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Current efforts and status of recycling technology development of electric vehicle battery in China
( Xiao Lin ),( Gangfeng Liu ),( Xue Wang ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
With the proposed goal of Carbon Neutrality, electric vehicles and other new energy industries are developing rapidly, the demand for lithium-ion batteries is increasing, which will certainly lead to a wave of scrapping in the future. On the one hand, the spent lithium-ion battery is flammable and explosive, and the organic toxic components contained requires harmless treatment; On the other hand, spent lithium-ion batteries have the property of resources e.g., Nickel, Cobalt, Manganese, Lithium and other valuable components. Therefore, the recycling of spent lithium-ion batteries can not only protect the environment, but also alleviate the global strategic metal resource tension and promote the healthy and sustainable development of new energy industry, which has become a hot topic in the global research. This article provides an overview of the lithium-ion battery recycling market, especially in China. Then we will share our research on the whole process recovery of lithium batteries, including the pre-treatment of spent Lithium-ion to obtain black powder that meets the requirements of the subsequent process, then the traditional hydrometallurgical recycling process for valuable metals in the black powder and ultra-short process developed by Botree Cycling will be introduced and compared. At last, the latest study on the life-cycle carbon footprint assessment for Lithium-ion batteries including the end-of-life stage will be mentioned.
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Xiaolin Shi,Xitian Tian,Gangfeng Wang 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.7
Considering that each computer-aided design (CAD) system has independent geometric dimensioning and tolerancing modeling method, precision information model generated by different CAD systems is difficult to be shared and reused by the downstream precision analysis system. To tackle the problem that tolerance semantic information cannot be transmitted through data exchange standards, this paper aims to propose a novel semantic tolerance screening approach to represent precision information for assembly precision analysis (APA) in the design stage. Based on semantic correlation between tolerance propagation and accumulation, precision information of multi-parts is preliminarily screened out. Then by utilizing semantic web rule language rules to determine the type and position of tolerance zones, multiple tolerances existing on a precision feature surface are refinedly screened out. Finally, a formal tolerance screening ontology, named ToS-Ontology, is generated for performing APA of complex products. The effectiveness of the proposed approach is demonstrated by a practical example, which is to calculate center distance between two holes to ensure bolts can pass smoothly in the limit case.
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Surface effect on the necking of hyperelastic materials
Li Min,Yan Yi,Xu Shihao,Wang Gangfeng,Wu Jian,Feng Xi-Qiao 한국물리학회 2022 Current Applied Physics Vol.38 No.-
Necking is a widely observed instability phenomenon. Surface tension often plays a significant role in the deformation of soft materials, especially at the micro scale, but its influence on the necking behavior of soft structures remains unclear. In this paper, we use the energy method to explore surface effects on the necking of soft plates and cylindrical bars under uniaxial tension. Analytical solutions are derived for the critical conditions of necking instability in the two types of structural components with a power-law constitutive relation. It is found that surface energy shows different impacts on their necking behaviors – it tends to postpone the occurrence of necking in soft plates but promote that in soft cylinders. This work not only deepens our understanding of the instability of soft materials but also helps design soft devices and robots.
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Yi Xu,Yuqin Ma,Yu Yang,Gangfeng Wang,Wei Xu,Fei Li,Haiyin Guo,Yatao Li 한국섬유공학회 2023 Fibers and polymers Vol.24 No.8
A study on the shape memory properties of 6 layers bi-directional basalt fiber/carbon fiber hybrid composites with graphene oxide (GO) was presented in this paper. The hybrid composites were prepared by the vacuum infiltration hot pressing system (VIHPS). The macroscopic appearance of these composites was desirable, and their microstructure was satisfactory. According to the test results, with the content of basalt fiber decreased, the shape fixation ratio decreased, while the shape recovery ratio and shape recovery force all increased. The basalt fiber composite with 6 layers basalt fiber (B6) had a maximum shape fixation ratio of 94.94%, a minimum shape recovery ratio of 85.52%, and a minimum recovery force of 1.36 N. Compared with B6, the shape fixation ratio of the carbon fiber composite with 6 layers carbon fiber (C6) decreased by 10.43%, which was 84.51%. The shape recovery ratio and shape recovery force were increased by 9.60% and 3.31 times, and their values were 95.12% and 5.86 N, respectively. In addition, according to the temperature-recovery force curves, it was found that the seven groups of composites all reached their maximum shape recovery force when the temperature was about 110 °C. When the temperature was between 50 °C and 80 °C, the recovery force of the composite increased greatly, and then, the recovery force increased slightly. However, when the temperature was above the glass transition temperature (Tg), the recovery force gradually decreased.
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