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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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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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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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Al, Zr dual-doped cobalt-free nickel-rich cathode materials for lithium-ion batteries

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Progress in Natural Science:Materials International 2023年第1期33卷 108-115页

作者： Xinxin Tan Wenjie Peng Meng Wang Gui Luo Zhixing Wang guochun yan Huajun Guo Qihou Li Jiexi Wang School of Metallurgy and Environment Central South University BASF ShanShan Battery Materials Co. LTD Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South University Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South University

Nickel-rich and cobalt-free cathode materials have obvious advantages in the aspects of energy density and economic efficiency. However, these materials are restricted from being used in commercial lithium-ion batteries due to the problems of poor structural stability and rate capability. In this study, the aluminum and zirconium dual-doped Co-free Ni-rich LiNi0.96Mn0.04O2cathode material(NMAZ) is prepared by a facile high-temperature solid-phase method. The obtained NMAZ shows low cation disordering degree owing to the stability of transition metal slabs induced by strong Al–O and Zr–O bonds. Besides, the kinetics of lithium-ion diffusion is significantly improved by larger c-axis and the fast lithium-ion conducting Li2ZrO3layer on the interface. As a result, NMAZ shows an improved capacity retention of 70.3% at 1C after 100 cycles under an elevated temperature(45°C), compared with 50.5% of pure LiNi0.96Mn0.04O2. In addition, it exhibits splendid rate performance even at higher C-rate and better thermal stability compared to bare LiNi0.96Mn0.04O2. Hence, the Al, Zr dualdoped modification is beneficial to improving the structural stability and electrochemical performance of the Ni-rich and Co-free layered oxide cathodes for Li-ion batteries.

关键词： Lithium-ion batteries Ni-rich Co-free Layered oxide cathode Dual-doping

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Facile and scalable fabrication of lithiophilic Cu_(x)O enables stable lithium metal anode

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Journal of Energy Chemistry 2022年第12期75卷 285-292,I0007页

作者： yanmei Nie Xiangyu Dai Jiexi Wang Zhengfang Qian Zhixing Wang Huajun Guo guochun yan Dongting Jiang Renheng Wang Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060GuangdongChina School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina

Equipped with highest-energy density anode,lithium metal batteries are of great interests for the nextgeneration energy storage ***,the existing problems like uneven Li deposition,large volume expansion and short cycling lifespan severely retard the implementation of Li metal ***,we report an in-situ formed Cu_(x)O nanofiber network synthesized by facile and scalable calcination process and employ as stable lithium metal *** CuO/Cu_(2)O ratio in the lithiophilic Cu_(x)O network can be adjusted through an optimal annealing time,thus guiding the homogeneous distribution of Li atoms and regulating the repeated plating/stripping *** a result,Li@Cu_(x)O 3D scaffold displays an ultralow overpotential of 7.7 mV,long cycling life for more than 1000 h in symmetric cell,and exceptional stability for LiFePO_(4)//Li full *** work provides guidelines for the design and fabrication of lithiophilic 3D matrixes and advances the practical use of lithium metal batteries.

关键词： Lithium metal batteries 3D collectors Lithiophilic modification

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新型聚乙烯弹性体导向的α-二亚胺镍配合物催化剂的研究进展

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石油化工 2024年第4期53卷 463-488页

作者：张秋月闫国春王建立李艺张世杰王权超马艳平孙文华中国科学院化学研究所中国科学院工程塑料重点实验室北京100190 中国神华煤制油化工有限公司北京100011

乙烯与α-烯烃共聚所制备的聚烯烃弹性体是聚烯烃材料的热点,可广泛应用于塑料相容剂、鞋底基材、光伏封装胶膜、微电子封装材料和弹性体纤维等高附加值产品领域。在我国缺少α-烯烃单体的形势下,迫切需要跨越传统共聚体系的新型催化剂... 详细信息

