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Tailoring Electrode–Electrolyte Interface Using an Electron-Deficient Borate-Based Additive in MgTFSI_(2)-MgCl_(2)/DME Electrolyte for Rechargeable Magnesium Batteries

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Energy & Environmental Materials 2024年第6期7卷 167-175页

作者： Haiyan Fan Xinxin Zhang Jianhua Xiao Wenjie Chen Qiyuan lin Zi Shyun Ng Yitao lin Yi Su ludi Pan Yipeng Su Shuaiyang Ren Haowen liu Xuanzhang li Yuegang Zhang State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China

Rechargeable magnesium metal batteries need an electrolyte that forms a stable and ionically conductive solid electrolyte interphase(SEI)on the ***,we used molecular dynamic simulation,density functional theory calculation,and X-ray photoelectron spectroscopy analysis to investigate the solvation structures and SEI compositions in electrolytes consisting of dual-salts,magnesium bis(trifluoromethanesulfonyl)imide(MgTFSI_(2)),and MgCl_(2),with different additives in 1,2-dimethoxyethane(DME)*** found that the formed[Mg_(3)(μ-Cl)_(4)(DME)mTFSI_(2)](m=3,5)inner-shell solvation clusters in MgTFSI_(2)-MgCl_(2)/DME electrolyte could easily decompose and form a MgO-and MgF_(2)-rich *** electron-rich inorganic species in the SEI,especially MgF_(2),turned out to be detrimental for Mg plating/*** reduce the MgF_(2)and MgO contents in SEI,we introduce an electron-deficient tri(2,2,2-trifluoroethyl)borate(TFEB)additive in the ***//Mg cells using the MgTFSI_(2)-MgCl_(2)/DME-TFEB electrolyte could cycle stably for over 400 h with a small polarization voltage of~150 *** with the presence of 800 ppm H_(2)O,the electrolyte with TFEB additive could still preserve its good electrochemical *** optimized electrolyte also enabled stable cycling and high-rate capability for Mg//Mo6S8 and Mg//CuS full cells,showing great potential for future applications.

关键词： electrolyte additives interfacial chemistry magnesium metal batteries solvation structure

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Unraveling Shuttle Effect and Suppression Strategy in lithium/Sulfur Cells by In Situ/Operando X-ray Absorption Spectroscopic Characterization

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Energy & Environmental Materials 2021年第2期4卷 222-228页

作者： Lujie Jia Jian Wang Shuaiyang Ren Guoxi Ren Xiang Jin licheng Kao Xuefei Feng Feipeng Yang Qi Wang ludi Pan Qingtian li Yi-sheng liu Yang Wu Gao liu Jun Feng Shoushan Fan Yifan Ye Jinghua Guo Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Advanced light Source and Energy Storage and Distributed Resources DivisionLawrence Berkeley National LaboratoryBerkeley CA 94720USA i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China CAS Center for Excellence in Superconducting Electronics State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China 不详

The polysulfides shuttle effect represents a great challenge in achieving high capacity and long lifespan of lithium/sulfur(li/S)cells.A comprehensive understanding of the shuttle-related sulfur speciation and diffusion process is vital for addressing this ***,we employed in situ/operando X-ray absorption spectroscopy(XAS)to trace the migration of polysulfides across the li/S cells by precisely monitoring the sulfur chemical speciation at the cathodic electrolyte-separator and electrolyte-anode interfaces,respectively,in a real-time *** we adopted a shuttle-suppressing strategy by introducing an electrocatalytic layer of twinborn bismuth sulfide/bismuth oxide nanoclusters in a carbon matrix(BSOC),we found the li/S cell showed greatly improved sulfur utilization and longer life *** operando S Kedge XAS results revealed that the BSOC modification was bi-functional:trapping polysulfides and catalyzing conversion of sulfur species *** elucidated that the polysulfide trapping-and-catalyzing effect of the BSOC electrocatalytic layer resulted in an effective lithium anode *** results could offer potential stratagem for designing more advanced li/S cells.

