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Boosting rate performance of layered lithium-rich cathode materials by oxygen vacancy induced surface multicomponent integration

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Journal of Energy Chemistry 2024年第5期92卷 250-262页

作者： Youyou Fang Yuefeng Su jinyang dong Jiayu Zhao Haoyu Wang Yun Lu Bin Zhang Hua Yan Feng Wu Lai Chen Beijing Key Laboratory of Environmental Science and Engineering School of Material Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Chongqing Innovation Center Beijing Institute of TechnologyChongqing 401120China Yibin Libode New Materials Co. Ltd.Yibin 64400SichuanChina 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

The rapid development of electric vehicles and portable energy storage systems demands improvements in the energy density and cost-effectiveness of lithium-ion batteries,a domain in which Lithium-rich layered cathode(LLO)materials inherently excel.However,these materials face practical challenges,such as low initial Coulombic efficiency,inferior cycle/rate performance,and voltage decline during cycling,which limit practical application.Our study introduces a surface multi-component integration strategy that incorporates oxygen vacancies into the pristine LLO material Li1.2Mn_(0.6)Ni_(0.2)O_(2).This process involves a brief citric acid treatment followed by calcination,aiming to explore rate-dependent degradation behavior.The induced surface oxygen vacancies can reduce surface oxygen partial pressure and diminish the generation of O_(2)and other highly reactive oxygen species on the surface,thereby facilitating the activation of Li ions trapped in tetrahedral sites while overcoming transport barriers.Additionally,the formation of a spinel-like phase with 3D Li+diffusion channels significantly improves Li^(+)diffusion kinetics and stabilizes the surface structure.The optimally modified sample boasts a discharge capacity of 299.5 mA h g^(-1)at a 0.1 C and 251.6 mA h g^(-1)at a 1 C during the initial activation cycle,with an impressive capacity of 222.1 mA h g^(-1)at a 5 C.Most notably,it retained nearly 70%of its capacity after 300 cycles at this elevated rate.This straightforward,effective,and highly viable modification strategy provides a crucial resolution for overcoming challenges associated with LLO materials,making them more suitable for practical application.

关键词： Lithium-ion battery Layered lithium rich cathode Surface multicomponent integration Rate-dependent degradation and Li^(+) diffusion kinetics

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Sensitive humidity sensor based on moisture-driven energy generation

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Nano Research 2024年第6期17卷 5578-5586页

作者： Qingchao Ni Qing Lou Chenglong Shen Guangsong Zheng Runwei Song Jingnan Hao Jialu Liu jinyang Zhu Jinhao Zang Lin dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials and School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The emergence of novel self-powered humidity sensors has attracted considerable attention in the fields of smart electronic devices and personal healthcare.Herein,self-powered humidity sensors have been fabricated using a moisture-driven energy generation(MEG)device based on asymmetric tubular graphitic carbon nitride(g-CN)films prepared on anodized aluminum(AAO)template.At a relative humidity(RH)of 96%,the MEG device can provide an open-circuit voltage of 0.47 V and a short-circuit current of 3.51μA,with a maximum output power of 0.08μW.With inherent self-powered ability and humidity response via current variation,an extraordinary response of 1.78×106%(41%-96%RH)can be gained from the MEG device.The possible power generation mechanism is that g-CN/AAO heterostructure can form ion gradient and diffusion under the action of moisture to convert chemical potential into electrical potential,evoking a connaturally sensitive response to humidity.Self-powered respiration monitoring device based on the sensor is designed to monitor human movement(sitting,warming up,and running)and sleep status(normal,snoring,and apnea),maintaining excellent stability during cumulative 12-h respiration monitoring.This self-powered humidity sensing technology has promising potential for extensive integration into smart electronic and round-the-clock health monitoring devices.

