ASE Korea

Gyeonggi do, South Korea

ASE Korea

Gyeonggi do, South Korea
SEARCH FILTERS
Time filter
Source Type

Song M.Y.,Chonbuk National University | Rim H.,ASE Korea | Park H.R.,Chonnam National University
Ceramics International | Year: 2013

Cathode materials with a composition of LiNi0.5Co 0.5O2 were synthesized by a solid-state reaction method at 850 °C using Li2CO3, NiO or NiCO3, and CoCO3 or Co3O4, as the sources of Li, Ni, and Co, respectively. Electrochemical properties, structure, and microstructure of the synthesized LiNi0.5Co0.5O2 samples were analyzed. The curves of voltage vs. x in LixNi0.5Co 0.5O2 for the first charge-discharge and the intercalated and deintercalated Li quantity Δx were studied. The destruction of unstable 3b sites and phase transitions are discussed from the first and second charge-discharge curves of voltage vs. x in LixNi 0.5Co0.5O2. The LiNi0.5Co 0.5O2 sample synthesized from Li2CO 3, NiO, and Co3O4 has the largest first discharge capacity (159 mAh/g), with a discharge capacity deterioration rate of 5.8 mAh/g/cycle. © 2013 Elsevier Ltd and Techna Group S.r.l.


Rim H.,ASE Korea | Park H.R.,Chonnam National University | Song M.Y.,Chonbuk National University
Ceramics International | Year: 2012

LiNi 1-yCo yO 2 (y = 0.1, 0.3 and 0.5) were synthesized by solid state reaction method at 800 °C and 850 °C from Li 2CO 3, NiO and CoCO 3 as starting materials. The electrochemical properties of the synthesized LiNi 1-yCo yO 2 were investigated. As the content of Co decreases, particle size decreases rapidly and particle size gets more homogeneous. When the particle size is compared at the same composition, the particles synthesized at 850 °C are larger than those synthesized at 800 °C. Among LiNi 1-yCo yO 2 (y = 0.1, 0.3 and 0.5) synthesized at 850 °C, LiNi 0.7Co 0.3O 2 has the largest intercalated and deintercalated Li quantity Δx at the first charge-discharge cycle, followed in order by LiNi 0.9Co 0.1O 2 and LiNi 0.5Co 0.5O 2. LiNi 0.7Co 0.3O 2 synthesized at 850 °C has the largest first discharge capacity (142 mAh/g), followed in order by LiNi 0.9Co 0.1O 2 synthesized at 850 °C (113 mAh/g), and LiNi 0.5Co 0.5O 2 synthesized at 800 °C (109 mAh/g). © 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Song M.Y.,Chonbuk National University | Rim H.,ASE Korea | Park H.R.,Chonnam National University
Ceramics International | Year: 2012

LiNi 1-yCo yO 2 (y=0.1, 0.3 and 0.5) were synthesized by solid state reaction method at 800 °C and 850 °C from LiOH·H 2O, NiO and Co 3O 4 as starting materials. The electrochemical properties of the synthesized LiNi 1-yCo yO 2 were investigated. As the content of Co decreases, particle size decreases rapidly and particle size distribution gets more homogeneous. When the particle size is compared at the same composition, the particles synthesized at 850 °C are larger than those synthesized at 800 °C. LiNi 0.7Co 0.3O 2 synthesized at 850 °C has the largest intercalated and deintercalated Li quantity Δx among LiNi 1-yCo yO 2 (y=0.1, 0.3 and 0.5). LiNi 0.7Co 0.3O 2 synthesized at 850 °C has the largest first discharge capacity (178 mAh/g), followed by LiNi 0.7Co 0.3O 2 (162 mAh/g) synthesized at 800 °C. LiNi 0.7Co 0.3O 2 synthesized at 800 °C has discharge capacities of 162 and 125 mAh/g at n=1 and n=5, respectively. © 2012 Elsevier Ltd and Techna Group S.r.l.