关键词： in situ/operando lithium/sulfur cell shuttle effect sulfur speciation X-ray absorption spectroscopy

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A flexible artificial solid-electrolyte interlayer supported by compactness-tailored carbon nanotube network for dendrite-free lithium metal anode

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Journal of Energy Chemistry 2022年第6期31卷 421-427,I0012页

作者： Haowen liu Jifang Zhang Yang liu Yang Wei Shuaiyang Ren ludi Pan Yi Su Jianhua Xiao Haiyan Fan Yitao lin Yipeng Su Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

A dendrite-free lithium metal anode requires a stable interface designed for efficient and reversible lithium plating and stripping. In this work, we have devised a mechanically flexible artificial li_(3)N solid-electrolyte interlayer supported by a dual-layer compactness-tailored carbon nanotube fiber network. The more compact side of the network ensures a full coverage of li_(3)N, which prevents the reaction between electrolyte and lithium. The other side, with sparsely distributed nanotube fibers, provides mechanical flexibility for the film, and induces three-dimensional lithium deposition along its structure without any dendrite formation. The resulting full cell with NCM811 cathode has a high capacity retention of 95.1% for 160 cycles compared with less than 80% for the control.

关键词： lithium metal anode Artificial SEI CNT network 3D deposition

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The role of Kv7.4 and Kir3.2 channels in regulation of the excitability of NAc-projecting VTA DA neurons

The role of Kv7.4 and Kir3.2 channels in regulation of the e...

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中国神经科学学会第十二届全国学术会议

作者： Min Su Jing Wang li li ludi Zhang Chen Zhao Hailin Zhang Department of Pharmacology Hebei Medical University

Objective Kv7/KCNQ and G protein-gated inwardly rectifying potassium(Kir3/GIRK) channels are regulators of neuronal excitability in the brain, and Kv7.4 and Kir3.2 channels are both expressed in the VTA DA neurons. Previous studies found Kir3.2 currents generated in most medial NAc-projecting dopamine neurons. Our previous data showed Kv7.4 played a key role in the inhibition of VTA DA neuron excitability. Yet, the role of Kv7.4 in regulation of the excitability of NAc-projecting VTA DA neurons has not been elucidated. The aim is to investigate the role of Kv7.4 and Kir3.2 channels in regulation of NAc-projecting VTA DA neuronal excitability of mice and find out which one is more important. Methods(1) Retrobeads were injected bilaterally in nucleus accumbens core(NAc core) of WT, Kv7.4and Kir3.2mice.(2) Immunofluroscence technique was used to observe the expression of Kv7.4 and Kir3.2 channels on NAc-projecting VTA DA neurons.(3) Cell-attached patch clamp technique was used to record the neuronal excitability in the brain slice of mice.(4) Single-cell PCR was used to identify VTA DA neurons. Results(1) Retrobeads injected in vivo to identify the projection target of individual DA neurons, immunofluroscence data showed that DA neurons projecting to NAc core were predominantly located both in the medial paranigral(PN) nucleus and the adjacent medio ventral aspects of theparabrachial(PBP) nucleus. Retrogradely identified neurons were co-labeled with Kv7.4 and Kir3.2 antibody.(2) After application of 20 μM dopamine, about 65% retrograded neurons had a complete and stable cessation of spontaneous electrical activity in WT mice. However, in Kv7.4-/-and Kir 3.2-/-mice, approximately 50% and 30% neurons were completely suppressed respectively.(3) The single-cell PCR data revealed approximately 80% retrogradely labeled neurons were immune-positive for DAT, indicating that they were dopaminergic neurons. Conclusion(1) Most of the NAc-projecting VTA neurons are dopamine neuron

关键词： Kir3.2 channel Kv7.4 channel NAc-projecting VTA DA neuron

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Tailoring Mg^(2+)Solvation Structure in a Facile All-Inorganic[Mg_(x)li_(y)Cl2_(x+y)·nTHF]Complex Electrolyte for High Rate and Long Cycle-life Mg Battery

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Energy & Environmental Materials 2023年第2期6卷 152-158页

作者： Haiyan Fan Xinxin Zhang Yuxing Zhao Jianhua Xiao Hua Yuan Guang Wang Yitao lin Jifang Zhang ludi Pan Ting Pan Yang liu Yuegang Zhang State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China

