Microscale Core-Shell Structured Li [ ( Ni0.8Co0.1Mn0.1 ) 0.8 ( Ni0.5Mn0.5 ) 0.2 ] O2 as Positive Electrode Material for Lithium Batteries

A new concept of synergetic effects was developed with the synthesis of a spherical core-shell structure to effect a higher capacity from the LiNi 0.8 Co 0.1 Mn 0.1 O 2 core and improved thermal stability from the Li[Ni 0.5 Mn 0.5 ]O 2 shell. We now report the microscale spherical core-shell structure with LiNi 0.8 Co 0.1 Mn 0.1 O 2 as the core and a Li[Ni 0.5 Mn 0.5 ]O 2 as the shell. With these core-shell particles, a high capacity was delivered from the LiNi 0.8 Co 0.1 Mn 0.1 O 2 core and a high thermal stability was achieved by the Li[Ni 0.5 Mn 0.5 ]O 2 shell. The core-shell structured Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 0.8 (Ni 0.5 Mn 0.5 ) 0.2 ]O 2 -carbon cell showed superior cyclability and thermal stability relative to the Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 alone at a 1 C rate for 600 cycles. As a new positive electrode material, the core-shell structure of Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 0.8 (Ni 0.5 Mn 0.5 ) 0.2 ]O 2 provides a significant breakthrough for the development of lithium batteries with high capacity, excellent cyclability, and high thermal stability.

[1]  S. Okada,et al.  Thermal behavior of Li1-yNiO2 and the decomposition mechanism , 1998 .

[2]  Tsutomu Ohzuku,et al.  Layered Lithium Insertion Material of LiNi1/2Mn1/2O2 : A Possible Alternative to LiCoO2 for Advanced Lithium-Ion Batteries , 2001 .

[3]  Seung‐Taek Myung,et al.  Hydrothermal synthesis of layered Li[Ni0.5Mn0.5]O2 as lithium intercalation material , 2004 .

[4]  Daniel P. Abraham,et al.  Layered Li(Ni0.5−xMn0.5−xM2x′)O2 (M′=Co, Al, Ti; x=0, 0.025) cathode materials for Li-ion rechargeable batteries , 2002 .

[5]  Seung‐Taek Myung,et al.  Synthesis and electrochemical properties of layered LiNi1/2Mn1/2O2prepared by coprecipitation , 2005 .

[6]  T. Ohzuku,et al.  Lithium insertion material of LiNi 1/2Mn 1/2O 2 for advanced lithium-ion batteries , 2003 .

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

[8]  Jaephil Cho,et al.  Synthesis, Thermal, and Electrochemical Properties of AlPO4-Coated LiNi0.8Co0.1Mn0.1 O 2 Cathode Materials for a Li-Ion Cell , 2004 .

[9]  J. Goodenough,et al.  Synthesis and structural characterization of the normal spinel Li[Ni2]O4 , 1985 .

[10]  Zhonghua Lu,et al.  Synthesis, Structure, and Electrochemical Behavior of Li [ Ni x Li1 / 3 − 2x / 3Mn2 / 3 − x / 3 ] O 2 , 2002 .

[11]  C. Delmas,et al.  Effect of iron on the electrochemical behaviour of lithium nickelate: from LiNiO2 to 2D-LiFeO2 , 2000 .

[12]  Lisa C. Klein,et al.  Cobalt dissolution in LiCoO2-based non-aqueous rechargeable batteries , 1996 .

[13]  K. Amine,et al.  Synthesis and electrochemical behavior of layered Li(Ni0.5−xCo2xMn0.5−x)O2 (x = 0 and 0.025) materials prepared by solid-state reaction method , 2004 .

[14]  M. Broussely,et al.  LixNiO2, a promising cathode for rechargeable lithium batteries , 1995 .

[15]  Seung‐Taek Myung,et al.  Effects of Al doping on the microstructure of LiCoO2 cathode materials , 2001 .

[16]  Xiao‐Qing Yang,et al.  INVESTIGATION OF THE LOCAL STRUCTURE OF THE LINI0.5MN0.5O2 CATHODE MATERIAL DURING ELECTROCHEMICAL CYCLING BY X-RAY ABSORPTION AND NMR SPECTROSCOPY , 2002 .

[17]  Seung‐Taek Myung,et al.  Synthesis of LiNi0.5Mn0.5-xTixO2 by an Emulsion Drying Method and Effect of Ti on Structure and Electrochemical Properties , 2005 .

[18]  Yang-Kook Sun,et al.  Synthesis and characterization of Li[(Ni0.8Co0.1Mn0.1)0.8(Ni0.5Mn0.5)0.2]O2 with the microscale core-shell structure as the positive electrode material for lithium batteries. , 2005, Journal of the American Chemical Society.

[19]  J. Dahn,et al.  Morphology and Safety of Li [ Ni x Co1 − 2x Mn x ] O 2 ( 0 ⩽ x ⩽ 1 / 2 ) , 2003 .