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Alleviating the anisotropic microstructural change and boosting the lithium ions diffusion by grain orientation regulation for Ni-rich cathode materials

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Journal of energy Chemistry 2024年第1期88卷 213-222,I0005页

作者： Xinyou He Shilin Su Bao Zhang Zhiming Xiao Zibo Zhang Xing Ou Engineering Research Center of the Ministry of Education for Advanced Battery Materials School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina Zhejiang Power new energy co.Ltd Zhuji 311899ZhejiangChina

Generally,layered Ni-rich cathode materials exhibit the morphology of polycrystalline seco.dary sphere co.posed of numerous primary *** the arrangement of primary particles plays a very important role in the properties of Ni-rich *** disordered particle arrangement is harmful to the cyclic performance and structural stability,yet the fundamental understanding of disordered structure on the structural degradation behavior is ***,we have designed three kinds of LiNi_(0.83)co.(0.06)Mn_(0.11)O_(2) cathode materials with different primary particle orientations by regulating the precursor co.recipitation *** finite element simulation and in-situ characterization,the Li^(+)transport and structure evolution behaviors of different materials are ***,the smooth Li^(+)diffusion minimizes the reaction heterogeneity,homogenizes the phase transition within grains,and mitigates the anisotropic microstructural change,thereby modulating the crack evolution ***,the optimized structure evolution ensures radial tight junctions of the primary particles,enabling enhanced Li^(+)diffusion during dynamic ***-loop bidirectional enhancement mechanism beco.es critical for grain orientation regulation to stabilize the cyclic *** precursor engineering with particle orientation regulation provides the useful guidance for the structural design and feature enhancement of Ni-rich layered cathodes.

关键词： Ni-rich cathode Grain orientation regulation Anisotropic microstructural change Precursor engineering Li~+-ions diffusion

Emerging low-density polyethylene/paraffin wax/aluminum co.posite as a form-stable phase change thermal interface material

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 772-781页

作者： Chuanchang Li Weixuan Wang Xiaoliang Zeng Chunxuan Liu Rong Sun School of energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China hunan Xiangtou Light Material Technology co. Ltd.Changsha 410012China

Thermal interface materials(TIMs) play a vital role in the thermal management of electronic devices and can significantly reduce thermal co.tact resistance(TCR). The TCR between the solid–liquid co.tact surface is much smaller than that of the solid–solid co.tact surface, but co.ventional solid–liquid phase change materials are likely to cause serious leakage. Therefore, this work has prepared a new formstable phase change thermal interface material. Through the melt blending of paraffin wax(PW) and low-density polyethylene(LDPE), the stability is improved and it has an excellent co.ting effect on PW. The addition of aluminum(Al) powder improves the low thermal co.ductivity of PW/LDPE, and the addition of 15wt% Al powder improves the thermal co.ductivity of the internal structure of the matrix by 67%. In addition, the influence of the addition of Al powder on the internal structure, thermal properties, and phase change behavior of the PW/LDPE matrix was systematically studied. The results co.firmed that the addition of Al powder improved the thermal co.ductivity of the material without a significant impact on other properties, and the thermal co.ductivity increased with the increase of Al addition. Therefore, morphologically stable PW/LDPE/Al is an important development direction for TIMs.

关键词： paraffin wax low-density polyethylene phase change materials thermal interface materials form stability

Preparation of low co.alt-doped LiNiO2 materials by the spray pyrolysis method

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Progress in Natural Science:Materials International 2023年第4期33卷 425-432页

作者： Bianzheng You Zhixing Wang Ding Wang Gui Luo Duo Deng Guochun Yan Huajun Guo Xinhai Li Wenjie Peng Mingxia Dong Jiexi Wang National Key Laboratory of energy Metal Resources and new Materials Engineering Research Center of the Ministry of Education for Advanced Battery Materials Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy School of Metallurgy and Environment Central South University National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Research Institute BASF Shanshan Battery Materials Co LTD.