关键词： graphitic carbon nitride moisture-driven energy generation humidity sensor respiration monitoring

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Recent Advances in Atomic-scale Storage Mechanism Studies of Two-dimensional Nanomaterials for Rechargeable Batteries Beyond Li-ion

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Chemical Research in Chinese Universities 2020年第4期36卷 560-583页

作者： PAN Lu dong jinyang YI Ding YANG Yijun WANG Xi Department of Physics School of ScienceBeijing Jiaotong UniversityBeijing 100044P.R.China Chemistry ami Chemical Engineering Guangdong Laboratory Shantou 515031P.R.China Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081P.R.China

Developing new types of rechargeable batteries with high energy densities and low cost have received in creasing attentions,aiming to reduce the dependence on high-priced lithium.Bevond Li-ion batteries,the potential alternatives including Na-ion batteries,Li-S batteries and Li-air batteries have been investigated recently,which are required to be viable for commercial applications.From this point of view,to understand the electrochemical reaction mechanisms and kinetics of these batteries has become the key challenge to make breakthroughs in the field of new energy storage.In this review,we present a critical overview of the two dimensional nanomaterials-based batteries(except Li-ion-based batteries)that could meet such demonds.To develop new energy storage devices with more promising performances,the microstructure evolution and atomic scale storage mechanism of these batteries are comprehensively summarized.In addition,the major challenges and opportunities of advanced characterization techniques are finally discussed.We do hope that this review will give the readers a clear and profound understanding of the electrochemical reaction mechanisms and kinetics of the as-discussed batteries.thus effectively contributing to the smart design of future-generation energy storage devices.

关键词： Two dimensional(2D)nanomaterial Batteries beyond Li ion In sinu technique Atomic-level Storage mechanism and kinetics

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船舶操纵运动建模方法研究进展与展望

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船舶工程 2024年第2期46卷 I0010-I0022页

作者：宋俊龙张靖扬董磊楼建坤王鸿东上海交通大学海洋智能装备与系统教育部重点实验室上海200240

建立精确的船舶操纵运动模型,是保障智能船舶自主航行和测试验证的关键。当前,船舶操纵运动建模方法主要为构建数学模型,并采用系统辨识法计算模型中的水动力系数。随着人工智能技术的发展,黑箱模型和灰箱模型也逐渐被用于船舶操纵运动... 详细信息

建立精确的船舶操纵运动模型,是保障智能船舶自主航行和测试验证的关键。当前,船舶操纵运动建模方法主要为构建数学模型,并采用系统辨识法计算模型中的水动力系数。随着人工智能技术的发展,黑箱模型和灰箱模型也逐渐被用于船舶操纵运动建模。文章分别针对白箱模型和黑箱模型的关键技术研究现状进行梳理,总结当前操纵运动建模面临的六自由度耦合、模型迁移适用性、实测数据获取与构造等3个问题,并提出对应的3点展望:开展船舶六自由度耦合运动建模,结合先验知识的模型结构设计,船舶操纵试验设计及数据集构造。

关键词：六自由度耦合黑箱模型系统辨识船舶操纵

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Light-activated arginine-rich peptide-modified nanoparticles for deep-penetrating chemo-photo-immunotherapy of solid tumor

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Nano Research 2023年第7期16卷 9804-9814页

作者： Yonghua Gong jinyang Zhang Yan Lu dong Wan Jie Pan Guilei Ma Key Laboratory of Biomaterials and Nanotechnology for Cancer Immunotherapy The Tianjin Key Laboratory of BiomaterialsInstitute of Biomedical EngineeringPeking Union Medical College&Chinese Academy of Medical SciencesTianjin 300192China School of Environmental and Chemical Engineering Tiangong UniversityTianjin 300387China

