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Ni-P-SBR composite-electroless-plating enables Si anode with high conductivity and elasticity for high performance Li-ion batteries application

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Journal of Energy Chemistry 2023年第1期76卷 59-66,I0003页

作者： Yuxiao Wang Jian Gou hongzhang zhang Xiaofei Yang Huamin zhang Xianfeng Li Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100039China

Silica-based anode is widely employed for high energy density Li-ion batteries owing to their high theoretical specific capacity(4200 m A h g-1).However,it is always accompanied by a huge volume expansion(300%)and shrinks during the lithiation/delithiation process,further leading to low cycle stability.Efforts to mitigate the adverse effects caused by volume expansion such as robust binder matrix,Coreshell structure,etc.,inevitably affect the electronic conductivity within the electrode.Herein,a high conductivity and elasticity Si anode(Ni-P-SBR(styrene-butadiene rubber)@Si)was designed and fabricated via the Ni-P-SBR composite-electroless-plating process.In this design,the Si particles are surrounded by SBR polymer and Ni particles,where the SBR can adapt to the volume change and Ni particles can provide the electrode with high electronic conductivity.Therefore,the Ni-P-SBR@Si delivers a high initial capacity of 3470 m A h g-1and presents capacity retention of 49.4%within 200 cycles at 600 m A g-1.Additionally,a high capacity of 1153 m A h g-1can be achieved at 2000 m A g-1and can be cycled stably under bending conditions.This strategy provides feasible ideas to solve the key issues that limit the practical application of Si anodes.

关键词： Silicon anode Volume expansion Composite-electroless-plating High elasticity High electronic conductivity

Magnetron sputtering NbSe_(2)film as lubricant for space current-carrying sliding contact

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Friction 2023年第3期11卷 383-394页

作者： Yang YANG Lulu PEI hongzhang zhang Kai FENG Pengfei JU Wenshan DUAN Li JI Hongxuan LI Xiaohong LIU Huidi ZHOU Jianmin CHEN Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Insttute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China Division of Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry&Engineering Yantai UniversityYantai 264005China Shanghai Aerospace Equipment Manufacture Shanghai 200245China

This study demonstrates that magnetron-sputtered NbSe_(2)film can be used as a lubricant for space current-carrying sliding contact,which accommodates both metal-like conductivity and MoS_(2)-like lubricity.Deposition at low pressure and low energy is performed to avoid the generation of the interference phase of NbSe_(3).The composition,microstructure,and properties of the NbSe_(2)films are further tailored by controlling the sputtering current.At an appropriate current,the film changed from amorphous to crystalline,maintained a dense structure,and exhibited excellent comprehensive properties.Compared to the currently available electrical contact lubricating materials,the NbSe_(2)film exhibits a significant advantage under the combined vacuum and current-carrying conditions.The friction coefficient decreases from 0.25 to 0.02,the wear life increases more than seven times,and the electric noise reduces approximately 50%.

关键词： NbSe_(2)films magnetron sputtering vacuum current-carrying tribological properties

Nanostructured Mn-based oxides as high-performance cathodes for next generation Li-ion batteries

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Journal of Energy Chemistry 2021年第8期30卷 547-571,I0012页

作者： Guodong Hao Qinzhi Lai hongzhang zhang School of Chemistry and Chemical Engineering Mudanjiang Normal UniversityMudanjiang 157011China Department of Chemistry College of SciencesNortheastern UniversityShenyang 110819China Division of Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Mn-based oxides have been regarded as a promising family of cathode materials for high-performance lithium-ion batteries,but the practical applications have been limited because of severe capacity deterioration(such as Li Mn O_(2)and Li Mn_(2)O_(4))as well as further complications from successive structure changes during cycling,low initial coulombic efficiency(such as Li-rich cathode)and oxidization of organic carbonate solvents at high charge potential(such as Li Ni0.5 Mn1.5 O4).Large amounts of efforts have been concentrated on resolving these issues towards practical applications,and many vital progresses have been carried out.Hence,the primary target of this review is focused on different proposed strategies and breakthroughs to enhance the rate performance and cycling stability of nanostructured Mn-based oxide cathode materials for Li-ion batteries,including morphology control,ion doping,surface coatings,composite construction.The combination of delicate architectures with conductive species represents the perspective ways to enhance the conductivity of the cathode materials and further buffer the structure transformation and strain during cycling.At last,based on the elaborated progress,several perspectives of Mn-based oxide cathodes are summarized,and some possible attractive strategies and future development directions of Mn-based oxide cathodes with enhanced electrochemical properties are proposed.The review will offer a detailed introduction of various strategies enhancing electrochemical performance and give a novel viewpoint to shed light on the future innovation in Mn-based oxide cathode materials,which benefits the design and construction of high-performance Mn-based oxide cathode materials in the future.

