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Composite solid electrolyte of Na3PS4-PEO for all-solid-state SnS2/Na batteries with excellent interfacial compatibility between electrolyte and Na metal

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Journal of Energy Chemistry 2020年第2期29卷 73-78页

作者： Xiaoyan Xu Yuanyuan Li Jun Cheng Guangmei Hou xiangkun nie Qing Ai Linna Dai Jinkui Feng Lijie Ci SDU& Rice Joint Center for Carbon Nanomaterials Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education)School of Materials Science and EngineeringShandong UniversityJinan 250061ShandongChina

High ionic conductivity and superior interfacial stability of solid electrolytes at the electrodes are crucial factors for high-performance all-solid-state sodium batteries. Herein, a composite solid electrolyte Na3PS4-polyethylene oxide is synthesized by the solution-phase reaction method with an improved ionic conductivity up to 9.4 × 10-5 S/cm at room temperature. Moreover, polyethylene oxide polymer layer is wrapped homogeneously on the surface of Na3PS4 particles, which could effectively avoid the direct contact between Na3PS4 electrolyte and sodium metal, thus alleviate their side reactions. We demonstrate that all-solid-state battery SnS2/Na with the composite solid electrolyte Na3PS4-polyethylene oxide delivers an enhanced electrochemical performance with 230 m Ah/g after 40 cycles.

关键词： Composite solid electrolyte Na 3PS4 All-solid-state sodium battery SnS2

Ag doped urchin-like α-MnO2 toward efficient and bifunctional electrocatalysts for Li-02 batteries

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Nano Research 2020年第9期13卷 2356-2364页

作者： Linna Dai Qing Sun Lina Chen Huanhuan Guo xiangkun nie Jun Cheng Jianguang Guo Jianwei Li Jun Lou Lijie Ci Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education) Research Center for Carbon NanomaterialsSchool of Materials Science and EngineeringShandong UniversityJinan 250061China Department of Materials Science and Nano Engineering Rice UniversityHoustonTexas 77005USA School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Rechargeable Li-O2 batteries (LOBs) have been receiving intensive attention because of their ultra-high theoretical energy densityclose to the gasoline. Herein, Ag modified urchin-like α-MnO2 (Ag-MnO2) material with hierarchical porous structure is obtained bya facile one-step hydrothermal method. Ag-MnO2 possesses thick nanowires and presents hierarchical porous structure of mesoporesand macropores. The unique structure can expose more active sites, and provide continuous pathways for O2 and discharge productsas well. The doping of Ag leads to the change of electronic distribution in α-MnO2 (i.e., more oxygen vacancies), which playimportant roles in improving their intrinsic catalytic activity and conductivity. As a result, LOBs with Ag-MnO2 catalysts exhibit loweroverpotential, higher discharge specific capacity and much better cycle stability compared to pure a-MnO2. LOBs with Ag-MnO2catalysts exhibit a superior discharge specific capacity of 13,131 mA·h·g^-1 at a current density of 200 mA·h·g^-1, a good cycle stabilityof 500 cycles at the capacity of 500 mA·h·g^-1. When current density is increased to 400 mA·h·g^-1, LOBs still retain a long lifespan of170 cycles at a limited capacity of 1,000 mA·h·g^-1.

关键词： Li-O2 batteries Ag doped urchin-like MnO2 electronic structure cycling stability

Facile construction of a multilayered interface for a durable lithium‐rich cathode

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Carbon Energy 2023年第9期5卷 74-87页

作者： Zhou Xu Yifei Yuan Qing Tang xiangkun nie Jianwei Li Qing Sun Naixuan Ci Zhenjie Xi Guifang Han Lijie Ci Guanghui Min Key Laboratory for Liquid–Solid Structural Evolution&Processing of Materials(Ministry of Education) Research Center for Carbon NanomaterialsSchool of Materials Science and EngineeringShandong UniversityJinanChina College of Chemistry and Materials Engineering Wenzhou UniversityWenzhouChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)ShenzhenChina

