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research Progress in Improving the rate Performance of LiFePO_4 Cathode Materials

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Nano-Micro Letters 2014年第3期6卷 209-226页

作者： Sixu deng Hao Wang Hao Liu Jingbing Liu Hui Yan The College of Materials Science and Engineering Beijing University of Technology chengdu green energy and green manufacturing technology r&d centre

Olivine lithium iron phosphate(Li Fe PO4) is considered as a promising cathode material for high power density lithium ion battery due to its high capacity, long cycle life, environmental friendly, low cost, and safety consideration. The theoretical capacity of Li Fe PO4 based on one electron reaction is 170 m Ah g-1at the stable voltage plateau of 3.5 V vs. Li/Li+. However, the instinct drawbacks of olivine structure induce a poor rate performance, resulting from the low lithium ion diffusion rate and low electronic *** this review, we summarize the methods for enhancing the rate performance of Li Fe PO4 cathode materials,including carbon coating, elements doping, preparation of nanosized materials, porous materials and composites,etc. Meanwhile, the advantages and disadvantages of above methods are also discussed.

关键词： LiFePO4 Lithium ion battery rate performance

Highly Efficient random Terpolymers for Photovoltaic Applications with Enhanced Absorption and Molecular Aggregation

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Chinese Journal of Polymer Science 2017年第2期35卷 249-260页

作者： Xiao-peng Xu Guang-jun Zhang Yun-zhe Zhao 刘江 Ying Li 彭强 Key Laboratory of green Chemistry and technology of Ministry of Education College of ChemistryState Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610064China chengdu green energy and green manufacturing technology r&d Center Chengdu 610207China

A series of copolymers, based on benzo[1,2-b：4,5-b＇]dithiophene （BdT） as the electron donor and 2,1,3- benzothiadiazole （BT）/diketopyrrolo[3,4-c]pyrrole （dPP） as the electron acceptors, were synthesized for highly efficient polymer solar cells. By changing the BT/dPP ratio in the conjugated backbone, the absorption, energy levels, molecular aggregation and carrier mobility could be finely tuned. With increased dPP content, the absorption range was extended to the longer wavelength region with narrower bandgaps. The highest occupied molecular orbital （HOMO） levels were also raised up and the molecular aggregation was enhanced. The balance of these factors would afford a remarkable device performance enhancement. Polymer P3 with BT：dPP = 0.7：0.3 （molar ratio） exhibited the highest power conversion efficiency （PCE） of 9.01%, with open circuit voltage （Voc） = 0.73 V, short current density （Jsc） = 18.45 ***-2, and fill factor （FF） - 66.9%. The PCE value was improved by 48.7% compared to P1 and by 117.6% compared to P7, respectively, indicating a great potential in photovoltaic application.

关键词： Polymer solar cells Terpolymers Complementary absorption Molecular aggregation

Substitute of Expensive Pt with Improved Electrocatalytic Performance and Higher resistance to CO Poisoning for Methanol Oxidation: the Case of Synergistic Pt-Co_3O_4 Nanocomposite

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Nano-Micro Letters 2013年第4期5卷 296-302页

作者： Hongxiao Zhao Zhi Zheng Jing Li Huimin Jia Ka-wai Wong Yidong Zhang Woon Ming Lau Key Laboratory of Micro-Nano Materials for energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials Xuchang University chengdu green energy and green manufacturing r&d Center

In this paper, Pt-Co_3O_4 nanocomposite was synthesized by a sol gel process combined with electrodeposition method. Its electrocatalytic activity towards methanol oxidation was investigated at room temperature using cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and current density time curve. It is found that the resultant Pt-Co_3O_4 catalysts with minute amount of Pt exhibite attractive electrocatalytic activity for methanol oxidation reaction(MOr) but with a high resistance CO poisoning due to the synergistic effects from Pt and Co_3O_4. Together with the low manufacturing cost of Co_3O_4, the reported nanostructured Pt-Co_3O_4 catalyst is expected to be a promising electrode material for direct methanol fuel cells(dMFC).

关键词： Pt-Co3O4 nanocomposite MOr Electrocatalytic activity

FAPbxSn1-xI3 mixed metal halide perovskite with improved light harvesting and stability for efficient planar heterojunction solar cells

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FAPbxSn1-xI3 mixed metal halide perovskite with improved lig...

