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Journal of Energy Chemistry 2023年第1期76卷 631-638,I0015页

作者： zhenkang lin Yuyan Ma Wei Wang Yu He Menghao Wang Jun Tang Cheng Fan Kening Sun Beijing Key Laboratory for Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Artificial solid electrolyte interphase(SEI) is promising to inhibit uncontrollable lithium dendrites and enable long cycling stability for lithium metal batteries. However, the essential mechanical stability is limited since organic layers generally have low modulus whereas intrinsic brittleness for inorganic ones remains a great concern. Polymer-based SEIs with rigid and flexible chains in adequate mechanical properties are supposed to address this issue. Herein, a homogeneous and mechanically stable diffusion layer is achieved by blending rigid chains of polyphenylene sulfone(PPSU) with flexible chains of poly(vinylidene fluoride)(PVDF) in a hybrid membrane, enabling uniform diffusion and stabilizing the lithium metal anode. The Li||Cu cell with the protected electrode exhibits a long lifetime more than 450 cycles(0.5 m A cm^(-2), 1.0 m A h cm^(-2))(fourfold longer than the control group) with higher average Coulombic efficiency of 98.7%. Enhanced performances are also observed at Li||Li and full cell configurations. The improved performances are attributed to the controlled morphology and stable interphase, according to scanning electron microscopy(SEM) and electrochemical impedance. This research advances the idea of uniform lithium plating and provides a new insight on how to create a homogeneous and mechanically stable diffusion layer using rigid-flexible polymers.

关键词： Lithium metal battery Lithium dendrite Uniform diffusion Rigid-flexible artificial layer Electrochemical impedance

A robust interface enabled by electrospun membrane with optimal resistance in lithium metal batteries

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Journal of Energy Chemistry 2021年第4期30卷 1-9页

作者： Chen Dong zhenkang lin Yuxin Yin Yaoxuan Qiao Wei Wang Qibing Wu Chengxiang Yang David Rooney Cheng Fan Kening Sun Beijing Key Laboratory for Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Advanced Chemical Power Sources Guizhou Meiling Power Sources Co.Ltd.Zunyi 563003GuizhouChina School of Chemistry and Chemical Engineering Queen’s University BelfastBelfast BT95AGUnited Kingdom

A uniform diffusion layer is essential for non-dendritic deposition of lithium in high-density lithium ***,natural pristine solid electrolyte interface(SEI)is always porous and inhomogeneous because of repeated breakdown and repair cycles,whereas ideal materials with excellent mechanical property for artificial SEIs remain a ***,a robust and stable interface is achieved by spinning soft polymer associated with few MoO_(3) into fibers,and thus mechanical property of fibers other than materials determines mechanical performance of the interface which can be optimized by adjusting ***,lithium deposited underneath the layer is enabled by constructing an optimal resistance to make the membrane serve as an artificial SEI rather than lithium *** a result,dendritefree lithium was observed underneath the membrane,and stable interface for long-term cycling was also indicated by EIS *** lithium iron phosphate(LiFePO_(4))full-cell with coated electrode demonstrated an initial capacity of 155.2 m Ah g^(-1),and 80%of its original capacity was retained after 500 cycles at 2.0℃ without any additive in carbonate-based electrolyte.

关键词： Lithium metal battery Dendrite-free Interfacial stability Uniform diffusion layer Deposition site

Unraveling the Fundamental Mechanism of Interface Conductive Network Influence on the Fast‑Charging Performance of SiO‑Based Anode for Lithium‑Ion Batteries

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Nano-Micro Letters 2024年第3期16卷 53-68页

作者： Ruirui Zhang Zhexi Xiao zhenkang lin Xinghao Yan Ziying He Hairong Jiang Zhou Yang Xilai Jia Fei Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China Beijing Key Laboratory of Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China Institute of Polymer Science and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China