LiNiO2(LNO) is reco.nized as the most promising cathode material for next-generation lithium-ion batteries owing to its highest energy density and eco.omic benefit in the layered oxide cathode materials ***, severe cation disordering, multiple phase transformations and poor lithium-ion diffusion kinetics,which result in rapid degradation of cycling stabilities and rate properties, hinder its further practical applications. co.alt doping is an effective strategy to address such issues, but the influences of co.alt on LNO materials have not been figured out co.pletely yet. Hence, a systematical investigation of co.alt doping for LiNiO2cathode materials prepared by spray pyrolysis is co.ducted. The addition of co.alt enhances the stabilities of layered structures and suppresses the cation disordering effectively. The multiple-phase transformations during cycling are also alleviated significantly. Furthermore, co.alt doping can decrease charge transfer resistances and improve lithium-ion diffusion kinetics, especially at high de-lithiation states. As a result, the electrochemical performances are improved co.prehensively after co.alt doping. The LNO with optimal doping amount exhibits an improved capacity retention of 78.0% after 100 cycles as co.pared with 64.9% for pristine LNO, and an outstanding rate performance of 167.2 mA h g-1with the current density of 5 C(1 C = 200 mA g-1).

关键词： Lithium nickel oxides Spray pyrolysis co.alt doping Phase transformations Lithium-ion diffusion kinetics

Beginning of a new Revolution of Science ＆ Technology

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Journal of Physical Science and Application 2014年第4期4卷 269-275页

作者： Jinzhong Yan Changsha Jiageer Machinary Manufacture co. Ltd Pingtang Town 410208 Changsha City Hunan Province China

Modern science and technology is being developed towards destroying human and human calls for a new era of science ＆ technology. co.temporary science is seeing a significant breakthrough and a new revolution of science and technology is beginning. The theoretical basis of the new revolution of science and technology is ＂state space-time＂, ＂the unity of physics and biology＂, ＂thinking motion and automatic organization of the universe＂ and ＂thinking＇s active co.trol＂. The new revolution of science and technology takes material （microsco.ic particle） science, life （organic and inorganic life） science and thinking science as the fundamental sciences, takes life technology, new information technology, new material technology and new energy technology as the basis of the overall technological system, progresses in all aspects, including life technology, medicine, new material technology, new information technology, new energy technology, new robot technology, new manufacturing technology, laser technology, astronavigation technology, ocean technology, military technology, new educational technology, etc., and at the same time Qigong technology with thinking co.trol as its co.e will emerge. In the era of life, thinking and Qigong technology, technology proceeds very rapidly, global society and eco.omy develop at a high speed, and globalization is accelerated. Life, thinking and Qigong technologies feature improvement of human internal energy and quality, purify human soul, reduce material desire, and greatly reduce environmental disruption. The overall （thinking and Qigong） technology takes the establishment of the co.mic era of human as its ultimate goal.

关键词： new revolution of science and technology life technology thinking technology Qigong technology beginning.

Sustainable silico. anodes facilitated via a double-layer interface engineering: Inner SiOx co.bined with outer nitrogen and boron co.doped carbon

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Carbon energy 2022年第3期4卷 399-410页

作者： Jun Zhou Yao Lu Lishan Yang Wenqiang Zhu Weifang Liu Yahui Yang Kaiyu Liu Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research(Ministry of Education) National and Local Joint Engineering Laboratory for New Petrochemical Materials and Fine Utilization of ResourcesKey Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan ProvinceHunan Normal UniversityChangshaHunanP.R.China co.lege of Chemistry and Chemical Engineering Central South UniversityChangshaHunanP.R.China

Silico.-based(Si)materials are promising anodes for lithium-ion batteries(LIBs)because of their ultrahigh theoretical capacity of 4200 mA h g^(−1).However,co.mercial applications of Si anodes have been hindered by their drastic volume variation(∼300%)and low electrical ***,to tackle the drawbacks,a hierarchical Si anode with double-layer co.tings of a SiOx inner layer and a nitrogen(N),boron(B)co.doped carbon(C-NB)outer layer is elaborately designed by co.yrolysis of Si-OH structures and a H3BO_(3)-doped polyaniline polymer on the Si *** with the pristine Si anodes(7mA h g^(−1) at 0.5 A g^(−1) after 340 cycles and 340 mA h g^(−1) at 5 A g^(−1)),the modified Si-based materials(Si@SiOx@C-NB nanospheres)present su perior cycling stability(reversible 1301 mA h g^(−1) at 0.5 A g^(−1) after 340 cycles)as well as excellent rate capability(690mA h g^(−1) at 5 A g^(−1))when used as anodes in *** unique double-layer co.ting structure,in which the inner amorphous SiOx layer acts as a buffer matrix and the outer defect-rich carbon enhances the electron diffusion of the whole anode,makes it possible to de liver excellent electrochemical *** results indicate that our double-layer co.ting strategy is a promising approach not only for the devel opment of sustainable Si anodes but also for the design of multielement-doped carbon nanomaterials.

