Abstract
With the increasing demand for high-capacity and high-rate lithium batteries, ternary cathode materials with high-capacity and high-rate performance became more and more important. In order to obtain ternary cathode material with high performance, a combustion method was developed in this paper. Specifically, nickel, cobalt and manganese metal ions were fully complexed with organic matter (citric acid), assisted with the surfactant (polyvinyl pyrrolidone), and then a ternary cathode material (NCM622) precursor with nano-meter structure was prepared. After being performed with suitable calcination operations, the NCM622 cathode material was prepared. The obtained materials were characterized by XRD, SEM, XPS, particle size analysis and electrochemical performance tests. The results showed that the material obtained at 850 ℃ for 10h exhibited good dimensional uniformity, good layered structure and low lithium nickel mixing degree. Moreover, it had excellent electrochemical performance: its discharge specific capacity with general charge and discharge voltage range (2.8-4.3V) was up to 209.1 mAh.g-1 (0.2C), and its capacity decay rate was about 101.1% after 100 cycles at 0.5C in half-battery conditions. Even at 10C, it still had a discharge capacity of 116.4 mAh.g-1, showing excellent capacity and rate performance.
Published Version
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