532· 北京科技大学学报 2002年第5期 Influence of Ni/Co Ratio for LiCo,Ni-O2 on Electrochemical Performance OIU Weihua,LIN Chuangang,LI Zhimin,LU Zhongqin,HU Huanyu,HONG Jialing Laboratory on Solid State Ionics,UST Beijing,Beijing 100083,China ABSTRACT A series of LiNi-,Co,O2 (0<xs1)were synthesized by solid state reaction.The effect of Co" substitution on Ni"content was investigated by XRD and electrochemical techniques.It is shown that LiNioCoo2O2 has the best electrochemical performance,delivering specific capacities of 170-180 mAh/g and good over-charge resistance compared with LiNiO2. KEY WORDS lithium ion battery;positive electrode material;electrochemical performance 本孝米茶茶杂*素本茶茶衣本泽旅本★雀本涤本米茶浓本海米亲本泰米资茶本茶本茶案来率常米本海本诈章茶海泰率鉴泰本孝春本本姿本条米本本海春本茶套春本紫来本泽紫泰本※率本率奉 (上接第513页) Solid-Solution Effect on Microstruture of Inconel690 Superalloy ZHU Hong,DONG Jianxin,ZHANG maicang,HU Yaohe,XIE Xishan High Temperature Materials Research Laboratory,UST Beijing,Beijing 100083,China ABSTRACT The influence of solid-solution temperature on hardness,grain size and precipitate behavior was investigated in order to obtain the definite range of the solid-solution process.It is shown that the solid- solution temperature has a relatively obvious effect on the hardness,a great effect on the grain size in Inco- nel690 alloy.When the temperature is over 1070C,the grain size increases remarkably.The theoretical com- putation and SEM show that (Fe,Cr,Ni)aCs carbide in Inconel690 dissolves completely at temperatures of 1070~1090℃. KEY WORDS Inconel690;solid solution;microstructure一 北 京 科 技 大 学 学 报 年 第 期 一 肠 ， 力 ， ， 口月 呀， ， ， 万 扮 ， 习卿 ， ，一 ‘ ‘ 勿 ， ， 而 ， 于 一 刀 上接第 页 一 乙仔 ， ， 咬刃 ， ， 尤您 茉污 介 ， ， ， 一 叮 ， 一 ， ℃ ， ， ， 。 卫 ℃ 如 妞