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Mitigation of voltage decay in Li-rich layered oxides as cathode materials for lithium-ion batteries

Nano Research 2020年第1期13卷 151-159页

作者： Wenhui Hu Youxiang Zhang ling zan Hengjiang Cong College of Chemistry and Molecular Sciences Wuhan UniversityWuhan430072China Shenzhen Research Institute of Wuhan University Shenzhen518000China

Lithium-rich layered oxides(LLOs)have been extensively studied as cathode materials for lithium-ion batteries(LIBs)by researchers all over the world in the past decades due to their high specific capacities and high charge-discharge ***,as cathode materials LLOs have disadvantages of significant voltage and capacity decays during the charge-discharge *** was shown in the past that fine-tuning of structures and compositions was critical to the performances of this kind of *** this report,LLOs with target composition of Li1.17Mn0.50Ni0.24Co0.09O2 were prepared by carbonate co-precipitation method with different pH values.X-ray powder diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscope(TEM),and electrochemical impedance spectroscopies(EIS)were used to investigate the structures and morphologies of the materials and to understand the improvements of their electrochemical *** the pH values increased from 7.5 to 8.5,the Li/Ni ratios in the compositions decreased from 5.17 to 4.64,and the initial Coulombic efficiency,cycling stability and average discharge voltages were gained ***,the material synthesized at pH=8.5 delivered a reversible discharge capacity of 263 mAhg−1 during the first cycle,with 79.0%initial Coulombic efficiency,at the rate of 0.1 C and a superior capacity retention of 94%after 100 cycles at the rate of 1 ***,this material exhibited an initial average discharge voltage of 3.65 V,with a voltage decay of only 0.09 V after 50 charge-discharge *** improved electrochemical performances by varying the pH values in the synthesis process can be explained by the mitigation of layered-to-spinel phase transformation and the reduction of solid-electrolyte interface(SEI)*** hope this work can shed some light on the alleviation of voltage and capacity decay issues of the LLOs cathode materials.

关键词： lithium ion batteries cathode lithium-rich layered oxides voltage decay Li1.17Mn0.50Ni0.24Co0.09O2

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Geochemical characteristics and origin of reservoir bitumens from Well Zhong 1 in the Katake Uplift,Tarim Basin

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Chinese Journal Of Geochemistry 2011年第3期30卷 398-404页

作者： TANG Youjun zan ling Department of Geochemistry Key Laboratory of Exploration Technologies for Oil and Gas Resources Yangtze University Jingzhou 434023 China Faculty of Natural Resources & Information Technology China University of Petroleum Beijing 102249 China

The source of marine crude oils from Tarim Basin is still ***,research on the reservoir bitumens may provide a piece of new evidence to elucidate oil *** characteristics of reservoir bitumens from different strata from Well Zhong 1 in the Katake Uplift were discussed here in ***/Ph ratios of reservoir bitumen from Well Zhong 1 range from 1.14 to 1.39,CPI ratios from 1.01 to 1.08,which indicates no odd-even predominance of normal alkanes,with OEP ratios ranging from 0.98 to *** contents of gammacerane and C28 sterane of reservoir bitumen from Well Zhong 1 are low,while dibenzothiophene series are ***-ane isomerization maturity parameter and Ts/(Ts+Tm) ratio indicate that the reservoir bitumen from Well Zhong1 is mature to highly *** on the differences in biomarker distribution,it is concluded that reservoir bitumen from Well Zhong 1,of which molecular parameters are contrary to those in Cambrian oil from Well Tadong 2,origi-nated from the Upper Ordovician source rocks.