乙烯与α-烯烃共聚所制备的聚烯烃弹性体是聚烯烃材料的热点,可广泛应用于塑料相容剂、鞋底基材、光伏封装胶膜、微电子封装材料和弹性体纤维等高附加值产品领域。在我国缺少α-烯烃单体的形势下,迫切需要跨越传统共聚体系的新型催化剂。Brookhart型α-二亚胺镍(Ⅱ)配合物催化剂能够实现单一乙烯聚合制备聚乙烯弹性体,是特别值得重视和推进产业化的催化剂体系。该类催化剂在催化乙烯聚合过程中采用“链行走”机理,“通过调控催化剂结构,不仅可以调节催化活性,更重要地可实现对所得聚乙烯支链的有效剪裁”;这些微观结构可控的聚乙烯弹性体在具有窄分子量分布特点的基础上,涵盖了从低分子量(降凝剂)、中等分子量(膜材)到高分子量(高强度树脂)各个范围的聚合产物。综述了可制备乙烯低聚物,油性低分子量、中等分子量、高分子量甚至超高分子量全系列支化聚乙烯的α-二亚胺镍(Ⅱ)配合物的最新结构演变进展,对结构的改性包括N-芳基取代基的修饰、配体骨架结构的修饰和双核配体的利用三个部分;从空间效应和电子效应两方面探讨了配合物结构与催化性能的关系。α-二亚胺镍(Ⅱ)催化剂合成简单,具有中试放大基础和产业化推进的潜能,为单一乙烯聚合制备多品种新型聚乙烯弹性体奠定了良好基础。

关键词： α-二亚胺镍配合物链行走机理乙烯低聚乙烯聚合聚乙烯弹性体

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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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Multi-scale boron penetration toward stabilizing nickel-rich cathode

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Fundamental Research 2023年第4期3卷 618-626页

作者： Bianzheng You Zhixing Wang Yijiao Chang Wei Yin Zhengwei Xu Yuexi Zeng guochun yan Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China Energy Storage&Distributed Resources Division Lawrence Berkeley National Laboratory1 Cyclotron RdBerkeleyCA 94720USA 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 410083

Nickel-rich layered oxides LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)(x≥0.8)have been recognized as the preferred cathode materials to develop lithium-ion batteries with high energy density(>300 Wh kg^(−1)).However,the poor cycling stability and rate capability stemming from intergranular cracks and sluggish kinetics hinder their *** address such issues,a multi-scale boron penetration strategy is designed and applied on the polycrystalline LiNi_(0.83)Co_(0.11)Mn_(0.06)O_(2)particles that are pre-treated with pore *** lithium-ion conductive lithium borate in grain gaps functions as the grain binder that can bear the strain/stress from anisotropic contraction/expansion,and provides more pathways for lithium-ion *** a result,the intergranular cracks are ameliorated and the lithium-ion diffusion kinetics is ***,the coating layer separates the sensitive cathode surface and electrolyte,helping to suppress the parasitic reactions and related gas *** addition,the enhanced structural stability is acquired by strong B-O bonds with trace boron *** a result,the boron-modified sample with an optimized boron content of 0.5%(B5-NCM)exhibits a higher initial discharge capacity of 205.5 mAh g^(−1)at 0.1C(1C=200 mA g^(−1))and improved capacity retention of 81.7%after 100 cycles at ***,the rate performance is distinctly enhanced by high lithium-ion conductive LBO(175.6 mAh g^(−1)for B5-NCM and 154.6 mAh g^(−1)for B0-NCM at 5C)

关键词： Nickel-rich layered oxides Lithium borates Intergranular cracks Lithium-ion diffusion kinetics Trace boron doping Gas evolution

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A new approach of drawing airport noise contours on computer based on Surfer

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Journal of Environmental Sciences 2004年第4期16卷 576-580页

作者： ZHANGBang-jun guochun-yan DiGuo-qing epartmentofEnvironmentalScience ZhejiangUniversityHangzhou310028China TheRadiationMonitoringTechnicalCenter SEPAHangzhou310012China

Noise contours are used to describe the extent of airport noise pollution and to plan land use around airports. The L WECPN(weighted equivalent continuous perceive noise level) recommended by ICAO(International Civil Aviation Organization) is adopted as airport noise rating parameter in this paper. With the help of various mathematical models in the software Surfer, noise contours can be drawn automatically by the completed program in Visual C++ Code. Corrections for thrust, velocity, atmospheric temperature, humidity and lateral ground attenuation are also considered in the new method, which can improve the efficiency of drawing contours. An example of its use for drawing noise contours of an airport in Zhejiang Province of China is proposed and the predictions and the measurements show agreements well.

关键词： airport noise contours weighted equivalent continuous perceive noise level(L WECPN) Surfer

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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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