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Progress in electrolytes for beyond-lithium-ion batteries

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Journal of Materials Science & Technology 2020年第9期44卷 237-257页

作者： Juyan Zhang Xuhui Yao Ravi KMisra qiong cai Yunlong Zhao Faculty of Engineering and Physical Sciences Department of Chemical and Process EngineeringUniversity of SurreyGuildfordGU27XHUK Advanced Technology Institute University of SurreyGuildfordGU27XHUK National Physical Laboratory TeddingtonMiddlesexTW110LWUK

The constant increase in global energy demand and stricter environmental standards are calling for advanced energy storage technologies that can store electricity from intermittent renewable sources such as wind,solar,and tidal power,to allow the broader implementation of the *** gridoriented sodium-ion batteries,potassium ion batteries and multivalent ion batteries are cheaper and more sustainable alternatives to Li-ion,although they are still in the early stages of *** optimisation of these battery systems is required,to improve the energy and power density,and to solve the safety issues caused by dendrites growth in ***,one of the most critical components in these batteries,could significantly influence the electrochemical performances and operations of *** this review,the definitions and influences of three critical components(salts,solvents,and additives)in electrolytes are *** significant advantages,challenges,recent progress and future optimisation directions of various electrolytes for monovalent and multivalent ions batteries(***,ionic liquid and aqueous liquid electrolytes,polymer and inorganic solid electrolytes)are summarised to guide the practical application for grid-oriented batteries.

关键词： Electrolytes Organic liquid electrolyte Aqueous electrolyte Ionic liquid electrolyte Solid-state electrolyte Sodium-ion batteries Potassium ion batteries Multivalent ion batteries

Synthesis of Bi2S3/carbon nanocomposites as anode materials for lithium-ion batteries

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Journal of Materials Science & Technology 2020年第15期47卷 92-102页

作者： Jin Bai Xiao Chen Emilia Olsson Huimin Wu Shiquan Wang qiong cai Chuanqi Feng Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Synthesis and Applications of Organic Functional Molecules Hubei UniversityWuhan430062China Department of Chemical and Process Engineering University of SurreyGuildfordGU27XHUK

Metal sulfides such as Bismuth sulfide(Bi2 S3) hold immense potential to be promoted as anode materials for lithium-ion batteries(LIBs),owing to their high theoretical gravimetric and volumetric ***,the poor electrical conductivity and volume expansion during cycling hinder the practical applications of Bi2 *** this work,we used pyrrole and glucose as carbon source to design the surface carbon coating on the surface of Bi2 S3 particles,to improve the structural stability of Bi2 *** composite materials were synthesized-Bi2 S3 coated with nitrogen doped carbon(Bi2 S3@NC),and Bi2 S3 coated with carbon(Bi2 S3@C).When used as anode active materials,both Bi2 S3@NC and Bi2 S3@C showed improved performance compared to Bi2 S3,which confirms surface carbon coating as an effective and scalable way for the modification of Bi2 S3 *** electrode based on Bi2 S3@NC materials demonstrated higher performance than that of Bi2 S3@C,with an initial discha rge capacity of 1126.5 mA h/g,good cycling stability(500 mA h/g after 200 cycles at 200 mA/g) and excellent rate ***,Li storage and migration mechanisms in Bi2 S3 are revealed using first principle density functional theory calculations.

关键词： Metal sulfides Anode material Lithium-ion battery Electrochemical properties Density functional theory

Life forms affect beta-diversity patterns of larch forests in China

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Plant Diversity 2024年第1期46卷 49-58页

作者： Wenjing Fang qiong cai Chengjun Ji Jiangling Zhu Zhiyao Tang Jingyun Fang School of Ecology and Environmental Science Yunnan UniversityKunming 650091China Department of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China