Layered lithium-rich manganese-based oxide(LRMO)has the limitation of inevitable evolution of lattice oxygen release and layered structure ***,a multilayer reconstruction strategy is applied to LRMO via facile pyrolysis of potassium Prussian *** multilayer interface is visually observed using an atomic-resolution scanning transmission electron microscope and a high-resolution transmission electron *** with the electrochemical characterization,the redox of lattice oxygen is suppressed during the initial *** situ X-ray diffraction and the high-resolution transmission electron microscope demonstrate that the suppressed evolution of lattice oxygen eliminates the variation in the unit cell parameters during initial(de)lithiation,which further prevents lattice distortion during long *** a result,the initial Coulombic efficiency of the modified LRMO is up to 87.31%,and the rate capacity and long-term cycle stability also improved *** this work,a facile surface reconstruction strategy is used to suppress vigorous anionic redox,which is expected to stimulate material design in high-performance lithium ion batteries.

关键词： lattice oxygen release lithium‐rich manganese‐based oxide cathodes reconstructed multilayer interface spinel phase transition‐metal ion migration

Reversible LiOH chemistry in Li-O_(2)batteries with free-standing Ag/δ-MnO_(2)nanoflower cathode

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Science China Materials 2022年第6期65卷 1431-1442页

作者： Linna Dai1 Qing Sun Yuqing Yao Huanhuan Guo xiangkun nie Jianwei Li Pengchao Si Jingyu Lu Deping Li Lijie Ci Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education) Research Center for Carbon NanomaterialsSchool of Materials Science and EngineeringShandong UniversityJinan 250061China State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

The low energy efficiency and poor cycle stability arising from the high aggressivity of discharge products toward organic electrolytes limit the practical applications of Li-O_(2)batteries(LOBs).Compared with the typical discharge product Li_(2)O_(2),LiOH shows better chemical and electrochemical *** this study,a free-standing cathode composed of hydrangea-likeδ-MnO_(2)with Ag nanoparticles(NPs)embedded in carbon paper(CP)(Ag/δ-MnO_(2)@CP)is fabricated and used as the catalyst for the reversible formation and decomposition of *** possible discharge mechanism is investigated by in situ Raman measurement and density functional theory *** confirm thatδ-MnO_(2)dominantly catalyzes the conversion reaction of discharge intermediate LiO_(2)*to LiOH and that Ag particles promote its catalytic *** the presence of Ag/δ-MnO_(2)@CP cathode,the LOB exhibits enhanced specific capacity and a high discharge voltage plateau under humid O_(2)*** a current density of 200 mA g^(−1),the LOB with the Ag/δ-MnO_(2)@CP cathode presents an overpotential of 0.5 V and an ultra-long cycle life of 867 cycles with a limited specific capacity of 500 mA h g^(−1).This work provides a fresh view on the role of solid catalysts in LOBs and promotes the development of LOBs based on LiOH discharge product for practical applications.

关键词： Li-O_(2)batteries Ag nanoparticles δ-MnO_(2) reversible LiOH in situ Raman

粘胶基磷氧共掺杂活性碳纤维的制备及其常压储氢性能

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武汉大学学报(理学版) 2024年第5期70卷 595-602页

作者：聂祥坤乔营虞军伟山东体育学院体育科学研究院山东大学材料科学与工程学院山东大学光学高等研究中心

以工业化生产的低成本粘胶纤维为前驱体，采用超声辅助磷酸活化技术制备了一种粘胶基磷氧共掺杂活性碳纤维，在活化过程中实现了纳米孔隙及表面化学结构的同步构筑。活化剂磷酸用量为15%的活性碳纤维的比表面积、总孔体积分别达到1 184.... 详细信息

