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<p>Charge storage based on anion intercalation is far less common than processes involving cation intercalation. Recently, oxide-anion-based charge storage has been demonstrated in some oxide materials through a pseudocapacitive process. In this work, quasi-two-dimensional (2D) oxides with the formula LaSrMn<sub>0.5</sub>M<sub>0.5</sub>O<sub>4</sub> (M = Co, Ni) were investigated with respect to their pseudocapacitive charge storage properties. The two materials are isostructural and comprise 2D layers of BO<sub>6</sub> octahedra (B is a transition metal), separated by La/Sr. The pseudocapacitive charge storage, involving the intercalation and deintercalation of oxide ion, is facilitated by the wide gap between 2D layers. The diffusive and capacitive contributions to the observed current were analyzed. In addition, symmetric full cells were fabricated using both materials. At a current density of 0.5 A/g in a symmetric cell in 1&#xa0;M KOH, LaSrMn<sub>0.5</sub>Co<sub>0.5</sub>O<sub>4</sub> and LaSrMn<sub>0.5</sub>Ni<sub>0.5</sub>O<sub>4</sub> showed respective specific capacitance values of 193&#xa0;F/g and 60&#xa0;F/g, and energy densities of 68&#xa0;Wh/kg and 21&#xa0;Wh/kg, at a power density of 1600&#xa0;W/kg. Importantly, compared to other anion-based charge storage systems, LaSrMn<sub>0.5</sub>Co<sub>0.5</sub>O<sub>4</sub> shows remarkable specific capacitance and energy density values, which are superior to those of many previously reported pseudocapacitors operating based on oxide intercalation. This material also shows very stable performance, retaining its specific capacitance even after 10,000 charge–discharge cycles.</p>

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Charge Storage in Quasi-2D Oxides LaSrMn0.5M0.5O4 (M = Co, Ni)

  • 期刊论文

  • 发表日期：

    2026年1月11日

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  • Kinithi M. K. Wickramaratne,
  • Narayan Acharya,
  • Farshid Ramezanipour

摘要

Charge storage based on anion intercalation is far less common than processes involving cation intercalation. Recently, oxide-anion-based charge storage has been demonstrated in some oxide materials through a pseudocapacitive process. In this work, quasi-two-dimensional (2D) oxides with the formula LaSrMn0.5M0.5O4 (M = Co, Ni) were investigated with respect to their pseudocapacitive charge storage properties. The two materials are isostructural and comprise 2D layers of BO6 octahedra (B is a transition metal), separated by La/Sr. The pseudocapacitive charge storage, involving the intercalation and deintercalation of oxide ion, is facilitated by the wide gap between 2D layers. The diffusive and capacitive contributions to the observed current were analyzed. In addition, symmetric full cells were fabricated using both materials. At a current density of 0.5 A/g in a symmetric cell in 1 M KOH, LaSrMn0.5Co0.5O4 and LaSrMn0.5Ni0.5O4 showed respective specific capacitance values of 193 F/g and 60 F/g, and energy densities of 68 Wh/kg and 21 Wh/kg, at a power density of 1600 W/kg. Importantly, compared to other anion-based charge storage systems, LaSrMn0.5Co0.5O4 shows remarkable specific capacitance and energy density values, which are superior to those of many previously reported pseudocapacitors operating based on oxide intercalation. This material also shows very stable performance, retaining its specific capacitance even after 10,000 charge–discharge cycles.