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High energy density in ultra-thick and flexible electrodes enabled by designed conductive agent/binder composite

Journal of Energy Chemistry 2024年第3期90卷 133-143,I0005页

作者： Xiaoyu Shen Hailong Yu Liubin Ben Wenwu Zhao Qiyu Wang Guanjun Cen Ronghan Qiao Yida Wu xuejie huang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808Guangdong China

Thick electrodes can increase incorporation of active electrode materials by diminishing the proportion of inactive constituents,improving the overall energy density of ***,thick electrodes fabricated using the conventional slurry casting approach frequently exhibit an exacerbated accumulation of carbon additives and binders on their surfaces,invariably leading to compromised electrochemical *** this study,we introduce a designed conductive agent/binder composite synthesized from carbon nanotube and *** agent/binder composite facilitates production of dry-process-prepared ultra-thick electrodes endowed with a three-dimensional and uniformly distributed percolative architecture,ensuring superior electronic conductivity and remarkable mechanical *** this approach,ultra-thick LiCoO_(2)(LCO) electrodes demonstrated superior cycling performance and rate capabilities,registering an impressive loading capacity of up to 101.4 mg/cm^(2),signifying a 242% increase in battery energy *** another analytical endeavor,time-of-flight secondary ion mass spectroscopy was used to clarify the distribution of cathode electrolyte interphase(CEI) in cycled LCO *** results provide unprecedented evidence explaining the intricate correlation between CEI generation and carbon distribution,highlighting the intrinsic advantages of the proposed dry-process approach in fine-tu ning the CEI,with excellent cycling performance in batteries equipped with ultra-thick electrodes.

关键词： Conductive agent/binder composite Dry process Ultra-thick electrodes High energy density CEI reconstruction ToF-SIMS

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Seasonal variation of melatonin secretion across various segments of the gastrointestinal tract in rats

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Journal of Traditional Chinese Medical Sciences 2024年第3期11卷 275-282页

作者： Yuxin Zhang xuejie huang Yilu Peng Yuxi Liang Wenjing Zhang Yadong Cui Xiaoying Xu Xiuhua Hu Xiaoyan Liu School of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijing 102488China School of Traditional Chinese Medicine Hebei UniversityBaoding 071000China School of Life Sciences Beijing University of Chinese MedicineBeijing 102488China

Objective To investigate whether melatonin(MT)secretion in different parts of the gastrointestinal tract(GIT)exhibits seasonal variations and its correlation with immune *** Sixty Sprague-Dawley rats were divided into control and model groups,and the pineal gland was removed in the model ***,jejunum,ileum,and colon tissues were obtained during the spring equinox,summer solstice,beginning of autumn,autumn equinox,and winter *** levels of MT,MT receptors(MR),arylalkylamine N-acetyltransferase(AANAT),hydroxyindole-O-methyltransferase(HIOMT),interleukin-2(IL-2),and interleukin-10(IL-10)in the GIT were measured using enzyme-linked immunosorbent *** Except for the stomach,the jejunum,ileum,and the colon showed seasonal tendencies in MT *** the control group,MT secretion in the jejunum and ileum was the highest in the long summer,and colonic MT secretion was the highest in *** the model group,MT levels in the colon were highest in the *** seasonal rhythms of the MR,AANAT,HIOMT,IL-2,and IL-10 in the colon were roughly similar to those of MT,and changed accordingly after *** Gastrointestinal MT secretion is related to seasonal changes,and MT secretion in each intestinal segment is influenced by different *** biological effects of MT in the gut are inextricably linked to the mediation of MR,and a hormone-receptor linkage exists between MT and *** effect of seasonal changes on the gastrointestinal immune system may be mediated through the regulation of seasonal secretion of MT.

关键词： Melatonin Seasonal variations Pineal gland Gastrointestinal tract Melatonin receptors

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Silicon-based nanosheets synthesized by a topochemical reaction for use as anodes for lithium ion batteries

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Nano Research 2015年第8期8卷 2654-2662页

作者： Kaiqi Xu Liubin Ben Hong Li xuejie huang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 1 O0190 China

Silicon is the most promising anode material for the next generation high- performance lithium ion batteries. However, its commercial application is hindered by its poor performance due to the huge volume change during cycling. Although two-dimensional silicon-based materials show significantly improved performance, flexible synthesis of such materials is still a challenge. In this work, silicon-based nanosheets with a multilayer structure are synthesized for the first time by a topochemical reaction. The morphology and oxidation state of these nanosheets can be controlled by appropriate choice of reaction media and oxidants. Benefiting from the hierarchical structure and ultrathin size, when the silicon-based nanosheets are employed as anodes they exhibit a charge （delithiation） capacity of 800 mAh/g after 50 cycles with a maximum coulombic efficiency of 99.4% and good rate performance （647 mAh/g at 1 A/g）. This work demonstrates a novel method for preparing nanosheets not only for lithium ion batteries but also having various potential applications in other fields, such as catalysts, electronics and photonics.

