摘要
Layered Li(Ni0.5Mn0.5)1-xMxO2 (M=Ti, Al; x=0, 0.02) cathode materials for lithium-ion batteries were synthesized by one step solid-state method using Ni(OH)2, MnCO3, Li2CO3, TiO2 and Al(OH)3 as starting materials. The effect of Ti and Al doping on the structure and electrochemical performance of Li(Ni0.5Mn0.5)1-xMxO2 (M=Ti, Al; x=0, 0.02) has been investigated. LiNi0.5Mn0.5O2, Li(Ni0.5Mn0.5)0.98Ti0.02O2 and Li(Ni0.5Mn0.5)0.98Al0.02O2 delivered 149 mAh·g-1, 160 mAh·g-1, 164 mAh·g-1, respectively, at a current of 20 mA·g-1 between 2.5 V and 4.3 V at room temperature, and remained 86%, 91%, 91% of the initial discharge capacity respectively after 30 cycles. AC impedance studies show that Ti and Al doping in Li(Ni0.5Mn0.5)1-xMxO2 (M=Ti, Al; x=0, 0.02) decreased the resistance of charge transfer Rct of cathode materials.
Layered Li（Ni0.5Mn0.5）1-xMxO2 （M=Ti, Al; x=0, 0.02） cathode materials for lithium-ion batteries were synthesized by one step solid-state method using Ni（OH）2, MnCO3, Li2CO3, TiO2 and Al（OH）3 as starting materials. The effect of Ti and Al doping on the structure and electrochemical performance of Li（Ni0.5Mn0.5）1-xMxO2 （M=Ti, Al; x=0, 0.02） has been investigated. LiNi0.5Mn0.5O2, Li（Ni0.5Mn0.5）0.98Ti0.02O2 and Li（Ni0.5Mn0.5）0.98Al0.02O2 delivered 149 mAh·g^-1, 160 mAh·g^-1 164 mAh·g^-1, respectively, at a current of 20 mA·g^-1 between 2.5 V and 4.3 V at room temperature, and remained 86%, 91%, 91% of the initial discharge capacity respectively after 30 cycles. impedance studies show that Ti and Al doping in Li（Ni0.5Mn0.5）1-xMxO2 （M=Ti, Al; x=0, 0.02） decreased resistance of charge transfer R, of cathode materials AC the
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2006年第8期1540-1544,共5页
Chinese Journal of Inorganic Chemistry
基金
中南大学博士后基金资助项目
