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In Situ Formation of LiF-Rich Carbon Interphase on Silicon Particles for Cycle-Stable Battery Anodes

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Transactions of Tianjin University 2023年第2期29卷 101-109页

作者： Yang Ni Shuibin Tu Renmin Zhan Zhao Cai Xiaohong Wang yongming sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Faculty of Materials Science and Chemistry China University of Geosciences(Wuhan)Wuhan 430074China

Silicon(Si)is a potential high-capacity anode material for the next-generation lithium-ion battery with high energy ***,Si anodes suff er from severe interfacial chemistry issues,such as side reactions at the electrode/electrolyte interface,leading to poor electrochemical cycling ***,we demonstrate the fabrication of a conformal fl uorine-containing carbon(FC)layer on Si particles(Si-FC)and its in situ electrochemical conversion into a LiF-rich carbon layer above 1.5 V(***^(+)/Li).The as-formed LiF-rich carbon layer not only isolates the active Si and electrolytes,leading to the suppression of side reactions,but also induces the formation of a robust solid-electrolyte interface(SEI),leading to the stable interfacial chemistry of as-designed Si-FC *** Si-FC electrode has a high initial Coulombic effi ciency(CE)of 84.8%and a high reversible capacity of 1450 mAh/g at 0.4 C(1000 mA/g)for 300 *** addition,a hybrid electrode consisting of 85 wt%graphite and 15 wt%Si-FC,and mass 2.3 mg/cm^(2) loading delivers a high areal capacity of 2.0 mAh/cm^(2) and a high-capacity retention of 93.2%after 100 cycles,showing the prospects for practical use.

关键词： Lithium-ion batteries Silicon anode LiF-rich carbon interphase Capacity Cycling stability

基于预探索的动态自适应3DVFH+无人机避障算法

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电子设计工程 2024年第4期32卷 1-7页

作者：何晨阳王耀力常青孙永明太原理工大学信息与计算机学院山西太原030024 山西省林业与草原科学研究院山西太原030024

为解决无人机在未知复杂环境下的自主避障规划问题,同时考虑到旋翼无人机平台硬件资源稀缺的问题,提出了一种基于预探索的动态自适应3DVFH+算法。根据无人机飞行进度以及障碍物信息,动态调整代价函数的自适应权重因子;通过对无人机视野... 详细信息

为解决无人机在未知复杂环境下的自主避障规划问题,同时考虑到旋翼无人机平台硬件资源稀缺的问题,提出了一种基于预探索的动态自适应3DVFH+算法。根据无人机飞行进度以及障碍物信息,动态调整代价函数的自适应权重因子;通过对无人机视野范围的预探索,构建了搜索树,并对障碍物及无人机模型进行了建模研究,同步实现了无人机在复杂环境中的可视化分析。结果表明,动态自适应代价函数消除了3DVFH+算法的死区现象;预探索机制解决了算法的局部最优解问题,规划航线缩短37.15%,所需时间减少24.48%。同时搭建了复杂度较高的森林障碍物进行验证分析,相较于使用八叉树框架建图的3DVFH+算法执行相同避障规划任务时节省内存可达25.26%。

关键词：避障规划无人机 3DVFH+ 自适应代价函数预探索

A novel battery scheme:Coupling nanostructured phosphorus anodes with lithium sulfide cathodes

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Nano Research 2020年第5期13卷 1383-1388页

作者： David Sichen Wu Guangmin Zhou Eryang Mao yongming sun Bofei Liu Li Wang Jiangyan Wang Feifei Shi Yi Cui Department of Materials Science and Engineering Stanford UniversityStanfordCalifornia 94305USA Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory2575 Sand Hill RoadMenlo ParkCalifornia 94025USA

Lithium-ion batteries are approaching their theoretical limit and can no longer keep up with the increasing demands of human ***-sulfur batteries,with a high theoretical specific energy,are promising candidates for next generation energy ***,the use of Li metal in Li-S batteries compromises both safety and performance,enabling dendrite formation and causing fast capacity *** studies have probed alternative battery systems to replace the metallic Li in Li-S system,such as a Si/Li2S couple,with limited success in ***,there is a focus on red P as a favorable anode material to host ***,we establish a novel battery scheme by utilizing a P/C nanocomposite anode and pairing it with a Li2S coated carbon nanofiber *** find that red P anode can be compatible in ether-based electrolyte systems and can be successfully coupled to a Li2S *** proof of concept full-cell displays remarkable specific capacity,rate and cycling *** expect our work will provide a useful alternative system and valuable insight in the quest for next generation energy storage devices.

