MATERIALS DESIGN OF CRYSTALLINE LITHIUM IONIC CONDUCTORS WITH FRAMEWORK STRUCTURE

框架结构晶体锂离子导体材料设计

基本信息

批准号：
09650906
负责人：
KANNO Ryoji
金额：
$ 2.11万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Lithium superionic conductors exhibit high lithium-ionic diffusion in one of their ionic sublattice - the mobile ion sublattice - at temperature well below melting points. It is of great interest to understand their fast-ionic transport in "solid' materials, which is widely recognized, although still relatively rare, phenomenon. They are also of technological importance for future applications as solid electrolyte for all-solid lithium battery and may solve the safety problems of the rechargeable lithium ion battery using non-aqueous liquid electrolytes.Ceramic crystalline electrolytes have advantages over liquid, polymer, gel or even glass electrolytes for their chemical and electrochemical stability. Many attempts to synthesize new ceramic lithium superionic conductors have been made ; the highest conductivity of 10^<-3> S cm^<-1> was previously reported for H-doped Li_3N.However, the low decomposition potential of 0.445V restricts its application as a lithium solid electrolyte. The new thio-LISICON (LIthium SuperIonic CONductor) found in the Li_2S-GeS_2, Li_2S-GeS_2-ZnS, and Li_2S-GeS_2-Ga_2S_3 systems have structures related to the gamma-Li_3PO_4-type. Six new materials were found (Li_2GeS_3, Li_4GeS_4, Li_2ZnGeS_4, Li_<4-x>Zn_xGeS_4, Li_5GaS_4, and Li_<4+x+delta>(Ge_<1-delta'-x>GaS_x)SS_4), and LiS_<4+x+delta>(GeS_3GaS_x)S_4 showed the highest conductivity of 6.5x10^<-5> S cm^<-1> at room temperature. Our results on electrochemical measurements indicated that LiS_<4+x+delta>(Ge_<1-delta'-x>Ga_x)S_4 is stable up to 5V vs. Li.

锂超电子导体在其离子sublatice之一 - 移动离子sublattice中表现出很高的锂离子扩散 - 温度远低于熔点。了解他们在“固体”材料中的快速运输是非常兴趣的，这是广泛认可的，尽管仍然相对罕见，但现象也很罕见。它们对于将来作为全固体锂电池的固体电解质的应用也很重要，并且可能使用非水液体电解质解决可充电锂离子电池的安全问题。培养基晶体电解质比液体，聚合物，凝胶甚至玻璃电解质具有化学和电化学稳定性的优势。先前报道了hoded li_3n的最高电导率为10^<-3> s cm^<-1>。 LISICON（LITHIUM SUPERIONIC导体）在LI_2S-GES_2，li_2s-ges_2-Zns和li_2s-ges_2-ga_2s_3系统中发现的结构与gamma-li_3po_4 type相关。发现了六种新材料（li_2ges_3，li_4ges_4，li_2znges_4，li_ <4-x> zn_xges_4，li_5gas_4，li_5gas_4和li_ <4+x+x+x+delta>（ge_ <1-delta'-x> gas_x）ss_4）和lis_ <4）和lis_ <4 <4） +x+delta>（ges_3gas_x）S_4在室温下显示最高的电导率为6.5x10^<-5> S CM^<-1>。我们对电化学测量结果的结果表明，lis_ <4+x+delta>（ge_ <1-delta'-x> ga_x）s_4稳定在5V vs. vs. li。