关键词：地球化学特征塔里木盆地储层沥青隆起起源成熟度参数二苯并噻吩生物标志物

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Molecular fossils and sources of Cambrian heavy oil of Well Tadong-2 in theTarim Basin,Xinjiang,China

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Chinese Journal Of Geochemistry 2009年第3期28卷 314-319页

作者： TANG Youjun zan ling Key Laboratory of Exploration Technologies for Oil and Gas Resources Department of Geochemistry Yangtze University Jingzhou 434023 China Faculty of Natural Resources ＆ Information Technology China University of Petroleum Beijing 102249 China

Research on the molecular fossil characteristics of heavy oil from Well Tadong-2 is of great importance to constrain the source of marine crude oils in the Tarim Basin, Xinjiang, China. The authors synthetically applied the isotope mass spectrograph, chromatography and chromatography-mass spectrography to the studies of molecular fossil characteristics of heavy oil from Well Tadong-2 in the Tarim Basin, and the results obtained revealed that heavy oil from Well Tadong-2 is characterized by high gammacerane, high C28 sterane, low rearranged sterane and high C27-triaromatic steroid, these characteristics are similar to those of Cambrian-Lower Ordovician source rocks, demonstrating that Cambrian crude oils came from Cambrian-Lower Ordovician source rocks; condensed compounds (fluoranthene, pyrene, benzo[a]anthracene, bow, benzo fluoranthene, benzopyrene) of high abundance were detected in heavy oil from Well Tadong-2, and the carbon isotopic values of whole oil are evidently heavy, all the above characteristics revealed that hydrocarbons in the crude oils became densified in response to thermal alteration.

关键词：分子化石重油井塔新疆中国 m盆地同位素质谱仪塔里木盆地

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Spinel-layered integrate structured nanorods with both high capacity and superior high-rate capability as cathode material for lithium-ion batteries

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Nano Research 2017年第2期10卷 556-569页

作者： Huibing He Hengjiang Cong Ya Sun ling zan Youxiang Zhang College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

Spinel phase LiMn2O4 was successfully embedded into monoclinic phase layered- structured Li2MnO3 nanorods, and these spineMayered integrate structured nanorods showed both high capacities and superior high-rate capabilities as cathode material for lithium-ion batteries （LIBs）. Pristine Li2MnO3 nanorods were synthesized by a simple rheological phase method using α-MnO2 nanowires as precursors. The spinel-layered integrate structured nanorods were fabricated by a facile partial reduction reaction using stearic acid as the reductant. Both structural characterizations and electrochemical properties of the integrate structured nanorods verified that LiMn2O4 nanodomains were embedded inside the pristine Li2MnO3 nanorods. When used as cathode materials for LIBs, the spineMayered integrate structured Li2MnO3 nanorods （SL-Li2MnO3） showed much better performances than the pristine layered-structured Li2MnO3 nanorods （L-Li2MnO3）. When charge-discharged at 20 mA.g-1 in a voltage window of 2.0-4.8 V, the SL-Li2MnO3 showed discharge capacities of 272.3 and 228.4 mAh.g-1 in the first and the 60th cycles, respectively, with capacity retention of 83.8%. The SL-Li2MnO3 also showed superior high-rate performances. When cycled at rates of 1 C, 2 C, 5 C, and 10 C （1 C = 200 mA-g-1） for hundreds of cycles, the discharge capacities of the SL-Li2MnO3 reached 218.9, 200.5, 147.1, and 123.9 mAh-g-1, respectively. The superior performances of the SL-Li2MnO3 are ascribed to the spineMayered integrated structures. With large capacities and superior high-rate performances, these spinel-layered integrate structured materials are good candidates for cathodes of next-generation high-power LIBs.

关键词： lithium-ion batteries cathode layered-spinel integrated structure Li2MnO3 nanorods

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The geochemical characteristics and oil-source rock correlation of oilshow from the Majiashan profile, Chaoxian County, South of Anhui Province

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Chinese Journal Of Geochemistry 2008年第1期27卷 53-57页

作者： TANG Youjun WEN Zhigang zan ling Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of Education Department of Geochemistry Yangtze University Jingzhou 434023 China Faculty of Resources and Information Technology China University of Petroleum Beijing102249 China

In the future time the exploration of marine oil and gas will be one of the significant domains in China. In this paper the biomarker assemblage characteristics of oilshow in the Nanlinghu Formation of the Majiashan pro- file, which is located in Chaoxian County, south of Anhui Province, are described in the light of gas chromatogra- phy/mass spectrometric (GCMS) analysis on the qualitative and quantitative basis. Based on the investigation of the biomarker assemblage characteristics of possible source rocks developed in the area studied, a conclusion is drawn that the oilshow was generated from the Nanlinghu Formation source rocks (abbreviated as T1n), instead of the Qixia Formation source rocks (abbreviated as P1q). It is pointed out that the T1n is of strong potential for future oil explora- tion, and therefore much attention should be paid to it.

