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Fabrication and characterization of a lithium conductive multiple layer embedded into a Si substrate

嵌入硅衬底的锂导电多层的制造和表征

基本信息

批准号：
12450016
负责人：
KURIYAMA Kazuo
金额：
$ 6.53万
依托单位：
Hosei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450016/
关键词：
Lithium manganese oxide Lithium cobalt oxide Lithium indium oxide Sol-gel synthesis Lithium secondary battery Porous glass electrolyte Direct wide gap Solar neutrino リチウムコバルト酸化物シリコン酸化物固体電解質 3d準位 Mott型電気伝導ラマン活性モード原子間顕微鏡表面観察マ

项目摘要

Achievements in the present study are summarized as follows:LiMn_2O_4, LiCo-O_2 and LiInO_2 films are synthesized on Si and SiO_2 substrates by spin-coating individual sol-solution originally developed with subsequent annealing processes. Especially, (1) Li atomic array of spinel-LiMn_2O_4 on 0x(3c)1000x(3E)-oriented Si substrate was observed with an atomic force microscopy. (2) Electronic structures of LiMn_2O_4 and LiCoO_2 were experimentally determined by observing the two d-d transitions related to Mn-3d bands and those related to Co-3d, respectively. The Co-3d electronic structure showed a drastic change by the structural transformation from layered rock salt to modified spinel structures. (3) The band-gap of LiInO_2 is found to be direct with a forbidden gap of 4.2 eV and a yellow emission of 2.3 eV was observed by photo- and cathode-luminescence methods, suggesting a candidate as a scintillator for solar-neutrinos by means of self-emitted β-ray resulting from nuclear reaction between the neutrinos and ^<115>In. (5) A parallel connection of multiple layers, consisting of Al / Li / SiO_2-15at%P_2O_5/ LiMn_2O_4 / polycrystalline silicon, are embedded into trenches of 100 × 200 μm^2 on a Si substrate, giving an evidence of battery properties caused by Li^+ ionic conduction.

本文的主要研究成果如下：采用旋涂法制备了LiMn_2O_4、LiCo-O_2和LiInO_2薄膜，并在Si和SiO_2衬底上进行了制备。特别是(1)用原子力显微镜观察到了0x(3c)1000x(3e)取向的Si衬底上尖晶石LiMn_2O_4的Li原子阵列。(2)通过观察与Mn-3d和Co-3d相对应的两个d-d跃迁，实验确定了LiMn2O4和LiCoO2的电子结构。Co-3D电子结构由层状岩盐结构向改性尖晶石结构转变，电子结构发生了剧烈变化。(3)用光致发光法和阴极发光法观察到LiInO_2的禁带宽度为4.2 eV，黄光发射为2.3 eV，这表明LiInO_2是一种利用中微子与In核反应产生的自发射β射线作为太阳中微子闪烁体的候选材料。(5)将Al/Li/SiO_2-15at%P_2O_5/LiMn_2O_4/多晶硅多层并联埋入硅衬底上100×200μm^2的沟槽中，证实了Li~(2+)离子导电对电池性能的影响。