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Boosting the performance of liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) electrode by uniform li_(3)PO_(4) coating via atomic layer deposition

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Chinese Chemical Letters 2024年第5期35卷 499-503页

作者： Mingjiao Lu Zhixing Wang Gui Luo Huajun Guo xinhai li.guochun yan Qihou li Xianglin li Ding Wang Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China BASF ShanShan Battery Materials Co. Ltd.Changsha 410006China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China National and Local Joint Engineering Laboratory for lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China

Ultra-high nickel material is considered to be a promising cathode ***,with the increase of nickel content,the interfacial side reactions between the cathode and electrolyte become increasingly ***,an atomically controllable ionic conductor li_(3)PO_(4)(LPO)coating is deposited on the liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2)(NCM9064)based electrode by the atomic layer deposition *** results shows that the LPO coating is uniformly and densely covered on the surface of secondary particles of NCM9064,helping to prevent the direct contact between the electrolyte and cathode during the chargingdischarging *** addition,the coating layer is electrochemically *** a result,the interfacial side reactions during the long cycle are effectively suppressed,and the solid electrolyte interphase layer at the interface is *** electrode with 20 layers of LPO deposition(ALD-LPO-20)exhibits an excellent capacity retention of 81%after 200 cycles in 2.8-4.3 V at 25℃,which is 18%higher than the unmodified material(ALD-LPO-0).Besides,the moderate LPO coating improves the rate capability and high temperature cycling performance of *** study provides a method for the modification of ultra-high nickel cathode materials and corresponding electrodes.

关键词： Ultra-high nickel material liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) Atomic layer deposition li_(3)PO_(4) Ionic conductor

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Innovative Solutions for High-Performance Silicon Anodes in lithium-Ion Batteries:Overcoming Challenges and Real-World Applications

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Nano-Micro Letters 2024年第9期16卷 341-384页

作者： Mustafa Khan Suxia yan Mujahid Ali Faisal Mahmood yang Zheng guochun li Junfeng liu Xiaohui Song Yong Wang Institute for Energy Research Jiangsu UniversityZhenjiang 212013JiangsuPeople’s Republic of China School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuPeople’s Republic of China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009AnhuiPeople’s Republic of China

Silicon(Si)has emerged as a potent anode material for lithium-ion batteries(liBs),but faces challenges like low electrical conductivity and significant volume changes during lithiation/delithiation,leading to material pulverization and capacity *** research on nanostructured Si aims to mitigate volume expansion and enhance electrochemical performance,yet still grapples with issues like pulverization,unstable solid electrolyte interface(SEI)growth,and interparticle *** review delves into innovative strategies for optimizing Si anodes’electrochemical performance via structural engineering,focusing on the synthesis of Si/C composites,engineering multidimensional nanostructures,and applying non-carbonaceous *** a stable SEI is vital to prevent electrolyte decomposition and enhance li^(+)transport,thereby stabilizing the Si anode interface and boosting cycling Coulombic *** also examine groundbreaking advancements such as self-healing polymers and advanced prelithiation methods to improve initial Coulombic efficiency and combat capacity *** review uniquely provides a detailed examination of these strategies in real-world applications,moving beyond theoretical *** offers a critical analysis of these approaches in terms of performance enhancement,scalability,and commercial *** conclusion,this review presents a comprehensive view and a forward-looking perspective on designing robust,high-performance Si-based anodes the next generation of liBs.

关键词： Silicon anode Energy storage Nanostructure Prelithiation Binder

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Engineering hydrophobic protective layers on zinc anodes for enhanced performance in aqueous zinc-ion batteries

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Journal of Energy Chemistry 2024年第10期97卷 1-11页

作者： Taofeng li Suxia yan Hongyu Dong yang Zheng Kun Ming Ying Chen Haitao li.guochun li Zhixia He Weimin li Quan Wang Xiaohui Song Junfeng liu Edison Huixiang Ang Yong Wang Institute for Energy Research Jiangsu University School of Mechanical Engineering Jiangsu University Shenzhen College of Advanced Technology University of Chinese Academy of Sciences Shandong Zhongke Advanced Technology Co. Ltd School of Materials Science and Engineering Hefei University of Technology Natural Sciences and Science Education National Institute of Education Nanyang Technological University

