片状LiV3O8软模板辅助溶胶-凝胶法制备及其在水系锂离子电池中的性能研究

Preparation and Electrochemical Properties of Flake-Like LiV_3O_8 by Soft Template Assisted Sol-Gel Method as Anode Material for Aqueous Li-Ion Battery

负极材料是目前制约水溶液锂离子电池的关键.采用十二烷基苯磺酸钠软模板辅助的溶胶凝胶法制备了片状LiV3O8材料.XRD和SEM测试表明,目标材料为纯相的片状结构LiV3O8,属单斜晶系,P21/m点群.组装LiMn2O4//Li2SO4//LiV3O8水溶液锂离子电池,测试发现片状LiV3O8具有较高的倍率性能和较好的循环寿命.在0.1C下,LiV3O8的放电比容量为154 mAh·g-1.在1C、5C和10C时,放电容量分别为134 mAh·g-1、78 mAh·g-1和54 mAh·g-1.1C前170周循环的容量保持率约60%.

Anode material has become the key issue for restricting the development of aqueous lithium ion battery（ALIB）. Flake-like LiV3 O8 materials were synthesized by sol-gel method using sodium dodecyl benzene sulfonate（SDBS） as a template. The XRD and SEM results showed that as-prepared flake-like LiV3 O8 was of high purity with monoclinic system and P21 /m space group. LiMn2 O4 // Li2 SO4 //Li V3 O8 ALIB was assembled and tested. As observed, the flake-like Li V3 O8 here exhibited good high-rate performance and cycling stability. A high discharge capacity of 154 mAh·g^-1（based on the mass of negative electrode） was delivered at 0.1C（1C=300 mA·g^-1）. At 1C, 5C and 10C rates, the reversible discharge capacities of 134 mAh·g^-1, 78 mAh·g^-1and 54 mAh·g^-1were retained, respectively. More importantly, the capacity retention after 170 cycles at 1C was about 60%.