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Interfacial/bulk synergetic effects accelerating charge transferring for advanced lithium-ion capacitors

Chinese Chemical Letters 2024年第6期35卷 168-175页

作者： Chang Liu Zirui Song Xinglan deng Shihong Xu Renji Zheng wentao deng Hongshuai Hou Guoqiang Zou Xiaobo Ji School of Chemistry and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China

The exploration of advanced materials through rational structure/phase design is the key to develop highperformance lithium-ion capacitors(LICs).However,high complexity of material preparation and difficulty in quantity production largely hinder the further ***,Cu_(5)FeS_(4-x)/C(CFS@C)heterojunction with rich sulfur vacancies has successfully achieved from natural bornite,presenting low costeffective and bulk-production *** functional theory(DFT)calculations indicate that rich vacancies in bulk phase can decrease band gap of bornite and thus improve its intrinsic electron conductivity,as well as the heterojunction spontaneously evokes a built-in electric field between its interfacial region,largely reducing the migration barrier from 1.27 e V to 0.75 e *** from these merits,the CFS@C electrodes deliver outperformed lithium storage performance,e.g.,high reversible capacity(822.4m Ah/g at 0.1 A/g),excellent cycling stability(up to 820 cycles at 2 A/g and 540 cycles at 5 A/g with respective capacity retention of over or nearly 100%).With CFS@C as anode and porous carbon nanosheets(PCS)as cathode,the assembled CFS@C//PCS LIC full cells exhibit high energy/power density characteristics of 139.2 Wh/kg at 2500 W/*** work is expected to offer significant insights into structure modifications/devising toward natural minerals for advanced energy-storage systems.

关键词： Bulk/interfacial modification Heterostructure Sulfur vacancies Lithium ion capacitors Capacitors

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基于EM算法的高斯混合模型的织物组织点自动识别

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现代纺织技术 2024年第2期32卷 63-69页

作者：刘威于玲王畅巍邓文韬邓中民武汉纺织大学纺织科学与工程学院武汉430200 武汉纺织大学湖北省纺织新材料与先进加工技术省部共建国家重点实验室武汉430200

针对现有无监督学习识别机织物组织点的准确率相对较低和不稳定的问题,研究基于EM算法的高斯混合模型对机织物组织点的识别方法。首先对采集的不同织物图像进行预处理及图像矫正,以提高后续的组织点的分割效率;接着利用改进的灰度投影... 详细信息

针对现有无监督学习识别机织物组织点的准确率相对较低和不稳定的问题,研究基于EM算法的高斯混合模型对机织物组织点的识别方法。首先对采集的不同织物图像进行预处理及图像矫正,以提高后续的组织点的分割效率;接着利用改进的灰度投影法进行织物组织点定位,并提取组织点的灰度共生矩作为纹理特征,通过主成分分析对纹理特征进行降维处理;最后采用2种常见无监督学习与文章所用的识别方法做实验比较,并采用4种评估指标进行评估,得到评估结果。通过计算4种评估指标平均值和标准差进行比较,文章所用识别方法的评估参数平均值都要比其余两种识别算法高。文章所用识别方法能对织物组织点进行自动识别,并且识别的准确率相比于其余两种识别算法得到了有效地提升。

关键词：组织点分割自动识别 K-mean聚类模糊C均值算法高斯混合模型

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基于图像处理的纱线条干均匀度检测

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纺织工程学报 2024年第4期2卷 61-68页

作者：王畅巍柯薇刘威邓文韬武汉纺织大学纺织科学与工程学院武汉430200 武汉纺织大学湖北省纺织新材料与先进加工技术省部共建国家重点实验室武汉430200

针对图像处理在纱线条干均匀度检测中出现的纱线图像在采集时发生光照不均以及倾斜会影响最终结果的问题,研究基于同态滤波以及Hough变换对纱线条干均匀度进行检测的方法。首先对光照不均现象用同态滤波方法将图像光照分量和反射分量分... 详细信息

