( 中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長沙 410083)
摘 要: 報(bào)道了用V2O5濕凝膠、 Li2CO3和Ag2CO3通過液相反應(yīng)合成用于鋰離子電池正極材料的Ag+-LiV3O8。其前驅(qū)體和產(chǎn)品分別利用熱分析(DTA-TG)、掃描電鏡(SEM)、 X射線衍射(XRD)、 紅外光譜(IR)技術(shù)進(jìn)行表征。 其電化學(xué)性能通過恒電流充放電、 循環(huán)伏安法和交流阻抗技術(shù)進(jìn)行研究。實(shí)驗(yàn)表明， 活性材料在不同的放電倍率和1.8~3.6V的電壓范圍內(nèi)具有較高的首次放電容量；在0.15C循環(huán)250次后保持180mAh/g的放電容量。
關(guān)鍵字: V2O5凝膠; Ag+-LiV3O8; 鋰離子電池; 正極材料
Ag+ doped lithium vanadium oxide
HOU Zhao-hui, DENG Ling-feng
（ School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: Ag+ doped LiV3O8 as a cathode material for lithium ion batteries was synthesized by solution reaction and low temperature calcination technique with V2O5 wet-gel, Li2CO3 and Ag2CO3 as raw materials. The precursor and product were characterized by differential thermalanalysis thermogravimetry(DTA-TG), scanning electron microsopy(SEM), X-ray diffraction(XRD), infrared spectroscopy(IR) measurements. Its electrochemical behavior as a cathode material for rechargeable lithium-ion batteries was studied by galvanostatic charge-discharge, cyclic voltammetry, and AC impedance technique. The experiment results show that the active material Ag+-LiV3O8 has higher first discharge capacity at various rates, and it maintains a discharge capacity of 180mAh/g at 0.15C rate over the voltage range of 1.8V-3.6V after 250 cycles.
Key words: V2O5 gel; Ag+-LiV3O8; lithium-ion batteries; cathode material
