锂离子电池(LIBs)在低温条件下会出现阻抗增大、嵌入/脱嵌锂不平衡、循环效率降低、容量衰减等现象,导致充电比放电更加困难,严重影响了LIBs的低温性能,其中对LIBs低温性能影响最大的是电解液。电解液在低温下黏度变大,与电极材料和隔...锂离子电池(LIBs)在低温条件下会出现阻抗增大、嵌入/脱嵌锂不平衡、循环效率降低、容量衰减等现象,导致充电比放电更加困难,严重影响了LIBs的低温性能,其中对LIBs低温性能影响最大的是电解液。电解液在低温下黏度变大,与电极材料和隔膜之间的相容性变差,导致离子电导率降低,电荷转移电阻增大,最终导致电池性能下降。本文基于web of science核心合集数据库对LIBs用低温电解液有关文献进行可视化图谱分析。利用CiteSpace分析后可知,低温电解液的研究经历可分为三个阶段:起步阶段、平稳阶段和快速发展阶段。研究力量主要集中在中国、美国、日本、德国等国家,中国逐渐成为科研的核心力量。各个国家、科研机构之间的合作越来越密切,越来越多的科研人员参与到研究中来。目前开发新型低温电解液主要有两条路线:①设计低黏度、高离子电导率的多元电解液,辅以功能添加剂来提升低温性能;②通过研究SEI膜的界面结构和性质,设计高扩散系数的电极材料增大Li+在低温下的迁移率以此提升低温性能。除此以外,未来固体电解质的突破有可能彻底解决LIBs低温性能不良的问题。与此同时,结合计算材料科学可以加速研发过程,有助于产学研的深度融合。展开更多
固态电解质具备高能量密度、高容量、高安全性等特点被认为是理想的电解质材料。无机固态电解质具有较高的离子电导率和力学性能,但其与电极间阻抗高、接触差;聚合物固态电解质有良好的柔性和可加工性,但离子电导率远远达不到应用要求...固态电解质具备高能量密度、高容量、高安全性等特点被认为是理想的电解质材料。无机固态电解质具有较高的离子电导率和力学性能,但其与电极间阻抗高、接触差;聚合物固态电解质有良好的柔性和可加工性,但离子电导率远远达不到应用要求。有机-无机复合电解质兼备两者的优点,是目前最适用于应用推广的材料之一,但在离子电导率和电化学稳定性方面还差强人意。本文基于Web of Science核心合集数据库回顾了近30年关于有机-无机复合电解质的相关文献,利用CiteSpace对相关数据进行了可视化整理。并针对复合电解质发展过程的重要节点和近5年的研究热点进行了深入分析。结果发现目前复合电解质方向研究热度正处于指数上升阶段;复合电解质的最新研究聚焦于凝胶态、单离子导体结构和聚碳酸酯基材料等方向;界面是复合电解质研究的关键问题,是近五年突现强度最高的关键词。关于下阶段复合电解质的开发要围绕:①半固态复合电解质的材料选择和结构设计;②电解质内部相间界面结构和传输机理的研究;③电解质与电极间构建稳定的弹性SEI/CEI膜。展开更多
The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity are increased, and the costs are decreased. The process par...The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity are increased, and the costs are decreased. The process parameters of relay production lines are studied based on the long-and-short-term memory network. Then, the Keras deep learning framework is utilized to build up a short-term relay quality prediction algorithm for the semi-finished product. A simulation model is used to study prediction algorithm. The simulation results show that the average prediction absolute error of the fraction is less than 5%. This work displays great application potential in the relay production lines.展开更多
Newly developed Al2O3-Si3N4 composite refractories used for blast furnace is introduced in this work. Al2O3-Si3N4 composite refractories attacked by alkali vapor and blast furnace slag was investigated. High performan...Newly developed Al2O3-Si3N4 composite refractories used for blast furnace is introduced in this work. Al2O3-Si3N4 composite refractories attacked by alkali vapor and blast furnace slag was investigated. High performance Al2O3-Si3N4 composite refractories was produced and used at both 2560m^3 blast furnaces of Tan-gsteel and No. 5 blast furnace of Shaosteel.展开更多
Low-creep andalusite bricks are characterized by high refractoriness under load, good anti-creep property, high mechanical strength, low porosity, good thermal shock resistance, etc. In this study, low-creep andalusit...Low-creep andalusite bricks are characterized by high refractoriness under load, good anti-creep property, high mechanical strength, low porosity, good thermal shock resistance, etc. In this study, low-creep andalusite brick specimens were investigated in the lab using mullite, bauxite and andalusite. Andalusite with the different particle sizes were used in the experiment and the specimen with the best property was selected us the production standard. In addition, the industrial produced low-creep andalusite bricks were compared with other low-creep bricks. The results show that the developed low-creep andalusite bricks is an excellent material for hot blast stove.展开更多