Rim H.,ASE Korea | Ryoung Park H.,Chonnam National University | Youp Song M.,Chonbuk National University
Ceramics International | Year: 2013

Cathode active materials with a composition of LiNi0.9Co 0.1O2 were synthesized by a solid-state reaction method at 850°C using Li2CO3, NiO or NiCO3, and CoCO3 or Co3O4, as the sources of Li, Ni, and Co, respectively. Electrochemical properties, structure, and microstructure of the synthesized LiNi0.9Co0.1O2 samples were analyzed. The curves of voltage vs. x in LixNi0.9Co 0.1O2 for the first charge-discharge and the intercalated and deintercalated Li quantity Δx were studied. The destruction of unstable 3b sites and phase transitions were discussed from the first and second charge-discharge curves of voltage vs. x in LixNi 0.9Co0.1O2. The LiNi0.9Co 0.1O2 sample synthesized from Li2CO 3, NiO, and Co3O4 had the largest first discharge capacity (151 mA h/g), with a discharge capacity deterioration rate of -0.8 mA h/g/cycle (that is, a discharge capacity increasing 0.8 mA h/g per cycle). © 2013 Elsevier Ltd and Techna Group S.r.l.


Rim H.,ASE Korea | Ryoung Park H.,Chonnam National University | Youp Song M.,Chonbuk National University
Ceramics International | Year: 2013

LiNi1-yCoyO2 (y=0.1, 0.3 and 0.5) cathode materials were synthesized by a solid-state reaction method at different temperatures using Li2CO3 as a Li source, NiCO3 as a Ni source, and Co3O4 as a Co source. The electrochemical properties of the synthesized samples were then investigated. Structures of the synthesized LiNi1-yCoyO2 (y=0.1, 0.3 and 0.5) samples were analyzed, and microstructures of the samples were observed. Voltage vs. x in LixNi1-yCo yO2 curves for the first and second charge-discharge cycles and intercalated and deintercalated Li quantity Δx were studied. LiNi0.9Co0.1O2 synthesized at 800 °C had the largest first discharge capacity (152 mAh/g) and quite good cycling performance, with a discharge capacity of 146 mAh/g at n=5. It had a discharge capacity fading rate of 1.4 mAh/g/cycle. © 2012 Elsevier Ltd and Techna Group S.r.l.


Song M.Y.,Chonbuk National University | Rim H.,ASE Korea | Park H.R.,Chonnam National University | Mumm D.R.,University of California at Irvine
Ceramics International | Year: 2013

LiNi1-yCoyO2 (y=0.1, 0.3, and 0.5) were synthesized by a solid-state reaction method at 800 °C and 850 °C using Li2CO3, NiO, and Co3O4 as the starting materials. The electrochemical properties of the synthesized LiNi 1-yCoyO2 were then investigated. For samples with the same composition, the particles synthesized at 850 °C were larger than those synthesized at 800 °C. The particles of all the samples synthesized at 850 °C were larger than those synthesized at 800 °C. LiNi0.5Co0.5O2 synthesized at 850 °C had the largest first discharge capacity (159 mA h/g), followed in order by LiNi0.7Co0.3O2 synthesized at 800 °C (158 mA h/g) and LiNi0.9Co0.1O2 synthesized at 850 °C (151 mA h/g). LiNi0.9Co0.1O2 synthesized at 850 °C had the best cycling performance with discharge capacities of 151 mA h/g at n=1 and 156 mA h/g at n=5. © 2012 Elsevier Ltd and Techna Group S.r.l.


Song M.Y.,Chonbuk National University | Rim H.,ASE Korea | Park H.R.,Chonnam National University
Ceramics International | Year: 2013

Cathode active materials with a composition of LiNi0.9Co 0.1O2 were synthesized by a solid-state reaction method at 800 C using Li2CO3, NiO or NiCO3, and CoCO3 or Co3O4 as the sources of Li, Ni, and Co, respectively. The electrochemical properties of the synthesized samples were then investigated. The structure of the synthesized LiNi0.9Co 0.1O2 was analyzed, and the microstructures of the samples were observed. The curves of voltage vs. x in LixNi 0.9Co0.1O2 for the first charge-discharge and the intercalated and deintercalated Li quantity Δx were studied. The LiNi0.9Co0.1O2 sample synthesized from Li 2CO3, NiCO3, and Co3O4 had the largest first discharge capacity (152 mAh/g), with a discharge capacity deterioration rate of 1.4 mAh/g/cycle. © 2013 Elsevier Ltd and Techna Group S.r.l.


