Lithium manganese titanium oxide Li_2.7MnTi₃O₉ with the Na_2.08Ti₄O₉-type tunnel structure was prepared at 270 °C via ion-exchange reaction using the starting compound Na_2.7MnTi₃O₉ in molten salts of LiNO₃ and LiNO₃-LiOH·H₂O for the first time. The starting Na_2.7MnTi₃O₉ sample was synthesized at 900 °C using conventional solid-state reaction. We determined the Na_2.08Ti₄O₉-type tunnel structure of monoclinic Na_2.7MnTi₃O₉ with the C2/m space group by powder X-ray Rietveld analysis. The cell parameters were determined to be a = 22.9995(8) Å, b = 2.9160(1) Å, c = 10.6319(4) Å, β = 102.544(2)°, and V = 696.02(4) ų. We monitored the progress of ion-exchange reaction by the analytical results of ICP-AES. Rietveld analysis confirmed the ion-exchanged Li_2.7MnTi₃O₉ sample maintained the original tunnel-type structure belonging to the same space group of C2/m. The cell parameters for Li_2.7MnTi₃O₉ apparently decreased to be a = 21.1697(18) Å, b = 2.8926(1) Å, c = 10.6314(6) Å, β = 102.531(4)°, and V = 635.51(7) ų, compared with those for Na_2.7MnTi₃O₉. The electrochemical experiments of Li_2.7MnTi₃O₉ revealed the lithium insertion/extraction reaction at ca. 3.0 V with high reversibility, which attributed to the Mn³⁺/Mn⁴⁺ redox reaction. The initial discharge capacity of 46 mAh g⁻¹ corresponded to the inserted lithium content of 0.6 for chemical formula.

使用起始化合物Na _2.7 MnTi ₃ O ₉在LiNO ₃和Al2O3的熔融盐中，通过离子交换反应，在270°C下制备具有Na _2.08 Ti ₄ O ₉型隧道结构的锂锰钛氧化物Li _2.7 MnTi ₃ O ₉。的LiNO ₃ -LiOH·H ₂ O可以在第一次。使用常规固态反应在900°C下合成起始Na _2.7 MnTi ₃ O ₉样品。我们确定了Na _2.08 Ti ₄ O ₉粉末X射线Rietveld分析的C 2 / m空间群的单斜Na _2.7 MnTi ₃ O ₉单斜型隧道结构。晶胞参数被确定为一个 = 22.9995（8）埃，b  = 2.9160（1）埃，c ^  = 10.6319（4），β  = 102.544（2）°，V  = 696.02（4）³。我们通过ICP-AES的分析结果监测了离子交换反应的进展。Rietveld分析证实离子交换的Li _2.7 MnTi ₃ O ₉样品保持了原来的隧道型结构，属于相同的空间群。C 2 /米。Li _2.7 MnTi ₃ O ₉的电池参数明显降低为a  = 21.1697（18）Å，b  = 2.8926（1）Å，c  = 10.6314（6）Å，β  = 102.531（4）°，V  = 635.51 （7）一种³，与那些的Na相比_2.7 MnTi ₃ ö ₉。Li _2.7 MnTi ₃ O ₉的电化学实验表明，锂的插入/拔出反应温度约为。3.0 V具有高可逆性，这归因于Mn ³⁺ / Mn ⁴⁺氧化还原反应。初始放电容量为46 mAh g ^-1，对应于化学式中插入的锂含量为0.6。