Charge–discharge behavior of a Na2FeP2O7 positive electrode in an ionic liquid electrolyte between 253 and 363 K - Chen, Chih-Yao; Matsumoto, Kazuhiko; Nohira, Toshiyuki; Ding, Changsheng; Yamamoto, Takayuki; Hagiwara, Rika (Electrochimica acta, 2014)