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Evolutionary mechanism and frequency response of graphite electrode at extreme temperatures

Nano Research 2024年第8期17卷 7283-7289页

作者： Shanpeng Pei Zhiyong Zhang Xiuli Zhang Yan Liu Xiang Han linshan luo Pengfei Su Chaofei Lan Wei Huang Ziqi Zhang Ming-Sheng Wang Songyan Chen Department of Physics Xiamen UniversityXiamen 361005China Shandong Electric Power Engineering Consulting Institute Corporation Jinan 250031China State Key Lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China School of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China National Key Laboratory of Integrated Circuits and Microsystems Chongqing 400000China

The battery management system is employed to monitor the external temperature of the lithium-ion battery in order to detect any potential ***,this outside–in detection method often suffers from a lag and is therefore unable to accurately predict the battery’s real-time ***,an inside–out frequency response approach is used to accurately monitor the battery’s state at various temperatures in real-time and correlate it with the solid electrolyte interphase(SEI)evolution of the graphite *** SEI evolution at temperatures of−15,25,60,and 90℃exhibits certain regular characteristics with temperature *** a temperature of−15℃,the Li^(+)-solvent interaction of lithium-ion slowed down,resulting in a significant reduction in *** 25℃,a LiF-rich inorganic SEI was identified as forming,which facilitated lithium-ion ***,high temperatures would induce decomposition of lithium hexafluorophosphate(LiPF_(6))and lithium-ion *** the extreme temperature of 90℃,the SEI would be organic-rich,and Li_(x)P_(y)F_(z),a decomposition product of lithium salts,was further oxidized to Li_(x)PO_(y)F_(z),which led to a surge in the charge-transfer resistance at SEI(R_(sei))and a reduction in Coulombic efficiency(CE).This changing relationship can be recorded in real time from the inside out by electrochemical impedance spectroscopy(EIS)*** provides a new theoretical basis for the structural evolution of lithium-ion batteries and the regular characterization of EIS.

关键词： graphite electrode solid electrolyte interphase(SEI)film extreme temperatures frequency response evolutionary mechanism

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Cu nanowire array with designed interphases enabling high performance Si anode toward flexible lithium-ion battery

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Nano Research 2024年第3期17卷 1516-1524页

作者： Pengfei Su Ziqi Zhang linshan luo Zhiyong Zhang Chaofei Lan Yahui Li Shaowen Xu Shanpeng Pei Guangyang Lin Cheng Li Xiang Han Wei Huang Songyan Chen Fujian Provincial Key Laboratory of Semiconductors and Applications Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesDepartment of PhysicsXiamen UniversityXiamen 361005China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Science and Technology on Analog Integrated Circuit Laboratory Chongqing 400060China Shandong Electric Power Engineering Consulting Institute Co. Ltd.Jinan 250013China

To meet the growing demand for wearable smart electronic devices,the development of flexible lithium-ion batteries(LIBs)is *** is an ideal candidate for the anode material of flexible lithium-ion batteries due to its high specific capacity,low working potential,and earth *** largest challenge in developing a flexible silicon anode is how to maintain structural integrity and ensure stable electrochemical reactions during external *** this work,we propose a novel design for fabricating core–shell electrodes based on a copper nanowire(CuNW)array core and magnetron sputtered Si/C *** nanowire array structure has characteristics of bending under longitudinal stress and twisting under transverse stress,which helps to maintain the mechanical stability of the structure during electrode bending and *** low-temperature annealing generates a small amount of Cu3Si alloy,which enhances the connection strength between Si and the conductive network and solves the poor conductivity problem of Si,which is known as a semiconductor *** unique configuration design of CuNW@Si@C-400℃ leads to stable long cycle performance of 1109 mAh∙g^(-1) after 1000 cycles and excellent rate performance of 500 mAh∙g^(-1) at a current density of 10 A∙g^(-1).Furthermore,the CuNW@Si@C-400℃||LiFePO_(4)(LFP)full battery demonstrates excellent flexibility,with a capacity retention of more than 96%after 100 *** study provides a promising strategy for the development of flexible lithium-ion batteries.

