应用化学
應用化學
응용화학
CHINESE JOURNAL OF APPLIED CHEMISTRY
2009年
10期
1236-1240
,共5页
锂离子电池%Li_(1+x)V_3O_8%超声波分散%固相合成
鋰離子電池%Li_(1+x)V_3O_8%超聲波分散%固相閤成
리리자전지%Li_(1+x)V_3O_8%초성파분산%고상합성
Li-ion batteries%Li_(1+x)V_3O_8%ultrasonic dispersal%solid-state reaction
以Li_2CO_3和NH_4VO_3为原料,在不同条件下合成了锂离子电池正极材料用Li_(1+x)V_3O_8. 研究了反应物的分散条件和煅烧温度对产物晶型结构、形貌及电化学性能的影响. XRD、IR和SEM结果表明,用超声波在无水乙醇中分散反应物得到的前驱体于550 ℃下煅烧,所得产物Li_(1+x)V_3O_8结晶度低、粒径小、形貌均匀. 充放电、循环伏安等结果表明,该材料在充放电过程中极化低、嵌脱锂位置多、循环稳定性好. 在0.5 C放电条件下,第2次循环放电容量达到268 mA·h/g,100次循环后容量仍保持210 mA·h/g以上.
以Li_2CO_3和NH_4VO_3為原料,在不同條件下閤成瞭鋰離子電池正極材料用Li_(1+x)V_3O_8. 研究瞭反應物的分散條件和煅燒溫度對產物晶型結構、形貌及電化學性能的影響. XRD、IR和SEM結果錶明,用超聲波在無水乙醇中分散反應物得到的前驅體于550 ℃下煅燒,所得產物Li_(1+x)V_3O_8結晶度低、粒徑小、形貌均勻. 充放電、循環伏安等結果錶明,該材料在充放電過程中極化低、嵌脫鋰位置多、循環穩定性好. 在0.5 C放電條件下,第2次循環放電容量達到268 mA·h/g,100次循環後容量仍保持210 mA·h/g以上.
이Li_2CO_3화NH_4VO_3위원료,재불동조건하합성료리리자전지정겁재료용Li_(1+x)V_3O_8. 연구료반응물적분산조건화단소온도대산물정형결구、형모급전화학성능적영향. XRD、IR화SEM결과표명,용초성파재무수을순중분산반응물득도적전구체우550 ℃하단소,소득산물Li_(1+x)V_3O_8결정도저、립경소、형모균균. 충방전、순배복안등결과표명,해재료재충방전과정중겁화저、감탈리위치다、순배은정성호. 재0.5 C방전조건하,제2차순배방전용량체도268 mA·h/g,100차순배후용량잉보지210 mA·h/g이상.
The anodic material of Li_(1+x)V_3O_8 was synthesized with Li_2CO_3 and NH_4VO_3 as the reactants under different conditions. The effects of the reactant dispersion and the calcining temperature on the structure, morphology and electrochemical properties of the products were investigated. XRD, IR and SEM experiments show that the sample synthesized at 550 ℃ from the precursor obtained with ultrasonically treating reactants in anhydrous ethanol has low crystallinity, small grain size and homogeneous morphology. And it has low polarization, more lithium insertion/extraction sites and good cyclability. Its discharge capacity reaches 268 mA·h/g in the 2nd cycle at a discharge rate of 0.5 C and still retains 210 mA·h/g after 100 cycles.
