An Ostwald ripening-based route is proposed to prepare Ni-rich layered cathodes with Co-rich surface for li- thium-ion batteries （LIBs）. Commercially available Nio.aCo0.1 Mn0.8（OH）2 and spray pyrolysis derived por...An Ostwald ripening-based route is proposed to prepare Ni-rich layered cathodes with Co-rich surface for li- thium-ion batteries （LIBs）. Commercially available Nio.aCo0.1 Mn0.8（OH）2 and spray pyrolysis derived porous Co304 are used as mixed precursors. During the lithiation reaction process under high-temperature, the porous Co304 microspheres scatter primary particles and spontaneously redeposit on the surface of Ni-rich spheres according to Ostwald ripening mechanism, forming the Ni-rich materials with Co-rich outer layers. When evaluated as cathode for LIBs, the resultant material shows ability to inhibit the cation disorder, relieves the phase transition from H2 to H3 and diminishes side re- actions between the electrolyte and Ni-rich cathode material. As a result, the obtained material with Co-rich outer layers exhibits much more improved cycle and rate performance than the material without Co-rich outer layers. Particularly, NCM-Co-1 （molar ratio of Nio.sCo0.1Mn0.1（OH）2/Co3Oa is 60：1） delivers a reversible capacity of 159.2 mA h g-1 with 90.5% capacity retention after 200 cycles at 1 C. This strategy pro- rides a general and efficient way to produce gradient sub- stances and to address the surface problems of Ni-rich cathode materials.展开更多
捷克奥斯特拉瓦市的PLATO当代艺术画廊(PLATO Contemporary Art Gallery)是由一座破败的老旧屠宰场改造而成。为了拯救这栋历史建筑,并将其改造成艺术画廊,设计团队提出了一个使艺术更加民主化的方案,以非常规的方式旋转墙体,令艺术能...捷克奥斯特拉瓦市的PLATO当代艺术画廊(PLATO Contemporary Art Gallery)是由一座破败的老旧屠宰场改造而成。为了拯救这栋历史建筑,并将其改造成艺术画廊,设计团队提出了一个使艺术更加民主化的方案,以非常规的方式旋转墙体,令艺术能够走出建筑之外。展开更多
国际上,老的和新的色彩立体图有许多种,但原则上分为两类,即孟赛尔色彩体系（Munsell Color System）和奥斯特瓦德色彩体系（Ostwald Colour System）,这两个主要的色彩体系也是国际学术界公认的色彩体系。美国光学协会色度委员会于193...国际上,老的和新的色彩立体图有许多种,但原则上分为两类,即孟赛尔色彩体系（Munsell Color System）和奥斯特瓦德色彩体系（Ostwald Colour System）,这两个主要的色彩体系也是国际学术界公认的色彩体系。美国光学协会色度委员会于1937年成立了一个专门研究孟赛尔色彩图的分会,展开更多
基金the financial support of the National Basic Research Program of China (2014CB643406)the National Natural Science Foundation of China (51674296, 51574287, 51704332)+1 种基金the National Postdoctoral Program for Innovative Talents (BX201700290)the Fundamental Research Funds for the Central Universities of Central South University (2017zzts125)
文摘An Ostwald ripening-based route is proposed to prepare Ni-rich layered cathodes with Co-rich surface for li- thium-ion batteries （LIBs）. Commercially available Nio.aCo0.1 Mn0.8（OH）2 and spray pyrolysis derived porous Co304 are used as mixed precursors. During the lithiation reaction process under high-temperature, the porous Co304 microspheres scatter primary particles and spontaneously redeposit on the surface of Ni-rich spheres according to Ostwald ripening mechanism, forming the Ni-rich materials with Co-rich outer layers. When evaluated as cathode for LIBs, the resultant material shows ability to inhibit the cation disorder, relieves the phase transition from H2 to H3 and diminishes side re- actions between the electrolyte and Ni-rich cathode material. As a result, the obtained material with Co-rich outer layers exhibits much more improved cycle and rate performance than the material without Co-rich outer layers. Particularly, NCM-Co-1 （molar ratio of Nio.sCo0.1Mn0.1（OH）2/Co3Oa is 60：1） delivers a reversible capacity of 159.2 mA h g-1 with 90.5% capacity retention after 200 cycles at 1 C. This strategy pro- rides a general and efficient way to produce gradient sub- stances and to address the surface problems of Ni-rich cathode materials.
文摘国际上,老的和新的色彩立体图有许多种,但原则上分为两类,即孟赛尔色彩体系（Munsell Color System）和奥斯特瓦德色彩体系（Ostwald Colour System）,这两个主要的色彩体系也是国际学术界公认的色彩体系。美国光学协会色度委员会于1937年成立了一个专门研究孟赛尔色彩图的分会,
