Effects of Washing and Heat-treatment on Structure and Electrochemical Charge/Discharge Property for LiNi$lt;inf$gt;0.8$lt;/inf$gt;Co$lt;inf$gt;0.15$lt;/inf$gt;Al$lt;inf$gt;0.05$lt;/inf$gt;O$lt;inf$gt;2$lt;/inf$gt; Powder

Abstract

The effect of washing on electrochemical properties of Ni-rich layered cathode LiNi0.8Co0.15Al0.05O2 powder is widely known, but few literatures have reported thoroughly. Primitive LiNi0.8Co0.15Al0.05O2 powders processed by deionized water and heat-treatment at different temperatures in a paralleling time was explored for the first time. Sig- nificant changes of structure, morphology and electrochemical charge/discharge property of the LiNi0.8Co0.15Al0.05O2 cathode were detected comprehensively. Mechanism of washing and heat-treatment on the structure and electrochemi- cal charge/discharge property and the rate performance were studied. XRD patterns show the I(003)/I(104) value of LiNi0.8Co0.15Al0.05O2 powders decreases and the volume turns smaller after being washed and heat-treated. FT-IR spec- tra confirm the existence of lithium carbonate, and nickel compounds and their relative changes in the LiNi0.8Co0.15Al0.05O2 powders. The specific capacity and rate performance of the LiNi0.8Co0.15Al0.05O2 powders were carried out before and after washing and heat-treatment. The capacities of primitive sample and treated samples remain 88.87%, 87.21%, 85.43% and 87.80% after 30 cycles, respectively.