针对图像处理在纱线条干均匀度检测中出现的纱线图像在采集时发生光照不均以及倾斜会影响最终结果的问题,研究基于同态滤波以及Hough变换对纱线条干均匀度进行检测的方法。首先对光照不均现象用同态滤波方法将图像光照分量和反射分量分离开,对光照分量加以抑制来突出反射分量,从而消除光照不均现象,突出条干部分;其次对图像中倾斜纱线用Hough变换检测倾斜角度加以旋转校正至水平状态;最后对无噪声信号纱线图像进行图像分割提取纱线主干部分从而来计算采集到纱线的平均直径。实验表明,通过计算图像处理得到的纱线条干CV值与现有条干仪检测结果对比偏差小于4%,验证了图像处理方法的准确性,对未来形成成套的视觉检测系统有参考意义。

关键词：光照不均纱线倾斜条干均匀度直径提取 CV值

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2D Metal-Organic Frameworks for Electrochemical Energy Storage

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Energy & Environmental Materials 2023年第6期6卷 33-49页

作者： dengyi Xiong Xinglan deng Ziwei Cao Shusheng Tao Zirui Song Xuhuan Xiao wentao deng Hongshuai Hou Guoqiang Zou Xiaobo Ji College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Metal-organic frameworks(MOFs)have been widely adopted in various fields(catalysis,sensor,energy storage,etc.)during the last decade owing to the trait of abundant surface chemistry,porous structure,easy-to-adjust pore size,and diverse functional ***,the limited active sites and the poor conductivity hinder the relative practical application.2D MOFs can shorten the ion transport path with the merit of layered *** large surface area can increase the number of active sites as well as effectively utilize the sufficient active sites,exhibiting enormous potential in the field of energy storage systems(EESs).In this review,the characteristics of the 2D MOFs have been introduced,and the systematic synthesis methods(top-down and bottom-up)of 2D MOFs are presented,providing fundamental understanding for the construction of 2D ***,the applications of 2D MOFs in energy storage fields such as supercapacitors and batteries are demonstrated in ***,the future development prospects have been proposed,offering guidelines for the rational utilization of 2D MOFs and promoting the understanding of 2D MOFs in EESs.

关键词： batteries electrochemical energy storage supercapacitors 2D metal-organic frameworks

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Methods of improving the initial Coulombic efficiency and rate performance of both anode and cathode materials for sodium-ion batteries

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Chinese Chemical Letters 2022年第2期33卷 730-742页

作者： Nkongolo Tshamala Aristote Kangyu Zou Andi Di wentao deng Baowei Wang Xinglan deng Hongshuai Hou Guoqiang Zou Xiaobo Ji College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Department of Materials and Environmental Chemistry Stockholm UniversityStockholm 10691Sweden

Sodium-ion batteries(SIBs) have gained more scientists’ interest, owing to some facts such as the natural abundance of Na, the similarities of physicochemical characteristics between Li and Na. The irreversible Na+ions consumption during the first cycle of charge/discharge process(due to the formation of the solid electrolyte interface(SEI) on the electrode surface and other irreversible reactions) is the factor that determines high performance SIBs and largely reduces the capacity of the full cell SIBs. Thus, the initial coulombic efficiency(ICE) of SIBs for both anode and cathode materials, is a key parameter for high performance SIBs, and the point is to increase the transport rate of the Na+ions. Therefore, developing SIBs with high ICE and rate performance becomes vital to boost the commercialization of SIBs. Here we provide a review on the methods to improve the ICE and the rate performance, by summarizing some methods of improving the ICE and rate performance of the anode and cathode materials for SIBs, and end by a conclusion with some perspectives and recommendations.

关键词： Initial coulombic efficiency Rate performance Sodium-ion batteries Anode materials Cathode materials

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Ultra-Low-Dose Pre-Metallation Strategy Served for Commercial Metal-Ion Capacitors

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Nano-Micro Letters 2022年第3期14卷 276-291页

作者： Zirui Song Guiyu Zhang Xinglan deng Kangyu Zou Xuhuan Xiao Roya Momen Abouzar Massoudi wentao deng Jiugang Hu Hongshuai Hou Guoqiang Zou Xiaobo Ji College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China Department of Semiconductors Materials and Energy Research Center P.O.Box 14155/4777TehranIran College of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China

