Intercalation of carbon materials and nitrides and their battery applications

用~(7)Li核磁共振方法跟踪石墨负极嵌锂的结果表明，石墨层的传导电子移动是为了屏蔽嵌锂的正电荷。石墨层的堆积方式从ABA转变为AAA型似乎是为了有效地实现这种屏蔽。对于正电荷的屏蔽，除了改变堆积图案外，还考虑了增加层间距的方法。如果可以通过某些方法稳定地增加层间距，并且涡轮层状结构不会成为问题，那么也可以预期不伴随相变的单相插层成为可能。以LiMn2O4为正极，Li&lt；2.6-x&gt；Co&lt；0.4&gt；N为负极，电池从充电开始。在负极的提锂(电池中的放电)中，证实了每循环初始电位上升的现象。电解液在充电过程中发生分解，充电侧的容量大于放电侧的容量。这一现象似乎引起了Li_lt；2.6&gt；Co_&lt；0.4&gt；N中锂含量的变化。接下来，碘预先作用于氮化物，利用氧化氮化物制成了能量密度更高的电池。在LiMn_2O_4和Li_2O；1.37&gt；Co_t；0.4&gt；N上分别获得了容量约100mAhg；-1&gt；和400mAhg；-1&gt；N的LiMn_2O_4/LiMn_2O_4电池容量约为100mAhg；

As a result of tracing the lithium intercalation of graphite negative electrode by the ^7LiNMR method, it was indicated that conduction electrons of graphite layer moved in order to shield the plus charge of the lithium intercalated. The stacking pattern of the graphite layer changes from ABA to the AAA type seems to be for effectively carrying out this shielding. For the shielding of the plus charge, the method of increasing the interlayer distance except for the change of the stacking pattern is also considered. It can be also expected that monophase intercalation which does not accompany the phase change becomes possible, if stable increase of the interlayer distance by some methods is possible, and that the turbostratic structure does not become a problem.The battery performances of the nitride negative electrode in combining the oxide positive electrode was mainly examined. By combining LiMn2O_4 as a positive electrode with Li_<2.6-x>Co_<0.4>N with some Li defects as anegative electrode, the battery was started from the charging. In the lithium extraction of the negative electrode(discharge in the cell), the phenomenon in which the initial potential rose every cycle was confirmed. The decomposition of the electrolytic solution is being generated during charging and the capacity in the charging side is bigger than the discharge side. This phenomenon seemed to bring about the change of the lithium quantity inLi_<2.6>Co_<0.4>N.Next, the iodine was affected to the nitride beforehand, and the cell with higher energy density by using the oxidized nitride was made. The Li_<1.37>Co_<0.4>N/LiMn_2O_4 cell capacity of about l00mAhg^<-1> on LiMn_2O_4 and400mAhg^<-1> on Li_<1.37>Co_<0.4>N was obtained, and it was proven to be excellent in the reversibility as well as obtaining very large capacity.