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Synergistic effect from coaxially integrated CNTs@MoS_(2)/MoO_(2) composite enables fast and stable lithium storage

Journal of Energy Chemistry 2021年第4期30卷 449-458页

作者： Hui Lu Kai Tian Liangmin Bu Xue Huang Xiangyi Li Yue Zhao Feng Wang jianming bai Lijun Gao Jianqing Zhao College of Energy Soochow Institute for Energy and Materials InnovationSSoochow UniversitySuzhou 215006JiangsuChina Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006JiangsuChina Sustainable Energy Technologies Department Brookhaven National LaboratoryUpton 11973NYUnited States National Synchrotron Light Source II Brookhaven National LaboratoryUpton 11973NYUnited States

Molybdenum oxide/sulfide materials are extensively evaluated as high-capacity anode candidates for lithium ion ***,they suffer from rapid capacity decay and poor ***,we report on synergistic effect from structurally integrated coaxial CNTs@MoS_(2)/MoO_(2) composite material on lithium storage,in which MoS_(2)/MoO_(2) nanosheets are conformally decorated on carbon nanotubes(CNTs).In-situ synchrotron X-ray diffraction measurement is performed to elucidate synergistic effect among three MoS_(2),MoO_(2) and CNTs components for lithium *** mechanism exploration reveals that the MoO_(2) component undergoes reversible Li^(+)intercalation via forming a stable Li_(0.98) MoO_(2) phase over a voltage range of 3.0 to 0.01 V ***^(+)/Li,without experiencing the conversion reaction into metallic Mo,which contributes to long-term stability during charge/discharge ***,lithium storage of MoS_(2) is through lithium and sulfur reversible reaction after the initial conversion reaction of lithiated MoS_(2) forming Li_(2)S and *** CNTs component enhances electronic conductivity and structural stability by minimizing volume change and reaction strains in the CNTs@MoS_(2)/MoO_(2) composite anode.A desired 68.2%capacity retention upon 2000 cycles at 10 A/g has been demonstrated for the CNTs@MoS_(2)/MoO_(2) anode,revealing prominent reaction kinetics and structural stability for fast and stable lithium storage,superior to various Mo-based anode materials previously *** findings from this study,with the unique insight into the role of structural integrity in combining MoS_(2)/MoO_(2) materials with the CNTs substrate,offers a strategy for designing composite anode materials for superior lithium storage performance.

关键词： MoS_(2)/MoO_(2) CNTs Synergistic effect Anode material Lithium storage

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Atomic-scale structural and chemical evolution of Li3V2(PO4)3 cathode cycled at high voltage window

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Nano Research 2019年第7期12卷 1675-1681页

作者： Shulin Chen Jian Zou Yuehui Li Ning Li Mei Wu Jinghuang Lin Jingmin Zhang Jian Cao Jicai Feng Xiaobin Niu jianming bai Junlei Qi Peng Gao Liping Wang Hong Li School of Materials and Energy State Key Laboratory of Electronic Thin Film and Integrated DevicesUniversity of Electronic Science and Technology oj ChinaChengdu 610054China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Electron Microscopy Laboratory School of PhysicsPeking UniversityBeijing 100871China National Synchrotron Light Source II Brookhaven National LaboratoryUptonNew York 11973USA Collaborative Innovation Center of Quantum Matter Beijing 100871China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Here,by using atomically resolved scanning transmission electron microscopy and electron energy loss spectroscopy,we investigate the structural and chemical evolution of Li3V2(PO4)3 (LVP) upon the high-voltage window (3.0-4.8 V).We find that the valence of vanadium gradually increases towards the core corresponding to the formation of electrochemically inactive Li3-xV2(PO4)3 (L3-xVP) *** Li-deficient phases exhibit structure distortion with superstructure stripes,likely caused by the migration of the vanadium,which can slow down the lithium ion diffusion or even block the diffusion *** kinetic limitations lead to the formation of Li-deficient phase along with capacity ***,the LVP continuously losses of electrochemical activity and Li-deficient phases gradually grow from the particle core towards the surface during *** 500 cycles,the thickness of active LVP layer decreases to be - 5-20 ***,the micromorphology and chemical composition of solid electrolyte interphase (SEI) have been investigated,indicating the thick SEI film also contributes to the capacity *** present work reveals the structural and chemical evolution in the cycled electrode materials at an atomic scale,which is essential to understand the voltage fading and capacity decaying of LVP cathode.

