Development of ultra-thin-film batteries and capacitors

在导电衬底上堆积了单层纳米片，并对嵌锂后的电化学电容进行了评估。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了接近理论值的电容。在临界厚度以上，电容随厚度的增加而减小。采用电泳法可以制备出厚度达100 nm的致密、表面平整的钛酸盐纳米片层。通过钛酸盐和锰酸盐纳米薄片的重组，合成了一种混合层化合物。该化合物表现出了单组分化合物所没有的新的充放电性能，由重新堆叠的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表现出高倍率充放电性能。多孔碳和锰酸盐纳米片复合电极也表现出高倍率性能，功率密度超过1kW/kg。制备了由磺化聚醚醚酮和层状磷酸锆层状纳米片组成的质子导电膜。复合膜的耐热性、不溶于水和150℃时的高质子电导率表明，该复合膜是一种很有前途的中温燃料电池候选材料。该化合物具有较大的晶格参数和较小的介电常数，而不是随机取向的B位钙钛矿型氧化物。结果表明，纳米片法能有效地制备出具有新颖结构和性能的介电材料。

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.