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Na doping and CeO2 surface modification enhancing the Li-rich Li1.2Mn0.54Ni0.13Co0.13O2 cathode material for lithium-ion battery

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SSRN 2024年

作者： Li, Yu Feng, Xiang-Yu Ran, Mao-Jin Yuan, Man-Man Wei, Mei-Tong Wu, Liang Hu, Zhi-Yi Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Xiangyang Polytechnic 18 Longzhong Road Hubei Xiangyang441050 China University of Namur NamurB-5000 Belgium

Li-rich Mn-based layered oxides with high specific capacity and operating voltages become one of the most promising materials for lithium-ion batteries (LIBs). However, it still faces several issues on low initial coulombic efficiency, poor electronic conductivity and voltage fading due to oxygen release and transition metals rearrangement during cycling. In this study, Li1.2Mn0.54Ni0.13Co0.13O2 (LMR) cathode material with Na ion doping (LMNaR) and CeO2 surface modification (LMNaR@CeO2) is prepared to realize the synergistic modification effect. The doping of Na ions enlarges Li layer spacing to effectively promote the insertion and extraction of lithium ions, which makes the layered structure more stable to reduce the effect of phase transition. And the CeO2 surface modification restrains the side reactions between electrode and electrolyte, and stabilizes lattice oxygen and eases oxygen release. As a result, the LMNaR@CeO2 displays a specific capacity of 196 mAh·g-1 after 100 cycles at 0.5 C with a capacity retention of 94% and a merely voltage decay of 0.16 V, which are much better than the LMR with a specific capacity of 159.6 mAh·g-1 and only a 79% capacity retention. Our strategy here provides a feasible approach for the development of Li-rich Mn-based anode materials for long life LIBs. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Development of innovative and green adsorbents for in situ cleanup of fluoride-polluted groundwater: Mechanisms and field-scale studies

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Chemosphere 2024年 350卷 141035页

作者： Ou, Jiun-Hau Wang, Chih-Chieh Verpoort, Francis Chien, Chih-Ching Zhong, Hua-Bin Kao, Chih-Ming Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung Taiwan Hershey Environmental Technology Corp. Ltd. Kaohsiung Taiwan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Graduate School of Biotechnology and Bioengineering Yuan Ze University Chung-Li City Taoyuan Taiwan

In this study, the magnesium oxide (MgO)-based adsorbents [granulated MgO aggregates (GA-MgO) and surface-modified MgO powder (SM-MgO)] were developed to remediate a fluoride-contaminated groundwater site. Both GA-MgO and SM-MgO had porous, spherical, and crystalline structures. Diameters for GA-MgO and SM-MgO were 1–1.7 mm and 1–10 μm, respectively. The pseudo second-order dynamic adsorption and the Freundlich isotherm could be applied to express the chemical adsorption phenomena. The monolayer adsorption was the dominant mechanism at the initial adsorption period. During the latter part of fluoride adsorption, the multilayer adsorption became the dominant mechanism for fluoride removal from the water phase, which also resulted in the increased adsorption capacity. Higher hydroxide, phosphate, and carbonate concentrations caused a decreased fluoride removal efficiency due to the competition of sorption sites between fluoride and other anions with similar electronic properties. Fluoride removal mechanism using GA-MgO and SM-MgO as the adsorbents was mainly carried out by the chemical adsorption. Reaction paths contained two main processes: (1) formation of magnesium hydroxide after the reaction of MgO with water, and (2) the hydroxyl group of the magnesium hydroxide was replaced by fluoride ions to form magnesium fluoride precipitation. Results from column tests show that up to 61 and 73% of fluoride removal (initial fluoride concentration = 9.3 mg/L) could be obtained after 50 pore volumes of groundwater pumping with GA-MgO and SM-MgO injection, respectively. The GA-MgO system could be applied to contain and remediate fluoride-contaminated groundwater, and SM-MgO could be applied as an immediate fluoride removal alternative to achieve a rapid pollutant removal for emergency responses. Up to 71% of fluoride removal (fluoride concentration = 10.8 mg/L) could be obtained with GA-MgO injection after 30 days of operation. The developed GA-MgO system is a potential and g

关键词： Magnesia

Na Doping and Ceo2 Coating Enhancing the Li-Rich Li1.2mn0.54ni0.13co0.13o2 Cathode Material for Lithium-Ion Battery

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SSRN 2024年

作者： Li, Yu Feng, Xiang-Yu Ran, Mao-Jin Yuan, Man-Man Peng, Yan Luo, Bi-Cheng Wei, Mei-Tong Wu, Liang Hu, Zhi-Yi Chen, Li-Hua Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Xiangyang Polytechnic 18 Longzhong Road Hubei Xiangyang441050 China University of Namur NamurB-5000 Belgium

