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Cation-doped liNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode with high rate performance

Chinese Journal of Chemical Engineering 2024年第6期70卷 139-148页

作者： Long Zhang Dongsheng Yang lilei Miao Chunmeng Zhang jiexiang li Jiawei Wen Chunxia Wang Tiantian Cao Guoyong Huang Shengming Xu College of New Energy and Materials China University of PetroleumBeijing 102249China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of PetroleumBeijing 102249China Beijing Spacecrafts Beijing 100094China SINOPEC Sales Co. Ltd.Beijing 100728China SINOPEC Research Institute of Petroleum Processing Co. LtdBeijing 100083China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Beijing Key Laboratary of Fine Ceramics Tsinghua UniversityBeijing 100084China

The nickel-rich layered cathode material liNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)has high energy density,lower cost and is a promising cathode material currently under ***,its electrochemical and structural stability is poor during *** the many modification methods,cation doping has been consistently proven to be an effective strategy for enhancing electrochemical ***,the NCM811 cathode material was modified by solid-phase reactions with Mg and Al *** addition,the corresponding mechanism of NCM811 cathode material-doped modification is explored by density functional theory(DFT)calculations,and we have extended this approach to other ternary cathode materials with different ratios and obtained universal *** with DFT calculations,the results show that Mg2+occupies the li+site and reduces the degree of li^(+)/Ni^(2+) mixture;Al^(3+) acts as a structural support during charging and discharging to prevent structural *** electrochemical properties were tested by an electrochemical workstation and the LAND system,and the results showed that the capacity retention rate increased to varying degrees from 63.66%to 69.87%and 89.05%for NCM811-Mg and NCM811-Al at room temperature after 300 cycles,*** study provides a theoretical basis and design strategy for commercializing cationic-doped modification of nickel-rich cathode materials.

关键词： li-ion batteries Cathode materials Doped Electrochemical properties DFT calculation

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Effects of Al and Co doping on the structural stability and high temperature cycling performance of liNi_(0.5)Mn_(1.5)O_(4) spinel cathode materials

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Chinese Journal of Chemical Engineering 2023年第9期61卷 201-209页

作者： Jianfeng Cheng Meixuan li Yutong Wang jiexiang li Jiawei Wen Chunxia Wang Guoyong Huang College of New Energy and Materials China University of Petroleum(Beijing)Beijing 102249China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(Beijing)Beijing 102249China

The poor structural stability and capacity retention of the high-voltage spinel-type liNi_(0.5)Mn_(1.5)O_(4)(LNMO)limits their further ***,Al and Co were doped in LNMO materials for a more stable structure and *** LNMO,liNi_(0.45)Al_(0.05)Mn_(1.5)O_(4)(LNAMO)and liNi_(0.45)Co_(0.05)Mn_(1.5)O_(4)(LNCMO)were synthesized by calcination at 900℃ for 8 h,which was called as solid-phase method and applied universally in ***,FT-IR and CV test results showed the synthesized samples have cation disordering Fd-3m space group ***,the incorporation of Al and Co increased the cation disordering of LNMO,thereby increasing the transfer rate of li+.The SEM results showed that the doped samples performed more regular and *** EDS elemental analysis confirmed the uniform distribution of each metal element in the ***,the doped samples showed better electrochemical properties than undoped *** LNAMO and LNCMO samples were discharged with specific capacities of 116.3 mA·h·g^(-1)and 122.8 mA·h·g^(-1)at 1 C charge/discharge rate with good capacity retention of 95.8% and 94.8% after 200 cycles at room temperature,*** capacity fading phenomenon of the doped samples at 50℃ and 1 C rate was significantly ***,cations doping also enhanced the rate performance,especially for the LNCMO,the discharge specific capacity of 117.9 mA·h·g^(-1)can be obtained at a rate of 5 C.

