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Crossover effects of transition metal ions in high-voltage lithium metal batteries

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Nano Research 2023年第6期16卷 8417-8424页

作者： Wanxia Li Yulin Jie yunhua chen Ming Yang Yawei chen Xinpeng Li Youzhang Guo Xianhui Meng Ruiguo Cao Shuhong Jiao Hefei National Laboratory for Physical Science at the Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China NIO Incorporation Shanghai 201800China Science and Technology on Power Sources Laboratory Tianjin Institute of Power SourcesTianjin 300384China

Enhancing the cut-off voltage of high-nickel layered oxide cathodes is an efficient way to obtain higher energy density of lithiummetal batteries(LMBs).However,the phase transition of the cathode materials and the uncontrolled decomposition of the electrolytes at high voltage can lead to irreversible dissolution of transition metal ions,which might cause the crossover effects on the lithium metal ***,the mechanism and electrolyte dependence of the crossover effects for Li metal anodes are still ***,we investigate the crossover effects between LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)and Li-metal anode in two electrolyte *** ether-based electrolyte,its poor oxidation stability results in massive dissolution of transition metal ions,leading to dendrite growth on anode and rapid cells ***,ester-based electrolyte exhibits good electrochemical performances at 4.5 V with little crossover *** study provides an idea for electrolyte systems selection for high-voltage LMBs,and verifies that the crossover effect should not be neglected in LMBs.

关键词： crossover effects lithium-metal batteries high-nickel layered cathodes electrolyte systems dependence transition metals dissolution

Quaternary primary productivity in Porcupine Seabight,NE North Atlantic

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Science China Earth Sciences 2012年第2期55卷 306-314页

作者： LI XiangHui Akihiro KANO chen yunhua Chiduru TAKASHIMA XU WenLi XU BaoLiang WANG RuiJian State Key Laboratory of Enhanced Oil Recovery Institute of Petroleum Exploration&DevelopmentChina National Petroleum CorporationBeijing 100083China Graduate School of Social and Cultural Studies Kyushu University4-2-1 RopponmatsuFukuoka 810-8560Japan School of Earth Sciences and Engineering Nanjing UniversityNanjing 210093China Geological Science Research Institute of Shengli Oilfield SINOPECDongying 257015China Environment Studies Faculty of Culture and EducationSaga University1 Honjo-machiSaga 840-8502Japan Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China Sichuan Research Centre Bureau of Geophysical Prospecting of China National Petroleum CorporationChengdu 610051China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

Biogenic opal and calcium carbonate contents in the Quaternary fine-grained sediments in the deep sea coral mound area (Hole U1317E and Hole U1318B drilled by IODP Expedition 307) in Porcupine Seabight, southwest off Ireland, were measured to estimate the primary productivity (Pp) of the surface seawater in NE Atlantic. The results from the two holes commonly show relatively high Pp values of 10-30 g cm-2 ky-1, having stratigraphic cyclicity reversely correlated with the δ13C profile. The high Pp could be attributed to the oceanic setting controlled by the Eastern North Atlantic (Central) Water and Shelf Edge Current, which have been strongly influenced by the obliquity forcing of the Milankovitch cycle. A positive covariance was observed between high Pp and the mound development in U1317E, implying that the organic matter was the principal food source for the mound coral community. It is proposed that the pelagic marl matrix of the mound sediments provides information of the surface water productivity that is useful for reconstructing the paleoceanography and the paleoclimate in the NW Atlantic.

关键词： primary productivity biogenic opal calcium carbonate Quaternary IODP 307 Porcupine Seabight North Atlantic

Black phosphorus nanosheets-enabled DNA hydrogel integrating 3D-printed scaffold for promoting vascularized bone regeneration

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Bioactive Materials 2023年第3期21卷 97-109页

作者： Yali Miao yunhua chen Jinshui Luo Xiao Liu Qian Yang Xuetao Shi Yingjun Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou510641China National Engineering Research Center for Tissue Restoration and Reconstruction South China University of TechnologyGuangzhou510006China Key Laboratory of Biomedical Engineering of Guangdong Province And Innovation Center for Tissue Restoration and ReconstructionSouth China University of TechnologyGuangzhou510006China Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education South China University of TechnologyGuangzhou510006China