关键词： lithium sulfur batteries red phosphorus lithium sulfide

Insights on“nitrate salt”in lithium anode for stabilized solid electrolyte interphase

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Carbon Energy 2022年第1期4卷 12-20页

作者： Lin Fu Xiancheng Wang Zihe Chen Yuanjian Li Eryang Mao Zhi Wei Seh yongming sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanChina Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)SingaporeSingapore

A Li/KNO_(3) composite(LKNO),with KNO_(3) uniformly implanted in bulk metallic Li,is fabricated for battery anode via a facile mechanical kneading approach,which exhibits high Coulombic efficiency and prolonged cycle *** mechanism behind the enhanced electrochemical performance of the“salt-in-metal”composite is investigated,where KNO_(3) in metallic Li composite electrode would be sustainably released into the *** presence of NO_(3)-stabilizes the solid electrolyte interphase by producing functional Li_(3)N,LiNxOy,and Li_(2)O species.K^(+)from KNO_(3) also helps to form an electrostatic shield after its adsorption on the electrode protrusions,which suppresses the dendritic growth of metallic *** the above advantages,uniform Li plating with dense and planar structure is realized for the LKNO *** findings reveal a deep understanding of the effect of the“saltin-metal”anode and provide new insights into the use of nitrate additives for high-energy-density Li metal batteries.

关键词： electrostatic shield Li metal battery Li/KNO_(3)composite salt-in-metal stabilized solid electrolyte interphase sustained release

In situ formation of ionically conductive nanointerphase on Si particles for stable battery anode

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Science China Chemistry 2021年第8期64卷 1417-1425页

作者： Xiaoxue Chen Gaofeng Ge Wenyu Wang Bao Zhang Jianjun Jiang Xuelin Yang Yuzhang Li Li Wang Xiangming He yongming sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China College of Electrical Engineering&New Energy Hubei Provincial Collaborative Innovation Center for New Energy MicrogridChina Three Gorges UniversityYichang443002China College of Materials and Chemical Engineering University of CaliforniaLos Angeles90095USA Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China

Silicon(Si)is a promising anode candidate for next-generation lithium-ion batteries(LIBs)due to its high theoretical *** Si photovoltaic waste possesses good purity and high *** it as the raw material for battery anodes can synchronously solve the problem of solid waste pollution and enable high energy density LIBs.A critical issue impeding the practical application of Si is the undesirable side reactions at the electrolyte-particle interface and the resulting increase in impedance during ***,a Si-P core shell structure with chemical bonding at the Si-P interface is fabricated through a simple mechanical alloying reaction between red P and solar Si photovoltaic *** P nanoshell with thickness within 15 nm converts to Li3P during the initial lithiation process and maintains its phase on *** as-formed Li3P nanolayer functions as a stable,ionically conductive protective layer that reduces the direct contact between Si and electrolytes,and thus suppresses undesired side *** Si-P nanocomposite exhibits stable electrochemical cycling with a high reversible capacity of 1,178 mAh g^(−1)after 500 cycles at 1,200 mA g^(−1),as well as excellent rate capability(912 mAh g^(−1)at 2 C).With 15 wt%addition to graphite,a graphite/Si-P hybrid electrode shows a high overall reversible specific capacity of 447 mAh g^(−1)and 88.3%capacity retention after 100 cycles at high areal capacity of 2.64 mAh cm^(−2) at 100 mA g^(−1),indicating its promise as a drop-in anode in practical LIBs.

关键词： silicon anode Li3P interface stability lithium-ion batteries

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一体化压铸单元设备解决方案

特种铸造及有色合金 2024年第8期44卷 1062-1066页

作者：曾庆杰聂俊毅孙永明黄壮才陈诗明万里黄志垣广东鸿图科技股份有限公司肇庆526100

新能源汽车的快速发展催生了铝合金压铸件向大型化、一体化、轻量化的方向发展。一体化压铸件的生产,必须解决产品尺寸过大导致的压铸机合模力需求大增、铸件流程过长导致的模具温度平衡、生产节拍过长、产品变形、保温炉局限导致的铝... 详细信息

新能源汽车的快速发展催生了铝合金压铸件向大型化、一体化、轻量化的方向发展。一体化压铸件的生产,必须解决产品尺寸过大导致的压铸机合模力需求大增、铸件流程过长导致的模具温度平衡、生产节拍过长、产品变形、保温炉局限导致的铝液质量不高以及给汤效率问题。针对这些问题,提出一体化压铸单元设备的解决方案,包括压铸单元布局、模具的喷涂润滑、铝液的供给、模具温度的平衡控制、压铸超高真空控制技术等。

关键词：一体化压铸单元设备单元布局

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Stress-Regulation Design of Lithium Alloy Electrode toward Stable Battery Cycling

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Energy & Environmental Materials 2023年第1期6卷 184-191页