关键词： High voltage spinel Al/Co doping High temperature cycling stability

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Strain‑Induced Surface Interface Dual Polarization Constructs PML‑Cu/Bi_(12)O_(17)Br_(2) High‑Density Active Sites for CO_(2) Photoreduction

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Nano-Micro Letters 2024年第5期16卷 169-183页

作者： Yi Zhang Fangyu Guo Jun Di Keke Wang Molly Meng‑Jung li Jiayu Dai Yuanbin She jiexiang Xia Huaming li School of Chemistry and Chemical Engineering Institute for Energy ResearchSchool of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013People’s Republic of China State Key Laboratory Breeding Base of Green Chemistry‑Synthesis Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014People’s Republic of China College of Science and Hunan Key Laboratory of Extreme Matter and ApplicationsNational University of Defense TechnologyChangsha 410073People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomHong KongPeople’s Republic of China School of Chemistry and Chemical Engineering National Special Superfine Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094People’s Republic of China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal UniversityJinhua 321004People’s Republic of China

The insufficient active sites and slow interfacial charge trans-fer of photocatalysts restrict the efficiency of CO_(2) *** synchronized modulation of the above key issues is demanding and ***,strain-induced strategy is developed to construct the Bi–O-bonded interface in Cu porphyrin-based monoatomic layer(PML-Cu)and Bi_(12)O_(17)Br_(2)(BOB),which triggers the surface interface dual polarization of PML-Cu/BOB(PBOB).In this multi-step polarization,the built-in electric field formed between the interfaces induces the electron transfer from con-duction band(CB)of BOB to CB of PML-Cu and suppresses its reverse ***,the surface polarization of PML-Cu further promotes the electron converge in Cu *** introduction of PML-Cu endows a high density of dispersed Cu active sites on the surface of PBOB,significantly promoting the adsorption and activation of CO_(2) and CO *** conversion rate of CO_(2) photoreduction to CO for PBOB can reach 584.3μmol g-1,which is 7.83 times higher than BOB and 20.01 times than *** work offers valuable insights into multi-step polarization regulation and active site design for catalysts.

关键词： Bi_(12)O_(17)Br_(2) Porphyrin CO_(2)photoreduction Polarization Active sites

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In-situ embedded ultrafine Bi_(12)O_(17)Br_(2)nanotubes in MOF-derived hierarchical porous carbon for enhanced photocatalytic CO_(2)conversion to CO

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Journal of Materials Science & Technology 2024年第4期171卷 47-53页

作者： Xing Sun Mengxia Ji Yi Zhang Qingzeng Xing Zihan liu Nianhua liu Emmanuel Nkudede Huaming li Sheng Yin jiexiang Xia School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu UniversityZhenjiang 212013China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Provincial Key Laboratory of Resources Chemistry of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 81008China

Increasing the utilization efficiency of photogenerated electrons is highly recognized as one of the ef-ficient approaches to boost the photocatalytic CO_(2)conversion ***,ZIF-67-derived porous carbon(PC)material was employed for the construction of PC@ultrafine Bi_(12)O_(17)Br_(2)nanotubes(PC@BOB NTs)composites through a facile solvothermal synthesis in order to optimize the use of excited elec-trons in the BOB *** characterization results revealed that the introduction of PC material achieved a faster charge separation rate in the PC@BOB composites,ensuring more photogener-ated electrons participate in the CO_(2)adsorption and activation ***,the pore structures of ZIF-67-derived PC material provided abundant confined spaces for the enrichment of CO_(2)***-ter 5 h of Xenon lamp irradiation,PC@BOB composites exhibited obviously increased photocatalytic CO_(2)reduction activity in the pure *** the addition amount of PC was 5 wt%,the PC@BOB-2 com-posite showed the highest CO evolution rate of 359.70μmol/g,which was 2.95 times higher than that of the pure BOB *** work provides some independent insights into the applications of Metal-Organic Framework(MOF)-derived hierarchical porous structures to strengthen the CO_(2)enrichment,as well as the excited charge utilization efficiency,thus achieving a high solar-to-fuel conversion efficiency.

