The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Jinhua Sun - One of the best experts on this subject based on the ideXlab platform.
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investigation of the thermal performance in lithium ion cells during Polyformaldehyde nail penetration
Journal of Thermal Analysis and Calorimetry, 2021Co-Authors: Jionggeng Wang, Wenxin Mei, Zhixian Cui, Dong Dong, Weixiong Shen, Jie Hong, Haodong Chen, Qiangling Duan, Qingsong Wang, Jinhua SunAbstract:The nail penetration test on lithium-ion cells with a tungsten steel nail can cause significant heat sinking to the nail. In this work, a Polyformaldehyde nail with both low thermal conductivity and low electrical conductivity is proposed to conduct the nail penetration test to study the thermal response. Meanwhile, a 3D electrochemical–thermal model is developed to predict the thermal behavior of lithium-ion cells during nail penetration tests. Two typical modes (recovery mode and non-recovery mode) of voltage response are observed and illustrated in Polyformaldehyde nail penetration tests. The present results demonstrate that Al–Cu short dominants the four internal short-circuit modes in Polyformaldehyde nail penetration tests. It can be concluded that net heat absorbed by the cell in Polyformaldehyde nail penetration modeling is more than that in tungsten steel nail penetration modeling, causing the higher temperature rise of lithium-ion cell in nail penetration tests with the tungsten steel nail than that of Polyformaldehyde nail. The present study provides an ideal alternative to solve the heat sinking to the nail in the nail penetration tests effectively.
Xing Yang - One of the best experts on this subject based on the ideXlab platform.
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development and application of rapid thermal cycling molding with electric heating for improving surface quality of microcellular injection molded parts
Applied Thermal Engineering, 2016Co-Authors: Chenglong Xiao, Hanxiong Huang, Xing YangAbstract:Abstract A rapid thermal cycling molding (RTCM) technology with electric heating and water cooling was developed to eliminate the surface defects of microcellular injection molded parts. To verify its effectiveness, an RTCM mold for producing microcellular cover plates was constructed. Experiments and simulations were conducted to evaluate the mold thermal response. The results show that the mold cavity surface temperature (TM) can be rapidly adjusted in a large range. Moreover, empirical correlations for predicting the TMs were proposed and validated, and then can be used as an effective tool to accurately control the TMs in actual molding. Finally, microcellular Polyformaldehyde (POM) cover plates were molded. The effect of the TM on their surface roughness was investigated and relevant mechanism was analyzed. It is found that the part surface roughness can be effectively reduced by increasing the TM. When raising the TM close to or above 150 °C, the microcellular POM cover plates with glossy appearance comparable to the solid counterpart can be molded within an accepted molding cycle time, demonstrating the effectiveness of the developed molding technology.
Yuezhong Meng - One of the best experts on this subject based on the ideXlab platform.
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highly safe lithium ion batteries high strength separator from Polyformaldehyde cellulose nanofibers blend
Journal of Power Sources, 2018Co-Authors: Junchen Liu, Kai Yang, Shuanjin Wang, Dongmei Han, Min Xiao, Yuezhong MengAbstract:Abstract As a pivotal part of lithium-ion batteries, separator is supposed to have high strength, thermal stability and excellent wettability. In this study, Polyformaldehyde/cellulose nanofibers blend separators are firstly prepared via thermally induced phase separation to improve the performance, especially the safety of LIBs. The Polyformaldehyde/cellulose blend separators show considerable tensile strength (116 MPa) and Young's modulus (6.07 GPa) owing to the high crystallinity and high performance of Polyformaldehyde and cellulose. In particular, benefiting from their abundant polar groups and highly porous structure, the Polyformaldehyde/cellulose blend separators possess high electrolyte uptake (412%) and small contact angle (19°) as compare to the commercial polyethylene separator (115%, 58°). Moreover, the thermal treatment tests indicate that the Polyformaldehyde/cellulose blend separators are thermally stable at as high temperature as 180 °C. And the Polyformaldehyde/cellulose blend separators show higher ionic conductivity (1.39 mS cm−1) and lower interface resistance (49.5 Ω) than polyethylene separator (0.76 mS cm−1, 136.4Ω). As expected, the LiFePO4/Li cell with Polyformaldehyde-20-cellulose blend separators exhibit the best stable cycling performance and improved rate performance than PE separator, especially at high rate. In summary, the Polyformaldehyde/cellulose blend separators are promising new kind of separator for LIBs with high safety and enhanced performance.
Jionggeng Wang - One of the best experts on this subject based on the ideXlab platform.
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investigation of the thermal performance in lithium ion cells during Polyformaldehyde nail penetration
Journal of Thermal Analysis and Calorimetry, 2021Co-Authors: Jionggeng Wang, Wenxin Mei, Zhixian Cui, Dong Dong, Weixiong Shen, Jie Hong, Haodong Chen, Qiangling Duan, Qingsong Wang, Jinhua SunAbstract:The nail penetration test on lithium-ion cells with a tungsten steel nail can cause significant heat sinking to the nail. In this work, a Polyformaldehyde nail with both low thermal conductivity and low electrical conductivity is proposed to conduct the nail penetration test to study the thermal response. Meanwhile, a 3D electrochemical–thermal model is developed to predict the thermal behavior of lithium-ion cells during nail penetration tests. Two typical modes (recovery mode and non-recovery mode) of voltage response are observed and illustrated in Polyformaldehyde nail penetration tests. The present results demonstrate that Al–Cu short dominants the four internal short-circuit modes in Polyformaldehyde nail penetration tests. It can be concluded that net heat absorbed by the cell in Polyformaldehyde nail penetration modeling is more than that in tungsten steel nail penetration modeling, causing the higher temperature rise of lithium-ion cell in nail penetration tests with the tungsten steel nail than that of Polyformaldehyde nail. The present study provides an ideal alternative to solve the heat sinking to the nail in the nail penetration tests effectively.
Chenglong Xiao - One of the best experts on this subject based on the ideXlab platform.
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development and application of rapid thermal cycling molding with electric heating for improving surface quality of microcellular injection molded parts
Applied Thermal Engineering, 2016Co-Authors: Chenglong Xiao, Hanxiong Huang, Xing YangAbstract:Abstract A rapid thermal cycling molding (RTCM) technology with electric heating and water cooling was developed to eliminate the surface defects of microcellular injection molded parts. To verify its effectiveness, an RTCM mold for producing microcellular cover plates was constructed. Experiments and simulations were conducted to evaluate the mold thermal response. The results show that the mold cavity surface temperature (TM) can be rapidly adjusted in a large range. Moreover, empirical correlations for predicting the TMs were proposed and validated, and then can be used as an effective tool to accurately control the TMs in actual molding. Finally, microcellular Polyformaldehyde (POM) cover plates were molded. The effect of the TM on their surface roughness was investigated and relevant mechanism was analyzed. It is found that the part surface roughness can be effectively reduced by increasing the TM. When raising the TM close to or above 150 °C, the microcellular POM cover plates with glossy appearance comparable to the solid counterpart can be molded within an accepted molding cycle time, demonstrating the effectiveness of the developed molding technology.