关键词： flexible lithium-ion battery silicon anode magnetron sputtering core–shell electrode Cu nanowire array

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Enabling structural and interfacial stability of 5 V spinel LiNi0.5Mn1.5O4 cathode by a coherent interface

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Journal of Energy Chemistry 2023年第1期76卷 266-276,I0007页

作者： Min Xu Ming Yang Minfeng Chen Lanhui Gu linshan luo Songyan Chen Jizhang Chen Bo Liu Xiang Han College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037JiangsuChina College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina College of Mathematics and Physics Jingangshan UniversityJi'an 343009JiangxiChina Department of Physics Jiujiang Research Institute Xiamen UniversityXiamen 361005FujianChina

Spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO),a 5 V class high voltage cathode,has been regarded as an attractive candidate to further improve the energy density of lithium-ion *** issue simultaneously enabling side stability and maintaining high interfacial kinetics,however,has not yet been ***,we design a coherent Li_(1.3)A_(l0.3)Ti_(1.7)(PO)_(4)(LATP)layer that is crystally connected to the spinel LNMO host lattices,which offers fast lithium ions transportation as well as enhances the mechanical stability that prevents the particle ***,the inactive Li_(3)BO_(3)(LBO)coating layer inhibits the corrosion of transition metals and continuous side ***,the coherent-engineered LNMO-LATPLBO cathode material exhibits superior electrochemical cycling stability in a window of 3.0–5.0 V,for example a high-capacity retention that is 89.7%after 500 cycles at 200 m A g-1obtained and enhanced rate performance(85.1 m A h g^(-1)at 800 m A g^(-1))when tested with a LiPF6-based carbonate *** work presents a new approach of engineering 5 V class spinel oxide cathode that combines interfacial coherent crystal lattice design and surface coating.

关键词： Lithium-ion battery Spinel cathode LATP Coherent interface

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Liquid-phase sintering enabling mixed ionic-electronic interphases and free-standing composite cathode architecture toward high energy solid-state battery

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Nano Research 2022年第7期15卷 6156-6167页

作者： Xiang Han Weijun Zhou Minfeng Chen linshan luo Lanhui Gu Qiaobao Zhang Jizhang Chen Bo Liu Songyan Chen Wenqing Zhang College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Department of Physics Xiamen UniversityXiamen 361005China College of Mathematics and Physics Jinggangshan UniversityJi’an 343009China Department of Materials Science and Engineering College of MaterialsXiamen 361005China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Solid-state batteries(SSBs)will potentially offer increased energy density and,more importantly,improved safety for next generation lithium-ion(Li-ion)*** enabling technology is solid-state composite cathodes with high operating voltage and area *** composite cathode manufacturing technologies,however,suffer from large interfacial resistance and low active mass loading that with excessive amounts of polymer electrolytes and conductive ***,we report a liquidphase sintering technology that offers mixed ionic-electronic interphases and free-standing electrode architecture design,which eventually contribute to high area capacity.A small amount(~4 wt.%)of lithium hydroxide(LiOH)and boric acid(H_(3)BO_(3))with low melting point are utilized as sintering additives that infiltrate into single-crystal Ni-rich LiNi_(0.8)Mn_(0.1)Co_(0.1)(NMC811)particles at a moderately elevated temperature(~350℃)in a liquid state,which not only enable intimate physical contact but also promote the densification *** addition,the liquid-phase additives react and transform to ionic-conductive lithium boron oxide,together with the indium tin oxide(ITO)nanoparticle coating,mixed ionic-electronic interphases of composite cathode are successfully ***,the liquid-phase sintering performed at high-temperature(~800℃)also enables the fabrication of highly dense and thick composite cathodes with a novel free-standing *** promising performance characteristics of such composite cathodes,for example,delivering an area capacity above 8 mAh·cm^(−2) within a wide voltage window up to 4.4 V,open new opportunities for SSBs with a high energy density of 500 Wh·kg^(−1) for safer portable electronic and electrical transport.

