TY - JOUR
T1 - Exploring Lithium-Cobalt-Nickel Oxide Spinel Electrodes for ≥3.5 v Li-Ion Cells
AU - Lee, Eungje
AU - Blauwkamp, Joel
AU - Castro, Fernando C.
AU - Wu, Jinsong
AU - Dravid, Vinayak P.
AU - Yan, Pengfei
AU - Wang, Chongmin
AU - Kim, Soo
AU - Wolverton, Christopher
AU - Benedek, Roy
AU - Dogan, Fulya
AU - Park, Joong Sun
AU - Croy, Jason R.
AU - Thackeray, Michael M.
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/10/19
Y1 - 2016/10/19
N2 - Recent reports have indicated that a manganese oxide spinel component, when embedded in a relatively small concentration in layered xLi2MnO3·(1-x)LiMO2 (M = Ni, Mn, or Co) electrode systems, can act as a stabilizer that increases their capacity, rate capability, cycle life, and first-cycle efficiency. These findings prompted us to explore the possibility of exploiting lithiated cobalt oxide spinel stabilizers by taking advantage of (1) the low mobility of cobalt ions relative to that of manganese and nickel ions in close-packed oxides and (2) their higher potential (∼3.6 V vs Li0) relative to manganese oxide spinels (∼2.9 V vs Li0) for the spinel-to-lithiated spinel electrochemical reaction. In particular, we revisited the structural and electrochemical properties of lithiated spinels in the LiCo1-xNixO2 (0 ≤ x ≤ 0.2) system, first reported almost 25 years ago, by means of high-resolution (synchrotron) X-ray diffraction, transmission electron microscopy, nuclear magnetic resonance spectroscopy, electrochemical cell tests, and theoretical calculations. The results provide a deeper understanding of the complexity of intergrown layered/lithiated spinel LiCo1-xNixO2 structures when prepared in air between 400 and 800 °C and the impact of structural variations on their electrochemical behavior. These structures, when used in low concentrations, offer the possibility of improving the cycling stability, energy, and power of high energy (≥3.5 V) lithium-ion cells.
AB - Recent reports have indicated that a manganese oxide spinel component, when embedded in a relatively small concentration in layered xLi2MnO3·(1-x)LiMO2 (M = Ni, Mn, or Co) electrode systems, can act as a stabilizer that increases their capacity, rate capability, cycle life, and first-cycle efficiency. These findings prompted us to explore the possibility of exploiting lithiated cobalt oxide spinel stabilizers by taking advantage of (1) the low mobility of cobalt ions relative to that of manganese and nickel ions in close-packed oxides and (2) their higher potential (∼3.6 V vs Li0) relative to manganese oxide spinels (∼2.9 V vs Li0) for the spinel-to-lithiated spinel electrochemical reaction. In particular, we revisited the structural and electrochemical properties of lithiated spinels in the LiCo1-xNixO2 (0 ≤ x ≤ 0.2) system, first reported almost 25 years ago, by means of high-resolution (synchrotron) X-ray diffraction, transmission electron microscopy, nuclear magnetic resonance spectroscopy, electrochemical cell tests, and theoretical calculations. The results provide a deeper understanding of the complexity of intergrown layered/lithiated spinel LiCo1-xNixO2 structures when prepared in air between 400 and 800 °C and the impact of structural variations on their electrochemical behavior. These structures, when used in low concentrations, offer the possibility of improving the cycling stability, energy, and power of high energy (≥3.5 V) lithium-ion cells.
KW - lithium-cobalt-nickel oxide
KW - lithium-ion battery
KW - spinel
KW - stabilizer
KW - structure
UR - http://www.scopus.com/inward/record.url?scp=84992170322&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84992170322&partnerID=8YFLogxK
U2 - 10.1021/acsami.6b09073
DO - 10.1021/acsami.6b09073
M3 - Article
C2 - 27700026
AN - SCOPUS:84992170322
SN - 1944-8244
VL - 8
SP - 27720
EP - 27729
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 41
ER -