Shaju Kuthanapillil M, Bruce Peter G
EaStChem, School of Chemistry, University of St Andrews, St Andrews, UK KY16 9ST.
Dalton Trans. 2008 Oct 28(40):5471-5. doi: 10.1039/b806662k. Epub 2008 Aug 15.
Disordered and ordered forms of nano-Li[Ni(0.5)Mn(1.5)]O(4) spinel, have been prepared by a one-pot resorcinol-formaldehyde synthesis. Lithium intercalation into disordered nano-Li[Ni(0.5)Mn(1.5)]O(4-delta) reveals good rate capability and cycling stability. It delivers 95.5% of the capacity at a rate of 10C (1500 mA g(-1)) and 88% at 20C (3000 mA g(-1)) compared with the capacity at low rate (0.2C). A capacity retention on cycling of 99.97% per cycle at 1C rate has also been observed. The superior electrochemical behaviour of disordered nano-Li[Ni(0.5)Mn(1.5)]O(4-delta) has been correlated with AC impedance data, which suggests a modified surface for the nanomaterial prepared using the resorcinol-formaldehyde route compared with micron sized materials prepared by conventional solid state synthesis.
通过一锅法间苯二酚-甲醛合成制备了无序和有序形式的纳米Li[Ni(0.5)Mn(1.5)]O₄ 尖晶石。锂嵌入无序纳米Li[Ni(0.5)Mn(1.5)]O₄₋ₓ显示出良好的倍率性能和循环稳定性。与低倍率（0.2C）下的容量相比，它在10C（1500 mA g⁻¹）倍率下可提供95.5%的容量，在20C（3000 mA g⁻¹）倍率下可提供88%的容量。在1C倍率下还观察到每循环容量保持率为99.97%。无序纳米Li[Ni(0.5)Mn(1.5)]O₄₋ₓ优异的电化学行为与交流阻抗数据相关，这表明与通过传统固态合成制备的微米级材料相比，使用间苯二酚-甲醛路线制备的纳米材料具有改性表面。
