13 research outputs found

    锂离子电池正极材料的研究进展

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     研究与开发新型的电池正极材料是锂离子电池研究中的一项重要内容,目前正极材料的研究主要集中于3种富锂的金属氧化物LiCoO2、LiNiO2和LiMn2O4。本文主要介绍了锂离子电池正极材料的合成方法,同时比较了几种不同电极材料的结构以及电化学性能,指出了其工作特点和存在问题,并对该领域的研究现状进行了简要的综述。本文还介绍了锂离子电池正极材料计算研究的进展。利用VASP软件包可计算形成能、相图、电压和材料的晶体结构参数及态密度等

    Examination and training model of Doctor of Nursing in Yale university

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    文章通过对耶鲁大学护理博士研究生考核培养模式的现状和特点进行分析研究,包括其护理博士学位的特点、招生要求、培养方式和考核方式。并在此基础上提出了对我国的启示,以此形成适合我国国情的护理博士培养模式。The article introduced the current status and characteristics of examination and training model of Doctor of Nursing in Yale university,including the characteristics of doctor degree of nursing,enrollment requirement,teaching and examination mode.On the basis,enlightenment on training model of Doctor of Nursing in China was put forward

    锂离子电池正极材料的研究进展

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    【中文摘要】研究与开发新型的电池正极材料是锂离子电池研究中的一项重要内容,目前正极材料的研究主要集中于3种富锂的金属氧化物LiCoO2、LiNiO2和LiMn2O4。本文主要介绍了锂离子电池正极材料的合成方法,同时比较了几种不同电极材料的结构以及电化学性能,指出了其工作特点和存在问题,并对该领域的研究现状进行了简要的综述。本文还介绍了锂离子电池正极材料计算研究的进展。利用VASP软件包可计算形成能、相图、电压和材料的晶体结构参数及态密度等。 【Abstract】It has become one of important topics to research and develop the cathode materials for lithium (Li) ion batteries. Current investigations focused mainly on three types of Li-rich metal oxides , LiCoO2,LiNiO2 and LiMn2O4. In this article, the synthesis methods of cathode materials for Li-ion batteries were summarized. The structures and electrochemical performances of several different cathode materials were compared. The characteristics and problems associated with the cathode materials were pointed out. In addition to provide a brief overview of the current research activities in the field of cathode materials , the progress in the field via a computational approach was also reviewed. The formation energy ,phase diagram, voltage , crystal structural parameter and density of state can be calculated using VASP software package

    合成气氛对LiNi_(0.75)Co_(0.25)O_2性能的影响

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    利用溶胶-凝胶方法分别在氧气和空气气氛下合成了锂离子蓄电池正极材料LiNi0.75Co0.25O2,并对该材料进行了XRD分析、Rieveld结构精修以及电化学测试,初步探讨了合成气氛对LiNi0.75Co0.25O2结构及其电化学性能的影响。结果证实,当采用溶胶-凝胶预处理固相合成方法时,在氧气气氛下合成的锂离子蓄电池正极材料LiNi0.75Co0.25O2的电化学性能要好于在空气中合成的LiNi0.75Co0.25O2,并通过对该材料进行Rieveld结构精修进一步解释了该现象

    合成气氛对LiNi_(0.75)Co_(0.25)O_2性能的影响

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    利用溶胶-凝胶方法分别在氧气和空气气氛下合成了锂离子蓄电池正极材料LiNi0.75Co0.25O2,并对该材料进行了XRD分析、Rieveld结构精修以及电化学测试,初步探讨了合成气氛对LiNi0.75Co0.25O2结构及其电化学性能的影响。结果证实,当采用溶胶-凝胶预处理固相合成方法时,在氧气气氛下合成的锂离子蓄电池正极材料LiNi0.75Co0.25O2的电化学性能要好于在空气中合成的LiNi0.75Co0.25O2,并通过对该材料进行Rieveld结构精修进一步解释了该现象

    常温货架期间油桃果实不同部位对1-MCP的响应

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    采用1-MCP对油桃进行处理,于果顶和赤道两个部位取样,研究其对1-MCP的响应及对常温(25℃)货架品质的影响。结果表明,1-MCP处理可有效抑制油桃果实的软化,特别是延缓果顶部位的软化,降低其呼吸强度、VC含量、纤维素酶、多聚半乳糖醛酸酶活性,提高果实还原糖和可滴定酸含量,但对可溶性固形物含量、色差、果胶含量、果胶甲酯酶活性无显著影响
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