关键词： boron-nitrogen co.doped carbon co.ting silico. anode stability wettability

Realizing the highly reversible Zn^(2+)and Na^(+) dual ions storage in high-crystallinity nickel hexacyanoferrate microcubes for aqueous zinc-ion batteries

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Journal of Materials Science & Technology 2023年第33期164卷 102-110页

作者： Kexuan Wang Zhu Xu Heng Li Huibo Wang Mingzheng Ge Jilei Liu Shengwen Li Zekun Hu Mengyu Zhu Yanyan Zhang Yuxin Tang Shi Chen Institute of Applied Physics and Materials Engineering University of MacaoMacao SAR 999078China State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China co.lege of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology of Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha 410082China co.lege of Chemical Engineering Fuzhou UniversityFuzhou 350116China

Prussian blue analogues(PBAs)with the 3D open framework are regarded as promising cathode candidates for aqueous Zinc ion batteries(ZIBs).Among various PBAs,nickel hexacyanoferrate(NiHCF)has attracted co.siderable attention because of its high operating voltage and eco.omic ***,the cyclability of NiHCF is unsatisfactory due to poor structural stability during Zn^(2+) ions insertion/***,the ion storage mechanism of NiHCF in aqueous electrolytes has not been fully revealed ***,high-crystallinity NiHCF(HC-NiHCF)microcubes with improved structural stability and larger crystal plane spacing are *** the first time,highly reversible Zn2+ions and Na+ions co.insertion/extraction are achieved for the HC-NiHCF microcubes in mixed aqueous electrolyte,as evidenced by various observations including two separated discharge plateaus and sequential changes of Na 1s and Zn 2p signals in ex-situ X-ray photoelectron spectrosco.y(XPS).As a result,a high specific capacity of 73.9 mAh g^(−1) is obtained for the HC-NiHCF microcubes at 0.1 A g−1,co.bined with enhanced cycle stability(75%vs.16.4%)over 1000 cycles at 2 A g^(−1).The reversible Zn^(2+) ions and Na+ions co.insertion in HC-NiHCF microcubes reveals a new ion storage mechanism of Ni-based PBAs in aqueous electrolytes.

关键词： Aqueous zinc-ion batteries Prussian blue analogues Ion storage mechanism Dual ions storage High crystallinity

Layered oxide cathodes for sodium-ion batteries: From air stability, interface chemistry to phase transition

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InfoMat 2023年第6期5卷 1-43页

作者： Yi-Feng Liu Kai Han Dan-Ni Peng Ling-Yi Kong Yu Su Hong-Wei Li Hai-Yan Hu Jia-Yang Li Hong-Rui Wang Zhi-Qiang Fu Qiang Ma Yan-Fang Zhu Rui-Ren Tang Shu-Lei Chou Yao Xiao Xiong-Wei Wu co.lege of Chemistry and Chemical Engineering Central South UniversityChangshathe People's Republic of China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouthe People's Republic of China co.lege of Agronomy School of Chemistry and Materials ScienceHunan Agricultural UniversityChangshathe People's Republic of China Wenzhou Key Laboratory of Sodium-Ion Batteries Wenzhou University Technology Innovation Institute for Carbon NeutralizationWenzhouthe People's Republic of China co.lege of Electrical and Information Engineering Hunan UniversityChangshathe People's Republic of China hunan province Yin Feng new energy co.Ltd Changshathe People's Republic of China

Sodium-ion batteries(SIBs)are co.sidered as a low-co.t co.plementary or alternative system to prestigious lithium-ion batteries(LIBs)because of their similar working principle to LIBs,co.t-effectiveness,and sustainable availability of sodium resources,especially in large-scale energy storage systems(EESs).Among various cathode candidates for SIBs,Na-based layered transition metal oxides have received extensive attention for their relatively large specific capacity,high operating potential,facile synthesis,and environmental ***,there are a series of fatal issues in terms of poor air stability,unstable cathode/electrolyte interphase,and irreversible phase transition that lead to unsatisfactory battery performance from the perspective of preparation to application,outside to inside of layered oxide cathodes,which severely limit their practical *** work is meant to review these critical problems associated with layered oxide cathodes to understand their fundamental roots and degradation mechanisms,and to provide a co.prehensive summary of mainstream modification strategies including chemical substitution,surface modification,structure modulation,and so forth,co.centrating on how to improve air stability,reduce interfacial side reaction,and suppress phase transition for realizing high structural reversibility,fast Na+kinetics,and superior co.prehensive electrochemical *** advantages and disadvantages of different strategies are discussed,and insights into future challenges and opportunities for layered oxide cathodes are also presented.

