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研究了应用于锂二次电池正极的新型高能量密度存贮材料Li(AlxCo1 -x)O2 (x =0 1— 0 5 )的磁性 .发现Al3+ 的掺杂可导致Co3+ 中d电子自旋态发生变化 ,即有部分d电子进入高自旋态 .伴随Co3+ 中电子状态的改变 ,材料结构演化也发生了相应变化 ,表现为c a比增大明显减缓 ,较好地解释了材料结构对Vegard定律的正偏离 .这对材料的微观结构与性能设计具有重要意义 .
The magnetic properties of Li (AlxCo1-x) O2 (x = 0 1 ~ 0 5), a new type of high energy density memory material used in the positive electrode of lithium secondary batteries, were investigated. It was found that the doping of Al3 + , Some d electrons enter the high spin state.With the change of the electron state in Co3 +, the material structure evolution also changes correspondingly, which shows that Ca is obviously slower than the increase, which better explains the positive effect of material structure on Vegard’s law Deviation.This is of great importance for the design of microstructure and properties of materials.