Sacrificial pre-metallation strategy could compensate for the irreversible consumption of metal ions and reduce the potential of anode,thereby elevating the cycle performance as well as open-circuit voltage for full metal ion capacitors(MICs).However,suffered from massive-dosage abuse,exorbitant decomposition potential,and side effects of decomposition residue,the wide application of sacrificial approach was ***,assisted with density functional theory calculations,strongly coupled interface(M-O-C,M=Li/Na/K)and electron donating group have been put forward to regulate the band gap and highest occupied molecular orbital level of metal oxalate(M_(2)C_(2)O_(4)),reducing polarization phenomenon and Gibbs free energy required for decomposition,which eventually decrease the practical decomposition potential from 4.50 to 3.95 ***,full sodium ion capacitors constituted of commercial materials(activated carbon//hard carbon)could deliver a prominent energy density of 118.2 Wh kg^(−1)as well as excellent cycle stability under an ultra-low dosage pre-sodiation reagent of 15-30 wt%(far less than currently 100 wt%).Noteworthily,decomposition mechanism of sacrificial compound and the relative influence on the system of MICs after pre-metallation were initially revealed by in situ differential electrochemical mass spectrometry,offering in-depth insights for comprehending the function of cathode *** addition,this breakthrough has been successfully utilized in high performance lithium/potassium ion capacitors with Li_(2)C_(2)O_(4)/K_(2)C_(2)O_(4) as pre-metallation reagent,which will convincingly promote the commercialization of MICs.

关键词： Coupled interface Pre-metallation Metal oxalate Decomposition potential

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K_(x)C_(y) phase induced expanded interlayer in ultra-thin carbon toward full potassium-ion capacitors

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Carbon Energy 2022年第6期4卷 1151-1168页

作者： Xinglan deng Ye Tian Kangyu Zou Jun Chen Xuhuan Xiao Shusheng Tao Zirui Song wentao deng Hongshuai Hou Guoqiang Zou Xiaobo Ji College of Chemistry and Chemical Engineering Central South UniversityChangshaHunanChina College of Materials Science and Engineering Zhengzhou UniversityZhengzhouChina

Carbonaceous materials have been regarded as highly promising anode candidates for potassium storage with their cost-effectiveness and environmental ***,low specific capacity and difficulty in large-scale synthesis largely hinder their further ***,a thermal-induced potassium–carbon alloy phase(K_(x)C_(y))with the expanded interlayer spacing strategy is first put *** in situ high-temperature X-ray diffraction,a K_(2)C_(2) phase is evoked by thermal energy during the in-situ carbonization process of carbon quantum dots intermediate derived from potassium-containing precursors,whereas no lithium or sodium–carbon alloy phase is observed from lithium/sodium-containing *** asobtained ultra-thin carbon nanosheets achieve adjustable layer spacing,preparation in bulk,delivering reversible potassium storage of 403.4 mAh g^(−1) at 100 mA g^(−1) and 161.2 mAh g^(−1) even at 5.0 A g^(−1),which is one of the most impressive K-storage performances reported so far with great potential ***,the assembled potassium-ion hybrid capacitor by combining the impressive CFMs-900 anode with the three-dimensional framework-activated carbon delivers a high energy-power density of 251.7 Wh kg^(−1) at 250Wkg^(−1) with long-term *** study opens a scalable avenue to realize the expanded interlayer spacing,which can be extended to other multicarboxyl potassium salts and can provide approach for the design of high-performance carbon anode materials for potassium storage.

关键词： expanded interlayer K_(x)C_(y)phase potassium-ion capacitors themal-induced ultra-thin carbon

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High-yield red phosphorus sponge mediated robust lithium-sulfur battery

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Nano Research 2023年第6期16卷 8329-8337页

作者： Zheng Luo Shusheng Tao Ye Tian Hanyu Tu Laiqiang Xu wentao deng Guoqiang Zou Hongshuai Hou Xiaobo Ji State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China

Although lithium-sulfur(Li-S)batteries with high specific energy exhibit great potential for next-generation energy-storage systems,their practical applications are limited by the growth of Li dendrites and lithium polysulfides(LiPSs)***,a highly porous red phosphorus sponge(HPPS)with well distributed pore structure was efficiently prepared via a facile and largescale hydrothermal process for polysulfides adsorption and dendrite *** experimental demonstrated,the porous red phosphorus modified separator with increased active site greatly promotes the chemisorption of LiPSs to efficiently immobilize the active sulfur within the cathode section,while Li metal anode activated by Li_(3)P interlayer with abundant ionically conductive channels significantly eliminates the barrier for uniform Li^(+)permeation across the interlayer,contributing to the enhanced stability for both S cathode and Li *** by the HPPS,long-term stability of 1,200 h with minor voltage hysteresis is achieved in symmetric cells with Li_(3)P@Li electrode while Li-S half-cell based on HPPS modified separator delivers an outperformed reversibility of 783.0 mAh·g^(−1)after 300 cycles as well as high-rate performance of 694.5 mAh·g^(−1)at 3 C,which further boosts the HPPS tuned full cells in practical S loading(3 mg·cm^(−2))and thin Li3P@Li electrode(100μm)with a capacity retention of 71.8%after 200 cycles at 0.5 *** work provides a cost-effective and metal free mediator for simultaneously alleviating the fundamental issues of both S cathode and Li anode towards high energy density and long cycle life Li-S full batteries.