作者： Chunhao Li Shuibin Tu Xin Ai Siwei Gui Zihe Chen Wenyu Wang Xiaoxiao Liu Yuchen Tan Hui Yang yongming sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mould Technology Department of MechanicsSchool of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Metallic tin(Sn)foil is a promising candidate anode for lithium-ion batteries(LIBs)due to its metallurgical processability and high ***,it suffers low initial Coulombic efficiency and inferior cycling stability due to its uneven alloying/dealloying reactions,large volume change and stress,and fast electrode structural ***,we report an undulating LiSn electrode fabricated by a scalable two-step procedure involving mechanical lithography and chemical prelithiation of Sn *** the combination of experimental measurements and chemo-mechanical simulations,it was revealed the obtained undulating LiSn/Sn electrode could ensure better mechanical stability due to the pre-swelling state from Sn to Li x Sn and undulating structure of lithography in comparison with plane Sn,homogenize the electrochemical alloying/dealloying reactions due to the activated surface materials,and compensate Li loss during cycling due to the introduction of excess Li from Li_(x)Sn,thus enabling enhanced electrochemical *** cells consisting of undulating LiSn/Sn electrode with an active thickness of∼5 um displayed stable cycling over 1000 h at 1 mA cm^(-2) and 1 mAh cm^(-2) with a low average overpotential of<15 *** paired with commercial LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)cathode with high mass loading of 15.8 mg cm^(-2),the full cell demonstrated a high capacity of 2.4 mAh cm^(-2) and outstanding cycling stability with 84.9% capacity retention at 0.5 C after 100 *** work presents an advanced LiSn electrode with stress-regulation design toward high-performance LIBs,and sheds light on the rational electrode design and processing of other high-capacity lithium alloy anodes.

关键词： chemo-mechanical simulation lithium alloy lithium-ion batteries mechanical lithography stress regulation

Flexible fiber-shaped supercapacitors based on hierarchically nanostructured composite electrodes

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Nano Research 2015年第4期8卷 1148-1158页

作者： Henghui Xu Xianluo Hu yongming sun Huiling Yang Xiaoxiao Liu Yunhui Huang State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering HuazhongUniversity of Science and Technology Wuhan 430074 China

A novel all-solid-state, coaxial, fiber-shaped asymmetric supercapacitor has been fabricated by wrapping a conducting carbon paper on a MnO2-modified nanoporous gold wire. This energy wire exhibits high capacitance of 12 ***^-2 and energy density of 5.4 μ***^-2 with excellent cycling stability. Hierarchical nanostructures and coaxial architectural design facilitate effective contacts between the two core@sheath electrodes and active layers with high flexibility and high performance. This work provides the first example of coaxial fiber- shaped asymmetric supercapacitors with an operation voltage of 1.8 V, and holds great potential for future flexible electronic devices.

关键词： all-solid-state energy storage flexible device hierarchical nanostructure supercapacitors

Circumventing chemo-mechanical failure of Sn foil battery anode by grain refinement and elaborate porosity design

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Journal of Energy Chemistry 2021年第11期30卷 477-484,I0010页

作者： Shuibin Tu Xin Ai Xiancheng Wang Siwei Gui Zhao Cai Renming Zhan Yuchen Tan Weiwei Liu Hui Yang Chenhui Li yongming sun State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina b Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Tin (Sn) metal foil is a promising anode for next-generation high-energy–density lithium-ion batteries (LIBs) due to its high capacity and easy processibility. However, the pristine Sn foil anode suffers nonuniform alloying/dealloying reaction with lithium (Li) and huge volume variation, leading to electrode pulverization and inferior electrochemical performance. Herein, we proposed that reduced grain size and elaborate porosity design of Sn foil can circumvent the nonuniform alloy reaction and buffer the volume change during the lithiation/delithiation cycling. Experimentally, we designed a three-dimensional interconnected porous Sn (3DIP-Sn) foil by a facile chemical alloying/dealloying approach, which showed improved electrochemical performance. The enhanced structure stability of the as-fabricated 3DIP-Sn foil was verified by chemo-mechanical simulations and experimental investigation. As expected, the 3DIP-Sn foil anode revealed a long cycle lifespan of 4400 h at 0.5 mA cm^(−2) and 1 mAh cm^(−2) in Sn||Li half cells. A 3DIP-Sn||LiFePO_(4) full cell with LiFePO_(4) loading of 7.1 mg cm^(−2) exhibited stable cycling for 500 cycles with 80% capacity retention at 70 mA g^(−1). Pairing with high-loading commercial LiNi0.6Co0.2Mn0.2O_(2) (NCM622, 18.4 mg cm^(−2)) cathode, a 3DIP-Sn||NCM622 full cell delivered a high reversible capacity of 3.2 mAh cm^(−2). These results demonstrated the important role of regulating the uniform alloying/dealloying reaction and circumventing the localized strain/stress in improving the electrochemical performance of Sn foil anodes for advanced LIBs.

关键词： Sn foil anode 3D interconnected porous structure Grain refinement Uniform alloying/dealloying reaction Chemo-mechanical failure