关键词：地理特征岩石油-水系统安徽省

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A Novel Polymethyl Methacrylate (PMMA)-TiO_2 Nanocomposite and Its Thermal and Photic Stability

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Wuhan University Journal of Natural Sciences 2006年第2期11卷 415-418页

作者： zan ling LIU Zhongshi FA Wenjun PENG TianYou College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei China

A new kind of polymethyl methacrylate （PMMA）-TiO2 nanocomposite was synthesized through polymerization. The thermal and photic stability of this PMMA TiO2 nanocomposites were investigated. The as prepared samples were characterized by scanning electron microscopy （SEM）, UV-Vis spectroscopy, differential thermal analysis （DTA） and the photo-induced weight loss, The results show that the photostability of the PMMA-TiO2 nanocomposite is higher than that of the pure PMMA under UV-light irradiation, The weight loss of the pure PMMA reaches 30 % after 300 h UVirradiation, while the composite only 0.3% under the identical experimental condition. The glass transition temperature （TR） of pure PMMA is only 80℃, while the Tg of the composite reaches 258℃. Compared with pure PMMA, the thermal stability of the composite is greatly enhanced.

关键词： polymethyl methacrylate ( PMMA )-TiO2 nanoeomposite polymerization thermal and photic stability

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A study on hydrocarbon generation potential of deep source rocks and gas sources in Changling Fault Depression,Songliao Basin

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Chinese Journal Of Geochemistry 2011年第2期30卷 255-263页

作者： zan, ling Zhang, Zhihuan Fei, Jiajia Wu, Yuyuan Zhang, Zhenying Qin, Liming Mei, ling Li, Wenhao State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China East China Branch of SINOPEC Nanjing 210011 China Beijing Economic Management Institute Beijing 100102 China

Through natural gas exploration in the Changling Fault Depression,abundant natural gas flows were obtained and high-quality source rocks were also *** on bulk analyses,organic matter abundance,organic matter type and thermal maturity of the source rocks were studied *** the same time,gas gener-ating intensity and gas generating quantity were quantitatively analyzed by using basin modeling *** results indicated that gas source rocks of the Shahezi Formation are characterized by abundant organic matter and dark mudstone distributions and high-over thermal *** possess high gas generating intensity with the biggest value surpassing 500×108 m3/km2,and large gas generating quantity,accounting from 74.40% of the total *** Yingcheng Formation has good gas-source rocks with moderate dark mudstone and relatively high organic *** has type-Ⅲ organic matter and low-over thermal *** gas generating intensity is moderate,between 20×108 and 60×108 m3/*** gas generating quantity is 13.63% of the total *** Huoshiling Formation has relatively good source rocks with limited dark mudstone and low organic *** has type-Ⅲ kerogen and over-thermal *** gas generating quantity is 7.10% of the total *** Denglouku Formation has poor-gas source rocks,and is characterized by undeveloped dark mudstone and low organic matter *** has type-Ⅲ organic matter and low-high thermal *** gases in the Changling Fault Depression mainly originated from the Shahezi Formation,and secondarily from the Yingcheng *** contribution of the Huoshiling Formation gas source rocks is relatively small.

关键词： the Changling Fault Depression dark mudstone the Shahezi Formation hydrocarbon basin modeling

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The formation environment and development modes of Cenozoic source rocks in the Qiongdongnan Basin

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Chinese Journal Of Geochemistry 2012年第4期31卷 431-440页

作者： LI Wenhao ZHANG Zhihuan LI Youchuan FU Ning HUANG Yanran zan ling ZHANG Huimin State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumBeijing 102249China CNOOC Research Institute Beijing 100027China