Aqueous zinc-ion batteries possess substantial potential for energy storage applications;however,they are hampered by challenges such as dendrite formation and uncontrolled side reactions occurring at the zinc *** our investigation,we sought to mitigate these issues through the utilization of in situ zinc complex formation reactions to engineer hydrophobic protective layers on the zinc anode *** robust interfacial layers serve as effective barriers,isolating the zinc anode from the electrolyte and active water molecules and thereby preventing hydrogen evolution and the generation of undesirable ***,the presence of numerous zincophilic sites within these protective layers facilitates uniform zinc deposition while concurrently inhibiting dendrite *** comprehensive evaluation of functional anodes featuring diverse functional groups and alkyl chain lengths,we meticulously scrutinized the underlying mechanisms influencing performance *** analysis involved precise modulation of interfacial hydrophobicity,rapid Zn2+ion transport,and ordered deposition of Zn2+***,the optimized anode,fabricated with octadecylphosphate（OPA）,demonstrated exceptional performance *** Zn//Zn symmetric cell exhibited remarkable longevity,exceeding 4000 h under a current density of 2 mA cm-2and a capacity density of 2 mA h cm-2,Furthermore,when integrated with a VOH cathode,the complete cell exhibited superior capacity retention compared to anodes modified with alternative organic molecules.

关键词： Aqueous zinc-ion batteries Dendrite growth inhibition Energy storage Hydrophobic protective layers Zinc anode stability

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Electrospinning-Enabled Si/C Nanofibers with Dual Modification as Anode Materials for High-Performance lithium-Ion Batteries

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 329-336页

作者： Yi yan Huajun Guo Zhixing Wang xinhai li.guochun yan Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China

In this work,silicon@reduced graphene oxide/pyrolytic carbon nanofibers(Si@RGO/C NFs)composite with double modified layer is prepared through electrospinning,stabilization and *** this composite,polyethylene oxide-polypropylene oxide-polyethylene oxide(P123,a non-ionic surfactant)is introduced as the dispersant,which can make silicon nanoparticles evenly dispersed in electrospinning solution to prevent it from *** modified layer can buffer the volumetric expansion of silicon nanoparticles,prevent direct contact between silicon and electrolyte as well as enhance the electrical ***,carbon fibers synthesized by electrospinning can encapsulate silicon@graphene composite internally to form a double modified *** composite with double modified layer can further alleviate the volume change of silicon nanoparticles and avoid direct contact between silicon and electrolyte to form a stable *** to the above-mentioned merits,the Si@RGO/C NFs composite exhibits excellent cyclic stability and superior rate ***,it maintains a specific capacity of 929 mA h g^(-1)with the retention ratio of 83.1%after 100 cycles at 0.5 A g^(-1)and delivers an outstanding rate capability of 1003 mA h g^(-1)at 2 A g^(-1).

关键词： lithium-ion batteries Silicon/carbon composite Surface modification Graphene Electrospinning

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Free-standing ultrathick liMn_(2)O_(4)@single-wall carbon nanotubes electrode with high areal capacity

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Journal of Energy Chemistry 2022年第10期31卷 452-459,I0012页

作者： Yuntao Guo xinhai li Zhixing Wang Jiexi Wang Huajun Guo guochun yan School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083HunanChina Hunan Provincial Key Laboratory of Nonferrous Value-added Metallurgy Central South UniversityChangsha 410083HunanChina

The ever-increasing demands for advanced lithium-ion batteries with high energy density have greatly stimulated the pursuit of thick electrodes with high active material ***,it is not feasible to prepare thick electrodes with traditional coating methods due to mechanical ***,using single-wall carbon nanotubes(SWCNT)as conductive carbon and binder,free-standing liMn_(2)O_(4) thick electrodes(F-LMO)with ultrahigh-mass loading up to~190 mg cm^(-2)were prepared by vacuum filtration combined with *** thick electrodes with~30 mg cm^(-2)mass loading achieved a high specific capacity of 106.7 mAh g^(-1)with a good capacity retention of 94%over 50 cycles at 0.5 C,which was superior to the traditional coating electrodes(~20 mg cm^(-2))of 99.3 mAh g^(-1)with 95%because of the enhanced electronic conductivity originated from *** addition,the high active material ratio of 97.5 wt%,near-theoretical reversible capacity,and high mass loading gave ultrathick F-LMO electrodes(600μm)of~190 mg cm^(-2)with a remarkable areal capacity of 20 mAh cm^(-2).Moreover,the concentration polarization that occurred in the thick F-LMO electrodes under high current density was discussed via electrochemical stimulation.