关键词： anode materials lithium ion batteries nanosheets silicon topochemical reaction

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Improving the rate capability of a SiOx/graphite anode by adding LiNO3

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Progress in Natural Science:Materials International 2020年第3期30卷 321-327页

作者： Wenbin Qi Liubin Ben Hailong Yu Wenwu Zhao Guangjin Zhao xuejie huang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences State Grid Henan Electric Power Research Institute Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Songshan Lake Mat Lab

SiO/graphite anodes have attracted considerable attention in recent years due to their high specific ***,a thick solid-electrolyte-interface,which is produced by the decomposition of carbonate-based electrolytes,impedes the diffusion of lithium ions and significantly limits the rate performance of this interesting anode for practical *** this work,a LiNOadditive was introduced during the preparation of an anode electrode *** results of SEM,ex and in situ XRD and XPS showed that LiNOdecomposed into LiNOand LiN,which deposited on the anode surface during the first discharge *** to the high ionic conductivity of LiNOand LiN,the rate performance of the SiO/graphite anode was significantly improved,showing a specific capacity nearly three times higher than that without the *** addition,the decomposition of the electrolyte during cycling was also suppressed by the LiNOand LiN inorganic salts because of their low electronic conductivity and superior *** approach is facile and easy to scale up,which will be of great significance for the commercialization of SiO/graphite anodes.

关键词： Lithium ion batteries SiOx/graphite Anode LiNO3 XPS

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A facile method to synthesize 3D structured Sn anode material with excellent electrochemical performance for lithium-ion batteries

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Progress in Natural Science:Materials International 2020年第4期30卷 456-460页

作者： Zhou Jin Liubin Ben Hailong Yu Wenwu Zhao xuejie huang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Songshan Lake Mat Lab

Sn anode materials with high specific capacity are an appealing alternative to graphite for next-generation advanced lithium-ion batteries. However, poor electrochemical performance originating from fracture and pulverization due to the enormous volume changes during lithium alloying/dealloying hinders their commercial applications. Here, we propose the synthesis of a novel 3D structured Sn anode material by a facile method: heat treatment of nanosized SnO2spheres in a tube furnace with a flowing mixed atmosphere of C2H2/Ar at 400 °C. After the heat treatment, the nanosized SnO2spheres convert into pure Sn bulk material(～20 μm), which consists of Sn nanowires(～50 nm in diameter and several microns in length). This unique 3D structure with sufficient voids between the nanowires effectively mitigates the volume expansion of Sn bulk material and ensures good electrical contact between the anode material and conducting additives. As a consequence, the 3D structured Sn anode material exhibits a specific reversible capacity of ～600 m A h/g and no significant capacity degradation(compared with that of the 20 th cycle) over 500 cycles at 0.2 C.

关键词： LI-ION NEGATIVE ELECTRODES ALLOY ANODE NANOPARTICLES GRAPHENE TIN LITHIATION STORAGE STEP

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从漏刻角度浅谈运气学说时间系统

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中华中医药杂志 2024年第2期39卷 645-648页

作者：裴枫刘晓燕邰雪莉崔亚东张玉鑫黄雪杰北京中医药大学中医学院北京100029

文章从《素问·六微旨大论》原文漏刻角度出发,对漏刻起源、漏刻计时原理、汉代时辰制划分、时刻制形成的本末始终以及医家们对六气交司时刻的注解进行梳理考察。最终明晰,运气学说时间系统更重视漏刻制计时,其与汉代《黄帝内经》中的... 详细信息

文章从《素问·六微旨大论》原文漏刻角度出发,对漏刻起源、漏刻计时原理、汉代时辰制划分、时刻制形成的本末始终以及医家们对六气交司时刻的注解进行梳理考察。最终明晰,运气学说时间系统更重视漏刻制计时,其与汉代《黄帝内经》中的十六时段并行计时,唐代及以后医家对六气交司时刻的注释均基于南北朝后发展的时刻制。

关键词：运气学说《黄帝内经》《六微旨大论》漏刻制时刻制六气交司时刻时间系统

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基于“脾应长夏”的胃肠激素季节变化与松果腺褪黑素的相关性研究

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世界中医药 2024年第5期19卷 623-626页

作者：梁羽茜张兆国张文静黄雪杰刘晓燕北京中医药大学中医学院北京100029 北京中医药大学房山医院北京102499

目的:观察大鼠血清褪黑素(MT)、胃泌素(GAS)及胃动素(MTL)五季中的含量变化,探讨胃肠动力的季节变化与松果腺褪黑素的相关性,揭示“脾应长夏”内涵。方法:在春、夏、长夏、秋及冬季分批饲养SD雄性大鼠,每一季节中的大鼠随机分为对照组(... 详细信息

