A CNC-Modified PAN Separator Improving the Cycle Stability of Lithium-Ion Batteries
Source abstract
Abstract
In this paper, a composite separator for lithium-ion batteries was successfully prepared by electrostatic spinning, based on polyacrylonitrile (PAN) and 5% cellulose nanocrystals (CNCs) derived from sisal fiber. Its physical and electrochemical properties as well as the enhanced mechanism were investigated. The obtained 5%CNCs/PAN separator offers an excellent thermal stability, ultra-high electrolyte uptake (486 ± 30%), high ionic conductivity (2.82 mS cm−1 at 25 °C) and a wide electrochemical window (5.3 V). In addition, a lithium-ion battery assembled with the 5%CNCs/PAN separator can work stably for 1000 h at 5 mA cm−2. The CNCs in the electrolyte enable the immobilization of PF6−, thereby inhibiting the migration of anions and increasing its Li+ transfer number (tLi+) to 0.75, which is 65.3% higher than that of a pure PAN separator. The battery with the 5%CNCs/PAN separator retains 97.4% of its initial reversible capacity after 100 cycles, which is much higher than that of a pure PAN separator, with a value of 62.9%. These results suggest the potential utility of 5%CNCs/PAN separators as high-performance separators required in lithium-ion batteries.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Technologies Research · Extraction and Separation Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin 541004, China
Key Laboratory of Function-Oriented Porous Materials, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China
Funding
Guangxi Key Technologies R&D Program · Guangxi Natural Science Foundation · Guilin Key Technologies R&D Program · National Natural Science Foundation of China · Innovation Project of Guangxi Graduate Education
References (52)
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