文摘锂离子电池(LIBs)在低温条件下会出现阻抗增大、嵌入/脱嵌锂不平衡、循环效率降低、容量衰减等现象,导致充电比放电更加困难,严重影响了LIBs的低温性能,其中对LIBs低温性能影响最大的是电解液。电解液在低温下黏度变大,与电极材料和隔膜之间的相容性变差,导致离子电导率降低,电荷转移电阻增大,最终导致电池性能下降。本文基于web of science核心合集数据库对LIBs用低温电解液有关文献进行可视化图谱分析。利用CiteSpace分析后可知,低温电解液的研究经历可分为三个阶段:起步阶段、平稳阶段和快速发展阶段。研究力量主要集中在中国、美国、日本、德国等国家,中国逐渐成为科研的核心力量。各个国家、科研机构之间的合作越来越密切,越来越多的科研人员参与到研究中来。目前开发新型低温电解液主要有两条路线:①设计低黏度、高离子电导率的多元电解液,辅以功能添加剂来提升低温性能;②通过研究SEI膜的界面结构和性质,设计高扩散系数的电极材料增大Li+在低温下的迁移率以此提升低温性能。除此以外,未来固体电解质的突破有可能彻底解决LIBs低温性能不良的问题。与此同时,结合计算材料科学可以加速研发过程,有助于产学研的深度融合。
文摘固态电解质具备高能量密度、高容量、高安全性等特点被认为是理想的电解质材料。无机固态电解质具有较高的离子电导率和力学性能,但其与电极间阻抗高、接触差;聚合物固态电解质有良好的柔性和可加工性,但离子电导率远远达不到应用要求。有机-无机复合电解质兼备两者的优点,是目前最适用于应用推广的材料之一,但在离子电导率和电化学稳定性方面还差强人意。本文基于Web of Science核心合集数据库回顾了近30年关于有机-无机复合电解质的相关文献,利用CiteSpace对相关数据进行了可视化整理。并针对复合电解质发展过程的重要节点和近5年的研究热点进行了深入分析。结果发现目前复合电解质方向研究热度正处于指数上升阶段;复合电解质的最新研究聚焦于凝胶态、单离子导体结构和聚碳酸酯基材料等方向;界面是复合电解质研究的关键问题,是近五年突现强度最高的关键词。关于下阶段复合电解质的开发要围绕:①半固态复合电解质的材料选择和结构设计;②电解质内部相间界面结构和传输机理的研究;③电解质与电极间构建稳定的弹性SEI/CEI膜。
基金funded by Fujian Science and Technology Key Project(No.2016H6022,2018J01099,2017H0037)
文摘The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity are increased, and the costs are decreased. The process parameters of relay production lines are studied based on the long-and-short-term memory network. Then, the Keras deep learning framework is utilized to build up a short-term relay quality prediction algorithm for the semi-finished product. A simulation model is used to study prediction algorithm. The simulation results show that the average prediction absolute error of the fraction is less than 5%. This work displays great application potential in the relay production lines.
文摘Newly developed Al2O3-Si3N4 composite refractories used for blast furnace is introduced in this work. Al2O3-Si3N4 composite refractories attacked by alkali vapor and blast furnace slag was investigated. High performance Al2O3-Si3N4 composite refractories was produced and used at both 2560m^3 blast furnaces of Tan-gsteel and No. 5 blast furnace of Shaosteel.
文摘Low-creep andalusite bricks are characterized by high refractoriness under load, good anti-creep property, high mechanical strength, low porosity, good thermal shock resistance, etc. In this study, low-creep andalusite brick specimens were investigated in the lab using mullite, bauxite and andalusite. Andalusite with the different particle sizes were used in the experiment and the specimen with the best property was selected us the production standard. In addition, the industrial produced low-creep andalusite bricks were compared with other low-creep bricks. The results show that the developed low-creep andalusite bricks is an excellent material for hot blast stove.