关键词： Bi_(12)O_(17)Br_(2)nanotubes Hierarchical porous structure CO_(2)enrichment Charge separation CO_(2)photoreduction

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Engineering of oxygen vacancy and bismuth cluster assisted ultrathin Bi_(12)O_(17)Cl_(2)nanosheets with efficient and selective photoreduction of CO_(2)to CO

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Carbon Energy 2024年第4期6卷 1-11页

作者： Meili Guan Ni Lu Xuan Zhang Qiuwan Wang Jian Bao Guiye Chen Hao Yu Huaming li jiexiang Xia Xuezhong Gong College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdaoShandongChina Institute for Energy Research Jiangsu UniversityZhenjiangJiangsuChina National Center of International Joint Research for Hybrid Materials Technology Institute of Hybrid MaterialsCollege of Materials Science andEngineeringNational Base of International Science and Technology Cooperation on Hybrid MaterialsQingdao UniversityQingdaoShandongChina

The photocatalytic conversion of CO_(2)into solar‐powered fuels is viewed as a forward‐looking strategy to address energy scarcity and global *** work demonstrated the selective photoreduction of CO_(2)to CO using ultrathin Bi_(12)O_(17)Cl_(2)nanosheets decorated with hydrothermally synthesized bismuth clusters and oxygen vacancies(OVs).The characterizations revealed that the coexistences of OVs and Bi clusters generated in situ contributed to the high efficiency of CO_(2)–CO conversion(64.3μmol g^(−1)h^(−1))and perfect *** OVs on the facet(001)of the ultrathin Bi_(12)O_(17)Cl_(2)nanosheets serve as sites for CO_(2)adsorption and activation sites,capturing photoexcited electrons and prolonging light absorption due to defect *** addition,the Bi‐cluster generated in situ offers the ability to trap holes and the surface plasmonic resonance *** study offers great potential for the construction of semiconductor hybrids as multiphotocatalysts,capable of being used for the elimination and conversion of CO_(2)in terms of energy and environment.

关键词： Bi cluster Bi_(12)O_(17)Cl_(2)nanosheet oxygen vacancy photocatalytic CO_(2)reduction

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Estimation of reservoir temperature using silica and cationic solutes geothermometers:a case study in the Tengchong geothermal area

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Chinese Journal Of Geochemistry 2015年第2期34卷 233-240页

作者： Xiaobo Zhang Qinghai Guo jiexiang li Mingliang liu Yanxin Wang Yijun Yang School of Environmental Studies & State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

Reservoir temperature estimation is vitally important for assessing the exploitation potential of a geothermal *** this study,the concentrations of major chemical constituents in geothermal water sampled from boiling and hot springs in the Tengchong hydrothermal area were measured,and quartz and cationic solutes geothermometers were used to calculate subsurface ***(Q/K) diagrams and Na-K-Mg triangular diagrams were applied to evaluating the equilibrium status of geothermal water samples with regard to reservoir minerals,and results were used to select suitable *** results show that samples RH01,RH03,RH04,RH05,and LL16 were in or very close to full equilibrium with the selected minerals,and therefore a NaK geothermometer is appropriate.A K/Mg geothermometer,however,is applicable to LP08 and PZH18 whose chemical compositions adjusted to the shallow reservoir temperatures during their re-equilibrium *** contrast,cationic solute geothermometers are unsuitable for SQ20 and RH07,which are categorized as immature water in the Na-K-Mg diagram;a quartz geothermometer was adopted to evaluate the corresponding subsurface temperatures of these *** to the reservoir temperature estimation made in this study,there is at least one high-temperature reservoir below Rehai with a possible temperature range of 210-270 ℃.

关键词：温度采样地热区阳离子地温溶质腾冲储层地质温度计

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A Permutation Test for Unit Root in an Autoregressive Model

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Applied Mathematics 2013年第12期4卷 1629-1634页

作者： jiexiang li Lanh Tran Sa-aat Niwitpong Department of Applied Statistics King Mongkut’s University of Technology Bangkok Thailand Department of Mathematics College of Charleston Charleston USA Department of Statistics Indiana University Bloomington USA

A permutation test (based on a finite random sample of permutations) for unit root in an autoregressive process is considered. The test can easily be carried out in practice and the proposed permutation test is neither limited to large sample sizes nor normal white noises. Simulations show that the power of the permutation test is reasonable when sample sizes are small or when the white noises have a heavy tailed distribution. The test is shown to be consistent.

