材料经小倍率循环后,再在5C下循环1000次后,仍能释放出129.3 mAh g~(-1)的容量,容量保持率高达91.5%,平均每次循环容量衰减仅0.0085%。Li_3V_(1.94)Fe_(0.06)(PO_4)_3/C@rGO复合材料优越的电化学性能可归因于铁掺杂和rGO改性的共同作用,这种双重改性更利于减小材料颗粒尺寸、提高电子电导率和增加锂离子扩散系数。我们相信,rGO改性掺杂材料的方法,对于Li_3V_2(PO_4)_3及其它任何聚阴离子型正极材料来说,都是推动并实现它们在动力锂离子电池中应用的一种有效途径。
Reduced graphene oxide(rGO) modified Fe-doped Li_3V_2(PO_4)_3/C cathode materials were successfully prepared by sol-gel method.Compared with Li_3V_2(PO_4)_3/C and rGO-incorporated Li_3V_2(PO_4)_3/C,the rGO-incorporated Li_3V_(1.94)Fe_(0.06)(PO_4)_3/C electrode behaves the highest initial capacity of 159.9 mAh g~(-1) with a capacity retention ratio of 84.4%after 100 cycles at 2 C.When cycled 1000 times at 5 C,it exhibits a prominent capacity of 129.3 mAh g~(-1) with a capacity retention ratio of 91.5%.The superior electrochemical performance of Fe-doped and rGO-incorporated Li_3V_2(PO_4)_3 can be contributed to the reduced particle size,the improved electronic conductivity,and the increased Li-ion diffusion coefficient.We believe that this novel co-modification with doping and rGO-incorporating is an efficient way for Li_3V_2(PO_4)_3 and other polyanion cathode materials to promote and realize their application in lithium ion battery.
Reduced graphene oxide(rGO) modified Fe-doped Li_3V_2(PO_4)_3/C cathode materials were successfully prepared by sol-gel method.Compared with Li_3V_2(PO_4)_3/C and rGO-incorporated Li_3V_2(PO_4)_3/C,the rGO-incorporated Li_3V_(1.94)Fe_(0.06)(PO_4)_3/C electrode behaves the highest initial capacity of 159.9 mAh g~(-1) with a capacity retention ratio of 84.4%after 100 cycles at 2 C.When cycled 1000 times at 5 C,it exhibits a prominent capacity of 129.3 mAh g~(-1) with a capacity retention ratio of 91.5%.The superior electrochemical performance of Fe-doped and rGO-incorporated Li_3V_2(PO_4)_3 can be contributed to the reduced particle size,the improved electronic conductivity,and the increased Li-ion diffusion coefficient.We believe that this novel co-modification with doping and rGO-incorporating is an efficient way for Li_3V_2(PO_4)_3 and other polyanion cathode materials to promote and realize their application in lithium ion battery.
引文
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