以工业化生产的低成本粘胶纤维为前驱体，采用超声辅助磷酸活化技术制备了一种粘胶基磷氧共掺杂活性碳纤维，在活化过程中实现了纳米孔隙及表面化学结构的同步构筑。活化剂磷酸用量为15%的活性碳纤维的比表面积、总孔体积分别达到1 184.51 m2/g、0.60 cm3/g，表面氧、磷原子相对百分含量分别达到15.25%、0.99%。研究表明，该活性碳纤维通过表面纳米孔隙结构和含氧/磷基团的耦合作用，实现了对氢气的物理/化学协同吸附、存储，在77 K、常压（100 kPa）条件下质量储氢密度达到2.19%。该活性碳纤维对氢气的吸附属于典型的Ⅰ型吸附，将孔隙结构界面分为非极性、弱极性和强极性3类的Langmuir（N=3）模型对该吸附过程具有最佳的拟合效果。

关键词：碳材料储氢技术氢能孔隙结构表面化学结构

富锂锰基正极材料的硫掺杂协同Cu9S5包覆改性

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武汉大学学报(理学版) 2024年第5期70卷 587-594页

作者：聂祥坤乔营孙威田雪文孙红梅慈立杰山东体育学院体育科学研究院山东大学材料科学与工程学院

采用溶胶凝胶法制备富锂锰基正极材料Li1.2Mn0.54Co0.13Ni0.13O2（LMO），并以硫代乙酰胺和硝酸铜作为硫源和铜源，通过溶剂热法结合高温煅烧工艺对LMO进行S2-掺杂和Cu9S5包覆，实现了LMO的表面改性。结果表明，用电负性较弱和离子半径... 详细信息

采用溶胶凝胶法制备富锂锰基正极材料Li1.2Mn0.54Co0.13Ni0.13O2（LMO），并以硫代乙酰胺和硝酸铜作为硫源和铜源，通过溶剂热法结合高温煅烧工艺对LMO进行S2-掺杂和Cu9S5包覆，实现了LMO的表面改性。结果表明，用电负性较弱和离子半径较大的S2-代替O2-，能够诱导LMO结构产生氧空穴，并调节结构中过渡金属元素的电子云排布；用电子电导率较高的Cu9S5包覆，能够有效缓解S2-掺杂的问题，并抑制界面副反应。改性后，质量分数1%Cu9S5包覆协同S2-掺杂的富锂锰基正极材料（1%CS@LMOS）具有最高的首圈放电比容量（290.6 m Ah/g）和首圈库仑效率（84.07%）、优异的倍率性能（5 C,151 m Ah/g）和循环稳定性（1 C,100圈，容量保持率92.76%）。此外，在充放电过程中，1%CS@LMOS材料的锂离子表观扩散速率均显著高于未改性材料。此改性方法有效提升了富锂锰基正极材料的电化学性能。

关键词：锂离子电池锰基正极材料电化学性能包覆掺杂改性

简化太极拳干预对慢性踝关节不稳定者康复效果及神经肌肉控制能力的影响

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中国运动医学杂志 2024年第9期43卷 681-688页

作者：许国才汤惠如范志龙王疆娜张翠聂祥坤山东体育学院山东济南250102 临沂市妇幼保健院山东临沂276000 山东省体育科学研究中心山东济南250014

目的:探讨为期12周的简化太极拳训练对慢性踝关节不稳定(chronic ankle instability,CAI)者康复效果及神经肌肉控制功能的影响。方法:将34例CAI者随机分为实验组和对照组。两组受试者分别接受为期12周的简化太极拳训练(实验组)和健康宣... 详细信息