Progress in the fast charging of high-capacity silicon monoxide(SiO)-based anode is currently hindered by insufficient conductivity and notable volume *** construction of an interface conductive network effectively addresses the aforementioned problems;however,the impact of its quality on lithium-ion transfer and structure durability is yet to be ***,the influence of an interface conductive network on ionic transport and mechanical stability under fast charging is explored for the first time.2D modeling simulation and Cryo-transmission electron microscopy precisely reveal the mitigation of interface polarization owing to a higher fraction of conductive inorganic species formation in bilayer solid electrolyte interphase is mainly responsible for a linear decrease in ionic diffusion energy ***,atomic force microscopy and Raman shift exhibit substantial stress dissipation generated by a complete conductive network,which is critical to the linear reduction of electrode residual *** study provides insights into the rational design of optimized interface SiO-based anodes with reinforced fast-charging performance.

关键词： Fast charging SiO anode Interface conductive network Ionic transport Mechanical stability

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电池系统的故障特征以及多故障的诊断与识别

化工学报 2022年第8期73卷 3394-3405页

作者：杨静林振康汤君樊铖孙克宁北京理工大学化学与化工学院北京100081

高比能的锂电池系统广泛应用于储能与动力电源,电池系统的故障诊断技术是其安全、长效工作的重要保障。但锂电池化学性质特殊,故障类型难以识别,增加了电池系统的安全风险。为提高故障诊断与类型识别的准确性,提高电池系统安全性,需要... 详细信息

高比能的锂电池系统广泛应用于储能与动力电源,电池系统的故障诊断技术是其安全、长效工作的重要保障。但锂电池化学性质特殊,故障类型难以识别,增加了电池系统的安全风险。为提高故障诊断与类型识别的准确性,提高电池系统安全性,需要认识发生不同故障时的电、热、化学特征。综述了电池系统的故障类型,并系统地总结和分析了电池系统单电池、连接、传感器等故障的电、热、化学信号特征。提出了内部电化学参数是可靠判别传感器故障与各种电池早期故障的关键特征,电化学阻抗谱是获取内部特征参数的有效方法;从电压波动性出发,电流与电压相关系数是判别传感器故障与连接故障的关键;此外,电池系统的特殊连接结构也是区分不同故障的重要手段。

关键词：电池系统故障特征多故障诊断参数估计瞬态响应预测

同方期刊数据库博看期刊评论

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基于非线性动力学的锂沉积形貌模拟与预测

化工学报 2020年第9期71卷 4228-4237页

作者：林振康乔耀璇王伟袁洪樊铖孙克宁北京理工大学化学与化工学院北京100081 北京理工大学前沿交叉科学研究院北京100081 清华大学化学工程系北京100084

金属锂具有极高的理论能量密度,是新一代锂电池中最有潜力的负极材料之一。金属锂沉积时容易形成枝晶,极大影响了锂金属电池的安全性与使用寿命。但由于金属锂性质活泼,缺乏锂电极/电解液界面原位表征方法,锂枝晶生长机制尚不明确。通... 详细信息

金属锂具有极高的理论能量密度,是新一代锂电池中最有潜力的负极材料之一。金属锂沉积时容易形成枝晶,极大影响了锂金属电池的安全性与使用寿命。但由于金属锂性质活泼,缺乏锂电极/电解液界面原位表征方法,锂枝晶生长机制尚不明确。通过有限元方法,基于非线性电极过程动力学,以三次电流模型定量研究了电极/电解液界面行为,并分析不同过程参数对表面电流的影响。结果表明,电极/电解质界面的浓度、电场差异是枝晶生长的主要原因,更大的扩散系数有利于提高界面浓度均匀性,更小的交换电流密度有利于减弱界面反应的敏感性。存在电化学极化区间是均匀沉积的必要条件,电化学极化区间越宽,均匀沉积操作窗口越宽。通过极化曲线可以判断体系是否具有均匀沉积的倾向。加深了对锂电极/电解液界面的电沉积过程的理解,对锂负极保护研究具有指导性意义。

关键词：锂金属电池电化学动力学数值模拟锂枝晶

High electrocaloric cooling power of relaxor ferroelectric BaZr_xTi_(1–x)O_3 ceramics within broad temperature range