The classical 3D-printed scaffolds have attracted enormous interests in bone regeneration due to the customized structural and mechanical adaptability to bone ***,the pristine scaffolds still suffer from the absence of dynamic and bioactive microenvironment that is analogous to natural extracellular matrix(ECM)to regulate cell behaviour and promote tissue *** address this challenge,we develop a black phosphorus nanosheets-enabled dynamic DNA hydrogel to integrate with 3D-printed scaffold to build a bioactive gel-scaffold construct to achieve enhanced angiogenesis and bone *** black phosphorus nanosheets reinforce the mechanical strength of dynamic self-healable hydrogel and endow the gel-scaffold construct with preserved protein binding to achieve sustainable delivery of growth *** further explore the effects of this activated construct on both human umbilical vein endothelial cells(HUVECs)and mesenchymal stem cells(MSCs)as well as in a critical-sized rat cranial defect *** results confirm that the gel-scaffold construct is able to promote the growth of mature blood vessels as well as induce osteogenesis to promote new bone formation,indicating that the strategy of nano-enabled dynamic hydrogel integrated with 3D-printed scaffold holds great promise for bone tissue engineering.

关键词： DNA hydrogels 3D-printed scaffold Black phosphorus Vascularized bone regeneration

Study of International Coordination of Chinese Monetary Policy under Open Economy

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Chinese Business Review 2003年第4期2卷 13-20页

作者： yunhua chen Beijing Jiaotong University and currently General Manager and Senior Engineer of Ertan Hydropower Development Cooperation

Preliminary study is made to the international coordination of national monetary policy under economic globalization and informationalization. This paper uses Game Theory to analyze the operation effect of Chinese monetary policy. It suggests that the maximum effect of Chinese monetary policy can only be achieved by cooperation and coordination with international society.

关键词： monetary policy international coordination countermeasure

The investigation of pressure drop in moving-beds

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Frontiers of Chemical Science and Engineering 2007年第2期1卷 184-189页

作者： chen yunhua ZHU Xuedong WU Yongqiang ZHU Zibin Institute of Chemical Technology East China University of Science and TechnologyShanghai 200237China

The pressure drop of a cross-flow moving-bed was investigated in a two-dimensional rectangular *** effects of the particle velocity,the superficial gas veloc-ity,the formation and development of cavity/raceway and voidage of particles on the pressure drop were investigated experimentally under the operational conditions of 0.09–1.35 m/s of the superficial gas velocity and 0.95–9.68 cm/min of the particle *** experimental results show that the particle velocity has little influence on the pressure drop,while the phenomena of cavity and pinning occur when the cross-flow velocity is high *** development of a cavity or a raceway can result in three types of variations of pressure drop with time:stabilization,slight fluctuation and severe fluctuation.A cavity appears in a process cycle of‘formation-growing up-collapsing-fluidization’at a high gas *** the basis of experimental results,a model for calculating the pressure drop after a cavity occurs and a dimensionless relationship of cavity size is developed,which gives a good qualitative account of the experimental data.

关键词： cross-flow moving-bed cavity pressure drop

Visualizing phase transition of upper critical solution temperature (UCST) polymers with AIE

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Science China Chemistry 2021年第3期64卷 403-407页

作者： Yong-Guang Jia Kai-Feng chen Meng Gao Sa Liu Jin Wang Xiaohui chen Lin Wang yunhua chen Wenjing Song Huatang Zhang Li Ren Xiao-Xia Zhu Ben Zhong Tang School of Materials Science and Engineering National Engineering Research Center for Tissue Restoration and ReconstructionKey Laboratory of Biomedical Engineering of Guangdong ProvinceKey Laboratory of Biomedical Materials and Engineering of the Ministry of EducationInnovation Center for Tissue Restoration and ReconstructionSouth China University of TechnologyGuangzhou 510641China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China Departement de Chimie Universite de MontrealC.P.6128Succ.Centre-villeMontrealQCH3C 3J7Canada AIE Institute Center for Aggregation-Induced EmissionKey Laboratory of Luminescence from Molecular Aggregates of Guangdong ProvinceState Key Laboratory of Lu minescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionInstitute for Advanced StudyDepartment of Chemical and Biological EngineeringThe Hong Kong University of Science&TechnologyHong KongChina

