{"id":14,"date":"2024-06-14T13:53:31","date_gmt":"2024-06-14T04:53:31","guid":{"rendered":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/?page_id=14"},"modified":"2024-06-14T18:06:43","modified_gmt":"2024-06-14T09:06:43","slug":"topics","status":"publish","type":"page","link":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/topics\/","title":{"rendered":"TOPICS"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\">Development of new functional materials for next-generation batteries<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">LiFePO<sub>4<\/sub>&nbsp;glass-ceramic cathode for lithium-ion batteries<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">We are proposing a \u201cglass-ceramics method\u201d to fabricate phosphate-based active materials for lithium-ion batteries. In especially LiFePO<sub>4<\/sub>&nbsp;is intensively focused due to their safety performance in lithium cells recently. We succeeded to fabricate LiFePO<sub>4<\/sub>&nbsp;precursor glass and fully crystallized LiFePO<sub>4<\/sub>&nbsp;ceramics. The glass-ceramics technique has the advantage to reduce the raw-materials cost as well as process cost. Fe(III)<sub>2<\/sub>O<sub>3<\/sub>&nbsp;is suitable to make stable precursor glass without any byproducts (HCl, Cl<sub>2<\/sub>, SO<sub>x<\/sub>, NO<sub>x<\/sub>&nbsp;gas and aqueous solution). LiFePO<sub>4<\/sub>&nbsp;glass-ceramics is a promising candidate in next-generation batteries.<br><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"137\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/droppedimage.jpg\" alt=\"\"><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"150\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/pict0052-filtered.jpg\" alt=\"\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Na<sub>2<\/sub>FeP<sub>2<\/sub>O<sub>7<\/sub>&nbsp;for minor-metal free sodium-ion batteries<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">In early 2012, we also developed Na2FeP2O7 new candidate cathode for sodium-ion batteries by the glass-ceramics route. Na2FeP2O7 glass-ceramics cathode exhibits 3.0 V and 91 mAh\/g (at 0.1C for 97 mAh\/g theoretical capacity) for sodium metal anode with non-aqueous electrolyte. Their cyclic performance is well efficiency as 93-96% up to 100 times. Na2FeP2O7 is a promising candidate to realize minor-metal-free batteries.<br><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"150\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/nfp.001.png\" alt=\"\" srcset=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/nfp.001.png 500w, https:\/\/mst.nagaokaut.ac.jp\/amorph\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/nfp.001-300x226.png 300w\"><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"150\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/nfp_ec.002.png\" alt=\"\" srcset=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/nfp_ec.002.png 545w, https:\/\/mst.nagaokaut.ac.jp\/amorph\/en\/wp-content\/uploads\/sites\/2\/2019\/12\/nfp_ec.002-300x225.png 300w\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Development of an all-solid-state sodium-ion battery composed of oxide glass-ceramics<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Recently, Nippon Electric Glass Co., Ltd. and our research group have succeeded in producing an all-solid-state sodium-ion battery that operates at room temperature.<br>Sodium-ion batteries are expected as an alternative to lithium-ion batteries, which are vulnerable to thermal runaway and have problems with rising raw material prices. From the beginning, we believe that an all-solid-state battery using oxides is ideal from a practical viewpoint, and have proposed an all-solid-state battery that utilizes the viscous flow of oxide glass in the manufacturing process. The prototype cell has the following characteristics.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Both electrolyte and the glass-ceramic positive electrode can achieve rare metal-free.<\/li>\n\n\n\n<li>It can be easily joined by co-firing at 550 \u2103.<\/li>\n\n\n\n<li>The prototype all-solid-state battery operates stably without peeling of the bonding interface even when tested over 600 charge-discharge cycles at the time of paper submission.<\/li>\n\n\n\n<li>Extremely high stability against severe overcharge of 9 V.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/img20191120164557006741-1.png\" alt=\"\" class=\"wp-image-114\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Development of position selective crystallization process of glass by laser and its application to develop prototype devices<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Techniques of laser-induced crystallization and development of photonics devices<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/amorph_hp_03.jpg\" alt=\"\" class=\"wp-image-101\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/amorph_hp_04.jpg\" alt=\"\" class=\"wp-image-103\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">We succeeded in the writing of nonlinear optical curved lines at the surface of Sm2O3-Bi2O3-B2O3 glasses by irradiation of continuous-wave Nd:YAG laser. Figure shows the polarization optical microscope image for the crystal-lines with Y-blanched shapes. This technique demonstrating the possibility of the writing of not only optical wave-guides but also optical switch or optical modulator with any designed patterns<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">More complicated structure (2D and 3D structure)<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/ln2d.png\" alt=\"\" class=\"wp-image-105\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">We are trying to make a more complicated structure in glass such as planner crystal and single crystal in glass-fiber. The morphology of crystal architecture depends on the glass-composition, laser condition (power, scanning speeds, times). We show you the micrograph of planner type LiNbO3 single crystal architecture on glass surface fabricated by continuous scanning laser process like an ink-jet printer. Planer LiNbO3 architecture has a c-axis orientation parallel to the scanning direction.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Development of transparent glass-ceramics<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">For Non-linear optics<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/amorph_hp_01.png\" alt=\"\" class=\"wp-image-106\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/amorph_hp_02.png\" alt=\"\" class=\"wp-image-107\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">We developed new glass systems and compositions which lead to the formation of ferroelectric crystals. Optical nonlinear Ba2TiGe2O8 crystals can be formed on BaO-TiO2-GeO2 glass substrates (surface crystallized glass) by conventional heat treatment and indicate self-organized c-axis orientation. Ba2TiGe2O8(BTG) surface crystallized glass is showing a strong second harmonic wave. We found strong optical nonlinearity which is the same as LiNbO3 crystal from BTG surface crystallized glass at first.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Processing techniques of glass<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Assembling of glass materials by chemical processing<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/amorph_hp_05.jpg\" alt=\"\" class=\"wp-image-108\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/mst.nagaokaut.ac.jp\/amorph\/wordpress\/wp-content\/uploads\/2019\/12\/amorph_hp_06.jpg\" alt=\"\" class=\"wp-image-109\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">We are developing a nanofiber probe consist of transparent ferroelectric nano-sized glass ceramics and a U-shaped micro groove formed by a combination of laser irradiation and chemical etching process. We\u2019ve been examined the basic study of assembling using chemical processing for glass and glass-ceramics.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Development of new functional materials for next-generation batteries LiFePO4&nbsp;glass-ceramic cathode for lithium-ion batteries We are proposing a \u201cglass-ceramics method\u201d to fabricate phosphate-based active materials for lithium-ion batteries. In especially LiFePO4&nbsp;is intensively focused due to their safety performance in lithium cells recently. We succeeded to fabricate LiFePO4&nbsp;precursor glass and fully crystallized LiFePO4&nbsp;ceramics. The glass-ceramics technique has [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-14","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/pages\/14","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/comments?post=14"}],"version-history":[{"count":1,"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/pages\/14\/revisions"}],"predecessor-version":[{"id":15,"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/pages\/14\/revisions\/15"}],"wp:attachment":[{"href":"https:\/\/littlemy.nagaokaut.ac.jp\/amorph\/en\/index.php\/wp-json\/wp\/v2\/media?parent=14"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}