Beta-diversity reflects the spatial changes in community species composition which helps to understand how communities are assembled and biodiversity is formed and maintained. Larch(Larix) forests, which are coniferous forests widely distributed in the mountainous and plateau areas in North and Southwest China, are critical for maintaining the environmental conditions and species diversity. Few studies of larch forests have examined the beta-diversity and its constituent components(species turnover and nestedness-resultant components). Here, we used 483 larch forest plots to determine the total betadiversity and its components in different life forms(i.e., tree, shrub, and herb) of larch forests in China and to evaluate the main drivers that underlie this beta-diversity. We found that total betadiversity of larch forests was mainly dependent on the species turnover component. In all life forms,total beta-diversity and the species turnover component increased with increasing geographic, elevational, current climatic, and paleoclimatic distances. In contrast, the nestedness-resultant component decreased across these same distances. Geographic and environmental factors explained 20%-25% of total beta-diversity, 18%-27% of species turnover component, and 4%-16% of nestedness-resultant component. Larch forest types significantly affected total beta-diversity and species turnover component. Taken together, our results indicate that life forms affect beta-diversity patterns of larch forests in China, and that beta-diversity is driven by both niche differentiation and dispersal limitation. Our findings help to greatly understand the mechanisms of community assemblies of larch forests in China.

关键词： Beta-diversity Species turnover Nestedness-resultant Geographic distance Climatic distance Larch forest

Amorphous phosphorus chalcogenide as an anode material for lithiumion batteries with high capacity and long cycle life

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Journal of Energy Chemistry 2022年第5期31卷 658-668页

作者： Jiale Yu Haiyan Zhang Yingxi Lin Junyao Shen Yiwen Xie Xifeng Huang qiong cai Haitao Huang School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongChina Department of Chemical and Process Engineering University of SurreyGuildford GU27XHUK Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China

The ever-increasing demands for modern energy storage applications drive the search for novel anode materials of lithium(Li)-ion batteries(LIBs) with high storage capacity and long cycle life, to outperform the conventional LIBs anode materials. Hence, we report amorphous ternary phosphorus chalcogenide(aP_(4)SSe_(2)) as an anode material with high performance for LIBs. Synthesized via the mechanochemistry method, the a-P_(4)SSe_(2) compound is endowed with amorphous feature and offers excellent cycling stability(over 1500 mA h g^(-1) capacity after 425 cycles at 0.3 A g^(-1)), owing to the advantages of isotropic nature and synergistic effect of multielement forming Li-ion conductors during battery operation. Furthermore,as confirmed by ex situ X-ray diffraction(XRD) and transmission electron microscope(TEM), the a-P_(4)SSe_(2)anode material has a reversible and multistage Li-storage mechanism, which is extremely beneficial to long cycle life for batteries. Moreover, the autogenous intermediate electrochemical products with fast ionic conductivity can facilitate Li-ion diffusion effectively. Thus, the a-P_(4)SSe_(2)electrode delivers excellent rate capability(730 mA h g^(-1)capacity at 3 A g^(-1)). Through in situ electrochemical impedance spectra(EIS) measurements, it can be revealed that the resistances of charge transfer(R_(SEI)) and solid electrolyte interphase(R_(Ct)) decrease along with the formation of Li-ion conductors whilst the ohmic resistance(R_(Ω)) remains unchanged during the whole electrochemical process, thus resulting in rapid reaction kinetics and stable electrode to obtain excellent rate performance and cycling ability for LIBs. Moreover, the formation mechanism and electrochemical superiority of the a-P_(4)SSe_(2)phase, and its expansion to P_(4)S_(3-x)Se_(x)(x = 0, 1, 2, 3) family can prove its significance for LIBs.

关键词： Lithium-ion batteries Amorphous anode materials Lithium ionic conductor High capacity Long cycle life

Conducting Polymers Meet Lithium-Sulfur Batteries:Progress,Challenges,and Perspectives

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Energy & Environmental Materials 2023年第5期6卷 159-182页

作者： Xin Chen Chengcheng Zhao Kai Yang Shiyi Sun Jinxin Bi Ningrui Zhu qiong cai Jianan Wang Wei Yan Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049China Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery Department of Environmental EngineeringXi'an Jiaotong UniversityXi'an 710049China Advanced Technology Institute University of SurreyGuildfordSurrey GU27XHUK College of Arts College of Landscape Architecture Fujian Agriculture and Forestry UniversityFuzhou 350108China Department of Chemical&Process Engineering Faculty of Engineering and Physical Sciences University of SurreyGuildford GU27XHUK