关键词： Thick electrodes Free-standing High areal capacity Concentration polarization

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Evolution of the morphology,structural and thermal stability of liCoO_(2) during overcharge

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Journal of Energy Chemistry 2021年第4期30卷 524-532页

作者： Zhitao E Huajun Guo guochun yan Jiexi Wang Rukun Feng Zhixing Wang xinhai li School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina

The overcharge behaviors of 1000 m Ah liCoO_(2)/graphite pouch cells are systematically investigated through the analysis of morphology,structural and thermal stability of liCoO_(2) under different state of charge(SOC)of 120%,150%,174%,190%and 220%.The liCoO_(2) experiences the phase transition from O3 to H1-3 and then O1 together with the grain breakage and boundary slip as evidenced by XRD and SEM analysis respectively,which results in the pronounced Co dissolution after the SOC of 174%.The impedance analysis of the pouch cells and coin cells demonstrates that the main contribution of impedance increase originates from the liCoO_(2) *** the combined effect of structural collapse,Co dissolution,and electrolyte oxidization,the thermal stability of li CoO_(2) cathode materials reduces with the progressing of overcharge as revealed by differential scanning calorimetry(DSC)*** hope that this comprehensive understanding can provide meaningful guidance for advancing the overcharge performance of liCoO_(2)/graphite pouch cells.

关键词： li-ion batteries Overcharge Stability liCoO_(2)

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Revealing the potential of apparent critical current density of li/garnet interface with capacity perturbation strategy

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Journal of Energy Chemistry 2023年第4期79卷 56-63页

作者： Zhihao Guo xinhai li Zhixing Wang Huajun Guo Wenjie Peng Guangchao li.guochun yan Qihou li Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083HunanChina Key Laboratory of Value-added Metallurgy of Hunan Province Central South UniversityChangsha 410083HunanChina

Apparent critical current density(j_(Ac)^(a))of garnet all-solid-state lithium metal symmetric cells(ASSLSCs)is a fundamental parameter for designing all-solid-state lithium metal ***,how much the possible maximum apparent current density that a given ASSLSC system can endure and how to reveal this potential still require ***,a capacity perturbation strategy aiming to better measure the possible maximum j_(Ac)^(a)is proposed for the first *** garnet-based plane-surface structure ASSLSCs as an exemplification,the j_(Ac)^(a)is quite small when the capacity is dramatically *** a perturbed capacity of 0.001 mA h cm^(-2),the j_(Ac)^(a)is determined to be as high as 2.35 mA cm^(-2)at room *** investigation demonstrates that the capacity perturbation strategy is a feasible strategy for measuring the possible maximum j_(Ac)^(a)of li/solid electrolyte interface,and hopefully provides good references to explore the critical current density of other types of electrochemical systems.

关键词： All-solid-state lithium batteries li/solid electrolyte interface Apparent critical current density Interfacial state variation Capacity perturbation strategy

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Incorporating multifunctional liAlSiO_(4) into polyethylene oxide for high-performance solid-state lithium batteries

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Journal of Energy Chemistry 2021年第2期30卷 116-123,I0005页

作者： Yuqi Wu xinhai li.guochun yan Zhixing Wang Huajun Guo Yong Ke lijue Wu Haikuo Fu Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083HunanChina Guangdong Jiana Energy Technology Co. Ltd.Qingyuan 513056GuangdongChina

High ionic conductivity,good electrochemical stability,and satisfactory mechanical property are the crucial factors for polymer solid state ***,fast ion conductor liAlSiO_4(LASO) is incorporated into polyethylene oxide(PEO)-based solid-state electrolytes(SSEs).The SSEs containing LASO exhibit enhanced mechanical properties performance compared to pristine PEO-liTFSI electrolyte.A reduced melting transition temperature of 40.57℃ is enabled by introducing LASO in to PEO-based SSE,which is beneficial to the motion of PEO chain and makes it possible for working at a moderate *** with the enhanced motion of PEO,dissociation of the lithium salt,and conducting channel of LASO,the optimized composite polymer SSE exhibits a high ionic conductivity of 4.68×10^(-4),3.16×10^(-4) and 1.62×10^(-4) S cm^(-1) at 60,50 and 40℃,*** corresponding liFePO_4//li solid-state battery exhibits high specific capacities of 166,160 and 139 mAh g^(-1) at 0.2 C under 60,40 and 25℃.In addition,it remains 130 mAh g^(-1) at 4.0 C,and maintains 91.74% after 500 cycles at 1.0 C under 60℃.This study provides a simple approach for developing ionic conductor-filled polymer electrolytes in solid-state lithium battery application.