According to the drilling results,there are three sets of source rocks of the Cenozoic Group in the Qiongdongnan Basin,including the Yacheng Formation transitional facies mudstone,the Oligocene lingshui Formation semi-enclosed marine facies mudstone,and the Miocene neritic-bathyal facies *** hydrocarbon generating conditions of the source rocks in the study area are mainly controlled by sedimentary environment and organic matter *** abundance of organic matter in the Oligocene source rocks which were formed in a low-energy back shore environment is confined by organic matter input and hydrodynamic *** Miocene source rocks formed in the open marine environment lack terrestrial organic matter input,whose organic matter abundance is constrained by the primary production of the ocean and the preservation condition of organic *** addition,the redox conditions are also significant to the formation of source rocks in the study *** to the differences in key factors controlling the development of source rocks in different time periods and structural belts revealed by drilling practice,three development patterns of source rocks have been put *** first one is the transitional facies model featuring a great deal of terrestrial organic matter and weakly hydrodynamic conditions which are apt to develop high effective source rocks in the Yacheng *** second one is the semi-enclosed marine facies featuring abundant terrestrial organic matter,weakly hydrodynamic condition and fine preservation condition in the central depression zone,which are apt to form fine-quality source rocks in the lingshui *** third one is the marine facies model featuring strong hydrodynamics in the shore-shallow area of northern continental shelf and the lack of benthic algae which are against the development of source *** can be predicted that the continental slope is the perfect place to form source rocks where adequate amounts of l

关键词：有效烃源岩琼东南盆地形成环境新生代水动力条件有机质丰度陆源有机质有机物质

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苏北盆地金湖凹陷北港次洼古近系阜宁组二段页岩油富集特征及主控因素

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石油实验地质 2020年第4期42卷 618-624页

作者：昝灵中国石化华东油气分公司勘探开发研究院南京210019

通过解剖苏北盆地金湖凹陷北港次洼古近系阜宁组二段泥灰质页岩油藏,分析了成藏条件,确定富集主控因素。北港泥灰质页岩油藏埋深3660~3735 m,纵向上位于阜二段③~④亚段,属于典型的源储一体型油藏。油藏具有"四高一发育"特征,即高有机... 详细信息

通过解剖苏北盆地金湖凹陷北港次洼古近系阜宁组二段泥灰质页岩油藏,分析了成藏条件,确定富集主控因素。北港泥灰质页岩油藏埋深3660~3735 m,纵向上位于阜二段③~④亚段,属于典型的源储一体型油藏。油藏具有"四高一发育"特征,即高有机质丰度、高演化程度、高脆性矿物、高异常压力、天然裂缝发育。阜二段③~④亚段灰质泥岩和泥灰岩为优质烃源岩,实测有机碳含量平均为1.83%,S1平均为0.59 mg/g,有机质类型为Ⅰ型,Ro为1.1%,成熟度较高。原油的植烷、伽马蜡烷、孕甾烷、三环萜烷含量中等,形成于半咸水的烃源岩。阜二段泥灰岩脆性矿物含量平均为60.7%,以石英、白云石和方解石为主,实测孔隙度4.24%~8.76%,平均为7.04%;③亚段溶蚀孔发育,④亚段天然裂缝发育,声波时差计算压力系数为1.3。大面积分布的优质烃源是页岩油藏形成的物质基础,地质甜点控制页岩油局部富集,高异常压力是页岩油藏高产的关键,阜二段泥灰质页岩油藏具有较好的勘探开发前景。

关键词：页岩油泥灰质页岩形成条件富集特征阜宁组二段北港次洼苏北盆地

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超细TiO_2粉体制备之微波水解法

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武汉大学学报（自然科学版） 2001年第2期47卷 192-194页

作者：刘忠士昝菱武汉大学化学与分子科学学院湖北武汉430072

首次将微波加热法引入 Ti O2 的水解反应中 ,详细比较了传统加热和微波加热对水解产生 Ti O2 粒子的粒度、形貌和晶型的影响 .实验显示 ,同等条件下 ,微波加热得到分散性更好 ,粒径更小 ,金红石晶型含量更高的Ti O2 粒子 .

关键词：微波水解法超细粉体材料二氧化钛微波加热金红石晶型

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