关键词： lithium-ion batteries Li-deficient lithium vanadium phosphate capacity fading solid electrolyte interphase scanning transmission electron microscopy electron energy loss spectroscopy

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Ambient synthesis, characterization, and electrochemical activity of LiFePO4 nanomaterials derived from iron phosphate intermediates

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Nano Research 2015年第8期8卷 2573-2594页

作者： Jonathan M. Patete Megan E. Scofield Vyacheslav Volkov Christopher Koenigsmann Yiman Zhang Amy C. Marschilok Xiaoya Wang jianming bai Jinkyu Han Lei Wang Feng Wang Yimei Zhu Jason A. Graetz Stanislaus S. Wong Department of Chemistry State University of New York at Stony Brook Stony Brook NY 77794-3400 USA Condensed Matter Physics and Materials Sciences Department Building 480 Brookhaven National Laboratory Upton NY 11973 USA Department of Materials Science and Engineering State University of New York at Stony Brook Stony Brook NY 11794-2275 USA Sustainable Energy Technologies Department Building 815 Brookhaven National Laboratory Upton NY 11973 USA National Synchrotron Light Source II Building 741 Brookhaven National Laboratory Upton NY 11973 USA

LiFePO4 materials have become increasingly popular as a cathode material due to the many benefits they possess including thermal stability, durability, low cost, and long life span. Nevertheless, to broaden the general appeal of this material for practical electrochemical applications, it would be useful to develop a relatively mild, reasonably simple synthesis method of this cathode material. Herein, we describe a generalizable, 2-step methodology of sustainably synthesizing LiFePO4 by incorporating a template-based, ambient, surfactantless, seedless, U-tube protocol in order to generate size and morphologically tailored, crystalline, phase-pure nanowires. The purity, composition, crystallinity, and intrinsic quality of these wires were systematically assessed using transmission electron microscopy （TEM）, high-resolution TEM （HRTEM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, selected area electron diffraction （SAED）, energy dispersive analysis of X-rays （EDAX）, and high-resolution synchrotron XRD. From these techniques, we were able to determine that there is an absence of any obvious defects present in our wires, supporting the viability of our synthetic approach. Electrochemical analysis was also employed to assess their electrochemical activity. Although our nanowires do not contain any noticeable impurities, we attribute their less than optimal electrochemical rigor to differences in the chemical bonding between our LiFePO4 nanowires and their bulk-like counterparts. Specifically, we demonstrate for the first time experimentally that the Fe-O3 chemical bond plays an important role in determining the overall conductivity of the material, an assertion which is further supported by recent ＂first-principles＂ calculations. Nonetheless, our ambient, solution-based synthesis technique is capable of generating highly crystalline and phase-pure energy-storage-relevant nanowires that can be tailored so as to fabricate different sized materials of repro

关键词： ambient synthesis template synthesis cathode material lithium iron phosphate nanostructures

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Unveiling the parasitic-reaction-driven surface reconstruction in Ni-rich cathode and the electrochemical role of Li_(2)CO_(3)

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Journal of Energy Chemistry 2023年第10期85卷 126-136,I0006页

作者： Jiyu Cai Zhenzhen Yang Xinwei Zhou Bingning Wang Ana Suzana jianming bai Chen Liao Yuzi Liu Yanbin Chen Shunlin Song Xuequan Zhang Li Wang Xiangming He Xiangbo Meng Niloofar Karami Baasit Ali Shaik Sulaiman Natasha A.Chernova Shailesh Upreti Brad Prevel Feng Wang Zonghai Chen Chemical Sciences and Engineering Division Argonne National Laboratory9700 South Cass AvenueLemontIL 60439USA Center for Nanoscale Materials Argonne National Laboratory9700 South Cass AvenueLemontIL 60439USA Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA Energy and Photon Sciences Directorate Brookhaven National LaboratoryUptonNY 11973USA Beijing Easprint Material Technology Co.Ltd. Beijing 100160China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering University of ArkansasFayettevilleAR 72701USA Charge CCCV(C4V) 45 Murray Hill RoadCenter of ExcellenceBinghamton UniversityVestalNY 13850USA Primet Precision Materials 950 Danby RoadIthacaNY 14850USA Applied Materials Division Argonne National Labo

Nickel-rich transition-metal oxides are widely regarded as promising cathode materials for high-energydensity lithium-ion batteries for emerging electric vehicles. However, achieving high energy density in Ni-rich cathodes is accompanied by substantial safety and cycle-life obstacles. The major issues of Ni-rich cathodes at high working potentials are originated from the unstable cathode-electrolyte interface, while the underlying mechanism of parasitic reactions towards surface reconstructions of cathode materials is not well understood. In this work, we controlled the Li_(2)CO_(3) impurity content on LiNi_(0.83)Mn_(0.1)Co_(0.07)O_(2) cathodes using air, tank-air, and O_(2) synthesis environments. Home-built high-precision leakage current and on-line electrochemical mass spectroscopy experiments verify that Li_(2)CO_(3) impurity is a significant promoter of parasitic reactions on Ni-rich cathodes. The rate of parasitic reactions is strongly correlated to Li_(2)CO_(3) content and severe performance deterioration of Ni83 *** post-mortem characterizations via high-resolution transition electron microscope and X-ray photoelectron spectroscopy depth profiles reveal that parasitic reactions promote more Ni reduction and O deficiency and even rock-salt phase transformation at the surface of cathode materials. Our observation suggests that surface reconstructions have a strong affiliation to parasitic reactions that create chemically acidic environment to etch away the lattice oxygen and offer the electrical charge to reduce the valence state of transition metal. Thus, this study advances our understanding on surface reconstructions of Nirich cathodes and prepares us for searching for rational strategies.

