·552 北京科技大学学报 2003年第6期 的影响[D].北京：北京科技大学，2002 9 Yang S F,Song Y N,Ngala Katana,et al.Performance of 4 Yamada Atsuo,Kudo Yoshihiro,Liu K Y.Phase diagram LiFePO,as lithium battery cathode and comparison with of Li(Mn,Fe)PO(0<x,y<1)[J].J Electrochem Soc, manganese and vanadium oxides [J.J Power Sources, 2001,148:A1153 2003,119-121:239 5 Yamada Atsuo,Kudo Yoshihiro,Liu K Y.Reaction mech- 10 Higuchi Masashi,Katayama Keiichi,Azuma Yasuo.Syn- anism of the olivine-type Li,(MnoFes)PO [J].J Electro- thesis of LiFePO,cathode material by microwave process- chem Soc,,2001,148:A747 ing [J].J Power Sources,2003,119-121:258 6 Huang H,Yin S C,Nazar L F.Approaching theoretical ca- 11 Chen ZH,Dahn JR.Reducing carbon in LiFePO/Ccom- pacity of LiFePO,at room temperature at high rates [J]. posite electrodes to maximize specific energy,volumetric Electrochem Solid State Lett,2001(4):A170 energy,and tap density [J].J Electrochem Soc,2002,149 7 Andersson A S,Thomas J O.The source of first-cycle ca- (9):A1184 pacity loss in LiFePO.[J].J Power Sources,2001,97-98 12 PadhiA K,Nanjundaswamy KS,Goodenough JB.Phos- (1):498 pho-olivines as positive-electrode materials for recharge- 8 Croce F,Epifanio AD,Hassoun J,et al.A novel concept able lithium batteries [J].J Electrochem Soc,1997,144 for synthesis ofan improved LiFePO,lithium battery cath- (4):1188 ode [J].Electrochem Solid State Lett,2002,5(3):A47 Improving Electrochemical Performance of LiFePO,as a Cathode Material HU Huanyu,OIU Weihua,LI Faxi,ZHAO Hailei,WANG Biyan Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT LiFePO,was synthesized by solid state reaction.A reversible capacity of 125~138 mAh/g was achieved under a low current density of 20 mA/g at room temperature.In order to improve the electrochemical per- formance of the material,Li(FeMn2)PO,and LiFePO/C were prepared,respectively.The charge-discharge ex- periment of the samples showed that the capacities were 145 mAh/g and 144 mAh/g,respectively.They both had a good voltage plateau and exhibited wonderful high current properties. KEY WORDS lithium ion battery;positive electrode material;lithium iron phosphate. 552 . 北 京 科 技 大 学 学 报 2 00 3 年 第 6 期 的影 响 「D I . 北京 : 北 京科技大 学 , 2 002 . 4 Y匕I n a da A st u o , K u d o oY s hi hi r o , L i u K .Y hP as e d i司醉am o f L 礼(M玩F e 卜办P O式0簇x , 夕眨 l ) [J ] 、 J E l e e otr e he m Soc , 2 0 0 1 , 1 4 8 : A l l 5 3 5 、 乞m a d a A st u o , K u do Y b s h i hl r o , L i u K 丫 eR ac it o n m e e h - 耐 s m o f ht e o liv ine 曰 yt P e L 元(M l l 。正e 。力P 0 4 [月 . J E l e ctr o - e h em S o e , 2 0 0 1 , 1 4 8 : A 74 7 6 H u an g H , 叭n S C , N 山. r L E A p r o a e h in g ht e o ert i c ia e a - Pac iyt o f L IF e P 0 4 at r o om t e m P e r a tL 廿 e at in gh art e s [月 . E l . 由沈h e m S o l id S七n e L比 , 2 00 1( 4 ) : A 17 0 7 A n d e sr s on A S , hT om as J O . hT e s o u r c e o f 五sr -t c y c l e e a￾P朗iyt 1 0 5 5 in L 于 e p .o 闭 . J P o w e r S o u 比c e s , 2 0 0 1 , 9 7 一 9 8 ( l ) : 49 8 8 C or e e F, 即 iaf n i o A D , H as s o un J , et a l . 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I n o dr er t o im P r vo e ht e e l e e otr hc e m i e al P -er fo mr anc e o f ht e m aet ir ia , L i(F eo . . M n0 2 ) P O ; an d L IF e PO 扩C we er P r eP aer d , er s ep e it v e .ly hT e c h哩 e 一 d i s hc agr e ex - P e ir m e nt o f het s 剐叭 P le s s h o w e d t h at het e aP 解it e s wer 1 4 5 m A h/ g an d 1 4 m Ah/ g , er sP e c t i v e .ly hT ey b o ht h毗 a g o o d v o l agt e Pl aet au an d e hx lb i et d wo n de r fu l hi hg e翻汀 e n t P r o P e irt e s . K E Y W O R D S li ht i um ion b a t e yr ; Po s iit v e e l e e otr de m at ier a l: lit hi 叨 m ir o n Ph o s Ph a t e