Tungsten oxide coating may be applied to lithium-ion battery to improve its electrochemical performance by surface modification of cathode material. It has been reported that tungsten oxide is evaluated as a protective inorganic coating layer on LiNi0.8Co0.1Mn0.1O2 (NCM-811) positive electrode materials for lithium-ion battery cells. And the researchers have investigated the regarding rate capability and cycling stability under different operation conditions.
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According to the reports, the interfacial resistance of uncoated and coated NCM-811 electrodes is explored to study the impact of the tungsten oxide on lithium-ion diffusion by using electrochemical impedance spectroscopy. All electrochemical investigations are carried out in lithium-ion battery full cells with graphite as a negative electrode to ensure better comparability with commercial cells. The coated electrodes show an excellent capacity retention for the long-term charge/discharge cycling of NCM-811-based lithium-ion battery full cells. Furthermore, the positive influence of the tungsten oxide coating on the thermal and structural stability is demonstrated using postmortem analysis of aged electrodes. Compared to the uncoated electrodes, the surface-modified electrodes show less degradation effects, such as particle cracking on the electrode surface and improvement of the thermal stability of NCM-811 in the presence of electrolyte.