关键词： solid-state battery single-crystal Ni-rich LiNi_(0.8)Mn_(0.1)Co_(0.1) liquid-phase sintering mixed ionic-electronic interphases freestanding architecture

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Interfacial nitrogen engineering of robust silicon/MXene anode toward high energy solid-state lithium-ion batteries

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Journal of Energy Chemistry 2022年第4期31卷 727-735页

作者： Xiang Han Weijun Zhou Minfeng Chen Jizhang Chen Guanwen Wang Bo Liu linshan luo Songyan Chen Qiaobao Zhang Siqi Shi Ching-Ping Wong College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037JiangsuChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaUSA College of Mathematics and Physics Jinggangshan UniversityJi'an 343009JiangxiChina Department of Physics Jiujiang Research Institute and Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesXiamen UniversityXiamen 361005FujianChina Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

Replacing the conventional carbonate electrolyte by solid-state electrolyte (SSE) will offer improved safety for lithium-ion *** further improve the energy density,Silicon (Si) is attractive for next generation solid-state battery (SSB) because of its high specific capacity and low *** energy density and safe Si-based SSB,however,is plagued by large volume change that leads to poor mechanical stability and slow lithium ions transportation at the multiple interfaces between Si and ***,we designed a self-integrated and monolithic Si/two dimensional layered T_(3)C_(2)T_(x)(MXene,T_(x) stands for terminal functional groups) electrode architecture with interfacial nitrogen *** a heat treatment process,the polyacrylonitrile not only converts into amorphous carbon (a-C) that shells Si but also forms robust interfacial nitrogen chemical bonds that anchors Si and *** repeated lithiation and delithiation processes,the robust interfacial engineered Si/MXene configuration enhances the mechanical adhesion between Si and MXene that improves the structure stability but also contributes to form stable solid-electrolyte interphase (SEI).In addition,the N-MXene provides fast lithium ions transportation ***,the Si/MXene with interfacial nitrogen engineering (denoted as Si-N-MXene) deliveres high-rate performance with a specific capacity of 1498 m Ah g^(-1) at a high current of 6.4 A g^(-1).A Si-N-MXene/NMC full cell exhibited a capacity retention of 80.5%after 200 *** Si-N-MXene electrode is also applied to SSB and shows a relative stable cycling over 100 cycles,demonstrating the versatility of this concept.

关键词： Solid-state lithium-ion battery Monolithic Si/MXene anode Interfacial nitrogen engineering Lithium ions transportation

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耳穴压豆、针灸联合脐疗治疗不完全性肠梗阻临床研究

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中医学报 2024年第7期39卷 1572-1576页

作者：张威罗林山刘一灿宋敬锋刘泉巩跃生郑州市大肠肛门病医院/河南省中医消化病医院河南郑州450004

目的:观察耳穴压豆、针灸联合脐疗治疗不完全性肠梗阻的临床疗效。方法:68例不完全性肠梗阻患者随机分对照组和治疗组各34例。对照组给予常规治疗;治疗组在对照组治疗基础上给予耳穴压豆(取交感、大肠、小肠穴,用王不留行籽固定在穴位上... 详细信息

