Nowadays, lithium-ion batteries are required to have a higher energy density and safety because of their wide applications. Current commercial separators have poor wettability and thermal stability, which significantly impact the performance and safety of batteries. In this study, a class of boehmite particles with different grain sizes was synthesized by adjusting hydrothermal temperatures and used to fabricate boehmite/polyacrylonitrile (BM/PAN) membranes. All of these BM/PAN membranes can not only maintain excellent thermal dimensional stability above 200 °C but also have good electrolyte wettability and high porosity. More interestingly, the BM/PAN membranes' thermal shutdown temperature can be adjusted by changing the grain size of boehmite particles. The lithium-ion batteries assembled with BM/PAN separators exhibit different thermal stability phenomena at 150 °C and have excellent rate performance and cycle stability at room temperature. After 120 cycles at 1C, the LiFePO 4 half-cell assembled by the best BM/PAN separator has almost unchanged discharge capacity, whereas the capacity retention of Celgard 2325 is only about 85%. Meanwhile, the NCM523 half-cell assembled with the best BM/PAN separator shows superb cycle stability after 500 cycles at 8C, with a capacity retention of 79% compared with 56% for Celgard 2325.

Based on the contact characteristics of helical surfaces and the coexistence of rolling and sliding at the screw-roller interface, a forecast model of the thread pair using Archard wear theory is proposed. To obtain the wear depth and the wear volume of the screw raceway in the whole effective stroke, a test rig of the thread wear is developed to obtain the wear rate that can be used to fit the values of the stress index and speed index. The area coefficient is further deduced to reflect the real wear condition. The calculation method of the relative sliding speed, coordinate transformation and load distribution are provided, the finite element (FE) model is established, and the transient dynamic simulation of the thread wear is implemented to verify the correctness of the wear model. The relative error is less than 9% between the FE model and proposed model by comparing the wear depths and wear volumes, which indicates the wear model proposed in this paper is valid and can be used to forecast the thread wear of the PRSM. Finally, the wear behavior of the thread pair is preliminarily discussed based on the FE model.

In recent years, the synthesis of inorganic materials with different particle sizes and the structure-activity relationship of inorganic materials have been hot research topics in the materials and chemistry field....

Commercial lithium‐ion battery separators suffer from low porosity, inferior wettability, and poor thermal stability. It is essential to develop separators with better thermal stability and electrolyte uptake to improve the performance and safety of lithium‐ion batteries. Herein, the belt‐like boehmite (AA‐BM) is synthesized and used in the separators as inorganic reinforcing material. Electrospinning technology is utilized to prepare multifunctional AA‐BM/polyacrylonitrile (PAN) separators. As a result, the AA‐BM/PAN separators demonstrate high porosity, low contact angle, excessive electrolyte uptake, and excellent thermal shrinkage. The AA‐BM/PAN separators are assembled into half‐cells (LiFePO4//separator//Li). AA‐BM/PAN separators show superb thermal stability at high temperatures and excellent reversible thermal shutdown performance. In addition, Li//Li batteries show that the PAN separators of boehmite compound can effectively inhibit the growth of lithium dendrite and improve the safety of batteries.

Based on the contact characteristics of helical surfaces and the coexistence of rolling and sliding at the screw-roller interface, a forecast model of thread pair using Archard wear theory is proposed. To obtain the wear depth and the wear volume of the screw raceway in the whole effective stroke, a test rig of thread wear is developed to obtain the wear rate that can be used to fit the values of the stress index and speed index. The area coefficient is further deduced to reflect the real wear condition. The calculation method of the relative sliding speed, coordinate transformation and load distribution are provided, the finite element (FE) model is established, and the transient dynamic simulation of thread wear is implemented to verify the correctness of the wear model. The relative error is less than 9% between the FE model and proposed model by comparing the wear depths and wear volumes, which indicates the wear model proposed in this paper is valid and can be used to forecast the thread wear of the PRSM. Finally, the wear behavior of the thread pair is preliminarily discussed based on the FE model.