铵根离子预嵌入对二氧化锰正极材料放电行为的影响

为了缓解锰基正极材料在水系锌离子电池充放电过程中引起的结构塌陷,预嵌入分子和离子是一种有效的解决手段。通过简单的水热法,将与锌离子半径相近的铵根离子(NH_(4)^(+))预嵌入α-MnO_(2)材料中,制备了一种水系锌离子电池正极材料(NMnO_(2))。铵根离子的预嵌入稳固了锰基材料的宿主结构,降低了电化学过程中的电荷转移势垒,进而提高了正极材料的反应动力学。结果表明:所组装的锌离子电池在电流密度0.5 A/g下的初始比容量达到304.1 mA·h/g,充放电循环1000次后容量保持率为77.7%;在1 A/g下的电流密度下初始比容量为183.5 mA·h/g,经过2000次循环后,电池比容量仍然达到138.7 mA·h/g,容量保持率为75.5%。此外,等效模拟电路的计算和CV曲线测试结果表明,扩散作用和赝电容行为的共同作用机制有效地提升了锌离子电池的倍率性能。

Research on Steward Dynamic Platform Simulation Numerical Algorithm

In order to achieve attitude control of the six degrees of freedom steward dynamic platform, as well as the real time simulation cockpit attitude, Washout Filtering method was adopted in this paper as the simulation algorithm to derive Washout Fiher high-pass, low-pass filter transfer functions into a differential equation algorithm and longitudinal acceleration tilt strategy, pitching strategies etc. Experimental examples are used to verify correctness of the algorithm.