关键词： lithium-sulfur battery red phosphorus sponge separator chemical adsorption Li dendrite

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高价阳离子(Al^(3+))诱导的Na_(4)Fe_(3)(PO_(4))_(2)(P_(2)O_(7))正极助力构筑全气候钠离子全电池

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Science Bulletin 2024年第6期69卷 772-783页

作者：高金强曾晶垚简伟顺梅雨倪炼山王浩吉王凯胡新宇邓文韬邹国强侯红帅纪效波 College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Na_(4)Fe_(3)(PO_(4))_(2)(P_(2)O_(7))(NFPP)is currently drawing increased attention as a sodium-ion batteries(SIBs)cathode due to the cost-effective and NASICON-type structure *** to the sluggish electron and Na~+conductivities,however,its real implementation is impeded by the grievous capacity decay and inferior rate ***,multivalent cation substituted microporous Na_(3.9)Fe_(2.9)Al_(0.1)(PO_(4))_(2)(P_(2)O_(7))(NFAPP)with wide operation-temperature is elaborately designed through regulating structure/interface coupled electron/ion ***,the derived Na vacancy and charge rearrangement induced by trivalent Al^(3+)substitution lower the ions diffusion barriers,thereby endowing faster electron transport and Na^(+)*** importantly,the existing Al-O-P bonds strengthen the local environment and alleviate the volume vibration during(de)sodiation,enabling highly reversible valence variation and structural *** a result,remarkable cyclability(over 10,000 loops),ultrafast rate capability(200 C),and exceptional all-climate stability(-40-60℃)in half/full cells are *** this,the rational work might provide an actionable strategy to promote the electrochemical property of NFPP,thus unveiling the great application prospect of sodium iron mixed phosphate materials.

关键词： Multivalent cation substitution All-climate Na^(+)mobility Ultrafast rate capability

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Natural Stibnite for Lithium‑/Sodium‑Ion Batteries:Carbon Dots Evoked High Initial Coulombic Efficiency

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Nano-Micro Letters 2022年第8期14卷 208-228页

作者： Yinger Xiang Laiqiang Xu Li Yang Yu Ye Zhaofei Ge Jiae Wu wentao deng Guoqiang Zou Hongshuai Hou Xiaobo Ji College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China College of Science Hunan University of Technology and BusinessChangsha 410205People’s Republic of China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China

The application of Sb_(2)S_(3)with marvelous theoretical capacity for alkali metal-ion batteries is seriously limited by its poor electrical conductivity and low initial coulombic efficiency(ICE).In this work,natural stibnite modified by carbon dots(Sb_(2)S_(3)@xCDs)is elaborately designed with high ***,chemical processes of local oxidation–partial reduction–deep coupling for stibnite reduction of CDs are clearly demonstrated,confirmed with in situ high-temperature X-ray *** impressively,the ICE for lithium-ion batteries(LIBs)is enhanced to 85%,through the effect of oxygen-rich carbon matrix on C–S bonds which inhibit the conversion of sulfur to sulfite,well supported by X-ray photoelectron spectroscopy characterization of solid electrolyte interphase layers helped with density functional theory *** than less,it is found that Sb–O–C bonds existed in the interface effectively promote the electronic conductivity and expedite ion transmission by reducing the bandgap and restraining the slip of the *** a result,the optimal sample delivers a tremendous reversible capacity of 660 mAh g^(−1)in LIBs at a high current rate of 5 A g^(−1).This work provides a new methodology for enhancing the electrochemical energy storage performance of metal sulfides,especially for improving the ICE.

关键词： Carbon dots Sb_(2)S_(3) Initial Coulombic efficiency Interfacial bond Anode

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