TY - JOUR
T1 - Enhancement of Structural, Electrochemical, and Thermal Properties of Ni-Rich LiNi0.85Co0.1Mn0.05O2 Cathode Materials for Li-Ion Batteries by Al and Ti Doping
AU - Levartovsky, Yehonatan
AU - Wu, Xiaohan
AU - Erk, Christoph
AU - Maiti, Sandipan
AU - Grinblat, Judith
AU - Talianker, Michael
AU - Aurbach, Doron
N1 - Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2021/1
Y1 - 2021/1
N2 - Ni-rich layered oxides LiNi1-x-yCoxMnyO2 (1−x−y>0.5) are promising cathode materials for the new generation of Li-ion batteries suitable for electro-mobility due to their high energy density, good rate capability, and relatively low cost. However, their main drawback is poor cycling performance, particularly at elevated temperatures. In this research, it is demonstrated how doping with Al and Ti, using straightforward solid-state mixing synthesis, can dramatically enhance the structural, electrochemical, and thermal properties of LiNi0.85Co0.1Mn0.05O2 (NCM85). The capacity retention of Al-doped and Ti-doped cathodes after 100 cycles at 100 % DOD at 1 C and 45 °C using standard electrolyte solutions could reach nearly 99 % and 78 %, respectively, while the capacity retention of the undoped material was less than 74 % in similar experiments. Doping with Al and Ti facilitates the Li intercalation processes and reduces voltage hysteresis. Structural study of the cycled cathodes shows that doping with Al, and to a smaller extent with Ti, reduces the formation of cracks in the particles of the cathode materials upon cycling, consequently reducing degradation. Thermal studies show that doping with Al or Ti improves the thermal stability of these cathode materials. Highly interesting is the correlation between the morphology and thermal stability, impedance properties and the electrochemical characteristics as a function of doping.
AB - Ni-rich layered oxides LiNi1-x-yCoxMnyO2 (1−x−y>0.5) are promising cathode materials for the new generation of Li-ion batteries suitable for electro-mobility due to their high energy density, good rate capability, and relatively low cost. However, their main drawback is poor cycling performance, particularly at elevated temperatures. In this research, it is demonstrated how doping with Al and Ti, using straightforward solid-state mixing synthesis, can dramatically enhance the structural, electrochemical, and thermal properties of LiNi0.85Co0.1Mn0.05O2 (NCM85). The capacity retention of Al-doped and Ti-doped cathodes after 100 cycles at 100 % DOD at 1 C and 45 °C using standard electrolyte solutions could reach nearly 99 % and 78 %, respectively, while the capacity retention of the undoped material was less than 74 % in similar experiments. Doping with Al and Ti facilitates the Li intercalation processes and reduces voltage hysteresis. Structural study of the cycled cathodes shows that doping with Al, and to a smaller extent with Ti, reduces the formation of cracks in the particles of the cathode materials upon cycling, consequently reducing degradation. Thermal studies show that doping with Al or Ti improves the thermal stability of these cathode materials. Highly interesting is the correlation between the morphology and thermal stability, impedance properties and the electrochemical characteristics as a function of doping.
KW - Al doping
KW - Li-ion batteries
KW - LiNiCoMnO
KW - Ni-rich cathode materials
KW - Ti doping
UR - http://www.scopus.com/inward/record.url?scp=85099442389&partnerID=8YFLogxK
U2 - 10.1002/batt.202000191
DO - 10.1002/batt.202000191
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AN - SCOPUS:85099442389
SN - 2566-6223
VL - 4
SP - 221
EP - 231
JO - Batteries and Supercaps
JF - Batteries and Supercaps
IS - 1
ER -