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A long-life and safe lithiated graphite-selenium cell with competitive gravimetric and volumetric energy densities

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Journal of Energy Chemistry 2021年第9期30卷 556-563页

作者： Xiaoqun Qi Qiang Jin Fengyi Yang Ruining Jiang Quan Sun long qie Yunhui Huang Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China

Lithium-selenium(Li-Se) battery is a promising system with high theoretical gravimetric and volumetric energy densities, while its long-term cyclability is hard to realize, especially when a practical Se cathode with high Se content, high Se loading, and high density is employed. The main obstacles are the sluggish conversion kinetics of the dense Se cathodes and the continuous deterioration of the Li-metal ***, by introducing an acetonitrile(AN)-based electrolyte and replacing the Li electrode with a lithiated graphite, we successfully build a hybrid conversion-intercalation system using a high-content(80 wt%),decent-loading(3.0 mg cm^(-2)), and low-porosity(44%) Se cathode. The as-designed lithiated graphite||Se(LG||Se) cell demonstrated a high Se utilization(97.4%), a long cycle life(3000 cycles), and an ultrahigh average Coulombic efficiency(99.98%). The cell also works well under lean-electrolyte(2 l L mg^(-1)) condition and shows outstanding safety performance in the nail-penetrating test. The combination affords the competitive comprehensive performances, including high volumetric and gravimetric energy densities, long cycling life, and superb safety of the LG||Se cell. In addition, with a newly-designed threeelectrode pouch cell, the lithiation of the graphite anodes could be done with an in-situ lithiation process,indicating the high potential of the as-proposed LG||Se cell for the practical applications.

关键词： Conversion-intercalation Acetonitrile electrolyte Se cathode Lithiated graphite Energy density

Design of Lattice Structures Using Local Relative Density Mapping Method

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Chinese Journal of Mechanical Engineering 2018年第5期31卷 110-118页

作者： Guo-Hua Song Shi-Kai Jing Fang-Lei Zhao Ye-Dong Wang Hao Xing long-Fei qie Beijing Xinghang Mechanical-electrical Equipment Co.Ltd. Beijing 100074 China School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China

In order to solve the problem of substantial computational resources of lattice structure during optimization, a local relative density mapping(LRDM) method is proposed. The proposed method uses solid isotropic microstructures with penalization to optimize a model at the macroscopic scale. The local relative density information is obtained from the topology optimization result. The contour lines of an optimized model are extracted using a density contour approach, and the triangular mesh is generated using a mesh generator. A local mapping relationship between the elements’ relative density and the struts’ relative cross?sectional area is established to automatically determine the diameter of each individual strut in the lattice structures. The proposed LRDM method can be applied to local finite element meshes and local density elements, but it is also suitable for global ones. In addition, some cases are con?sidered in order to test the e ectiveness of the LRDM method. The results show that the solution time of the LRDM is lower than the RDM method by approximately 50%. The proposed method provides instructions for the design of more complex lattice structures.

关键词： Lattice structures Local relative density mapping Topology optimization Additive manufacturing

An efficient recycling strategy to eliminate the residual“impurities”while heal the damaged structure of spent graphite anodes

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Green Energy & Environment 2024年第6期9卷 1027-1034页

作者： Dan Yang Ying Yang Haoran Du Yongsheng Ji Mingyuan Ma Yujun Pan Xiaoqun Qi Quan Sun Kaiyuan Shi long qie Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai201804China State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Shuangdeng Group Co. Ltd.Taizhou225500China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou510275China

The recycling of graphite from spent lithium-ion batteries(LIBs)is overlooked due to its relatively low added value and the lack of efficient recovering *** reuse the spent graphite anodes,we need to eliminate their useless components(mainly the degraded solid electrolyte interphase,SEI)and reconstruct their damaged ***,a facile and efficient strategy is proposed to recycle the spent graphite on the basis of the careful investigation of the composition of the cycled graphite anodes and the rational design of the regeneration *** regenerated graphite,which is revitalized by calcination treatment and acid leaching,delivers superb rate performance and a high specific capacity of 370 mAh g^(-1)(~99% of its theoretical capacity)after 100 cycles at 0.1 C,superior to the commercial graphite *** improved electrochemical performance could be attributed to unchoked Li^(+) transport channels and enhanced charge transfer reaction due to the effective destruction of the degraded SEI and the full recovery of the damaged structure of the spent *** work clarifies that the electrochemical performance of the regenerated graphite could be deteriorated by even a trace amount of the residual“impurity”and provides a facile method for the efficient regeneration of graphite anodes.