The stimuli-responsive polymers with upper critical solution temperatures(UCST) are highly attractive for drug delivery applications. However, the phase transition process of UCST polymer is usually characterized by turbidity measurement and electron microscopy, which are significantly restricted by low sensitivity and static observation. In contrary, the fluorescence technique has significant advantages in terms of high sensitivity, easy operation, and dynamic observation. However, the conventional fluorophores suffer from the drawbacks of aggregation-caused quenching(ACQ) after being encapsulated by UCST polymers, which are not suitable for direct visualization of the phase transition process. To tackle this challenge, we herein developed a series of UCST polymers based on polyacrylamides decorated with bile acid and aggregation-induced emission(AIE)-active tetraphenylethene(TPE) groups, which can be used for direct fluorescence monitoring of the phase transition process. Moreover, the AIE-active UCST polymers can serve as drug carriers, which can not only monitor the drug release process under thermal stimuli, but also verify the drug release by fluorescence recovery after thermal stimuli. It is expected that the AIE-active UCST polymers with self-monitoring ability are promising for biomedical applications.

关键词： upper critical solution temperatures aggregation-induced emission phase transition process drug release monitoring bile acid

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雅砻江流域近期水电项目开发输电规划研究

水力发电学报 2007年第1期26卷 16-19,47页

作者：陈云华北京交通大学

雅砻江是金沙江的最大支流,水力资源十分丰富。雅砻江干流开发方案共拟定21个梯级,总装机容量约3000万kW。根据国家电网交直流特高压骨干网架规划,本文主要研究两河口、锦屏一级、二级、官地、桐子林梯级电站的输电方案。研究认为:锦屏... 详细信息

雅砻江是金沙江的最大支流,水力资源十分丰富。雅砻江干流开发方案共拟定21个梯级,总装机容量约3000万kW。根据国家电网交直流特高压骨干网架规划,本文主要研究两河口、锦屏一级、二级、官地、桐子林梯级电站的输电方案。研究认为:锦屏一级、锦屏二级和官地二个电站大部分电力规划外送至华东和重庆地区,少部分供应四川电网;桐子林、两河口电站,将在满足四川电网负荷需求的前提下,与其它电站协调参与川电外送。雅砻江流域梯级水电开发在我国西电东送和全国能源资源优化配置中将发挥重要的作用。

关键词：水电站西电东送水电开发电网雅砻江

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基于综合指标法的发电企业市场竞争力分析

水力发电学报 2006年第5期25卷 14-16,57页

作者：陈云华北京交通大学

为准确地评估发电企业市场竞争力,以便发电企业制定合理的竞价策略,本文采用模糊综合评判法,以可用容量、上网电价、储存能力、多年平均年发电量等作为指标,建立发电企业市场竞争力的综合评价体系。该体系将影响发电企业竞争力大小的指... 详细信息

为准确地评估发电企业市场竞争力,以便发电企业制定合理的竞价策略,本文采用模糊综合评判法,以可用容量、上网电价、储存能力、多年平均年发电量等作为指标,建立发电企业市场竞争力的综合评价体系。该体系将影响发电企业竞争力大小的指标综合考虑,将多指标统一量化为单一指标,具有较强的综合性;算例表明,该方法指标数据易于获得,实用性强,可用于分析评价发电企业的市场竞争力。

关键词：市场力竞价策略综合指标法模糊综合评判法

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雅砻江锦屏大河湾水生生态环境保护研究

水力发电 2012年第10期38卷 5-7,56页

作者：陈云华二滩水电开发有限责任公司四川成都610051

河流水电开发将不可避免地改变原河流的水文情势,对河流水生生态系统造成一定影响。在雅砻江锦屏大河湾水电开发中,二滩水电开发有限责任公司开创性地研究采用了分层取水、生态流量泄放、建设鱼类增殖站、设置人工鱼巢、建立鱼类种质资... 详细信息

河流水电开发将不可避免地改变原河流的水文情势,对河流水生生态系统造成一定影响。在雅砻江锦屏大河湾水电开发中,二滩水电开发有限责任公司开创性地研究采用了分层取水、生态流量泄放、建设鱼类增殖站、设置人工鱼巢、建立鱼类种质资源库等一系列水生生态综合保护措施,利用锦屏大河湾营造适生水生生态环境条件,维持鱼类种群多样性。采取的综合措施对解决河流水电开发的水生生态影响问题具有重要意义和参考价值。

关键词：生态环境保护水电工程分层取水生态流量鱼类增殖锦屏雅砻江