LiCoO2中锂离子固相扩散系数随循环次数的变化

The solid diffusion coefficient of lithium-ion in LiCoO₂ cathode material has been investigated by the capacity intermittent titration technique (CITT) at different voltages and at different charge/discharge cycles. By SEM, XRD and FTIR techniques, the structure of LiCoO₂ was studied before and after charge-discharge cycles, and the relationship between solid diffusion coefficient and crystal structure was further discussed. CITT results show that the value of Li⁺ solid diffusion coefficient of LiCoO₂ is about 10^-12 cm²·s^-1. During the whole charge-discharge cycles, the Li⁺ solid diffusion coefficient decreased within the voltage of 4.0～4.3 V, which is attributed to the change of the structure of LiCoO₂.     

固定化酶的反应扩散过程的靶波解

通过固定化酶的数学模型的数值模拟,发现其反应扩散过程是以靶波形式出现的。     

THE TARGET WAVE PATTERNS OF A REACTION-DIFFUSION PROCESS IN AN IMMOBILIZED ENZYME

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｅｎｚｙｍｅｉｓａｃｏｎｃｅｎｔｒａｔｅｄａｎｄｓｐｅｃｉｆｉｃａｌｂｉｏ＿ｃａｔａｌｙｓｔ．Ｉｔｓｅｓｅｎｃｅｉｓａｐｒｏｔｅｉｎａｎｄｉｔｓａｐｐｌｉｃａｔｉｏｎｉｓｖｅｒｙｅｘｔｅｎｓｉｖｅ．Ｈｏｗｅｖｅｒｉｔｈａ...     

六次甲基四胺与氯化钴室温固相反应机制的研究

室温固相反应作为一种高效、绿色的合成方法,在配位化合物、纳米材料、金属簇合物以及复合金属氧化物的合成中已经得到了广泛的应用[1￣6]。然而,到目前为止人们对室温固相反应的微观机制尚处于     

The target wave patterns of a reaction-diffusion process in an immobilized enzyme

In this paper, the target wave patterns of a reaction-diffusion process were discovered by numerical simulation of an immobilized enzyme mathematical model. The substrate concentration periodically diffuses from initial state to all around, and the product concentration also periodically increases with target wave patterns, and finally they reach the equilibrium states.