Poor permeation of drugs and“immune-cold”tumor microenvironment in solid tumors are the two major challenges which lead to the inefficient therapeutic efficacy for cancer treatment.Here,light-activated penetrable nanoparticles(PEGVAL&DOX&ICG@RNPs)for co-delivery of the chemotherapeutic drug doxorubicin(DOX),the photosensitizer agent indocyanine green(ICG),and the angiotensin II receptor blockers valsartan(VAL)were developed to achieve deep drug penetration and synergistic photo-chemo-immunotherapy of solid tumor.Studies showed that under the first-wave of laser irradiation,the polyethylene glycol(PEG)hydrophilic layer as an“inert”surface could detach from the nanoparticles,release VAL and expose the arginine-rich peptide modified-cores that can facilitate deep drug penetration via a transcytosis pathway.When exposed to the second-wave of laser irradiation,the synergistic chemo-photo-immunotherapy can be achieved.As expected,in 4T1 tumorbearing mice,PEG-VAL&DOX&ICG@RNPs treatment could effectively inhibit the growth of tumors,down-regulateα-smooth muscle actin expression level of cancer-associated fibroblasts cells in tumors,induce dendritic cells(DCs)maturation,and promote intratumoral infiltration of cytotoxic T lymphocytes.Moreover,combination therapy by PEG-VAL&DOX&ICG@RNPs and anti-PD-1 monoclonal antibody can elicit memory T cell response for preventing tumor recurrence and metastasis in vivo.This work provides a promising delivery strategy to overcome the current limitations of nanomedicine for achieving more effective therapeutic index of“immune-cold”solid tumor treatment.

关键词： light-activated nanoparticles transcytosis deep penetration chemo-photo-immunotherapy solid tumor

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增温对若尔盖高寒草本沼泽木里薹草氮磷重吸收的影响

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生态学杂志 2024年第1期43卷 25-32页

作者：陈天松胡昭佚申金阳赵丽刘宏强熊银洪孙荣卿董李勤张昆西南林业大学地理与生态旅游学院昆明650224 西南林业大学湿地学院国家高原湿地研究中心昆明650224 云南省水利水电勘测设计研究院昆明650021 国家林业和草原局西南生态文明研究中心昆明650224

养分重吸收是植物重要的营养保存机制和养分循环的重要组成部分,温度变化会影响植物养分吸收。为了探讨若尔盖高原沼泽湿地植物木里薹(Carex muliensis)草养分重吸收特征对气候变暖的响应,本研究通过野外模拟增温实验,测定木里薹草成熟... 详细信息

养分重吸收是植物重要的营养保存机制和养分循环的重要组成部分,温度变化会影响植物养分吸收。为了探讨若尔盖高原沼泽湿地植物木里薹(Carex muliensis)草养分重吸收特征对气候变暖的响应,本研究通过野外模拟增温实验,测定木里薹草成熟叶片和衰老叶片的氮(N)、磷(P)含量并分析其重吸收效率差异。结果表明:木里薹草叶片N、P含量均值分别为11.44和1.19 mg·g^(-1),N重吸收效率(NRE)、P重吸收效率(PRE)均值分别为61.8%和69.0%,增温显著降低了成熟叶片氮含量,显著提高了衰老叶片磷含量(P<0.01),对成熟叶片磷含量和衰老叶片氮含量没有显著影响;增温显著降低了成熟叶片和衰老叶片N∶P(P<0.01)及NRE(P<0.05)和PRE(P<0.01);木里薹草叶片氮磷重吸收效率与成熟叶片氮磷含量呈显著正相关,与衰老叶片氮磷含量呈显著负相关;木里薹草生长受P限制,而增温可能导致限制情况发生变化,木里薹草叶片养分重吸收还可能受到化学计量调控。研究结果将有助于了解和预测若尔盖高原养分循环对未来气候变化的响应,并为气候变暖下高寒草本沼泽植物养分重吸收效率变化的预测提供数据支持和实验证据。

关键词：重吸收效率氮磷含量木里薹草增温

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配糟对清香型白酒发酵中环境因子及微生物群落的影响

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微生物学通报 2024年第2期51卷 554-572页

作者：唐洁阮松林斌陈前锦杜栋夏金阳江威杨生智杨强陈申习劲牌有限公司劲牌研究院中药保健食品质量与安全湖北省重点实验室湖北黄石435100

【背景】环境因子是影响微生物生长代谢的重要因素,解析半开放条件下酿造过程中环境因子对微生物群落演替的作用对于清香型白酒生产调控具有重要意义。配糟在白酒发酵过程中起着调节发酵速度的作用,其对微生物群落组成变化的影响尚不明... 详细信息