Li-rich Mn-based layered oxides with high specific capacity (>250 mAh·g-1) and operating voltages become one of the most promising materials for lithium-ion batteries (LIBs). However, it still faces several issues on low initial coulombic efficiency, poor electronic conductivity and voltage fading due to oxygen release and transition metals rearrangement during cycling. In this study, Li1.2Mn0.54Ni0.13Co0.13O2 (LMR) cathode material with Na ion doping (LMNaR) and surface CeO2 coating (LMNaR@CeO2) is successfully prepared via a simple co-precipitation and wet chemical to realize the synergistic modification effect. On one hand, the doping of Na ions enlarges Li layer spacing to effectively promote the insertion and extraction of lithium ions. Meanwhile, due to the larger radius of Na ions, the layered structure becomes more stable, thus reducing the effect of phase transition. On the other hand, the CeO2 coating layer restrains the side reaction between electrode and electrolyte, and stabilizes lattice oxygen and eases oxygen release. The electrochemical results illustrate that the LMNaR@CeO2 exhibits outstanding electrochemical capabilities. Notably, it displays a specific capacity of 196 mAh·g-1 after 100 cycles at 0.5 C with a capacity retention of 94% and a merely voltage decay of 0.16 V, which are much better than the LMR with a specific capacity of 159.6 mAh·g-1 and only a 79% capacity retention. Our strategy here provides a feasible approach for the development of Li-rich Mn-based anode materials for long life LIBs. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Three-Dimensional Porous Polyimide Anode For High-Rate Lithium Ion Batteries

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SSRN 2023年

作者： Zhang, Qiuyitong Wei, Zijie Xu, Yuexin Lv, Ning Li, Hanyang Zhao, Xue Tian, Tian Wang, Yadong Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China Xupu Central Primary School Yangzhou211400 China

Polymeric electrode materials suffer from poor electrical conductivity and slow transport kinetics, especially poor performance at high current density. Herein, a polyimide electrode structure with 3D ordered interconnected gradient pores is proposed for improving the lithium ion transport efficiency. The homogeneous mixed PMTA-PMMA composite is prepared by a simple one-pot method, and then the PMMA (polymethyl methacrylate) spherical porogenic agent is removed from it while synthesizing the polyimide material at high temperature to form a low curvature gradient pore structure. The large pores in the electrode can enhance the ion transport ability and improve the electrolyte infiltration rate, and the small pores can improve the active specific surface area and guide the deposition of lithium ions. The high specific capacity of 907mAh/g can be maintained even after 1000 cycles at 5A/g, which is about 3 times of the specific capacity of un-pored electrode material. This porous material with high active area and porosity is a potential electrode candidate for ultra-fast charging and discharging in lithium ion batteries, with high specific capacity and excellent cycling performance. © 2023, The Authors. All rights reserved.

关键词： Polyimides

Strongly Enhancing the Energy Storage Properties and Stability of Amorphous BaTiO3 Thin Films via Ions Doping

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SSRN 2024年

作者： Chang, Ruiling Yao, Zhonghua Xing, Yutong Wang, Jun Hao, Hua Cao, Minghe Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000 China

Amorphous thin films with high power density and breakdown strength satisfy the needs of advanced power electronic systems. Nonetheless, improving the energy storage density of amorphous films is critical for addressing the growing demand for electricity. We apply high spontaneous polarization BaTiO3 as the main component to make (1-x)Ba(Ti0.99Mn0.02)O3-xBiFeO3((1-x)BTM-xBF) thin films. Doping BiFeO3 (BF) synergistically boosts polarization. The introduction of amorphous phases and Mn ions enhances the breakdown strength. The results demonstrate that, at x=0.10, the film can achieve both a high efficiency of 80.3% and an excellent energy storage density of 111.3 J cm-3. Moreover, the film has a strong thermal stability within a broad range of 20°C ~ 160°C, as well as the cycling reliability is as high as 105 times. The present study offers a practical approach to develop film capacitors with outstanding energy storage capabilities. © 2024, The Authors. All rights reserved.