目的:观察大鼠血清褪黑素(MT)、胃泌素(GAS)及胃动素(MTL)五季中的含量变化,探讨胃肠动力的季节变化与松果腺褪黑素的相关性,揭示“脾应长夏”内涵。方法:在春、夏、长夏、秋及冬季分批饲养SD雄性大鼠,每一季节中的大鼠随机分为对照组(不做任何处理)和模型组(行松果腺摘除术)。饲养至节气点时间春分、夏至、立秋前1 d、秋分及冬至取材,酶联免疫吸附测定法(ELISA法)检测血清中MT、GAS和MTL含量。结果:春、夏、长夏、秋、冬五季中对照组血清MT、GAS及MTL分泌存在季节性变化节律,均在长夏季节含量最低。松果腺摘除后,模型组中五季血清MT、GAS及MTL分泌的季节性变化节律发生改变,但各指标含量仍在长夏季节最低。长夏季节GAS及MTL分泌与褪黑素具有一致性。结论:胃肠消化系统的功能与中医脾藏象理论密切相关,松果腺褪黑素调节下的胃肠动力的季节变化为中医“脾应长夏”理论生理机制的研究提供了依据。

关键词：松果腺褪黑素五季脾应长夏胃泌素胃动素胃肠动力季节变化

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A designed core-shell structural composite of lithium terephthalate coating on Li4Ti5O12 as anode for lithium ion batteries

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Progress in Natural Science:Materials International 2016年第4期26卷 368-374页

作者： Yong Yan Liubin Ben Yuanjie Zhan Yanyan Liu Yi Jin Suijun Wang xuejie huang Key Laboratory for Renewable Energy Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences China Electric Power Research Institute

A core-shell structural composite was synthesized with lithium terephthalate（Li2C8H4O4） coated on spinel Li4Ti5O12（LTO）. The composite displays a capacity of about 200 mA h g-1and a good rate capability with two charge/discharge platforms at ~ 1.55 and ~ 0.8 V. The excellent cycling performance of the composite is attributed to the successful combination of high cycling stability of LTO and high specific capacity of Li2C8H4O4. In addition, an interesting phenomena is observed for the first time for this composite which is that lithium ions transfer between LTO and Li2C8H4O4at a fast speed. This is investigated in details via the asymmetric charge/discharge measurement and cyclic voltammogram（CV）.The LTO/Li2C8H4O4composite may have potential applications to be used as an anode material for the electric vehicle batteries, which is shallowly charged/discharged at ordinary times using the charge/discharge platform of LTO and fully charged/discharged at emergency to release the extra high capacity from Li2C8H4O4.

关键词： Lithium ion batteries LTO Organic anode Composite Li-ion transfer

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Si nanoparticles seeded in carbon-coated Sn nanowires as an anode for high-energy and high-rate lithium-ion batteries

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Materials Futures 2022年第1期1卷 113-121页

作者： Liubin Ben Jin Zhou Hongxiang Ji Hailong Yu Wenwu Zhao xuejie huang Songshan Lake Materials Laboratory Dongguan 523808Guangdong ProvincePeople’s Republic of China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

High-capacity and high-rate anode materials are desperately desired for applications in the next generation lithium-ion ***,we report preparation of an anode showing a structure of Si nanoparticles wrapped inside Sn *** anode inherits the advantages of both Si and Sn,endowing lithiation/delithiation of Si nanoparticles inside the conducting networks of Sn *** demonstrates a high and reversible capacity of∼1500 mAh g−1 over 300 cycles at 0.2℃ and a good rate capability(0.2℃–5℃)equivalent to *** excellent cycling performance is attributed to the novel structure of the anode as well as the strong mechanical strength of the nanowires which is directly confirmed by in-situ lithiation and bending experiments.

关键词： anode Si Sn nanowire electrochemical cycling

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Electrochemical properties and interfacial reactions of LiNi0.5Mn1.5O4-δ nanorods

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Progress in Natural Science:Materials International 2012年第3期22卷 207-212页

作者： Liping Wang, Hong Li, xuejie huang Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Institute of Physics Chinese Academy of Sciences Beijing 100190 China

LiNi0.5Mn1.5O4-δ which possesses a high voltage of 4.7 V vs. Lit/Li and stable structure has been considered as a promising cathode material for high energy Li-ion batteries. In this study, well-crystallized LiNi0.5Mn1.5O4-δ nanorods with diameter of ～50 nm and length of ～500 nm were synthesized by a hydrothermal-solid state process followed by a lithiation reaction. It delivers ～120 mA h-g 1 discharge capacity under 30 mA g-1 at 3.5-4.9 V, and 90 mA h g-1 at 150 mA g-1. An unstable solid electrolyte interphase (SEI) film with thickness 2-10 nm was observed by transmission electron microscopy. The thick and unstable SEI layers are responsible for its low rate performance and low coulombic efficiency during cycling.

关键词： Lithium ion battery High voltage spinel Nanorods Surface reaction

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