【背景】环境因子是影响微生物生长代谢的重要因素,解析半开放条件下酿造过程中环境因子对微生物群落演替的作用对于清香型白酒生产调控具有重要意义。配糟在白酒发酵过程中起着调节发酵速度的作用,其对微生物群落组成变化的影响尚不明确。【目的】揭示使用不同发酵周期配糟对清香型白酒发酵过程中环境因子及微生物群落演替的影响。【方法】采用PacBio测序平台和多元统计分析比较使用2种配糟酒醅中微生物群落结构组成,结合蒙特卡洛置换检验明确环境因子对微生物群落的影响。【结果】与使用正常发酵周期配糟酒醅相比,使用延长发酵周期配糟酒醅水分较低,而酸度、氨基酸态氮、总游离氨基酸、还原糖和残余淀粉较高;微生物多样性和丰富度分析发现,使用延长发酵周期配糟酒醅中细菌α多样性极显著高于使用正常发酵周期配糟酒醅(P<0.001),而真菌α多样性显著/极显著低于使用正常发酵周期配糟酒醅(P<0.05, P<0.001);通过组间差异性分析发现,细菌群落共产生28个差异指示种,而真菌群落共产生15个差异指示种;水分、酸度、氨基酸态氮、还原糖、残余淀粉和总游离氨基酸对微生物群落结构的影响显著(P<0.05),其中水分、酸度、氨基酸态氮和总游离氨基酸与使用延长发酵周期配糟酒醅微生物群落密切相关,还原糖和残余淀粉是使用正常发酵周期配糟酒醅微生物群落演替的主要驱动因素。【结论】本研究揭示了使用不同发酵周期配糟的清香型白酒发酵过程中环境因子对微生物群落组装的驱动作用,为清香型白酒的可控发酵提供了理论基础。

关键词：清香型白酒配糟环境因子高通量测序微生物群落

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基于残差连接的水下小目标检测结构模型

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江苏海洋大学学报（自然科学版） 2024年第1期33卷 58-65页

作者：杨淼董金耐谢卓冉蔡立鹏钟锦扬江苏海洋大学电子工程学院江苏连云港222005 江苏海洋大学海洋工程学院江苏连云港222005

由于水下成像距离较远,现有的水下图像目标检测数据集中存在大量小目标,水下小目标特征信息和语义信息少,目前常用的目标检测算法直接应用于水下检测时小目标漏检错检率较高。水下目标检测预处理阶段通常采用图像增强算法来提升图像观... 详细信息

由于水下成像距离较远,现有的水下图像目标检测数据集中存在大量小目标,水下小目标特征信息和语义信息少,目前常用的目标检测算法直接应用于水下检测时小目标漏检错检率较高。水下目标检测预处理阶段通常采用图像增强算法来提升图像观感质量,并以此提升小目标检测精度,但图像增强的数据预处理操作容易导致小目标特征丢失,小目标检测性能下降。提出了一种基于残差连接的水下小目标检测结构模型,讨论了图像增强提升目标检测性能的应用方式,通过残差连接将增强算法与目标检测算法联合优化,避免了过度增强导致的特征丢失问题,提升了水下小目标检测精度。所提出的算法在DUO数据集上进行了实验,实验结果表明,相较于YOLOv7,该算法对小目标检测精度提升了7.2%。在两个水下数据集上进行消融实验,验证了所提出的残差连接的方式对于提升小目标检测性能具有促进作用。

关键词：小目标检测图像增强残差连接联合训练

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Urea-assisted mixed gas treatment on Li-Rich layered oxide with enhanced electrochemical performance

