High Efficient and Environment Friendly Plasma-Enhanced Synthesis of Al2O3-Coated LiNi1/3Co1/3Mn1/3O2 With Excellent Electrochemical Performance

Abstract

PLA-1-Al₂O₃@LNCM synthesized using an efficient and facile plasma-enhanced method exhibits markedly improved capacity retention of 98.6% after 100 cycles, which is much larger than that of LNCM at 80% after 100 cycles. What is more, it also exhibits significantly enhanced cyclicity compared to that of 1-Al₂O₃@LNCM cathodes prepared using the normal solid state method, which further illustrates the efficiency and superiority of this plasma-enhanced method. More importantly, the rate performance of PLA-1-Al₂O₃@LNCM is improved because of the better electrolyte storage of the assembled hierarchical architecture of the Al₂O₃ coating layer according to unimpeded Li+ diffusion from electrode to electrolyte. When cycling at 55°C, the PLA-1-Al₂O₃@LNCM shows 93.6% capacity retention after 100 cycles, which is greatly enhanced due to the uniform Al₂O₃ layer. Further, growth of polarization impedance during cycling can be effectively suppressed by the Al₂O₃ layer, which can further confirm the effect the Al₂O₃ layer coated on the surface of the LNCM. The enhanced cycling performance and thermal stability illustrates that this facile surface modification, using the plasma-enhanced method, can form an effective structured coating layer, which indicates its prospects as an application in the modification of other electrode materials.