A high-performance all-inorganic magnesium-lithium chloride complex(MLCC)electrolyte is synthesized by a simple room-temperature reaction of liCl with MgCl_(2) in tetrahydrofuran(THF)*** dynamics simulation,density functional theory calculation,Raman spectroscopy,and nuclear magnetic resonance spectroscopy reveal that the formation of[Mg_(x)li_(y)Cl_(2x+y)·nTHF]complex solvation structure significantly lowers the coordination number of THF in the first solvation sheath of Mg^(2+),which significantly enhances its de-solvation *** MLCC electrolyte presents a stable electrochemical window up to 3.1 V(vs Mg/Mg^(2+))and enables reversible cycling of Mg metal deposition/stripping with an outstanding Coulombic efficiency up to 99%at current densities as high as 10 mA cm^(-2).Utilizing the MLCC electrolyte,a Mg/Mo_(6)S_(8) full cell can be cycled for over 10000 cycles with a superior capacity retention of 85 mA h g^(-1) under an ultrahigh rate of 50 C(1 C=128.8 mA g^(-1)).The facile synthesis of highperformance MLCC electrolyte provides a promising solution for future practical magnesium batteries.

关键词： cycle life electrolyte Mg battery solvation structure

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Chinese Cultural Soft Power Research:Based on li Ziqi Case

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Management Studies 2023年第5期11卷 262-269页

作者： ZHANG Sheng ZHANG ludi ZHANG Sijia Shanghai Academy of Social Sciences ShanghaiChina Xiangming Junior Middle School ShanghaiChina Qingdao University QingdaoChina

The purpose of this research is about the soft power of Chinese culture,taking li Ziqi as a *** Ziqi’s videos has been recognized and appreciated by the government for its shaping of China’s national image in the cultural dimension,judging from the attitude of official media such as People’s Daily and CCTV to its *** also explores more possibilities for shaping its national image and presents a more diversified,richer,and wonderful ***“high-speed rail”,“China C919 Plane”,and other aspects,li Ziqi is also a manifestation of China’s cultural soft power.

关键词： cultural soft power li Ziqi China story

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One-pot synthesis of hierarchical CoS/NC@MoS/C hollow nanofibers based on one-dimensional metal coordination polymers for enhanced lithium and sodium-ion storage

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Science Bulletin 2020年第17期65卷 1460-1469,M0003,M0004页

作者： Yanzi Wang Wanyi Xie Dongzhi li Pei Han ludi Shi Yuanyi Luo Guangtao Cong Cuihua li Jiali Yu Caizhen Zhu Jian Xu Institute of Low-dimensional Materials Genome Initiative College of Chemistry and Environmental Engineering of Shenzhen UniversityShenzhen 518060China

Multicomponent metal sulfides have been recognized as promising anode materials for lithium/sodiumion storage given their enticing theoretical capacities. However, the simplification of synthetic processes and the construction of heterogeneous interfaces of multimetal sulfides remain great challenges. Herein,a hierarchical 1T-MoS2/carbon nanosheet decorated Co1–xS/N-doped carbon(Co1–xS/NC@MoS2/C) hollow nanofiber was designed and constructed via a one-pot hydrothermal method using a cobalt-based coordination polymer nanofiber. This nanofiber can transform in-situ into conductive N-doped carbon hollow fibers embedded with active Co1–xS nanoparticles, enabling the epitaxial growth of MoS2 ***, the Co1–xS/NC@MoS2/C composites achieve exceptional lithium/sodium-ion storage performance. Compared to MoS2/C microspheres and Co1–xS/NC hollow nanofibers alone, the Co1–xS/NC@MoS2/C hollow nanofibers deliver higher discharge capacities(1085.9 mAh g^-1 for lithium-ion batteries(liBs) and 748.5 mAh g^-1 for sodium-ion batteries(SIBs) at 100 mA g^-1), better capacity retention(910 mAh g^-1 for liBs and 636.5 mAh g^-1 for SIBs after 150 cycles at 100 mA g^-1), and increased cycling stability(407.2 mAh g^-1 after 1000 cycles for SIBs at 1000 m A g^-1). Furthermore, the kinetic analysis shows that the lithium/sodium-ion storage processes of the Co1–xS/NC@MoS2/C electrode are mainly controlled by pseudocapacitance behavior. The excellent electrochemical properties can thus be ascribed to the synergy of the MoS2/C nanosheets with the enlarged interlayer spacing, good conductivity of the carbon layers, and the Co1–xS nanoparticles embedded in the hollow nanofibers with extensive reaction sites.

