| Li3V2(PO4)3的溶胶-凝胶合成及其性能研究 |
| Li3V2(PO4)3:Synthesis by Sol-gel Method and Performance |
| 作者 | 单位 | E-mail | | 戴长松 | 哈尔滨工业大学材料科学与工程博士后流动站, 哈尔滨, 150001
哈尔滨工业大学应用化学系, 哈尔滨, 150001 | | | 王福平 | 哈尔滨工业大学材料科学与工程博士后流动站, 哈尔滨, 150001 | pwang@hit.edu.cn | | 刘静涛 | 哈尔滨工业大学应用化学系, 哈尔滨, 150001 | | | 王殿龙 | 哈尔滨工业大学应用化学系, 哈尔滨, 150001 | | | 胡信国 | 哈尔滨工业大学应用化学系, 哈尔滨, 150001 | |
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| 摘要: 以LiOH·H2O(LiF、Li2CO3、LiCH3COO·2H2O)、NH4VO3、H3PO4和柠檬酸为原料,采用Sol-gel法合成锂离子电池正极材料Li3V2(PO4)3。优化了锂源、溶胶的pH值、预烧条件、煅烧温度等合成条件,并采用XRD、SEM、恒电流充放电及循环伏安试验等方法,研究了所合成的Li3V2(PO4)3的结构形貌和电化学性能。结果表明,以LiOH·H2O为锂源,溶胶的pH值等于3,于氩气氢气(体积比9:1)混合气中300℃预烧4h,并在氩气氢气(体积比9:1)混合气中600℃煅烧8h合成的Li3V2(PO4)3正极材料为标准的单斜结构,具有较高的放电比容量和较好的循环稳定性,0.1C和1C倍率下首次放电比容量分别为130mAh·g-1和129mAh·g-1;1C倍率下循环40次后,容量仍为127mAh·g-1,容量保持率为98.4%;随后又进行10C倍率放电,10次循环后容量为105mAh·g-1,容量保有率达98.1%。循环伏安测试表明,该正极材料具有较好的电化学可逆性。 |
| 关键词: 锂离子电池 正极材料 Li3V2(PO4)3 溶胶-凝胶法 |
| 基金项目: 中国博士后基金(No.20060400814);黑龙江省博士后基金(No.LBH-Z06080)资助项目 |
| Abstract: Cathode material Li3V2(PO4)3 was synthesized by Sol-gel method using appropriate amounts of LiOH·H2O (LiF,Li2CO3,LiCH3COO·2H2O),NH4VO3,H3PO4 and citric acid.Synthesized conditions including lithium sources,pH value of the sol,presintering conditions,and calcining temperature were optimized.Structure, morphology,and electrochemical performance of the synthesized materials were studied by XRD,SEM,charge- discharge tests and cycle voltammetry.The results show that Li3V2(PO4)3 prepared under the condition of LiOH· H2O as lithium source,pH value of 3 for the sol,presintering at 300℃ for 4 h follwed by heating at 600℃ for 8 h under Ar and H2(9:1,V/V)mixture atmosphere has typical monoclinic structure,better cycle stability,and high discharge capacity,which has 130 mAh·g-1 and 129 mAh·g-1 initial discharge capacity under 0.1C and 1C discharge rate,respectively,127 mAh·g-1 capacity after 40 cycles under 1C rate with 98.4% capacity retention and after the following 10 cycles under 10C rate still has 105 mAh·g-1 capacity with 98.1% capacity retention. Cycle voltammetry test shows that the Li3V2(PO4)3 material has better electrochemical reversibility. |
| Keywords: lithium ion batteries cathode material Li3V2(PO4)3 sol-gel method |
| 投稿时间：2007-09-10 修订日期：2007-12-04 |
| 摘要点击次数: 1268 |
| 全文下载次数: 1914 |
| 戴长松,王福平,刘静涛,王殿龙,胡信国.Li3V2(PO4)3的溶胶-凝胶合成及其性能研究[J].无机化学学报,2008,24(3):381-387. |
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