Song M.Y.,Chonbuk National University | Rim H.,ASE Korea | Park H.R.,Chonnam National University
Ceramics International | Year: 2014

Cathode active materials with a composition of LiNi0.7Co 0.3O2 were synthesized by solid-state reaction at 800 C using Li2CO3 or LiOH·H2O, NiO or NiCO3, and CoCO3 or Co3O4 as sources of Li, Ni, and Co, respectively. The electrochemical properties of the synthesized samples were then investigated. The structures of the synthesized LiNi0.7Co0.3O2 samples were analyzed, and the microstructures of the samples were observed. The curves of voltage vs. x in LixNi0.7Co0.3O2 for the first charge-discharge and the intercalated and deintercalated Li quantity Δx were studied. The LiNi0.7Co0.3O2 sample synthesized from LiOH·H2O, NiO, and Co3O 4 had the largest first discharge capacity of 162 mAh/g with a discharge capacity deterioration rate of 9.1 mAh/g/cycle. © 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Youp Song M.,Chonbuk National University | Rim H.,ASE Korea | Song J.,Cornell University | Mumm D.R.,University of California at Irvine
Ceramics International | Year: 2013

LiNi0.5Co0.5O2 cathode materials were synthesized by a solid-state reaction method at 800 °C using Li 2CO3, LiOH·H2O; NiO, NiCO3; CoCO3, or Co3O4 as the sources of Li, Ni, and Co, respectively. The electrochemical properties of the synthesized samples were then investigated. The structure of the synthesized LiNi0.5Co 0.5O2 was analyzed, and the microstructures of the samples were observed. The curves of voltage vs. x in LixNi 0.5Co0.5O2 for first charge-discharge and intercalated and deintercalated Li quantity Δx were studied. Destruction of unstable 3b sites and phase transitions were discussed from the first and second charge-discharge curves of voltage vs. x in LixNi 0.5Co0.5O2. The LiNi0.5Co 0.5O2 sample synthesized from Li2CO 3, NiCO3 and Co3O4 has the largest first discharge capacity (142 mAh/g). The LiNi0.5Co 0.5O2 sample synthesized from Li2CO 3, NiO and Co3O4 has a relatively large first discharge capacity (141 mAh/g) and the smallest capacity deterioration rate (4.6 mAh/g/cycle). © 2012 Elsevier Ltd and Techna Group S.r.l.


Rim H.,ASE Korea | Song J.,Woodbridge High School | Song J.,University of California at Irvine | Mumm D.R.,University of California at Irvine
Ceramics International | Year: 2014

Cathode active materials with a composition of LiNi0.7Co 0.3O2 were synthesized by a solid-state reaction method at 850 C using Li2CO3, NiO or NiCO3, and Co 3O4 or CoCO3 as the sources of Li, Ni, and Co, respectively. Electrochemical properties, structure, and microstructure of the synthesized LiNi0.7Co0.3O2 samples were analyzed. The curves of voltage vs. x in LixNi0.7Co 0.3O2 for the first charge-discharge and the intercalated and deintercalated Li quantity Δx were studied. The LiNi 0.7Co0.3O2 sample synthesized from Li 2CO3, NiO, and Co3O4 had the largest first discharge capacity (127 mAh/g), with a discharge capacity deterioration rate of 2.9 mAh/g/cycle. The LiNi0.7Co0.3O2 sample synthesized from Li2CO3, NiCO3, and Co3O4 had the smallest capacity deterioration rate of 1.3 mAh/g/cycle. © 2013 Elsevier Ltd and Techna Group S.r.l.

Loading ASE Korea collaborators
Loading ASE Korea collaborators