Lithium-sulfur(Li-S)batteries have attracted increased interest because of the high theoretical energy density,low cost,and environmental *** polymers(CPs),as one of the most promising materials used in Li-S batteries,can not only facilitate electron transfer and buffer the large volumetric change of sulfur benefiting from their porous structure and excellent flexibility,but also enable stronger physical/chemical adsorption capacity toward polysulfides(LiPSs)when doped with abundant heteroatoms to promote the sulfur redox kinetics and achieve the high sulfur *** review firstly introduces the properties of various CPs including structural CPs(polypyrrole(PPy),polyaniline(PANi),polyethylene dioxothiophene[PEDOT])and compound CPs(polyethylene oxide(PEO),polyvinyl alcohol(PVA)and poly(acrylic acid)[PAA]),and their application potential in Li-S ***,the research progress of various CPs in different components(cathode,separator,and interlayer)of Li-S batteries is systematically ***,the application perspective of the CPs in Li-S batteries as a potential guidance is comprehensively discussed.

关键词： conducting polymers Li-S batteries modified materials polysulfides

Nursing model of midwifery and postural and psychological interventions:Impact on maternal and fetal outcomes and negative emotions of primiparas

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World Journal of Psychiatry 2023年第8期13卷 543-550页

作者： Ping Gao cai-qiong Guo Ma-Yu Chen Hui-Ping Zhuang Department of Obstetrics and Gynecology Quanzhou Maternity and Child Healthcare HospitalQuanzhou 362017Fujian ProvinceChina School of Nursing Fujian Medical UniversityQuanzhou 350108Fujian ProvinceChina Department of Obstetrics and Gynecology The 910th Hospital of the People's Liberation Army Joint Logistic Support ForceQuanzhou 362008Fujian ProvinceChina

BACKGROUND Primiparas are usually at high risk of experiencing perinatal depression,which may cause prolonged labor,increased blood loss,and intensified pain,affecting maternal and fetal ***,interventions are necessary to improve maternal and fetal outcomes and alleviate primiparas’negative emotions(NEs).AIM To discusses the impact of nursing responsibility in midwifery and postural and psychological interventions on maternal and fetal outcomes as well as primiparas’*** As participants,115 primiparas admitted to Quanzhou Maternity and Child Healthcare Hospital between May 2020 and May 2022 were *** them,56 primiparas(control group,Con)were subjected to conventional midwifery and routine *** remaining 59(research group,Res)were subjected to the nursing model of midwifery and postural and psychological *** groups were comparatively analyzed from the perspectives of delivery mode(cesarean,natural,or forceps-assisted),maternal and fetal outcomes(uterine inertia,postpartum hemorrhage,placental abruption,neonatal pulmonary injury,and neonatal asphyxia),NEs(Hamilton Anxiety/Depressionrating Scale,HAMA/HAMD),labor duration,and nursing *** The Res exhibited a markedly higher natural delivery rate and nursing satisfaction than the ***,the Res indicated a lower incidence of adverse events(e.g.,uterine inertia,postpartum hemorrhage,placental abruption,neonatal lung injury,and neonatal asphyxia)and shortened duration of various stages of *** also showed statistically lower post-interventional HAMA and HAMD scores than the Con and pre-interventional *** The nursing model of midwifery and postural and psychological interventions increase the natural delivery rate and reduce the duration of each labor *** are also conducive to improving maternal and fetal outcomes and mitigating primiparas’NEs and thus deserve popularity in clinical practice.

关键词： Nursing model of midwifery Postural intervention Primipara Maternal and fetal outcomes Negative emotions

The structural characteristics and climatic and human impacts of deciduous oak forests in China

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Journal of Plant Ecology 2022年第2期15卷 265-276页

作者： Guoping Chen qiong cai Wenjing Fang Yuhao Feng Jiangling Zhu Chengjun Ji Zhiyao Tang Jingyun Fang Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China

Deciduous oak forest is one of the typical vegetation types in temperate and subtropical mountain zones in ***,the patterns and determinants of the structural characteristics of these forests remain poorly *** investigated 682 oak forest plots across China to characterize the community structures of the oak forests and analyze the underlying factors controlling their spatial *** all plots,the overall mean values were 13.7 cm,10.0 m,1468 stems/ha and 24.3 m^(2)/ha for the diameter at breast height(DBH),height,stem density and total basal area(TBA)of trees,*** average species richness was 6 species/600 m^(2),10 species/100 m^(2) and 4 species/1 m^(2) for the tree,shrub and herb layers,*** latitude increased,the mean tree height,stem density,TBA,tree species richness and shrub species richness decreased,and the mean DBH did not show a significant trend,while species richness of herbs increased *** and anthropogenic variables could explain more variations in mean DBH,mean tree height,TBA,tree species richness,shrub species richness than those in stem density and herb species *** analysis showed that precipitation-related climatic factors were major factors shaping the spatial patterns of community *** findings provide a basis for recognizing the biogeographic patterns of oak forest structures and their responses to global change in China.