关键词： Mn-based oxide Cathode material Electrochemical property Modification

Effect of the pore length and orientation upon the electrochemical capacitive performance of ordered mesoporous carbons

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Journal of Energy Chemistry 2017年第1期26卷 121-128页

作者： Anran Huang Jingwang Yan hongzhang zhang Xianfeng Li Huamin zhang Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina Dalian National Laboratory for Clean Energy Dalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

By utilizing hard template method to adjust the mesopore length, and alkali activation to generate micro pores, two hierarchical porous carbons (HPCs) were prepared. With controlling of their mesopore length and the activation conditions, the complex system composed by HPCs and electrolyte was simplified and the effect of mesopore length on the performance of HPCs as electrodes in supercapacitors was investigated. It is found that with the mesopore length getting smaller, the ordered area gets smaller and the aggregation occurs, which is caused by the high surface energy of small grains. HPC with long pores (HPCL) exhibits a donut-like morphology with well-defined ordered mesopores and a regular orientation while in HPC with short pores (HPCS), short mesopores are only orderly distributed in small regions. Longer ordered channels form unobstructed ways for ions transport in the particles while shorter channels, only orderly distributed in small areas, results in blocked paths, which may hinder the electrolyte ions transport. Due to the unobstructed structure, HPCL exhibits good rate capability with a capacitance retention rate over 86% as current density increasing from 50 mA/g to 1000 mA/g. The specific capacitance of HPCL derived from the cyclic voltammetry test at 10 mV/s is up to 201.72 F/g, while the specific capacitance of HPCS is only 193.65 F/g. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Supercapacitor Hierarchical porous carbon Ordered mesoporous carbon Hard template

The catalytic effect of bismuth for VO2+/VO2+and V3+/V2+redox couples in vanadium flow batteries

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Journal of Energy Chemistry 2017年第1期26卷 1-7页

作者： Xiaofei Yang Tao Liu Chi Xu hongzhang zhang Xianfeng Li Huamin zhang Division of Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100039China Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) Dalian 116023LiaoningChina

The effect of bismuth (Bi) for both VO2+/VO2+ and V3+/V2+ redox couples in vanadium flow batteries (VFBs) has been investigated by directly introducing Bi on the surface of carbon felt (CF). The results show that Bi has no catalytic effect for VO2+/VO2(+) redox couple. During the first charge process, Bi is oxidized to Bi3+ (never return back to Bi metal in the subsequent cycles) due to the low standard redox potential of 0.308 V (vs. SHE) for Bi3+/Bi redox couple compared with VO2+/VO2+ redox couple and Bi3+ exhibit no (or neglectable) electro-catalytic activity. Additionally, the relationship between Bi loading and electrochemical activity for V3+/V2+ redox couple was studied in detail. 2 wt% Bi-modified carbon felt (2%-BiCF) exhibits the highest electrochemical activity. Using it as negative electrode, a high energy efficiency (EE) of 79.0% can be achieved at a high current density of 160 mA/cm(2), which is 5.5% higher than the pristine one. Moreover, the electrolyte utilization ratio is also increased by more than 30%. Even the cell operated at 140 mA/cm(2) for over 300 cycles, the EE can reach 80.9% without obvious fluctuation and attenuation, suggesting excellent catalytic activity and electrochemical stability in VFBs. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Vanadium flow battery Bismuth Catalysis Electrochemical activity Energy efficiency

Trithiocyanuric acid derived g-C3N4 for anchoring the polysulfide in Li-S batteries application

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Journal of Energy Chemistry 2020年第4期29卷 71-77页

作者： Ziyang Jia hongzhang zhang Ying Yu Yuqing Chen Jingwang Yan Xianfeng Li Huamin zhang Division of Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Dalian 116023LiaoningChina Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) Dalian 116023LiaoningChina

Lithium-sulfur (Li-S) batteries have great potential as an electrochemical energy storage system because of the high theoretical energy density and acceptable cost of financial and environment.However,the shuttle effect leads to severe capacity fading and low coulombic efficiency.Here,graphitic carbon nitride(g-C3N4) is designed and prepared via a feasible and simple method from trithiocyanuric acid (TTCA) to anchor the polysulfides and suppress the shuttle effect.The obtained g-C3N4 exhibits strong chemical interaction with polysulfides due to its high N-doping of 56.87 at%,which is beneficial to improve the cycling stability of Li-S batteries.Moreover,the novel porous framework and high specific surface area of g-C3N4 also provide fast ion transport and broad reaction interface of sulfur cathode,facilitating high capacity output and superior rate performance of Li-S batteries.As a result,Li-S batteries assembled with g-C3N4 can achieve high discharge capacity of 1200 mAh/g at 0.2 C and over 800 mAh/g is remained after 100 cycles with a coulombic efficiency more than 99.5%.When the C-rate rises to 5 C,the reversible capacity of Li-S batteries can still maintain at 607mAh/g.

