Development of ultra-thin-film batteries and capacitors

将单层纳米片堆叠在导电衬底上，并对锂嵌入后的电化学电容进行了评价。在厚度为40 nm的钛酸盐纳米片层和厚度为10 nm的锰酸盐纳米片层中观察到的电容接近理论值。在临界厚度以上，电容随厚度的增加而减小。利用电泳沉积技术可以制备厚度达100纳米的致密、平面钛酸盐纳米片层。通过钛酸盐纳米片和锰酸盐纳米片的重组，合成了一种混合层化合物。该化合物表现出新的充放电特性，这是单组分化合物所没有的。由钛酸盐纳米片和导电碳组成的锂离子电池电极在大电流密度下具有高倍率充放电性能。多孔碳-锰纳米片复合电极也表现出高倍率性能，功率密度超过1 kW/kg。以层状磷酸锆为原料，制备了磺化聚醚醚酮和纳米片组成的质子导电膜。该复合膜在150℃下具有耐热性、不水溶性和高质子导电性，是中温燃料电池的理想材料。制备了两种具有不同b位阳离子的钙钛矿纳米片，并通过重组制备了混合层化合物。与随机b位取向的钙钛矿氧化物相比，化合物具有更大的晶格参数和更小的介电常数。研究表明，纳米片工艺是制备具有新型结构和性能的电介质的有效方法。

Monolayer nanosheets were stacked on a conductive substrate, and electrochemical capacitances by lithium intercalation were evaluated. Capacitances close to the theoretical value were observed in titanate-nanosheet layers up to a thickness of 40 nm and manganate-nanosheet layers up to 10 nm. The capacitances decreased with increasing thickness above the critical thickness. Preparation of dense, flat-surface titanate-nanosheet layers up to 100 nm thickness was possible by use of electrophoretic deposition. A mixed-layer compound was synthesized by reassembly of titanate- and manganate- nanosheets. The compound showed new charge/discharge properties, which are not observed in single-component compounds.Lithium-ion battery electrodes composed of restacked titanate-nanosheets and conductive carbon showed high-rate charge/discharge properties under large current densities. A composite electrode of porous carbon and manganate-nanosheet also showed high-rate properties with a power density above 1 kW/kg.Proton-conductive membranes composed of sulfonated poly(ether ether ketone) and nanosheets delaminated from layered zirconium phosphate were prepared. Heat durability, water insolubility and high proton conductivity at 150℃ indicated the composite membrane to be a promising candidate for intermediate-temperature fuel cells.Two perovskite nanosheets with different B-site cations were prepared, and mixed-layer compounds were synthesized by reassembly of these nanosheets. The compounds had a larger lattice parameter and smaller dielectric permittivity than those of randomly B-site oriented perovskite oxides. Nanosheet process was indicated to be effective to create dielectrics with novel structure and properties.