第三届新型太阳能电池学术研讨会

作者： Jiang Liu Gang Wang Xulin He Qinyan Ye Cheng Liao Jun Mei Woonming Lau chengdu green energy and green manufacturing technology r&d centre Chengdu Development Center of Science and TechnologyChina Academy of Engineering Physics School of Materials Southwest University of Science and Technology

Organic-inorganic halide perovskite possess excellent chemical,optical,and electronic properties that make them attractive for next-generation solar ***-based(FA-based) perovskite has been demonstrated to have improved thermal stability and broadened absorption region compared to methylammonium-based(MA-based) *** important target for the further improvement of perovskite-based solar cell is to eliminate or reduce the use of heavy metal ***,we show that high performance perovskite solar cell with improved light harvesting and stability could be achieved by partially replacing Pb with *** Pb FA-based perovskites tend to convert to yellow nonperovskite phase upon exposure to atmosphere,while pure Sn FA-based perovskites exhibit very poor stability due to the oxidization of Sn to *** systematically investigated the performance of FAPbSnI mixed metal halide *** the Pb cation was substituted by 30 mol% of Sn cation,the annealed sample adopts the pseudocubic tetragonal P4 mm structure instead of trigonal p63 mc structure,which could be used to explain the narrowing of the ***,the addition of Sn led to the stabilization of the perovskite phase and a low temperature of 100 ℃ is enough to result in formation of perovskite *** PCE of the solar cells fabricated in this study exhibits a value of over 10% at x=0.5,owing to the improved light harvesting in spite of the reduced open *** more Sn was added,the device performance gradually deteriorates.

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Highly efficient planar perovskite solar cells with reduced hysteresis via bottom passivation and Cl incorporation

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Highly efficient planar perovskite solar cells with reduced ...

第五届新型太阳能电池学术研讨会

作者： Jiang Liu Zhen Song Gang Wang Wentao Zuo Cheng Liao chengdu green energy and green manufacturing technology r&d centre Chengdu Development Center of Science and Technology China Academy of Engineering Physics Science and technology on Surface Physics and Chemistry Laboratory School of Materials Southwest University of Science and Technology

during the past few years,organic-inorganic hybrid perovskite materials have attracted incredible interest from the photovoltaic community,with certified efficiency now over 20%.Obtaining high-quality electron-and hole-transporting interfaces in perovskite-based devices is crucial for efficient planar perovskite solar

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Understanding the evolution of photovoltaic performance in perovskite/spiro-OMeTAd solar cells

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Understanding the evolution of photovoltaic performance in p...

第四届新型太阳能电池学术研讨会

作者： Zhen Song Jiang Liu Gang Wang Wentao Zuo Cheng Liao Jun Mei chengdu green energy and green manufacturing technology r&d centre Chengdu Development Center of Science and TechnologyChina Academy of Engineering Physics Science and technology on Surface Physics and Chemistry Laboratory School of Materials Southwest University of Science and Technology

Lead halide perovskite solar cells(PSCs) with remarkable power conversion efficiency have attracted tremendous attention in recent ***, there still exist lots of problems which are not completely understood, and further studies are ***, the hole-transport layer(HTL) dependence of the photovoltaic performance evolution of perovskite solar cells is investigated in *** found that the freshly prepared devices using pristine spiro-OMeTAd and Li-doped spiro-OMeTAd as HTLs always exhibited S-shaped J-V curves with poor fill factor(FF).The devices showed progressively improved FF and efficiencies when exposed to air, which is attributed to air-exposure induced conductivity improvement in spiro-OMeTAd *** introducing a cobalt salt dopant(FK209) into spiro-OMeTAd layer, the corresponding devices showed remarkable performance without the need of air *** results confirmed that the dopant not only increases the conductivity of spiro-OMeTAd layer, but also tunes the surface potential, and this helps to improve the charge transport and reduce the recombination loss.

关键词： photovoltaic performance evolution spiro-OMeTAd conductivity surface potential

Low-temperature, solution processed metal sulfide as electron transport layer for efficient planar perovskite solar cells

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Low-temperature, solution processed metal sulfide as electro...

