The reversible electrochemical cycling of sodium ions in several variants of low cost, easy to produce TiP₂O₇ as the negative electrode material in an aqueous battery is demonstrated for the first time. TiP₂O₇ is synthesized using a high temperature solid-state route and a low temperature sol gel route. The materials are electrochemically characterized in an aqueous 1 M Na₂SO₄ electrolyte with a Na_0.44MnO₂ counter electrode material. While little capacity for sodium ion cycling is reflected in cyclic voltammetry, all observed samples exhibited reversible cycling of sodium ions in galvanostatic cycling with potential limitation. To our knowledge, this is the first report of solid-state synthesized TiP₂O₇ reversibly cycling sodium ions, and the first report of TiP₂O₇ reversibly cycling sodium ions in aqueous electrolytes. Discharge specific capacity is found to be positively correlated with crystallite size and low specific currents.

首次展示了钠离子的可逆电化学循环，它具有多种低成本，易于生产的TiP ₂ O ₇作为水性电池中的负极材料的优点。TiP ₂ O ₇使用高温固态路线和低温溶胶凝胶路线合成。在具有Na _0.44 MnO _2的1 M Na ₂ SO ₄水溶液中对材料进行电化学表征对电极材料。尽管循环伏安法几乎没有反映出钠离子循环的能力，但所有观察到的样品在恒电流循环中均表现出可逆的钠离子循环，但存在潜在的局限性。据我们所知，这是固态合成的TiP ₂ O ₇可逆循环钠离子的第一个报道，也是TiP ₂ O ₇可逆循环钠离子在水性电解质中的第一个报道。发现放电比容量与微晶尺寸和低比电流正相关。