Recently, lithium secondary batteries have been used as power sources for various electronic devices, such as energy storage system, electric vehicles, cellular phones and computer notebooks. Research and development of lithium secondary batteries are in demand because of its high energy density, hi...
Recently, lithium secondary batteries have been used as power sources for various electronic devices, such as energy storage system, electric vehicles, cellular phones and computer notebooks. Research and development of lithium secondary batteries are in demand because of its high energy density, high capacity and relatively long cycle life.
LiCoO2 is the most widely used cathode material for commercial lithium secondary batteries because of its easy synthesis and good reversible capacity. However, cobalt is expensive and toxic. therefore, LiNiO2 has been studied as an alternative to cobalt use.
LiNiO2 has high specific capacity, low production cost, and low toxicity. Unfortunately, LiNiO2 has some drawbacks such as poor cycle life, low thermal stability, and cation mixing.
In order to overcome these problems, LiNi0.85Co0.15O2 have been developed, and metals such as Al, Cr, Fe and Mg have been used for partial substitution of Ni or Co to enhance the electrochemical performance of LiNi0.85Co0.15O2. Among these partial substitution, Al has attracted much attention. The Al-ion is electrochemically inactive during the charge-discharge process and the strong Al–O bond stabilizes the layered structure of LiNi0.85Co0.15O2. Nonetheless, Al-doped LiNi0.85Co0.15O2 (or LiNi0.8Co0.15Al0.05O2) has some drawbacks such as low thermal stability, unstable cycle life, and unsatisfactory rate capability.
In this study, Cu, Zn and Al added LiNi0.85Co0.15O2 cathode materials were synthesized using a solid-state route. The structure and electrochemical properties of Cu, Zn and Al added LiNi0.85Co0.15O2 were characterized by TGA, XRD, SEM, DSC and electrochemical test.
One of the Zn and Al doped samples, NC-Zn0.025Al0.025 showed the best discharge capacity among all the samples (at 0.1C-rate, 0.5C-rate, 5C-rate ; 182.2 mAh/g, 169.4 mAh/g, 104.2 mAh/g ) and showed better reversibility and higher cyclic stability compared with pristine LiNi0.85Co0.15O2.
Recently, lithium secondary batteries have been used as power sources for various electronic devices, such as energy storage system, electric vehicles, cellular phones and computer notebooks. Research and development of lithium secondary batteries are in demand because of its high energy density, high capacity and relatively long cycle life.
LiCoO2 is the most widely used cathode material for commercial lithium secondary batteries because of its easy synthesis and good reversible capacity. However, cobalt is expensive and toxic. therefore, LiNiO2 has been studied as an alternative to cobalt use.
LiNiO2 has high specific capacity, low production cost, and low toxicity. Unfortunately, LiNiO2 has some drawbacks such as poor cycle life, low thermal stability, and cation mixing.
In order to overcome these problems, LiNi0.85Co0.15O2 have been developed, and metals such as Al, Cr, Fe and Mg have been used for partial substitution of Ni or Co to enhance the electrochemical performance of LiNi0.85Co0.15O2. Among these partial substitution, Al has attracted much attention. The Al-ion is electrochemically inactive during the charge-discharge process and the strong Al–O bond stabilizes the layered structure of LiNi0.85Co0.15O2. Nonetheless, Al-doped LiNi0.85Co0.15O2 (or LiNi0.8Co0.15Al0.05O2) has some drawbacks such as low thermal stability, unstable cycle life, and unsatisfactory rate capability.
In this study, Cu, Zn and Al added LiNi0.85Co0.15O2 cathode materials were synthesized using a solid-state route. The structure and electrochemical properties of Cu, Zn and Al added LiNi0.85Co0.15O2 were characterized by TGA, XRD, SEM, DSC and electrochemical test.
One of the Zn and Al doped samples, NC-Zn0.025Al0.025 showed the best discharge capacity among all the samples (at 0.1C-rate, 0.5C-rate, 5C-rate ; 182.2 mAh/g, 169.4 mAh/g, 104.2 mAh/g ) and showed better reversibility and higher cyclic stability compared with pristine LiNi0.85Co0.15O2.
주제어
#리튬이차전지
#양극활물질
#LiNi0.85Co0.15O2
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