The thermal runaway issue has been a long-standing obstacle impeding the development of high energy density and high power delivery batteries. These batteries would generate a lot of heat in ultrafast charge/discharge process or hazardous conditions, such as overcharging and short-circuit. To dissipate the heat accumulated in the batteries, physical safety designs such as fused disconnect switches, extinguishing agents, and shutdown current collectors have been employed. However, these approaches only provide a one-time protection. There is no provision for these strategies to spontaneously restore the original working condition of batteries once the temperature is cooled down. Therefore, intelligent and active internal safety strategies need to be designed for fabricating smart batteries with dynamic electrochemical performance and self-adaptive response to temperature.
Reversible sol-gel transition hydrogels have received abundant research interests owing to their smart responsibility to ambient temperature. They are normally in flowing liquid state at or below room temperature and can transform into stationary gels when heating above critical temperature.
Schematic illustration of the thermoresponsive Zn/α-MnO2 batteries with reversible sol-gel transition electrolye.
Credit: ©Science China Press
Moreover, this transition can be reversed after cooling down, displaying interesting temperature-dependent properties. Sol-gel transition polymer may potentially be good candidates for designing advanced batteries with intelligent thermal responsibility.
Recently, a research team led by Prof. Chunyi Zhi from City University of Hong Kong has successfully synthesized a temperature-sensitive sol-gel transition electrolyte comprising proton-incorporated poly(N-isopropylacrylamide-co-acrylic acid) (PNA) and incorporated it into a rechargeable Zn/α-MnO2 battery system.
After heating above the low critical temperature, a gelation process occurs in the PNA sol-gel electrolyte and significantly inhibits the migration of zinc ions, leading to a decreased specific capacity and an increased internal resistance of the battery, thus shutting down the battery.
After cooling down, the transition is reversed to liquid state and an original electrochemical performance can be restored. More importantly, unlike traditional strategies, the sol-gel electrolyte endows the thermoresponsive battery with dynamic charge/discharge rate performance at different temperature, which enabled a "smart" thermal control for the battery. This work represents a feasible concept for self-protection batteries via reversible sol-gel transition.
This work was supported by NSFC/RGC Joint Research Scheme under Project N_CityU123/15 and NSFC 5151101197 and a Grant from City University of Hong Kong (PJ7004645). The work was also partially sponsored by Science & Technology Department of Sichuan Province (2017JY0088).
See the article:
Funian Mo, Hongfei Li, Zengxia Pei, Guojin Liang, Longtao Ma, Qi Yang, Donghong Wang, Yan Huang, Chunyi Zhi. A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes, Science Bulletin, 2018, doi: 10.1016/j.scib.2018.06.019
Chunyi Zhi | EurekAlert!
Energy-efficient spin current can be controlled by magnetic field and temperature
17.08.2018 | Johannes Gutenberg-Universität Mainz
Scientists create biodegradable, paper-based biobatteries
08.08.2018 | Binghamton University
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
17.08.2018 | Physics and Astronomy
17.08.2018 | Information Technology
17.08.2018 | Life Sciences