关键词： Permutation Test Autoregressive Nonstationary

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城市污水管网有毒有害气体检测技术研究

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水利水电技术（中英文） 2022年第S1期53卷 358-360页

作者：旷小军李节祥刘奇中国安能集团第二工程局有限公司江西南昌330096

污水管网人工清淤检测是一种重要且常规的手段,污水中有机物被分解、氧化或还原产生的气体带有较大毒性。为确保项目中井下作业人员的安全,依照相关行业规范与现有研究成果,通过现场实施与研究,总结出了下井作业安全规范工序流程,确定... 详细信息

污水管网人工清淤检测是一种重要且常规的手段,污水中有机物被分解、氧化或还原产生的气体带有较大毒性。为确保项目中井下作业人员的安全,依照相关行业规范与现有研究成果,通过现场实施与研究,总结出了下井作业安全规范工序流程,确定了合理施工人员和机具布置,并制定了针对性保障措施,以期对城市污水管网有限空间作业提供技术参考。

关键词：有限空间有毒有害气体气体检测保障措施城市污水管网

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高温地热系统中粘土矿物形成对Na-K和K-Mg地球化学温标准确性的影响

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地球科学（中国地质大学学报） 2017年第1期42卷 142-154页

作者：李洁祥郭清海余正艳中国地质大学生物地质与环境地质国家重点实验室湖北武汉430074 中国地质大学环境学院湖北武汉430074

传统地球化学温标在估算高温地热系统内浅层热储温度(一般为100~200℃)时存在局限性,其中应用广泛的Na-K温标和K-Mg温标出现误差的原因仍不清楚.在收集了全球代表性热田内采自地热井的201个流体样品的水文地球化学数据后,利用软件WATCH... 详细信息

传统地球化学温标在估算高温地热系统内浅层热储温度(一般为100~200℃)时存在局限性,其中应用广泛的Na-K温标和K-Mg温标出现误差的原因仍不清楚.在收集了全球代表性热田内采自地热井的201个流体样品的水文地球化学数据后,利用软件WATCH将井口流体地球化学数据还原为热储条件下的对应值;在此基础上,对Na-K温标和K-Mg温标进行了评价,发现钾长石和常见富钾双八面体粘土矿物均可能对浅层热储内地热流体中的钾含量产生影响,富镁双八面体粘土矿物也可达到与地热流体的平衡,而地热流体中钠含量则受水-岩相互作用的影响很小.因此,浅层地热流体的Na-K比值与热储温度不具有对应关系,而K-Mg温标在计算浅层热储温度时虽然具有一定指示意义,但仍无法得到足够准确的结果.

关键词：高温地热系统浅层热储 Na-K温标 K-Mg温标双八面体粘土矿物水文地质

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高温热田深部母地热流体的温度计算及其升流后经历的冷却过程:以腾冲热海热田为例

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地球科学（中国地质大学学报） 2015年第9期40卷 1576-1584页

作者：李洁祥郭清海王焰新中国地质大学环境学院湖北武汉430074

高温地热系统中赋存着大量的地热能资源.为了进一步了解高温地热系统,以腾冲热海热田为典型研究区,利用热泉地球化学组成,基于多种地球化学模型确定了热田深部母地热流体的温度,并分析了其升流后经历的不同冷却过程.热海热田的硫磺塘水... 详细信息

高温地热系统中赋存着大量的地热能资源.为了进一步了解高温地热系统,以腾冲热海热田为典型研究区,利用热泉地球化学组成,基于多种地球化学模型确定了热田深部母地热流体的温度,并分析了其升流后经历的不同冷却过程.热海热田的硫磺塘水热区和热水塘水热区所排泄的热泉源自共同的深部热储,该热储中母地热流体的Cl-质量浓度为265mg/L,温度为336℃.在热海热田,母地热流体在经历绝热冷却过程后直接形成了泉口温度最高的大滚锅泉,而其他中性泉均由母地热流体先与浅部地下冷水混合再经历绝热冷却形成.母地热流体的深部热储之上存在多个温度在200℃以上的热储,这些热储的形成受控于热海地区发育的多组方向不同的断裂.

关键词：母地热流体绝热冷却混合热储温度热海热田热泉地球化学

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