关键词： Ni-rich cathodes Surface reconstructions Phase transformation Parasitic reactions Li_(2)CO_(3)

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浅议行业科技期刊的广告经营工作

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中国煤炭 2007年第4期33卷 31-31,45页

作者：白建明煤炭信息研究院

我国有众多的行业科技期刊,其广告收入是刊物生存和发展的重要经济来源.与社会类的大众刊物相比,科技期刊经营广告起步较晚,而且存在专业性强、读者面窄、发行量小、版面风格单调等不足,在竞争中优势不明显.但是行业科技期刊在承揽广告... 详细信息

我国有众多的行业科技期刊,其广告收入是刊物生存和发展的重要经济来源.与社会类的大众刊物相比,科技期刊经营广告起步较晚,而且存在专业性强、读者面窄、发行量小、版面风格单调等不足,在竞争中优势不明显.但是行业科技期刊在承揽广告业务时,也具有两个方面的优势:一是拥有长期相对固定的行业读者群,他们既是期刊的阅读者,又是该领域产品的消费者,因此在选购相关产品时,科技期刊多是他们寻找信息的首选;二是行业科技期刊都有自身特别的发行渠道,通过好的广告发布方案可以把销售的环节缩短,达到立竿见影的效果,使广告客户及时收益.行业科技期刊在开展广告业务时,要充分发挥自身的优势才能取得好的效果.

关键词：科技期刊广告收入经营工作行业广告业务相关产品发行量读者群

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日粮添加不同水平酵母硒对肉羊生长性能、肉品质及血液生化指标的影响

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中国饲料 2021年第17期 75-79页

作者：柏建明甘肃省天水市动物技术工作站甘肃天水741000

为研究酵母硒(SY)对肉羊生长性能、肉品质及血液生化指标的影响,试验选择80只体况良好、体重(26.18±2.00)kg的肉羊随机分成4组,每组4个重复,每个重复5只羊。对照组饲喂基础日粮,酵母硒组在基础日粮中分别添加0.2、0.3、0.4 mg/kg的SY... 详细信息

为研究酵母硒(SY)对肉羊生长性能、肉品质及血液生化指标的影响,试验选择80只体况良好、体重(26.18±2.00)kg的肉羊随机分成4组,每组4个重复,每个重复5只羊。对照组饲喂基础日粮,酵母硒组在基础日粮中分别添加0.2、0.3、0.4 mg/kg的SY。预饲期7 d,试验正式期10周。结果表明:日粮中添加0.3 mg/kg酵母硒组肉羊的平均日增重显著高于对照组(P<0.05),提高了17.88%。日粮中添加0.3 mg/kg酵母硒组肉羊的料重比显著低于对照组和0.4 mg/kg酵母硒组(P<0.05),分别降低了11.31%和16.05%。日粮中添加0.3 mg/kg和0.4 mg/kg酵母硒组肉羊的肉色红度a^(*)显著高于对照组(P<0.05),分别提高了10.51%和13.79%;日粮中添加0.3 mg/kg和0.4 mg/kg酵母硒组的pH45 min显著高于对照组(P<0.05),分别提高了6.11%和4.98%;日粮中添加0.3 mg/kg酵母硒组的剪切力显著低于对照组和0.4 mg/kg酵母硒组(P<0.05),分别降低了10.92%和13.42%;日粮中添加0.3 mg/kg酵母硒组的熟肉率显著高于对照组和0.4 mg/kg酵母硒组(P<0.05),分别提高了4.82%和7.43%。日粮中添加0.3 mg/kg和0.4 mg/kg酵母硒组的总蛋白含量显著高于对照组(P<0.05),分别提高了8.49%和12.59%;日粮中添加0.4 mg/kg酵母硒组的尿素氮和肌酐含量显著高于对照组、0.2 mg/kg酵母硒组、0.3 mg/kg酵母硒组(P<0.05),分别提高了11.67%、12.84%、14.78%;18.90%、15.10%、11.67%。综上所述,在肉羊日粮中添加酵母硒可以提高其生长性能,改善肉品质,并提高血液中总蛋白含量,本试验条件下,最适添加量为0.3 mg/kg。

