Facile Preparation of a Trilayer Separator with a Shutdown Function Based on the Compounding of β-Crystal Polypropylene and Hydrogenated Petroleum Resin,Industrial & Engineering Chemistry Research

当前位置： X-MOL 学术 › Ind. Eng. Chem. Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Facile Preparation of a Trilayer Separator with a Shutdown Function Based on the Compounding of β-Crystal Polypropylene and Hydrogenated Petroleum Resin
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.iecr.2c01097
Shou-Zhan Li ₁ , Lei Ding ₂ , Feng Yang ₁ , Tong Wu ₁ , Fang Lan ₁ , Ya Cao ₁ , Ming Xiang ₁

Affiliation

A shutdown-functionalized lithium-ion battery membrane plays an important part in preventing thermal runaway as batteries suffer an external short circuit, accidental overcharging, and abuse of battery pack. In this study, an isotactic polypropylene (iPP)/hydrogenated petroleum resin (HPR) + iPP/iPP trilayer separator with shutdown property is prepared through a facile dry process with biaxial stretching. The shutdown function is obtained by the low softening temperature of HPR, which closes the microporous structure at a relatively low temperature. This trilayer separator has a similar porosity, Gurley value, and electrolyte uptake compared with the pure iPP separator at room temperature. When the temperature exceeds the softening point, HPR within the core layer melts to close the channels for Li-ion transport, causing micropores to collapse; meanwhile, the iPP skin layers hold the dimensional stability of the whole separator to prevent the internal short circuiting. In addition, electrochemical tests reveal that the interface impedance, ionic conductivity, and cycle performance of the iPP/HPR + iPP/iPP trilayer separator are similar to those of the pure iPP separator and commercial separator. The proposed method features simple techniques, environmental friendliness, and low manufacturing cost, which can offer new thoughts for the mass fabrication of high-function separators.

中文翻译：

基于β-结晶聚丙烯和氢化石油树脂复合的具有关闭功能的三层隔膜的简易制备

由于电池遭受外部短路、意外过度充电和电池组滥用，停机功能化锂离子电池隔膜在防止热失控方面发挥着重要作用。在这项研究中，通过双轴拉伸的简便干法工艺制备了具有关闭性能的全同立构聚丙烯（iPP）/氢化石油树脂（HPR）+ iPP/iPP三层隔膜。关闭功能是通过HPR的低软化温度获得的，它在相对较低的温度下关闭微孔结构。与室温下的纯 iPP 隔膜相比，这种三层隔膜具有相似的孔隙率、Gurley 值和电解质吸收率。当温度超过软化点时，芯层内的HPR熔化，关闭锂离子传输的通道，导致微孔塌陷；同时，iPP表层保持整个隔膜的尺寸稳定性，防止内部短路。此外，电化学测试表明，iPP/HPR + iPP/iPP三层隔膜的界面阻抗、离子电导率和循环性能与纯iPP隔膜和商用隔膜相似。该方法工艺简单、环境友好、制造成本低，可为大规模制备高功能隔膜提供新思路。iPP/HPR + iPP/iPP三层隔膜的循环性能与纯iPP隔膜和商业隔膜相似。该方法工艺简单、环境友好、制造成本低，可为大规模制备高功能隔膜提供新思路。iPP/HPR + iPP/iPP三层隔膜的循环性能与纯iPP隔膜和商业隔膜相似。该方法工艺简单、环境友好、制造成本低，可为大规模制备高功能隔膜提供新思路。

更新日期：2022-06-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11