Synthesis of Mg-doped LiNi0.8Co0.15Al0.05O2 oxide and its electrochemical behavior in high-voltage lithium-ion batteries

Abstract Mg-doped LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) cathode material is synthesized from Mg and Li co-coated Ni 0.8 Co 0.15 Al 0.05 (OH) 2 precursor. X-ray diffraction (XRD) results indicate that the Mg-doped samples are indexed with hexagonal layered structure and no other impurity peak is found. Moreover, both the lattice parameters a and c increase as the quantity of Mg dopant grows. Scanning electron microscope (SEM) results reveal that the morphologies of the Mg-doped samples are almost the same as that of the pristine one. Electrochemical characterizations show that the Mg-doping leads to higher activation energy for the migration of Li-ions, and suppresses the phase transition between H2 and H3. Furthermore, the pristine and 1 at% Mg-doped samples are selected for studying the degradation behavior at higher upper cutoff potentials. When charged to higher cutoff potentials, the Mg-doped NCA cathode exhibits less capacity fading during cycling than the pristine one.

[1]  Xunhui Xiong,et al.  Enhanced electrochemical performance in LiNi0.8Co0.15Al0.05O2 cathode material: Resulting from Mn-surface-modification using a facile oxidizing–coating method , 2014 .

[2]  Jaephil Cho,et al.  A new type of protective surface layer for high-capacity Ni-based cathode materials: nanoscaled surface pillaring layer. , 2013, Nano letters.

[3]  Feixiang Wu,et al.  Low-temperature synthesis of nano-micron Li4Ti5O12 by an aqueous mixing technique and its excellent electrochemical performance , 2012 .

[4]  Y. Ukyo,et al.  Stabilizing Effect of Mg on the Energetics of the Li(Ni,Co,Al)O2 Cathode Material for Lithium Ion Batteries , 2013 .

[5]  Gleb Yushin,et al.  High‐Capacity Anode Materials for Lithium‐Ion Batteries: Choice of Elements and Structures for Active Particles , 2014 .

[6]  Yuji Kojima,et al.  Effect of Mg-doping on the degradation of LiNiO2-based cathode materials by combined spectroscopic methods , 2012 .

[7]  I. Uchida,et al.  In Situ Observation of LiNiO2 Single‐Particle Fracture during Li ‐ Ion Extraction and Insertion , 1999 .

[8]  B. Scrosati,et al.  Effect of Mg2+ Doping on the Structural, Thermal, and Electrochemical Properties of LiNi0.8Co0.16Mg0.04O2 , 2004 .

[9]  Eun-Gi Shim,et al.  High-voltage cell performance and thermal stability of nanoarchitectured polyimide gel polymer electrolyte-coated LiCoO2 cathode materials , 2012 .

[10]  Tsuyoshi Sasaki,et al.  Effects of Mg-substitution in Li(Ni,Co,Al)O2 positive electrode materials on the crystal structure and battery performance , 2007 .

[11]  Yang-Kook Sun,et al.  Challenges facing lithium batteries and electrical double-layer capacitors. , 2012, Angewandte Chemie.

[12]  Lijun Wu,et al.  Structural Origin of Overcharge-Induced Thermal Instability of Ni-Containing Layered-Cathodes for High-Energy-Density Lithium Batteries , 2011 .

[13]  Alan V. Chadwick,et al.  On the behavior of the LixNiO2 system: an electrochemical and structural overview , 1997 .

[14]  Yun Jung Lee,et al.  Cobalt-free nickel rich layered oxide cathodes for lithium-ion batteries. , 2013, ACS applied materials & interfaces.

[15]  Chong Seung Yoon,et al.  Comparison of the structural and electrochemical properties of layered Li[NixCoyMnz]O2 (x = 1/3, 0.5, 0.6, 0.7, 0.8 and 0.85) cathode material for lithium-ion batteries , 2013 .

[16]  Yong-ki Park,et al.  Method of Preparation for Particle Growth Enhancement of LiNi0.8Co0.15Al0.05O2 , 2009 .

[17]  P. Novák,et al.  Morphological and Structural Changes of Mg-Substituted Li(Ni,Co,Al)O2 during Overcharge Reaction , 2011 .

[18]  J. Nan,et al.  High-voltage performance of LiCoO2/graphite batteries with methylene methanedisulfonate as electrolyte additive , 2012 .

[19]  M. Wohlfahrt‐Mehrens,et al.  Doped lithium nickel cobalt mixed oxides for the positive electrode in lithium ion batteries , 2002 .

[20]  K. Amine,et al.  Significant Improvement of Electrochemical Performance of AlF3-Coated Li [ Ni0.8Co0.1Mn0.1 ] O2 Cathode Materials , 2007 .

[21]  Feixiang Wu,et al.  Petal-like Li4Ti5O12-TiO2 nanosheets as high-performance anode materials for Li-ion batteries. , 2013, Nanoscale.

[22]  Xiao‐Qing Yang,et al.  A comparative study on structural changes of LiCo1/3Ni1/3Mn1/3O2 and LiNi0.8Co0.15Al0.05O2 during first charge using in situ XRD , 2006 .

[23]  J. Dahn,et al.  In situ x-ray diffraction and electrochemical studies of Li1−xNiO2 , 1993 .

[24]  C. Delmas,et al.  The LixNi1−yMgyO2 (y=0.05, 0.10) system: structural modifications observed upon cycling , 2000 .