关键词：酵母硒生长性能肉品质血液生化指标肉羊

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Fe-Nd-Al系非晶合金条带的磁性机理

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稀有金属材料与工程 2016年第11期45卷 2878-2883页

作者：何建明白琴赵清徐晖夏爽上海大学微结构重点实验室上海200444

对Fe_(53)Nd_(37)Al_(10)合金甩带速度为40和20 m/s条带样品的磁性能、磁粘滞行为和微观结构进行研究,分析了该合金条带的矫顽力机理。结果表明:Fe_(53)Nd_(37)Al_(10)合金甩带速度为40和20 m/s条带样品的剩余磁化强度M_r分别为33.50和3... 详细信息

对Fe_(53)Nd_(37)Al_(10)合金甩带速度为40和20 m/s条带样品的磁性能、磁粘滞行为和微观结构进行研究,分析了该合金条带的矫顽力机理。结果表明:Fe_(53)Nd_(37)Al_(10)合金甩带速度为40和20 m/s条带样品的剩余磁化强度M_r分别为33.50和36.05(A·m^2)·kg^(-1),矫顽力_iH_c为62.00和121.50 kA/m。40 m/s条带样品的热涨落场H_f,激活体积V_a和激活直径D_a分别为2.47 m T,3.90×10^(-18)cm^3和19.53nm;而20 m/s条带样品为2.73 mT,3.53×10^(-18)cm^3和18.89 nm。40 m/s条带样品里面存在直径小于5 nm的纳米团簇,而20 m/s条带样品的纳米团簇直径为5~10 nm,且纳米团簇数量更多。Fe-NdAl非晶条带里面同时存在交换耦合和钉扎2种作用,纳米团簇的尺寸和数量,以及多个团簇组成的作用单元是影响非晶条带矫顽力的主要原因。

关键词：磁粘滞行为交换耦合钉扎作用

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小额索赔情形下现代风险模型的破产概率上界

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系统工程学报 2015年第1期30卷 86-93页

作者：白建明尹晓玲兰州大学管理学院甘肃兰州730000

比较了经典风险模型(即Cramér-Lundberg模型)与现代风险模型,在小额索赔条件下,利用离散嵌入技术、随机游动方法和鞅方法获得了现代风险模型破产概率的指数型上界,并使用MATLAB数值模拟验证了结论的有效性.本文结果可为现实中保险公司... 详细信息

比较了经典风险模型(即Cramér-Lundberg模型)与现代风险模型,在小额索赔条件下,利用离散嵌入技术、随机游动方法和鞅方法获得了现代风险模型破产概率的指数型上界,并使用MATLAB数值模拟验证了结论的有效性.本文结果可为现实中保险公司的风险控制与初始保证金界定提供理论依据.

关键词：现代风险模型破产概率指数上界小额索赔

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协议保护项目中不同利益群体的角色定位研究——基于李子坝协议保护项目的实践探索

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生态经济 2012年第11期28卷 166-170页

作者：李欣白建明兰州大学管理学院甘肃兰州730000

随着经济社会的不断发展和政治体制改革的逐步深化,我国部分地区出现了政府、社区、民间组织等不同利益群体携手共同治理生态环境的新模式——协议保护。为了保障项目的顺利开展与实施,以达到改善生态环境、促进社会和谐发展的目的,不... 详细信息

随着经济社会的不断发展和政治体制改革的逐步深化,我国部分地区出现了政府、社区、民间组织等不同利益群体携手共同治理生态环境的新模式——协议保护。为了保障项目的顺利开展与实施,以达到改善生态环境、促进社会和谐发展的目的,不同利益群体在协议保护中应该扮演好自身角色才能够使整体效能得到最大发挥,并产生部分溢出效能。文章以甘肃省白水江国家级自然保护区李子坝村协议保护试点项目为例,从公共治理的视角出发,探析各个利益群体在协议保护项目中的合理角色定位。

关键词：利益群体协议保护角色定位

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重尾相依随机变量的随机加权和尾概率的渐近估计（英文）

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应用概率统计 2016年第2期32卷 111-120页

作者：唐风琴白建明淮北师范大学数学科学学院淮北235000 兰州大学管理学院兰州730000

令{X_k;k≥1}为一列实值随机变量,{θ_k;k≥1}为另一列与之独立的随机变量序列.假设{X_k;k≥1}为两两广义负象限相依且服从重尾分布,在{θ_k;k≥1}独立和相依条件下,本文得到了一些渐近估计.

关键词：随机加权和两两广义负象限相依重尾分布正相依

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