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Journal of Energy Chemistry 2022年第3期31卷 123-132,I0005页

作者： Liying Bao Lei Wei Nuoting Fu jinyang dong Lai Chen Yuefeng Su Ning Li Yun Lu Yongjian Li Shi Chen Feng Wu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing Key Laboratory of Environmental Science and EngineeringBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China School of Automation Beijing Institute of TechnologyBeijing 100081China

Lithium-rich manganese-based oxides(LRMOs)have been considered as one of the most promising cathode materials owing to their superior specific capacity and high operating voltage.However,their largescale commercial applications are limited due to problems such as structural instability,voltage decay,and poor cycle stability.Herein,pre-generated oxygen vacancies and oxygen-deficient phase were introduced to Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)(LMNO)using a facile urea-assisted mixed gas treatment(UMGT)method for facilitating electronic and ionic conductivity,reducing the surface oxygen partial pressure,and suppressing the release of lattice oxygen.Compared with the pristine LMNO material,the UMGT sample modified at 200℃exhibited enhanced discharge capacity,capacity retention,and rate capability.In addition,the Li+diffusion coefficient significantly improved by 50%than that of the reference LMNO.More importantly,the voltage decay was effectively suppressed,with average potential decreasing from 0.53 V(LMNO)to 0.39 V(UMGT-200)after 200 cycles at 1 C.The proposed UMGT method provides an effective strategy to alleviate the phase transition and improve the electrochemical performance for lithium-rich materials,and identifies a promising research direction to inhibit the voltage decay of layered anion redox cathode materials.

关键词： Lithium-rich oxides Pre-generated oxygen vacancies Oxygen-deficient Voltage decay

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基于电子鼻和电子舌技术分析不同产地肉豆蔻气味特征研究

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环球中医药 2024年第6期17卷 1055-1064页

作者：胡锦阳朱小玲孙国园王玥璇张雪妮董玉内蒙古医科大学药学院呼和浩特010110 内蒙古自治区蒙药药效物质与质量控制工程技术研究中心内蒙古自治区国际蒙医医院药学部

目的基于电子鼻和电子舌技术分析不同产地肉豆蔻药材气味特征和化学成分之间的关系。方法通过电子鼻和电子舌技术对不同产地肉豆蔻气味响应值进行主成分分析、Loading分析和线性判别分析,结合柠檬烯、萜品烯、薄荷醇、黄樟醚、甲基丁... 详细信息

目的基于电子鼻和电子舌技术分析不同产地肉豆蔻药材气味特征和化学成分之间的关系。方法通过电子鼻和电子舌技术对不同产地肉豆蔻气味响应值进行主成分分析、Loading分析和线性判别分析,结合柠檬烯、萜品烯、薄荷醇、黄樟醚、甲基丁香酚5种化学成分的味觉值绘制成分与味觉之间的回归分析图,利用气相色谱测定不同产地肉豆蔻挥发油中柠檬烯、萜品烯、薄荷醇、黄樟醚、甲基丁香酚5种化学成分含量,判断化学成分含量差异对不同产地肉豆蔻味觉值的影响。结果主成分分析可以显著区分不同产地肉豆蔻,线性判别分析中个别地区有重叠现象。味觉分析系统显示肉豆蔻在酸味、苦味、涩味上有明显的地区性差异,甲基丁香酚对酸味影响最强,萜品烯对涩味影响最强。结合不同产地肉豆蔻药材中柠檬烯、萜品烯、薄荷醇、黄樟醚、甲基丁香酚5种化学成分含量,得出总含量与酸味、苦味、涩味均呈现正向相关。结论电子鼻、电子舌的气味分析技术可以有效区分不同产地肉豆蔻药材气味特征,结合5种化学成分含量发现,化学成分不同种类及量的变化对肉豆蔻药材气味性状会产生影响,为药材性状鉴别提供了一种新颖且科学可靠的技术手段。

关键词：肉豆蔻气味差异挥发性成分电子鼻技术电子舌技术

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