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Science Bulletin 2018年第6期63卷 356-361页

作者： Jianfeng Qian Penghao Hu Chen Liu Jianyong Jiang zhenkang Dan Jing Ma Yuanhua lin Ce-Wen Nan Yang Shen School of Materials Science and Engineering and State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Institute for Advanced Materials and Technology University of Science & Technology Beijing

Electrocaloric effect （ECE） is much promising to realize high efficiency and environment friendly solution in solid cooling devices. Relaxor ferroelectrics are good candidates for the materials with high elec-trocaloric cooling power. In this paper, relaxor ferroelectric Ba（ZrxTil_x）O3 （BZT, x = 0.2, 0.21, 0.22, 0.23） ceramics were prepared with their temperature change （AT） induced by the ECE and electrocaloric strength （AT/E） measured within broad temperature range. It is found that the BZT21 （x = 0.21) exhibits the largest ATof-4.67 K and a high AT/E value of-0.46 km/MV at 9.9 MV/m and 25℃. BZT21 also exhi-bits apparent relaxor ferroelectric response, showing a very broad EC peak in the temperature interval between 15℃ and 50℃. Moreover, the relationship between EC properties and relaxor features was analyzed by piezoresponse force microscopy test. The results reveal that more dispersed phase structures induce additional configurational entropy, which is in favor for the enhanced EC performance. The inter-play and compromise between the kinetic and thermodynamic mechanisms of domain switching deter-mines the optimal composition for the EC performances of the BZT ceramics.

关键词： Electrocaloric effectRelaxor ferroelectricsPiezoresponse force microscopy Domain structure

清香型乌龙茶品质形成中游离氨基酸指纹图谱变化规律

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农业工程学报 2012年第17期28卷 244-252,F0003页

作者：陈林陈键张应根邬龄盛王振康杨卫尤志明福建省农业科学院茶叶研究所福安355015 安徽农业大学茶叶生物化学与生物技术重点实验室合肥230036

为探明游离氨基酸在茶树新梢生育过程的代谢变化及清香型乌龙茶制作工艺对其指纹图谱化学模式的影响,分别以铁观音、黄棪、金观音和黄观音品种春茶新梢为供试材料,对其新梢生育及乌龙茶制作过程中的游离氨基酸进行高效液相色谱-AQC(6-... 详细信息

为探明游离氨基酸在茶树新梢生育过程的代谢变化及清香型乌龙茶制作工艺对其指纹图谱化学模式的影响,分别以铁观音、黄棪、金观音和黄观音品种春茶新梢为供试材料,对其新梢生育及乌龙茶制作过程中的游离氨基酸进行高效液相色谱-AQC(6-氨基喹啉基-N-羟基琥珀酰亚氨基甲酸酯)柱前衍生化检测分析。结果表明,18种已标定游离氨基酸指纹峰面积经标准化(尤其是自然对数变换)数据预处理后,再进行相似度分析(夹角余弦)、聚类分析法(欧氏距离-近邻法)和主成分分析,均可获得较为一致的可视化模式识别结果。4个茶树品种可划分为铁观音和黄棪、金观音和黄观音2个类群,不同生育期芽叶与清香型乌龙茶在制品可进行较好区分。茶氨酸、甘氨酸、谷氨酸等8种主要游离氨基酸在茶树新梢生育过程中发生较为明显的增减变化,且在中、小开面2～4叶中的含量相对较低;在清香型乌龙茶制作过程中,各主要游离氨基酸含量发生小幅变化,毛茶成品中略有增加。由此可见,游离氨基酸在茶树新梢生育过程中含量及组成的动态变化较清香型乌龙茶制作工艺的影响更为明显。该研究结果可为清香型乌龙茶鲜叶原料选取和品质工艺控制提供参考。