关键词： Graphite Anode Regeneration Solid electrolyte interphase Spent lithium-ion battery

Targeted regeneration and upcycling of spent graphite by defect‐driven tin nucleation

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Carbon Energy 2024年第4期6卷 91-103页

作者： Zhiheng Cheng Zhiling Luo Hao Zhang Wuxing Zhang Wang Gao Yang Zhang long qie Yonggang Yao Yunhui Huang Kun Kelvin Fu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationDepartment of Materials Science and EngineeringJilin UniversityChangchunChina Electronic Materials Research Laboratory(Key Lab of Education Ministry) School of Electronic and Information Engineeringand Instrumental Analysis CenterXi'an Jiaotong UniversityXi'anChina Department of Mechanical Engineering University of DelawareNewarkUSA

The recycling of spent batteries has become increasingly important owing to their wide applications,abundant raw material supply,and sustainable *** with the degraded cathode,spent anode graphite often has a relatively intact structure with few defects after long ***,most spent graphite is simply burned or discarded due to its limited value and inferior performance on using conventional recycling methods that are complex,have low efficiency,and fail in performance ***,we propose a fast,efficient,and“intelligent”strategy to regenerate and upcycle spent graphite based on defect‐driven targeted *** Sn as a nanoscale healant,we used rapid heating(~50 ms)to enable dynamic Sn droplets to automatically nucleate around the surface defects on the graphite upon cooling owing to strong binding to the defects(~5.84 eV/atom),thus simultaneously achieving Sn dispersion and graphite *** a result,the regenerated graphite showed enhanced capacity and cycle stability(458.9 mAh g^(−1) at 0.2 A g^(−1) after 100 cycles),superior to those of commercial *** from the self‐adaption of Sn dispersion,spent graphite with different degrees of defects can be regenerated to similar structures and *** analysis indicates that targeted regeneration and upcycling have significantly lower energy consumption(~99%reduction)and near‐zero CO_(2) emission,and yield much higher profit than hydrometallurgy,which opens a new avenue for direct upcycling of spend graphite in an efficient,green,and profitable manner for sustainable battery manufacture.

关键词： battery recycling spent graphite targeted regeneration upcycling graphite

Low-Volatile Binder Enables Thermal Shock-Resistant Thin-Film Cathodes for Thermal Batteries

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Energy & Environmental Materials 2024年第4期7卷 126-134页

作者： Yong Xie Yong Cao Xu Zhang Liangping Dong Xiaojiang Liu Yixiu Cui Chao Wang Yanhua Cui Xuyong Feng Hongfa Xiang long qie Laboratory of Electrochemical Power Sources Institute of Electronic EngineeringChina Academy of Engineering PhysicsMianyang 621000China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Manufacturing thin-film components is crucial for achieving high-efficiency and high-power thermal batteries(TBs).However,developing binders with low-gas production at the operating temperature range of TBs(400-550°C)has proven to be a significant ***,we report the use of acrylic acid derivative terpolymer(LA136D)as a low-volatile binder for thin-film cathode fabrication and studied the chain scission and chemical bondbreaking mechanisms in *** is shown LA136D defers to randomchain scission and cross-linking chain scission mechanisms,which gifts it with a low proportion of volatile products(ψ,ψ=39.2 wt%)at even up to 550°C,well below those of the conventional PVDF(77.6 wt%)and SBR(99.2 wt%)***,LA136D contributes to constructing a thermal shock-resistant cathode due to the step-by-step bond-breaking *** is beneficial for the overall performance of *** discharging test,the thin-film cathodes exhibited a remarkable 440%reduction in polarization and 300%enhancement in the utilization efficiency of cathode materials,while with just a slight increase of 0.05 MPa in gas pressure compared with traditional“thick-film”*** work highlights the potential of LA136D as a low-volatile binder for thin-film cathodes and shows the feasibility of manufacturing high-efficiency and high-power TBs through polymer molecule engineering.

关键词： gas production high-power low-volatile binder thermal battery thin-film cathode

Demystifying the Salt‑Induced Li Loss:A Universal Procedure for the Electrolyte Design of Lithium‑Metal Batteries

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Nano-Micro Letters 2023年第12期15卷 310-319页

作者： Zhenglu Zhu Xiaohui Li Xiaoqun Qi Jie Ji Yongsheng Ji Ruining Jiang Chaofan Liang Dan Yang Ze Yang long qie Yunhui Huang State Key Laboratory of Material Processing and Die and Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804People’s Republic of China Institute of Nanoscience and Nanotechnology School of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079People’s Republic of China

Lithium(Li)metal electrodes show significantly different reversibility in the electrolytes with different ***,the understanding on how the salts impact on the Li loss remains ***,using the electrolytes with different salts(e.g.,lithium hexafluorophosphate(LiPF_(6)),lithium difluoro(oxalato)borate(LiDFOB),and lithium bis(fluorosulfonyl)amide(LiFSI))as examples,we decouple the irreversible Li loss(SEI Li^(+)and“dead”Li)during *** is found that the accumulation of both SEI Li^(+)and“dead”Li may be responsible to the irreversible Li loss for the Li metal in the electrolyte with LiPF_(6)*** for the electrolytes with LiDFOB and LiFSI salts,the accumulation of“dead”Li predominates the Li *** also demonstrate that lithium nitrate and fluoroethylene carbonate additives could,respectively,function as the“dead”Li and SEI Li^(+)*** by the above understandings,we propose a universal procedure for the electrolyte design of Li metal batteries(LMBs):(i)decouple and find the main reason for the irreversible Li loss;(ii)add the corresponding electrolyte *** such a Li-loss-targeted strategy,the Li reversibility was significantly enhanced in the electrolytes with 1,2-dimethoxyethane,triethyl phosphate,and tetrahydrofuran *** strategy may broaden the scope of electrolyte design toward practical LMBs.