关键词： Amorphous films

Electron transfer kinetics in CdS/Pt heterojunction photocatalyst during water splitting

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Chinese Journal of Catalysis 2022年第10期43卷 2530-2538页

作者： Jianjun Zhang Gaoyuan Yang Bowen He Bei Cheng Youji Li Guijie Liang Linxi Wang Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina College of chemistry and Chemical engineering Jishou UniversityJishou 416000HunanChina

Noble metal cocatalysts have shown great potential in boosting the performance of CdS in photocatalytic water ***,the mechanism and kinetics of electron transfer in noble-metal-decorated CdS during practical hydrogen evolution is not clearly ***,Pt-nanoparticle-decorated CdS nanorods(CdS/Pt)are utilized as the model system to analyze the electron transfer kinetics in CdS/Pt *** femtosecond transient absorption spectroscopy,three dominating exciton quenching pathways are observed and assigned to the trapping of photogenerated electrons at shallow states,recombination of free electrons and trapped holes,and radiative recombination of locally photogenerated electron-hole *** introduction of Pt cocatalyst can release the electrons trapped at the shallow states and construct an ultrafast electron transfer tunnel at the CdS/Pt *** CdS/Pt is dispersed in acetonitrile,the lifetime and rate for interfacial electron transfer are respectively calculated to be~5.5 ps and~3.5×10^(10) s^(−1).The CdS/Pt is again dispersed in water to simulate photocatalytic water *** lifetime of the interfacial electron transfer decreases to~5.1 ps and the electron transfer rate increases to~4.9×10^(10) s^(−1),confirming that Pt nanoparticles serve as the main active sites of hydrogen *** work reveals the role of Pt cocatalysts in enhancing the photocatalytic performance of CdS from the perspective of electron transfer kinetics.

关键词： Femtosecond transient absorption spectroscopy Photocatalytic water splitting CdS Electron transfer kinetics Trap state

富羟基PtNi纳米粒子作为海水中电化学析氢反应的高效催化剂（英文）

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Science China materials 2025年

作者：赵文英杨雄肖宇轩余菲田歌沈凌卢毅耿伟吴思明应杰 Ion Tiginyanu Kenneth I. Ozoemena 阳晓宇 State Key Laboratory of Silicate Materials for Architectures & State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of Chemistry Chemical Engineering and Life Sciences & Laoshan Laboratory & School of Materials Science and Engineering & International School of Materials Science and Engineering Wuhan University of Technology School of Chemical Engineering and Technology Sun Yat-sen University National Center for Materials Study and Testing Technical University of Moldova Molecular Sciences Institute School of Chemistry University of the Witwatersrand National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

Cl-吸附及腐蚀效应是Pt基催化剂在海水析氢反应（HER）中性能的主要障碍.虽然引入羟基是提升HER动力学和缓解氯毒化的有效策略,但在Pt基催化剂体系中实现这一策略仍具挑战性.本研究通过高温还原法制备了具有Ni空位（路易斯酸位点）的PtN...

Cl-吸附及腐蚀效应是Pt基催化剂在海水析氢反应（HER）中性能的主要障碍.虽然引入羟基是提升HER动力学和缓解氯毒化的有效策略,但在Pt基催化剂体系中实现这一策略仍具挑战性.本研究通过高温还原法制备了具有Ni空位（路易斯酸位点）的PtNi合金纳米颗粒.路易斯酸位点促进Ni-LDH载体上晶格羟基向表面羟基的转化.Ni-LDH的晶格羟基通过与路易斯酸位点相互作用,产生表面羟基并协同提升其表面亲水性.这种双功能特性既能促进水分子吸附,又可抑制Cl-吸附.优化后的PtNi/Ni-LDH在碱性真实海水中展现出优异的HER性能,仅需1 9 mV过电位即可达到1 0 mA cm-2电流密度,塔菲尔斜率为31 mV dec-1,并在100小时耐久性测试中具有优异的稳定性.该研究为通过定向羟基工程设计高效海水裂解催化剂提供了理论基础.

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Three-Dimensional Porous Polyimide Anode For High-Rate Lithium Ion Batteries

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SSRN 2023年

作者： Zhang, Qiuyitong Wei, Zijie Xu, Yuexin Lv, Ning Li, Hanyang Tian, Tian Wang, Yadong Tang, Haolin Zhao, Xue State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China Xupu Central Primary School Yangzhou211400 China

关键词： Polyimides

Crystalline porous materials:from zeolites to metal-organic frameworks(MOFs)

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Frontiers of Chemical Science and Engineering 2020年第2期14卷 123-126页

作者： Zaiku Xie Bao-Lian Su State Key Laboratory of Green Chemical Engineering and Industrial Catalysis Sinopec Shanghai Research Institute of Petrochemical TechnologyShanghai 201208China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamurBelgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430074China

As a class of important crystalline porous materials,zeolites which were first found in 1756 have now been widely used in chemical industries for catalysis,adsorption and separation.35232 patents with the title including Hzeolite*n are documented by Derwent Innovations Index on January 2,2020[1].Despite of spread applications of zeolites and related-materials in industry,fundamental research of zeolites and their applications are still desired in both academia and industry,as shown in Fig.1.

关键词： porous zeolites zeolite