关键词：氨基酸模式识别主成分分析乌龙茶指纹图谱

一种基于Hopfield神经网络的伪Gray编码方法

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通信学报 1999年第S1期20卷 323-326页

作者：林嘉宇杨卫平沈振康国防科技大学电子科学与工程学院长沙410073

伪Gray编码属信源—信道联合编码!可提供矢量量化器以零冗余的信道误码保护。本文运用Hopfield神经网络,构造适当能量函数,以求得伪Gray编码的次最优解;该Hopfield神经网络具有较简洁的形式,稍作修改,可求解简化信道模型下的伪Gray编码... 详细信息

伪Gray编码属信源—信道联合编码!可提供矢量量化器以零冗余的信道误码保护。本文运用Hopfield神经网络,构造适当能量函数,以求得伪Gray编码的次最优解;该Hopfield神经网络具有较简洁的形式,稍作修改,可求解简化信道模型下的伪Gray编码,且不要求知道信道的确切特性参数。仿真实验表明,本方法可以得到较好的结果。

关键词：信源—信道联合编码伪Gray编码 Hopfield神经网络

LA-ICP-MS Zircon U-Pb Geochronology and Petrology of the Muchang Alkali Granite,zhenkang County,Western Yunnan Province,China

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Acta Geologica Sinica(English Edition) 2010年第6期84卷 1488-1499页

作者： YE lin GAO Wei CHENG Zengtao YANG Yulong TAO Yan State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

The Muchang composite intrusion is located about 14 km southeast of the Fengwei town and south of the Baoshan-zhenkang *** rift-related intrusion consists of the early-stage riebeckite nordmarkite in the east and west sides and the discontinuous marginal zone,the late-stage main body of dominant riebeckite granite,and minor aegirine *** on petrological geochemistry and LA-ICP-MS zircon U-Pb dating of the late-stage riebeckite granite,origin and evolution of the Muchang alkali granite and the relationship between the granite and the associated skarn-type Luziyuan Pb-Zn deposit are discussed in this *** results show that the Muchang alkali granites belong to A-type granites,which are characterized by enrichment in Al_2O_3,SiO_2,total alkali and Fe, depletion in MgO and CaO contents with high FeO_T/MgO *** REE concentrations are relatively high,exhibiting highly fractionated LREE patterns with significantly Eu negative anomaly. The Muchang granites are obviously enriched in lithophile elements（e.g.,Rb,K,U and Th） and high field strength elements（e.g.,Zr,Hf,Nb,Y and Ga） with high 10000×Ga/Al ratios and depleted in Sr, Ba,Ti,Cr and Ni,which are similar to those of the A-type granites and quite different from those of S-type andⅠ-type *** LA-ICP-MS zircon dating results of the Muchang granite gave a weighted mean age of 266.2±5.4 Ma（2σ）,suggesting that they were formed in the stage of extension at the end of post-collision at Middle Permian and the consumption of Paleo-Tethys ocean took place before 266 Ma. It is suggested that the unexposed intermediate-acid intrusive rocks in the Luziyuan ore district,which is the ＂sister＂ rocks material of the Muchang granites and related closely to Luziyuan Pb-Zn mineralization,were the product of Middle Permian.

关键词： A-type granite U-Pb age Muchang alkali granite tectonic setting evolution of Tethys in southern Sanjiang area

语音信号相空间重构中时间延迟的选择──复自相关法

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信号处理 1999年第3期15卷 220-225页

作者：林嘉宇王跃科黄芝平沈振康国防科技大学

时间序列空间重构中，时间延迟参数的选择具有重要意义。本文在分析求时间延迟的自相关法和平均位移法基础上，推导出较好的求时间延迟的方法，即复自相关法。复自相关法具有强的理论依据，其计算复杂度不大，对数据长度的依赖性不强，... 详细信息

时间序列空间重构中，时间延迟参数的选择具有重要意义。本文在分析求时间延迟的自相关法和平均位移法基础上，推导出较好的求时间延迟的方法，即复自相关法。复自相关法具有强的理论依据，其计算复杂度不大，对数据长度的依赖性不强，具有优秀的抗噪能力。应用于语音信号相空间重构的实验表明，其度量可得到合适的时间延迟。

关键词：语音信号混沌相空间重构时间延迟复自相关法