关键词： Coordination polymer nanofiber Metallic sulfides Hierarchical hollow architecture One-pot synthesis lithium/sodium-ion storage

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神经网络架构轻量化搜索的飞行器控制律自学习方法

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宇航学报 2024年第5期45卷 762-769页

作者：王昭磊王露荻路坤锋禹春梅李晓敏林平宇航智能控制技术全国重点实验室北京100854 北京航天自动控制研究所北京100854

针对在运用Soft actor-critic(SAC)强化学习算法实现复杂的飞行器控制律自学习过程中,超参数设定高度依赖于人工经验进而造成设计难度大的问题,提出一种基于神经网络架构轻量化搜索策略的飞行器控制律自学习方法。该方法在将神经网络架... 详细信息

针对在运用Soft actor-critic(SAC)强化学习算法实现复杂的飞行器控制律自学习过程中,超参数设定高度依赖于人工经验进而造成设计难度大的问题,提出一种基于神经网络架构轻量化搜索策略的飞行器控制律自学习方法。该方法在将神经网络架构设计问题转化为图拓扑生成问题的基础上,结合LSTM循环神经网络的图拓扑生成算法、基于权重共享的深度强化学习参数轻量化训练与评估机制,以及基于策略梯度的图拓扑生成器参数学习算法,给出了一种面向深度强化学习的轻量化自动搜索框架,实现了SAC训练算法中神经网络架构超参数的自动优化,进而完成了控制律的自学习。以三维空间返回着陆控制为例,验证了所提方法的有效性和实用性。

关键词：飞行器控制律自学习自动机器学习网络架构搜索 SAC强化学习

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纳米SiO_2在低熔点熔盐中的分散对其比热容的影响

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北京工业大学学报 2016年第8期42卷 1259-1264页

作者：吴玉庭张璐迪马重芳李英北京工业大学传热强化与过程节能教育部重点实验室北京100124 北京工业大学传热与能源利用北京市重点实验室北京100124

为提高低熔点熔盐Ca(NO3 )2 鄄KNO3 鄄NaNO3 鄄liNO3 的比热容,采用超声振荡法将低熔点熔盐与30 nm 的SiO2 纳米粒子复合制备出低熔点熔盐纳米流体,研究了纳米粒子对低熔点盐比热容的影响及制备过程中影响纳米粒子分散的关键因素:超声... 详细信息

为提高低熔点熔盐Ca(NO3 )2 鄄KNO3 鄄NaNO3 鄄liNO3 的比热容,采用超声振荡法将低熔点熔盐与30 nm 的SiO2 纳米粒子复合制备出低熔点熔盐纳米流体,研究了纳米粒子对低熔点盐比热容的影响及制备过程中影响纳米粒子分散的关键因素:超声振荡时间和超声振荡频率. 采用同步热分析仪(DSC)测量熔盐比热容;采用扫描电镜表征低熔点熔盐纳米流体的微观表面结构,观察纳米粒子分布情况. 研究结果表明:分散均匀的SiO2 纳米粒子可以提高低熔点盐纳米流体的比热容,纳米熔盐比热容平均值达到1郾86 J/ (g·K)左右,在200 ~ 350 益温度范围内,比热容提高率为14% ~22%,并通过实验验证了超声波分散法是制备熔盐纳米流体的一种稳定可靠的方法.

关键词：熔盐纳米流体超声振荡比热容温度频率

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习近平文化思想的内涵及在高校思想政治教育中的研究意义

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黑河学院学报 2024年第10期15卷 96-98页

作者：赵璐迪李俊东北林业大学马克思主义学院黑龙江哈尔滨150040

习近平文化思想是当代中国优秀传统文化与现代文化相融合的产物,高校大学生作为践行习近平文化思想的中坚力量,应该将这一思想内化于心、外化于行。习近平文化思想融入高校思想政治教育,能够推动社会主义核心价值观落地生根,实现德智体... 详细信息

习近平文化思想是当代中国优秀传统文化与现代文化相融合的产物,高校大学生作为践行习近平文化思想的中坚力量,应该将这一思想内化于心、外化于行。习近平文化思想融入高校思想政治教育,能够推动社会主义核心价值观落地生根,实现德智体美劳全面发展的教育目标,帮助大学生形成正确的世界观和价值观,对此高校要做好课程内容规划和创新教学方法,构建促进习近平文化思想实践的校园文化生态系统,营造学术氛围推进教育目标的实现,使新时代大学生成为文化强国的建设者。

关键词：习近平文化思想高校思想政治教育新时代中国特色社会主义理论

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