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High rate lithium ion battery with niobium tungsten oxide anode

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jats:pHighly stable lithium-ion battery cycling of niobium tungsten oxide (Nbjats:sub16</jats:sub>Wjats:sub5</jats:sub>Ojats:sub55</jats:sub>, NWO) is demonstrated in full cells with cathode materials LiNijats:sub0.6</jats:sub>Mnjats:sub0.2</jats:sub>Cojats:sub0.2</jats:sub>Ojats:sub2</jats:sub> (NMC-622) and LiFePOjats:sub4</jats:sub> (LFP). The cells show high rate performance and long-term stability under 5 C and 10 C cycling rates with a conventional carbonate electrolyte without any additives. The degradation of the cell performance is mainly attributed to the increased charge transfer resistance at the NMC side, consistent with the ex situ XRD and XPS analysis demonstrating the structural stability of NWO during cycling together with minimal electrolyte decomposition. Finally, we demonstrate the temperature-dependent performance of this full cell at 10, 25 and 60 °C and confirm, using jats:italicoperando</jats:italic> XRD, that the structural change of the NWO material during lithiation/de-lithiation at 60 °C is very similar to its behaviour at 25 °C, reversible and with a low volume change. With the merits of high rate performance and long cycle life, the combination of NWO and a commercial cathode represents a promising, safe battery for fast charge/discharge applications.</jats:p>



niobium tungsten oxide, anode material, lithium ion battery, high rate battery

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Journal of the Electrochemical Society

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The Electrochemical Society
Engineering and Physical Sciences Research Council (EP/M009521/1)
Engineering and Physical Sciences Research Council (EP/R511675/1)
This work was supported by EPSRC via the LIBATT grant (EP/M009521/1) and via an Impact Acceleration Account Follow-On grant (EP/R511675/1). The X-ray photoelectron (XPS) data collection was performed at the EPSRC National Facility for XPS (“HarwellXPS”), operated by Cardiff University and UCL, under Contract No. PR16195. We thank S. Shivareddy from CB2Tech Ltd. for advice on variable temperature cell operation. CPG and KJG are shareholders of a company that aims to commercialise fast charging anode materials.