关键词： liAlSiO_(4) Polyethylene oxide Solid state battery Composite polymer electrolyte Ionic conductivity

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Preparation of low cobalt-doped liNiO2 materials by the spray pyrolysis method

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Progress in Natural Science:Materials International 2023年第4期33卷 425-432页

作者： Bianzheng You Zhixing Wang Ding Wang Gui Luo Duo Deng guochun yan Huajun Guo xinhai li Wenjie Peng Mingxia Dong Jiexi Wang National Key Laboratory of Energy Metal Resources and New Materials Engineering Research Center of the Ministry of Education for Advanced Battery Materials Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy School of Metallurgy and Environment Central South University National and Local Joint Engineering Laboratory for lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Research Institute BASF Shanshan Battery Materials Co LTD.

liNiO2(LNO) is recognized as the most promising cathode material for next-generation lithium-ion batteries owing to its highest energy density and economic benefit in the layered oxide cathode materials ***, severe cation disordering, multiple phase transformations and poor lithium-ion diffusion kinetics,which result in rapid degradation of cycling stabilities and rate properties, hinder its further practical applications. Cobalt doping is an effective strategy to address such issues, but the influences of cobalt on LNO materials have not been figured out completely yet. Hence, a systematical investigation of cobalt doping for liNiO2cathode materials prepared by spray pyrolysis is conducted. The addition of cobalt enhances the stabilities of layered structures and suppresses the cation disordering effectively. The multiple-phase transformations during cycling are also alleviated significantly. Furthermore, cobalt doping can decrease charge transfer resistances and improve lithium-ion diffusion kinetics, especially at high de-lithiation states. As a result, the electrochemical performances are improved comprehensively after cobalt doping. The LNO with optimal doping amount exhibits an improved capacity retention of 78.0% after 100 cycles as compared with 64.9% for pristine LNO, and an outstanding rate performance of 167.2 mA h g-1with the current density of 5 C(1 C = 200 mA g-1).

关键词： lithium nickel oxides Spray pyrolysis Cobalt doping Phase transformations lithium-ion diffusion kinetics

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农村留守儿童脆弱性测度及影响机制分析——以甘肃省庆阳市宁县为例

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人口与发展 2024年第4期30卷 16-26页

作者：赵海莉李国春严佳星张芳吴明慧西北师范大学地理与环境科学学院甘肃兰州723000

儿童的发展一直是国家发展的重点关注方向,留守儿童作为一个特殊群体,由于长期与父母分居两地引发的亲子疏离,使其存在诸多潜在风险。以甘肃省庆阳市宁县为研究区,对346个留守对象进行问卷调查,从暴露风险、敏感性和适应能力3个维度构... 详细信息

儿童的发展一直是国家发展的重点关注方向,留守儿童作为一个特殊群体,由于长期与父母分居两地引发的亲子疏离,使其存在诸多潜在风险。以甘肃省庆阳市宁县为研究区,对346个留守对象进行问卷调查,从暴露风险、敏感性和适应能力3个维度构建脆弱性评价指标体系,采用脆弱性模型对留守儿童脆弱性进行评价,运用聚类分析法对脆弱性类型进行划分,并利用障碍度模型对影响该地区留守儿童脆弱性的障碍因子进行识别。研究发现:(1)留守儿童脆弱性总体上呈现中等偏高的状态;(2)脆弱性不同角度特征:男生高于女生、除高一外的中学年级高于小学年级、双留守较单留守显著且不同留守角色对儿童的影响存在差异性;(3)留守儿童脆弱性分为安全脆弱型、物质脆弱型、亲情脆弱型、健康脆弱型和全面脆弱型5类;(4)留守儿童脆弱性关键影响因素表现在政府政策支持度、教育资源可获得情况、物质生活条件和家庭氛围及个人心理状况和兴趣爱好等方面。研究认为,降低留守儿童脆弱性,既能保障留守儿童自身健康成长,又对实现乡村振兴具有积极意义。

关键词：留守儿童留守风险脆弱性测度影响机制甘肃省宁县

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