S~(2-)掺杂Li_3V_2(PO_4)_3/C复合材料的制备及电化学性能研究
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- 英文论文题名：Synthesis and electrochemical property of S~(2-)-doped Li_3V_2(PO_4)_3/C composite as a cathode material for lithium-ion batteries
- 论文作者：莫璐璐 ; 李文娟 ; 吴海炼 ; 朱利敏 ; 曹晓雨
- 英文论文作者：Lulu Mo ; Wenjuan Li ; Hailian Wu ; Limin Zhu ; Xiaoyu Cao ; School of Chemistry and Chemical Engineering ; Henan University of Technology
- 年：2016
- 作者机构：河南工业大学化学化工学院;
- 英文论文关键词：Li_3V_2(PO_4)_3 ; S~(2-)-doping ; cathode material ; lithium-ion batteries
- 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
- 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：250k
- 原文格式：D
- 会议级别：全国
摘要
<正>单斜结构的Li_3V_2(PO_4)_3作为锂离子电池正极材料由于具备较高的理论容量,较高的工作电压和稳定的晶体结构等优点而备受关注~([1]),但其电子电导率偏低,在高倍率下的电化学性能不理想。常见的改性方法主要有碳包覆和离子掺杂,文献报道最多的是关于V~(3+)位的离子掺杂,而关于PO_4~(3-)阴离子的掺杂不多。基于此,我们通过溶胶-凝胶合成方法~([2]),采用S~(2-)部分取代PO_4~(3-)来实现阴离子掺杂,制备Li_3V_2(PO_4)_(3-x)S_x/C(LVPSC)
Monoclinic Li_3V_2(PO_4)_3 as a cathode material for lithium-ion batteries has attracted much attention because of its higher theoretical capacity,higher working voltage and good structural stability.However,the relatively low electronic conductivity of the Li_3V_2(PO_4)_3 material results in the poor rate capability.In order to solve this problem,various modified methods have been applied,such as carbon coating and ions substitution.Anion substitution has been less attempted,especially substituting for PO_4~(3-).Based on this,Li_3V_2(PO_4)_(3-x)S_x/C(LVPSC) cathode materials are synthesized by a simple and effective sol-gel method.The XRD studies showed that S~(2-)-doping sample is well crystallized and has no much difference from the pristine Li_3V_2(PO_4)_3/C(LVPC).At the same current density,the initial discharge capacity of LVPSC is 180.02 mAh g~(-1) and still remains 143.45 mAh g~(-1) after 100 cycles,indicating a higher initial discharge capacity and better cycling performance than the pristine LVPC.
Monoclinic Li_3V_2(PO_4)_3 as a cathode material for lithium-ion batteries has attracted much attention because of its higher theoretical capacity,higher working voltage and good structural stability.However,the relatively low electronic conductivity of the Li_3V_2(PO_4)_3 material results in the poor rate capability.In order to solve this problem,various modified methods have been applied,such as carbon coating and ions substitution.Anion substitution has been less attempted,especially substituting for PO_4~(3-).Based on this,Li_3V_2(PO_4)_(3-x)S_x/C(LVPSC) cathode materials are synthesized by a simple and effective sol-gel method.The XRD studies showed that S~(2-)-doping sample is well crystallized and has no much difference from the pristine Li_3V_2(PO_4)_3/C(LVPC).At the same current density,the initial discharge capacity of LVPSC is 180.02 mAh g~(-1) and still remains 143.45 mAh g~(-1) after 100 cycles,indicating a higher initial discharge capacity and better cycling performance than the pristine LVPC.
引文
[1]Jiang,T.;Wang,C.Z.;Chen,G.Solid State Ionics.2009,180(9-10):708-714.
[2]Chen,Q.Q.;Wang,J.M.;Tang,Z.Electrochim.Acta.2007,52(16):5251-5257.
[2]Chen,Q.Q.;Wang,J.M.;Tang,Z.Electrochim.Acta.2007,52(16):5251-5257.