目的:探讨为期12周的简化太极拳训练对慢性踝关节不稳定(chronic ankle instability,CAI)者康复效果及神经肌肉控制功能的影响。方法:将34例CAI者随机分为实验组和对照组。两组受试者分别接受为期12周的简化太极拳训练(实验组)和健康宣教(对照组)。干预前后分别对受试者主观不稳定感觉、踝关节肌力、本体感觉及动态姿势稳定性进行评估测试。结果:12周干预后,实验组的坎伯兰踝关节不稳量表(Cumberland Ankle Instability Tool,CAIT)评分,改良星形偏移平衡测试(the modified Star Excursion Balance Test,m SEBT)后内向和后外向的最大伸展距离,以及踝关节跖屈、内翻和外翻时的峰值力矩均显著增加(P<0.05);踝关节跖屈及内翻时的被动运动本体感觉阈值显著降低(P<0.05)。干预后,实验组CAIT评分、mSEBT中的后内向和后外向的最大伸展距离,以及踝关节跖屈、内翻及外翻时的峰值力矩均显著高于对照组(P<0.05);踝关节跖屈被动运动本体感觉阈值显著低于对照组(P<0.05)。结论:12周的简化太极拳训练可以改善CAI者的临床主观不稳定感,可能与踝关节肌力、本体感觉和动态姿势稳定性功能改善有关。建议将简化太极拳训练作为CAI者康复方法之一。

关键词：太极拳慢性踝关节不稳定动态姿势稳定性本体感觉肌肉力量

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废瓷砖再生砌筑砂浆性能试验研究

湖南科技大学学报（自然科学版） 2015年第1期30卷 67-71页

作者：聂忆华刘新海彭宇李祥坤杨晓林湖南科技大学土木工程学院湖南湘潭411201

将废瓷砖破碎成细集料,代替部分普通砂配制成废瓷砖再生砂,固定水泥、砂的用量比例与稠度制作砂浆试件,进行不同废瓷砖砂掺配率、不同养护时间下的强度试验和耐久性试验.试验结果表明：在同等条件下,掺配废瓷砖砂的再生砂浆较普通砂浆... 详细信息

将废瓷砖破碎成细集料,代替部分普通砂配制成废瓷砖再生砂,固定水泥、砂的用量比例与稠度制作砂浆试件,进行不同废瓷砖砂掺配率、不同养护时间下的强度试验和耐久性试验.试验结果表明：在同等条件下,掺配废瓷砖砂的再生砂浆较普通砂浆强度等级可提高1～2个级别,抗冻性能提高1倍以上;潜在的碱-硅酸反应危害小得多;且随着废瓷砖砂掺配率越高,砂浆抗压强度、抗折强度越高,后期抗冻性能越好,潜在的碱-硅酸反应越小.但普通砂浆后期具有收缩开裂的趋势,废瓷砖砂砂浆后期具有膨胀的趋势.

关键词：废瓷砖砂砂浆强度耐久性试验

拮抗细菌枯草芽孢杆菌T429喷雾干燥工艺研究

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中国生物防治学报 2014年第1期30卷 101-106页

作者：孟祥坤于俊杰尹小乐聂亚锋俞咪娜陈志谊刘永锋江苏省农业科学院植物保护研究所南京210014

本研究前期成功分离获得1株对水稻真菌病害具有较强抑制作用的枯草芽孢杆菌T429,为开发生防菌农药新剂型,利用喷雾干燥法对生防菌T429发酵液进行处理,以喷雾干燥后产物活菌量为主要指标,采用单因素和正交试验法,对影响喷雾干燥产物指标... 详细信息

本研究前期成功分离获得1株对水稻真菌病害具有较强抑制作用的枯草芽孢杆菌T429,为开发生防菌农药新剂型,利用喷雾干燥法对生防菌T429发酵液进行处理,以喷雾干燥后产物活菌量为主要指标,采用单因素和正交试验法,对影响喷雾干燥产物指标的主要因素进行优化。结果表明,最佳喷雾干燥条件为进风温度120℃、进样速度720 mL/h、雾化口径1 mm、雾化压力0.1 MPa、热风流量30 M3/h,可获得产物活菌量达8.61×109 cfu/g。该工艺稳定、可控,为以枯草芽孢杆菌为核心的微生物杀菌剂新剂型的研发提供了科学依据。

关键词：枯草芽孢杆菌农药剂型喷雾干燥正交试验