Typically, a tubular type Na-NiCl2 battery is operated at a high temperature above 280°C to obtain a reasonable electrochemical performance. Our recent work has demonstrated that a planar type Na-NiCl2 battery can achieve remarkable electrochemical performance over 1000 cycles even at an intermediate temperature (IT) of 190°C. The lower operating temperature allows for the development of cost-effective sealing technology that uses conventional high temperature polymers as sealing materials. We also demonstrate the Ni content in the cathode can be greatly reduced by 30% compared to that of the conventional Na-NiCl2 battery. Long term cell tests using the advanced cathode formula show a stable battery performance over 250 cycles.
Therefore, our work suggests that developing polymer sealing technology and advanced low Ni-content cathode materials at intermediate operating temperatures might provide a new breakthrough to Na-NiCl2 batteries for practical stationary energy storage applications.
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G.S. Li, X.C. Lu, J.Y. Kim, K.D. Meinhardt, H.J. Chang, N.L. Canfield, V.L. Sprenkle, Nat. Commun., 7 (2016) 10683.
H. J. Chang, X. Lu, J. F. Bonnett, N. L. Canfield, S. Son, Y. Park, K. Jung, V. L. Sprenkle, and G. Li. (submitted)
H. J. Chang, X. Lu, K. Jung, V. L. Sprenkle, and G. Li. (in preparation)