目的:观察耳穴压豆、针灸联合脐疗治疗不完全性肠梗阻的临床疗效。方法:68例不完全性肠梗阻患者随机分对照组和治疗组各34例。对照组给予常规治疗;治疗组在对照组治疗基础上给予耳穴压豆(取交感、大肠、小肠穴,用王不留行籽固定在穴位上,间断指压,左右耳交替进行,每日左右耳各1次,共5 d)、针灸(取天枢、大横、足三里,针刺按虚补实泻法操作,共5 d)及脐疗(生大黄、芒硝、吴茱萸、生姜、葱白共研末,以蜂蜜调制,装入脐贴壳,贴敷于患者脐部神阙穴紧贴皮肤,每次2 h,每日2次,共5 d)。治疗后,比较两组患者临床疗效、主要症状积分、消化功能、血清胃泌素水平。结果:(1)治疗组有效率为93.1%(31/33),治愈率为69.7%(23/33);对照组有效率为78.1%(25/32),治愈率为50.0%(16/32),两组有效率和治愈率比较,差异均有统计学意义(P<0.05)。(2)治疗后,两组患者主要症状积分均低于本组治疗前;治疗组主要症状积分为(16.43±1.44)分,对照组主要症状积分为(28.32±0.79)分,治疗组低于同期对照组(P<0.05)。(3)治疗后,治疗组恢复排气时间为(80.56±11.34)h、恢复排便时间为(99.43±16.22)h、胃管拔除时间为(113.91±10.23)h、饮食恢复时间为(124.18±10.33)h、住院时间为(8.18±0.24)d,均低于同期对照组(P<0.05)。(4)治疗后,两组患者血清胃泌素水平均高于本组治疗前;治疗组血清胃泌素水平为(87.83±1.56)ng·L^(-1),对照组血清胃泌素水平为(73.32±0.29)ng·L^(-1),治疗组高于同期对照组(P<0.05)。结论:耳穴压豆、针灸联合脐疗治疗不完全性肠梗阻疗效显著,能有效促进消化功能恢复,缩短住院时间,提高血清胃泌素水平。

关键词：不完全性肠梗阻耳穴压豆针灸脐疗

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Tuning the electron transport behavior at Li/LATP interface for enhanced cyclability of solid-state Li batteries

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Nano Research 2023年第1期16卷 1634-1641页

作者： linshan luo Feng Zheng Haowen Gao Chaofei Lan Zhefei Sun Wei Huang Xiang Han Ziqi Zhang Pengfei Su Peng Wang Shengshi Guo Guangyang Lin Jianfang Xu Jianyuan Wang Jun Li Cheng Li Qiaobao Zhang Shunqing Wu Ming-Sheng Wang Songyan Chen Department of Physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesKey Laboratory of Low Dimensional Condensed Matter Physics(Department of Education of Fujian Province)Jiujiang Research InstituteXiamen UniversityXiamen 361005China State Key Lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Western Digital Corporation 951 Sandisk DrMilpitasCA 95035USA

An interlayer is usually employed to tackle the interfacial instability issue between solid electrolytes(SEs)and Li metal caused by the side ***,the failure mechanism of the ionic conductor interlayers,especially the influence from electron penetration,remains largely ***,using Li1.3Al0.3Ti1.7(PO4)3(LATP)as the model SE and LiF as the interlayer,we use metal semiconductor contact barrier theory to reveal the failure origin of Li/LiF@LATP interface based on the calculation results of density functional theory(DFT),in which electrons can easily tunnel through the LiF grain boundary with F vacancies due to its narrow barrier width against electron injection,followed by the reduction of ***,an Al-LiF bilayer between Li/LATP is found to dramatically promote the interfacial stability,due to the highly increased barrier width and homogenized electric field at the ***,the Li symmetric cells with Al-LiF bilayer can exhibit excellent cyclability of more than 2,000 h superior to that interlayered by LiF monolayer(~860 h).Moreover,the Li/Al-LiF@LATP/LiFePO4 solid-state batteries deliver a capacity retention of 83.2%after 350 cycles at 0.5 *** findings emphasize the importance of tuning the electron transport behavior by optimizing the potential barrier for the interface design in high-performance solid-state batteries.

关键词： solid-state electrolyte Li metal LiF Al electron transport interfacial barrier

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基于A-λ混合单元法的静磁场数值求解

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电工技术学报 2018年第5期33卷 1167-1176页

作者：江鹏李敬张群罗林山关振群工业装备结构分析国家重点实验室(大连理工大学工程力学系) 大连116024 英特工程仿真技术(大连)有限公司大连116023 安徽送变电工程公司合肥230001

提出采用混合单元法解决静磁场有限元计算中的伪解问题。针对静磁场磁矢势方程,基于约束变分原理,引入Lagrange标量乘子施加Coulomb规范,得到A-λ混合列式,并进一步地识别出Lagrange乘子的梯度为激励电流的不协调部分。基于Newton-Raph... 详细信息