关键词： Li loss Universal guideline Electrolyte design Li reversibility

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高安全锂离子电池复合集流体的界面强化

物理化学学报 2023年第2期39卷 81-92页

作者：汪茹刘志康严超伽龙黄云辉同济大学材料科学与工程学院上海201804 华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室武汉430074 南京同宁新材料研究院有限公司南京211161 浙江柔震科技有限公司浙江嘉兴314499

面向高能量密度电池的高比容量三元正极材料的应用,使锂离子电池更容易发生热失控,这不仅降低了其安全性,也限制了锂离子电池的进一步发展。如何在提高能量密度的同时保证电池的安全性是亟待解决的问题。以绝缘高分子薄膜为支撑基材,两... 详细信息

面向高能量密度电池的高比容量三元正极材料的应用,使锂离子电池更容易发生热失控,这不仅降低了其安全性,也限制了锂离子电池的进一步发展。如何在提高能量密度的同时保证电池的安全性是亟待解决的问题。以绝缘高分子薄膜为支撑基材,两侧沉积金属层得到了具有夹芯结构的铝复合集流体能有效保证电池在针刺条件下的安全性,且更轻的复合集流体的使用能进一步提高电池能量密度。但高分子基材与铝金属层之间界面结合力较差,这会导致复合集流体在高温电解液浸泡中发生脱层现象,从而影响其在电池中的使用。本研究采用聚对苯二甲酸乙二醇酯(PET)作为支撑基材,通过在铝金属镀层与高分子基材之间引入氧化物中间层,有效地增强了金属与高分子基材之间的界面结合力,提升复合集流体的电解液兼容性。此外,复合集流体良好的机械性能使其能很好地兼容现有的电池制备技术,利用其制备的软包电池表现出与使用传统铝箔为集流体的电池相当的电化学性能。进一步的针刺测试表明,复合集流体能有效阻止锂电池在针刺过程中的热失控,显著改善了电池的安全性能。

关键词：锂离子电池复合集流体界面强化氧化物强化层电解液兼容性

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人工流产对女性心理状况影响的系统分析

中国计划生育学杂志 2016年第1期24卷 11-17页

作者：茅群霞王宏伟吴尚纯国家卫生计生委科学技术研究所北京100081 中国劳动关系学院

目的：利用已发表文献,采用meta分析方法系统分析人工流产对女性心理状况的影响。方法：分别在PubMed采用＂abortion＂和＂mental health＂关键词组合检索英文文献;在CNKI、Sinomed、VIP等数据库,采用＂流产＂和＂心理健康＂关键词组合... 详细信息

目的：利用已发表文献,采用meta分析方法系统分析人工流产对女性心理状况的影响。方法：分别在PubMed采用＂abortion＂和＂mental health＂关键词组合检索英文文献;在CNKI、Sinomed、VIP等数据库,采用＂流产＂和＂心理健康＂关键词组合检索中文文献,限定为中文核心期刊（截止时间为2014年3月29日）;检索所获文章的参考文献。结果：共获英文文献121篇（国外研究）、中文46篇;纳入英文12篇、中文7篇。根据异质性检验结果,分别采用随机和固定效应模型进行meta分析。据10个国外横断面研究,精神相关问题发生风险的合并OR流产者对比未流产者及95%CI为1.74（1.58～1.90）,P〈0.001;据2个国外队列研究,精神相关问题发生风险的合并RR流产者对比未流产者及95%CI为1.33（1.17～1.51）,P〈0．001。据中文文献结果，与常模相比，人工流产人群的症状白评量表（SCL-90）总均分较高，其标准均数差（SMD）及95％CI为：0．10（O．05～0．16），P〈0．001。结论：尽管因国内外研究设计不同而不能直接比较，但国内外人工流产者出现精神症状的风险均较未流产者高，因此，有必要进行适宜干预，降低该人群心理健康问题发生风险。

关键词：人工流产女性心理健康 meta分析

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一种用于密度法的SR插值模型

制造业自动化 2019年第4期41卷 159-163页

作者：刘晓晨孙宇敬石开郄龙飞南京理工大学机械工程学院南京210094 北京理工大学机械与车辆学院北京100029

拓扑优化能够独立于初始设计而获得新颖、优质的结构构型,已经成为结构创新设计的重要手段。SIMP(Simplified Isotropic Material with Penalization)模型和RAMP(Rational Approximation of Material Properties)模型是密度法中的两种常用的材料插值模型,两者均通过惩罚的方式来抑制优化结果中中间密度单元的产生。目前这两种模型处于割裂状态,提出一种SIMP模型和RAMP模型加权的材料插值模型,即SR模型。在SR模型框架下,构建了以机械柔顺度为目标函数,体积约束为约束条件的拓扑优化模型。研究了适用于该优化模型的优化准则求解算法,以及SR模型在不同加权因子取值策略下的惩罚效果。实验结果表明,SR模型具备SIMP模型高效率及RAMP模型高稳定性的特点。

关键词：拓扑优化密度法 SIMP RAMP