第二届新型太阳能电池学术研讨会

作者： Jiang Liu Cheng Gao Lizhu Luo Qinyan Ye Xulin He Liangqi Ouyang Xiaowei Guo daming Zhuang Cheng Liao Jun Mei Woonming Lau chengdu green energy and green manufacturing technology r&d centre Chengdu Development Center of Science and Technology China Academy of Engineering Physics School of Optoelectronic Information University of Electronic Science and Technology Science and technology and Surface Physics and Chemistry Laboratory School of Materials Science and Engineering Tsinghua University

Organic-inorganic halide perovskites possess excellent chemical,optical,and electronic properties that make them attractive for next-generation solar *** this paper,we introduce all-low-temperature processed perovskite solar cells using metal sulfide as electron transport ***,we evaluated the alignment of energy levels at the

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The Clustering of Zn6Y9 and Its Predominant role in Long Period Stacking Order Phases in Mg-Zn-Y Alloys: a First-principles Study

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The Clustering of Zn6Y9 and Its Predominant Role in Long Per...

中国材料大会2012

作者： Shangyi Ma Limin Liu Shaoqing Wang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Beijing Computational Science research Center Chinese Academy of Engineering Physics chengdu green energy and green manufacturing technology r&d Center

ISBN: (纸本)9783037856093

The local structures of Zn and Y in the long period stacking order （LPSO） phase in Mg-Zn-Y system were investigated by first principles calculations in details. The clustering of Zn and Y atoms ranging from single stacking fault layer to four consecutive layers was explicitly demonstrated. The calculations indicate that Zn and Y atoms prefer clustering in the form of Zn6Y9 embedding in ABCA-type building block to hthe random or ordered arrangements of Zn and Y atoms being enriched in two stacking fault layers. The cluster of Zn6Y9 can be regarded as the ideal stoichiometric component of LPSO and it plays a predominant role in the LPSO phases. The formation of LPSO phases is highly associated with the Zn6Y9 cluster and its derivatives.

关键词： Magnesium alloys Long period stacking order phases First-principles study

Pushing the Electrochemical Performance Limits of Polypyrrole Toward Stable Microelectronic devices

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Nano-Micro Letters 2023年第4期15卷 58-75页

作者： Muhammad Tahir Liang He Lihong Li Yawei Cao Xiaoxia Yu Zehua Lu Xiaoqiao Liao Zeyu Ma Yanlin Song Key Laboratory of green Printing CAS Research/Education Centre for Excellence in Molecular SciencesInstitute of Chemistry Chinese Academy of Sciences(ICCAS)Beijing 100190People’s Republic of China School of Mechanical Engineering Sichuan UniversityChengdu 610065People’s Republic of China Med+X Center for manufacturing West China HospitalSichuan UniversityChengdu 610041People’s Republic of China School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China

Conducting polymers have achieved remarkable attentions owing to their exclusive characteristics,for instance,electrical conductivity,high ionic conductivity,visual transparency,and mechanical *** and nanostructure engineering of conjugated conducting polymers offers an exceptional pathway to facilitate their implementation in a variety of scientific claims,comprising energy storage and production devices,flexible and wearable optoelectronic devices.A two-step tactic to assemble high-performance polypyrrole(PPy)-based microsupercapacitor(MSC)is utilized by transforming the current collectors to suppress structural pulverization and increase the adhesion of PPy,and then electrochemical co-deposition of PPy-CNT nanostructures on rGO@Au current collectors is *** resulting fine patterned MSC conveyed a high areal capacitance of 65.9 mF cm^(−2)(at a current density of 0.1 mA cm^(−2)),an exceptional cycling performance of retaining 79%capacitance after 10,000 charge/discharge cycles at 5 mA cm^(−2).Benefiting from the intermediate graphene,current collector free PPy-CNT@rGO flexible MSC is produced by a facile transfer method on a flexible substrate,which delivered an areal capacitance of 70.25 mF cm^(−2) at 0.1 mA cm^(−2) and retained 46%of the initial capacitance at a current density of 1.0 mA cm^(−2).The flexible MSC is utilized as a skin compatible capacitive micro-strain sensor with excellent electromechanochemical characteristics.

关键词： Microsupercapacitor Skin-compatible device Strain sensor Flexible electronics