提出采用混合单元法解决静磁场有限元计算中的伪解问题。针对静磁场磁矢势方程,基于约束变分原理,引入Lagrange标量乘子施加Coulomb规范,得到A-λ混合列式,并进一步地识别出Lagrange乘子的梯度为激励电流的不协调部分。基于Newton-Raphson法,对材料非线性问题建立相应的迭代解法。混合单元中的磁矢势A采用棱边元离散,Lagrange乘子λ采用节点元离散。对混合单元法离散得到的鞍点问题,可以通过增广Lagrange乘子技术,将其转换为一个等价问题,并采用Uzawa法进行迭代求解。与传统的节点元和棱边元相比,混合单元可以有效地消除伪解,获得较高的数值精度。

关键词：静磁学混合有限元法 Coulomb规范 Lagrange乘子法 Uzawa法

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均匀化处理对Mg-Nd-Zn-Zr合金组织及力学性能的影响

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金属热处理 2020年第5期45卷 147-152页

作者：苏再军朱文杨树忠罗林山邵阳学院机械与能源工程学院湖南邵阳422000 邵阳学院高效动力系统智能制造湖南省重点实验室湖南邵阳422000 湖南工业大学机械工程学院湖南株洲412007 赣州有色冶金研究所江西赣州341000

通过光学显微镜(OM)、差热分析(DTA)、X射线衍射分析(XRD)、扫描电镜(SEM)及拉伸试验等方法,研究了均匀化处理对Mg-2. 3Nd-0. 5Zn-0. 5Zr合金组织及力学性能的影响。结果表明:铸态合金主要由α-Mg、条状Mg12Nd相及花瓣状Zn-Zr相组成。... 详细信息

通过光学显微镜(OM)、差热分析(DTA)、X射线衍射分析(XRD)、扫描电镜(SEM)及拉伸试验等方法,研究了均匀化处理对Mg-2. 3Nd-0. 5Zn-0. 5Zr合金组织及力学性能的影响。结果表明:铸态合金主要由α-Mg、条状Mg12Nd相及花瓣状Zn-Zr相组成。经均匀化处理后,条状Mg12Nd相逐渐溶入基体,晶内还存有部分花瓣状Zn-Zr相,合金最佳的均匀化处理工艺为505℃×6 h。经最佳均匀化处理后,晶界第二相溶入基体消除了裂纹源,伸长率提高了100%,合金断裂模式由铸态的脆性解理断裂转变为延性穿晶断裂,但第二相强化及细晶强化效果的弱化抵消了固溶强化作用,合金的抗拉强度、屈服强度略有提高。

关键词： Mg-Nd-Zn-Zr合金均匀化显微组织力学性能

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熔盐法可控合成球形CeO_2的研究

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中国稀土学报 2017年第5期35卷 579-583页

作者：王玉香文小强周健郭春平袁德林罗林山赣州有色冶金研究所江西赣州341000

以NaCl-KCl为熔盐,采用熔盐法制备了球形CeO_2纳米粉。在实验过程中,通过改变NaCl-KCl与Ce之间的比例、煅烧温度、煅烧时间等工艺参数,考察了熔盐法制备工艺参数对CeO_2粉末的形貌、颗粒尺寸和分散性的影响,以此实现了球形CeO_2的可控... 详细信息

以NaCl-KCl为熔盐,采用熔盐法制备了球形CeO_2纳米粉。在实验过程中,通过改变NaCl-KCl与Ce之间的比例、煅烧温度、煅烧时间等工艺参数,考察了熔盐法制备工艺参数对CeO_2粉末的形貌、颗粒尺寸和分散性的影响,以此实现了球形CeO_2的可控合成。通过SEM,XRD和激光粒度分析仪等测试方法对其颗粒形貌、分散性、物相、粒径等性能进行了表征。结果表明:通过控制制备条件,可以获得分散性良好、结晶完整的不同粒径的球形CeO_2纳米粉。当NaCl-KCl与Ce比为3∶1,煅烧温度为800℃,保温2 h时,获得的CeO_2纳米粉粒径约为85 nm。

关键词：熔盐法球形CeO2 可控合成 NaCl-KCl 团聚稀土

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