Research on the electrochemical properties of vanadium boride coated on the surface of NCM811
Source abstract
Abstract
LiNi 0.8Co 0.1Mn 0.1O 2 (NCM811) has attracted much attention because of its high specific capacity. However, its poor electrical conductivity and the side reactions at the electrode/electrolyte interface result in unsatisfactory rate and cycling performance. A wet coating method is adapted to deposit a layer of vanadium boride (V-B) compounds on the surface of NCM811 to improve its performance. The capacity retention of NCM@ 1 V-B is increased about 15% after 500 cycles at 1 C, compared to the capacity retention of NCM. SEM and TEM images show that the thickness of the NCM@ 1 V-B coating layer is about 2.5 nm, which effectively inhibits the cracking of the surface microstructure at the cathode surface and reduces side reactions at the electrode/electrolyte interface. Thinner SEI film with less F-containing species forms on the electrode surface, less volume changes occurring the phase transition are responsible for the improved cyclability and rate capability for V-B coated NCM.
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Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication
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