关键词： Lithium sulfur batteries g-C3N4 Cathode material Polarity interaction Trithiocyanuric acid

New insights into the formation of silicon-oxygen layer on lithium metal anode via in situ reaction with tetraethoxysilane

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Journal of Energy Chemistry 2021年第5期30卷 14-22页

作者： Yang Luo Tianyu Li hongzhang zhang Ying Yu Arshad Hussain Jingwang Yan Huamin zhang Xianfeng Li Division of Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Lithium metal-based secondary batteries are very promising for next generation power battery due to their high energy density.However,lithium anodes suffer from poor electrochemical reversibility in organic electrolytes due to Li dendrites and instability of the solid electrolyte interphase.Recent research demonstrated that the problem can be alleviated via tetraethoxysilane(TEOS)treated lithium metal to form a silicon oxide layer on the lithium surface,however,its reaction mechanism is controversial.Herein,we deeply explore the reaction mechanism between TEOS and Li and propose:Fresh Li can directly react with TEOS even though no lithium hydroxide exists on the lithium surface,and the participation of water will accelerate the reaction process.Moreover,it was found that the silicon oxide layer can promote the uniform deposition of lithium ions by providing lithiophilic nucleation sites,thereby achieving a long cycle life of Li metal batteries.

关键词： Lithium metal anode Silicon-oxygen layer Lithiophilic SEI Tetraethoxysilane

胰管支架置入在预测为重症急性胆源性胰腺炎中的疗效分析

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中华消化内镜杂志 2024年第3期41卷 218-223页

作者：孙敏慧沈红璋张筱凤西湖大学医学院附属杭州市第一人民医院消化内科、杭州市消化疾病研究所、浙江省中西医结合胆胰疾病重点实验室杭州310006

目的探讨胰管支架置入在预测为重症急性胆源性胰腺炎中的疗效。方法回顾性收集2017年1月1日至2021年6月30日就诊于西湖大学医学院附属杭州市第一人民医院消化内科预测为重症急性胆源性胰腺炎,并接受内镜逆行胰胆管造影术(endoscopic ret... 详细信息

目的探讨胰管支架置入在预测为重症急性胆源性胰腺炎中的疗效。方法回顾性收集2017年1月1日至2021年6月30日就诊于西湖大学医学院附属杭州市第一人民医院消化内科预测为重症急性胆源性胰腺炎,并接受内镜逆行胰胆管造影术(endoscopic retrograde cholangiopancreatography,ERCP)治疗的病例。其中,将ERCP术中置入胰管支架的31例病例纳入观察组,于同期病例中选择31例ERCP术中未放置胰管支架的病例纳入对照组。比较两组患者术后1周和2周时炎症指标、肝功能指标和血清淀粉酶水平差异,同时比较两组患者临床改善情况(血清淀粉酶恢复正常时间、腹痛缓解时间、胰周积液好转时间),住院时间和费用以及预后情况(远期并发症发生率、需内镜下引流或内镜下清创率)。结果观察组和对照组患者的年龄、性别构成比、术前急性胰腺炎严重程度评分、肝功能指标、炎症性指标、首次进行ERCP时间差异均无统计学意义(P>0.05)。两组患者接受ERCP术后1周和2周时炎症指标、肝功能指标和血清淀粉酶水平差异均无统计学意义(P>0.05)。观察组和对照组患者血清淀粉酶恢复正常时间分别为3.5(1,5)d和5.0(3,6)d(Z=-2.20,P=0.028),腹痛缓解时间分别为4.0(2.5,7.0)d和5.0(4.0,8.8)d(Z=-3.15,P=0.002),胰周积液好转时间分别为(25.3±1.5)d和(27.8±2.2)d(t=-0.84,P=0.407),住院时间分别为28(19,49)d和40(27,70)d(Z=-2.03,P=0.043),住院总费分别为8.1(5.9,10.9)万元和9.8(6.9,17.3)万元(Z=2.02,P=0.043)。观察组和对照组远期并发症发生率分别为22.6%(7/31)和54.8%(17/31)(χ^(2)=6.80,P=0.009),需内镜引流或清创率分别为16.1%(5/31)和38.7%(12/31)(χ^(2)=3.97,P=0.046)。结论对于预测为重症急性胆源性胰腺炎患者,内镜下解除胆道梗阻的同时放置胰管支架引流胰液降低胰管内压力,不仅可以加快缓解患者的临床症状,还可以有效改善患者的预后。

关键词：胰腺炎胰管支架置入术胰管高压

内镜下双管引流治疗老年患者灌肠所致直肠穿孔1例

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中华老年医学杂志 2024年第3期43卷 388-390页

作者：孙敏慧沈红璋张筱凤浙江大学医学院附属杭州市第一人民医院消化内科杭州310006

灌肠导泻是临床中常见的操作,主要用于便秘、无法自主排便的患者,尤以老年患者居多,其最严重的并发症为肠道穿孔,继发腹腔感染,对于全身状况差的高龄患者而言,治疗手段的选择有限。现报告1例96岁老年患者因灌肠导泻所致直肠穿孔,最终通... 详细信息

灌肠导泻是临床中常见的操作,主要用于便秘、无法自主排便的患者,尤以老年患者居多,其最严重的并发症为肠道穿孔,继发腹腔感染,对于全身状况差的高龄患者而言,治疗手段的选择有限。现报告1例96岁老年患者因灌肠导泻所致直肠穿孔,最终通过内镜下放置双管引流成功治愈的诊治过程,为临床医生提供治疗思路。

关键词：胃肠内窥镜灌肠肠穿孔