STADIES FOR SYNTHESIS OF LAYERED SOLIDE SOLUTION TYPE CATHODE MATERIALS AND ITS ELECTROCHEMICAL LITHIUM INTERCLATION BEHAVIOR.

层状固溶体型正极材料的合成及其电化学嵌锂行为的研究。

基本信息

批准号：
13450358
负责人：
MASAKI Yoshio
金额：
$ 5.95万
依托单位：
Saga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450358/
关键词：
LITHIUM ION BATTERY CATHODE MATERIAL SOLID SOLUTION LAYERED STRACTURE LiCrO_2 LiNiO_2 Li_2MnO_3 Li_2TiO_3 3>O_3 Li_2TiO_3 正極材料リチウム電子 LiNiO_2 LiCrO_2 Li_2MnO_3

项目摘要

It is found that layered LiNiO_2 forms electroactive solid solution with similar layered Li_2MnO_3 in the all composition range. Though low temperature phase Li_2TiO_3 has same structure with Li_2MnO_3, the structure of solid solution between LiNiO_2 and Li_2TiO_3 changes from layered structure to rock salt structure as the increase in Ti content because of enhanced cation mixing. On the other hand, LiCrO_2 forms layered solid solution with Li_2TiO_3. The solid solution with Ni/Ti=1 shows largest capacity of more than 170 mAh/g. It is finally confirmed that LiCrO_2-Li_2MnO_3 and LiCrO_2-Li_2TiO_3 solid solutions have similar electrochemical and crystallographic properties, however, LiNiO_2-Li_2MnO_3 system is different from LiNiO_2-Li_2TiO_3 system in both character.LiNiXMn_yCo_<1-x-y>O_2 with lower Mn content of y<0.5 is electroactive material. LiNi_<1/3>Mn_<1/3>Co_<1/3>O_2 with high capacity is a typical compound among LiNi_xMn_yCo_<1-x-y>O_2 and it will be considered as a solid solu … More tion between LiNi_<1/2>Mn_<1/2>O_2 and LiCoO_2. Electrochemical property of LiNi_<1/3>Mn_<1/3>Co_<1/3>O_2 extremely depends on preparation process, and we have found that the battery performance can be predicted from the shape of initial charge curve. The essential reason for lower performance would be due to the presence of impurity, NiO, as a result, electroactive solid solution with Li_2MnO_3, which shows lower performance than pure LiNi_<1/3>Mn_<1/3>Co_<1/3>O_2, is formed.The research for LiNi_<1/2>Mn_<1/2-x>Ti_xO_2 has been carried out in order to clarify the difference between Mn and Ti in the formation of solid solution. In the course of study, complete Ti substituted compound, LiNi_<1/2>Mn_<1/2-x>Ti_xO_2 with rock salt structure, delivers more than 150 mAh/g at 50 ℃. This fact indicates the possibility of excellent cathode materials with rock salt structure, which has been considered unsuitable because of difficulty in Li diffusion. This finding would lead to the development of rock salt type electrode materials. The new material shows low reproducibility in electrochemical property at room temperature, however, enhanced properties are confirmed by the formation of solid solution with Li_2TiO_3. Less

发现分层linio_2在所有组成范围内具有相似的分层li_2mno_3形成电活性固体解决方案。尽管低温阶段LI_2TIO_3与LI_2MNO_3具有相同的结构，但由于增强的阳离子混合，linio_2和lio_2tio_3之间实心解决方案的结构从分层结构变为岩盐结构，因为Ti含量的增加。另一方面，LICRO_2用LI_2TIO_3形成分层实心解决方案。 Ni/Ti = 1的实心溶液显示最大的容量大于170 mAh/g。最终证实，LICRO_2-LI_2MNO_3和LICRO_2-LI_2TIO_3实心解决方案具有相似的电化学和晶体学特性，但是，Linio_2-li_2mno_3 System与Linio_2-Li_2-li_2tio_3系统不同。材料。 Lini_ <1/3> Mn_ <1/3> CO_ <1/3> O_2具有高容量的O_2是Lini_xmn_yco_ <1-x-Y> O_2中的典型化合物，它将被视为固体溶液…lini_ <1/2> Mn_ <1/2> Mn_ <1/2> mn_ <1/2> o_2> o_2> o_2 and lineOOO_2。 Lini_ <1/3> Mn_ <1/3> CO_ <1/3> O_2的电化学特性极大地取决于准备过程，我们发现可以从初始充电曲线的形状预测电池性能。降低性能的基本原因将是由于杂质的存在，NIO，结果是用Li_2Mno_3的电活性固定解决方案，其性能低于纯Lini_ <1/3> Mn_ <1/3> Mn_ <1/3> CO_ <1/3> O_2，形成了lini_ <1/2> mn_ <1/2> mn_ <1/2-2-2的研究。 Mn和Ti在固体溶液的形成中。在研究过程中，完整的Ti取代化合物，Lini_ <1/2> Mn_ <1/2-X> Ti_xo_2带有岩石盐结构，在50℃时提供了超过150 mAh/g。这一事实表明了具有岩盐结构的优质阴极材料的可能性，由于LI差异的困难，这被认为不合适。这一发现将导致岩盐型电极材料的发展。新材料在室温下显示出电化学性能的可重复性较低，但是，通过用li_2tio_3形成实心溶液来确认性能。较少的