Science China-Materials
·
2017
·Vol. 60
·期 4
·304-314
·
IF 3.956
Zhu Kunlei,Sun Yinghui,Wang Rongming,Shan Zhongqiang,Liu Kai
High-tap density electrode materials are greatly desired for Li-ion batteries with high volumetric capacities to fulfill the growing demands of electric vehicles and portable smart devices. TiO 2 , which is one of the most attractive anode materials, is limited in their application for Li-ion batteries because of its low tap density (usually <1 g cm −3 ) and volumetric capacity. Herein, we report uniform mesoporous TiO 2 submicrospheres with a tap density as high as 1.62 g cm −3 as a promising anode material. Even with a high mass loading of 24 mg cm −2 , the TiO 2 submicrospheres have impressive volumetric capacities that are more than double those of their counterparts. Moreover, they can be synthesized with ~100% yield and within a reaction time of ~6 h by optimizing the experimental conditions and formation mechanism, exhibiting potential for large-scale production for industrial applications. Other mesoporous anode materials, i.e., high-tap density mesoporous Li 4 Ti 5 O 12 submicrospheres, are fabricated using the generalizedmethod. We believe that our work provides a significant reference for the industrial production of mesoporous materials for Li-ion batteries with a high volumetric performance.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机合成
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2018
·Vol. 61
·期 8
·1057-1066
·
IF 4.318
Huang Zhen-Dong,Zhang Ting-Ting,Lu Hao,Yang Jike,Bai Ling,Chen Yuehua,Yang Xu-Sheng,Liu Rui-Qing,Lin Xiu-Jing,Li Yi,Li Pan,Liu Xianming,Feng Xiao-Miao,Ma Yan-Wen
Durability, rate capability, capacity and tap density are paramount performance metrics for promising anode materials, especially for sodium ion batteries. Herein, a carbon free mesoporous CoTiO 3 micro-prism with a high tap density (1.8 g cm −3 ) is newly developed by using a novel Co-Ti-bimetal organic framework (BMOF) as precursor. It is also interesting to find that the Co-Ti-BMOF derived carbon-free mesoporous CoTiO 3 micro-prisms deliver a superior stable and more powerful Na + storage than other similar reported titania, titanate and their carbon composites. Its achieved capacity retention ratio for 2,000 cycles is up to 90.1% at 5 A g −1 .
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Qian Lin,Yujing Sha,Bote Zhao,Yubo Chen,Moses O. Tadé,Zongping Shao
Cobalt oxides are attractive alternative anode materials for next-generation lithium-ion batteries (LIBs). To improve the performance of conversion-type anode materials such as cobalt oxides, well dispersed and nanosized particulate morphology is typically required. In this study, we describe the in situ electrochemical generation of cobalt oxide nanosheets from commercial micrometer-sized LiCoO 2 oxide as an anode material for LIBs. The electrode material as prepared was analyzed by XRD, FE-SEM and TEM. The electrochemical properties were investigated by cyclic voltammetry and by a constant current galvanostatic discharge–charge test. The material shows a high tap density and promising anode performance in terms of capacity, rate performance and cycling stability. A capacity of 560 mA h g −1 is still achieved at a current density of 1000 mA g −1 by increasing the amount of additives in the electrode to 40 wt%. This paper provides a new technique for developing a high-performance conversion-type anode for LIBs.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2017
·
IF 0
Zhen-Dong Huang,Ting-Ting Zhang,Hao Lu,Titus Masese,Kentarou Yamamoto,Rui-Qing Liu,Xiu-Jing Lin,Xiao-Miao Feng,Xian-Ming Liu,Dan Wang,Yoshiharu Uchimoto,Yan-Wen Ma
Titanium based compounds, such as TiO 2 , Li 5 Ti 4 O 12 and Na 2 Ti n O 2n+1 (where n = 3–8), have been pursued intensively for high energy and high power sodium and lithium ion batteries (NIBs and LIBs). Beside high rate and long life, the relatively higher capacity, higher tap density, scalable preparation process and low production cost are also essential factors for promising anode materials to progress from laboratory scale to pilot scale and finally to commercially scale up. Therefore, a dual-metal-organic crystal derived NiTiO 3 mesoporous micro-prism is developed by a scalable and unique self-assembly process. The interesting assembling mechanism is also clearly discussed based on the colour and microstructure evolutions of the reaction solution at different stage. The obtained NiTiO 3 hexagonal micro-prism features interconnected grain-boundary-rich and mesoporous structure, endowing highly conductive path for charge transportation and shortcut for ion diffusion. Together with a high tap density (2.5 g cm −3 ), this anode materials can deliver a high capacity of 373 and 562 mAh g −1 with superior rate and capacity retention for both sodium and lithium ion storage, respectively. It is also noteworthy that even after cycling for 1000 cycles at 5000 mA g −1 , the capacity retention ratio is maintained at 44.3% and 60.4% for sodium and lithium ion storage, respectively. The superior electrochemical properties , coupled with the low cost, dense structure and the scalable preparation method, will bring NiTiO 3 micro-prism to the fore as a promising contender anode material for long durability and high power compact NIBs and LIBs.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
无机非金属材料
·
电池技术
·
功能材料
✓ 已验证
DOI
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Wei Wang,Jia Liu,Yapeng Jia,Jun Yin,Lianzhou Zhang,Xuefei Zhou,Junpeng Li,Jianqiang Wang,Guoping Yang,Wenyan Zhang
Silver powder, as a pivotal material in electronics and new energy applications, critically depends on its tapped density and sintering activity. This study systematically optimizes the physical properties and sintering performance of micron silver powder through a synergistic surface modification strategy integrating jet milling classification and high-speed shear shaping. Results demonstrate that the modified silver powder exhibits a 40–45 % enhancement in tapped density (5.91 g/cm 3 ), a 50–56 % increase in apparent density (4.01 g/cm 3 ), a narrowed particle size distribution span (reduced from 2.93 to 0.52), and significantly improved flowability (angle of repose: 28.97°). The conductive silver paste formulated with modified powder achieves optimized rheological properties, including a 41.8 % higher 17-s recovery rate (84.5 %) and a 79.08 % reduction in static viscosity. Sintering experiments revealed that the modified silver powder achieved a maximum reduction in sintering temperature of 100 °C, with a relative density exceeding 97.3 % at 650 °C, with grain boundary diffusion and defect density modulation identified as the core mechanisms for densification. This work elucidates the synergistic regulatory mechanisms of surface modification on the sintering behavior of silver powders, aligning with the principles of tapped density enhancement and low-temperature sintering.
研究领域:
材料科学
·
电子材料
·
粉末冶金
·
表面工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）