关键词： Quercus deciduous oak forests structural characteristics climate human disturbance China

Towards Practical Application of Li-S Battery with High Sulfur Loading and Lean Electrolyte:Will Carbon-Based Hosts Win This Race?

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Nano-Micro Letters 2023年第9期15卷 384-422页

作者： Yi Gong Jing Li Kai Yang Shaoyin Li Ming Xu Guangpeng Zhang Yan Shi qiong cai Huanxin Li Yunlong Zhao Advanced Technology Institute University of SurreyGuildfordSurrey GU27XHUK Department of Chemical and Process Engineering University of SurreyGuildford GU27XHUK Department of Chemistry Physical and Theoretical Chemistry LaboratoryUniversity of OxfordOxford OX13QZUK Department of Engineering University of Cambridge9 JJ Thomson AvenueCambridge CB30FAUK State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanPeople’s Republic of China College of Materials and Metallurgy Guizhou UniversityGuiyang 550025People’s Republic of China

As the need for high-energy–density batteries continues to grow, lithium-sulfur(Li–S) batteries have become a highly promising next-generation energy solution due to their low cost and exceptional energy density compared to commercially available Li-ion batteries. Research into carbon-based sulfur hosts for Li–S batteries has been ongoing for over two decades, leading to a significant number of publications and ***, the commercialization of Li–S batteries has yet to be realized. This can be attributed, in part, to the instability of the Li metal anode. However, even when considering just the cathode side, there is still no consensus on whether carbon-based hosts will prove to be the best sulfur hosts for the industrialization of Li–S batteries. Recently, there has been controversy surrounding the use of carbon-based materials as the ideal sulfur hosts for practical applications of Li–S batteries under high sulfur loading and lean electrolyte conditions. To address this question, it is important to review the results of research into carbon-based hosts, assess their strengths and weaknesses, and provide a clear perspective. This review systematically evaluates the merits and mechanisms of various strategies for developing carbon-based host materials for high sulfur loading and lean electrolyte conditions. The review covers structural design and functional optimization strategies in detail, providing a comprehensive understanding of the development of sulfur hosts. The review also describes the use of efficient machine learning methods for investigating Li–S batteries. Finally, the outlook section lists and discusses current trends, challenges, and uncertainties surrounding carbon-based hosts, and concludes by presenting our standpoint and perspective on the subject.

关键词： Li-S batteries Carbon materials Structural design Functional modification Machine learning

Adaptive compression method for underwater images based on perceived quality estimation

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Frontiers of Information Technology & Electronic Engineering 2019年第5期20卷 716-730页

作者： Ya-qiong cai Hai-xia ZOU Fei YUAN Key Laboratory of Underwater Acoustic Communication and Marine Information Technology Ministry of Education Xiamen University Xiamen 361005 China

Underwater image compression is an important and essential part of an underwater image transmission system. An assessment and prediction method of effectively compressed image quality can assist the system in adjusting its compression ratio during the image compression process, thereby improving the efficiency of the image transmission system. This study first estimates the perceived quality of underwater image compression based on embedded coding compression and compressive sensing, then builds a model based on the mapping between image activity measurement(IAM) and bits per pixel and structural similarity(BPP-SSIM) curves, next obtains model parameters by linear fitting, and finally predicts the perceived quality of the image compression method based on IAM, compression ratio, and compression strategy. Experimental results show that the model can effectively fit the quality curve of underwater image compression. According to the rules of parameters in this model, the perceived quality of underwater compressed images can be estimated within a small error range. The presented method can effectively estimate the perceived quality of underwater compressed images, balance the relationship between the compression ratio and compression quality, reduce the pressure on the data cache, and thus improve the efficiency of the underwater image communication system.

关键词： Underwater image compression Set partitioning in hierarchical trees Compressive sensing Compression quality estimation