关键词： air stability interface chemistry layered oxide cathodes phase transition sodium-ion batteries

Machine learning predicting and engineering the yield,N co.tent,and specific surface area of biochar derived from pyrolysis of biomass

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Biochar 2022年第1期4卷 134-151页

作者： Lijian Leng Lihong Yang Xinni Lei Weijin Zhang Zejian Ai Zequn Yang Hao Zhan Jianping Yang Xingzhong Yuan Haoyi Peng Hailong Li School of energy Science and Engineering Central South UniversityChangsha 410083HunanPeople’s Republic of China. co.lege of Environmental Science and Engineering Hunan UniversityChangsha 410083HunanPeople’s Republic of China

Biochar produced from pyrolysis of biomass has been developed as a platform carbonaceous material that can be used in various *** specific surface area(SSA)and functionalities such as N-co.taining functional groups of biochar are the most significant properties determining the application performance of biochar as a carbon material in various areas,such as removal of pollutants,adsorption of co.(2)and H2,catalysis,and energy *** biochar with preferable SSA and N functional groups is among the frontiers to engineer biochar *** study attempted to build machine learning models to predict and optimize specific surface area of biochar(SSA-char),N co.tent of biochar(N-char),and yield of biochar(Yield-char)individually or simultaneously,by using elemental,proximate,and biochemical co.positions of biomass and pyrolysis co.ditions as input *** predictions of Yield-char,N-char,and SSA-char were co.pared by using random forest(RF)and gradient boosting regression(GBR)*** outperformed RF for most *** input parameters included elemental and proximate co.positions as well as pyrolysis co.ditions,the test R^(2) values for the single-target and multi-target GBR models were 0.90-0.95 except for the two-target prediction of Yield-char and SSA-char which had a test R^(2) of 0.84 and the three-target prediction model which had a test R^(2) of *** indicated by the Pearson co.relation co.fficient between variables and the feature importance of these GBR models,the top influencing factors toward predicting three targets were specified as follows:pyrolysis temperature,residence time,and fixed carbon for Yield-char;N and ash for N-char;ash and pyrolysis temperature for *** effects of these parameters on three targets were different,but the trade-offs of these three were balanced during multi-target ML prediction and *** optimum solutions were then experimentally verified,which opens a new way for de

关键词： Specific surface area Nitrogen Biochar Pyrolysis Machine learning

Ultrathin organic polymer with p-πco.jugated structure for simultaneous photocatalytic disulfide bond generation and co.(2)reduction

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Journal of energy Chemistry 2023年第1期76卷 639-647,I0016页

作者： Linquan Hou Zhunyun Tang Guojiang Mao Shiheng Yin Bei Long Tao Ouyang Guo-Jun Deng Atif Ali Ting Song Key Laboratory for Green Organic Synthesis and Application of hunan province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtan 411105HunanChina hunan Key Laboratory for Micro-Nano energy Materials and Device School of Physics and OptoelectronicsXiangtan UniversityXiangtan 411105HunanChina School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007HenanChina Analytical and Testing Center South China University of TechnologyGuangzhou 510640GuangdongChina Department of Chemistry and State Key Laboratory of Synthetic Chemistry The University of Hong KongPokfulam RoadHong Kong 999077China

co.bining photocatalytic organic reactions with co.(2)reduction is an efficient solar energy utilization mode,but it is still limited by the organic species that can be matched and the low ***,ultrathin organic polymer with p-πco.jugated structure(TPP)was rationally designed and prepared,and showed a high yield of co.15.2 mmol g^(-1))and co.version of SAS co.pled products(100%),far exceeding the organic polymer with P=O *** enhanced photoredox activity of TPP is ascribed to the orbital interaction between the p-orbital on phosphorus and theπ-orbitals of aromatic,which can accelerate the photoinduced charge carrier separation and improve the co.(2)adsorption *** can also be used for the dehydroco.pling of various benzyl mercaptans to the co.responding SAS bond *** work provides a new co.cept for the efficient synthesis of disulfide bonds co.bined with co.(2)reduction in a photoreaction system.

关键词： Photocatalytic co.pled reaction Disulfide bond co.(2)reduction High activity Organic polymer