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High performance flexible DIB with gel polymer electrolytes

2018-08-03 来源:转载自第三方
3 August 2018
  Recently, researchers at the Chinese Academy of Sciences have successfully developed a modified gel polymer electrolyte, which is applied to flexible dual-ion batteries, and the battery exhibits good cycle and rate performance. The study was published online in the international journal Advanced Energy Materials under the article entitled "A Flexible Dual-Ion Battery Based on PVDF-HFP-Modified Gel Polymer Electrolyte with Excellent Cycling Performance and Superior Rate Capability" [1].
Lithium-ion batteries dominate the electronics and electric vehicle markets due to their high energy density, long cycle life, low memory effects and low self-discharge. However, conventional liquid electrolytes have defects such as complex reactions at the solid/liquid interface, thermodynamic instability, volatile leakage, fire and even explosion, and growth of lithium dendrites. Therefore, solid electrolytes or polymer electrolytes have attracted more and more attention. Among them, polymer electrolyte batteries are more suitable for practical applications due to higher ionic conductivity.
Only Li+ is involved in the reaction between the positive and negative electrodes of the lithium ion battery. During the charging process of the dual ion battery (DIB), the anion migrates to the anode under the action of the electric field, and is embedded in the anode structure, and the cation migrates to the cathode, embedded in the cathode, the discharge process is reversed, the ions in the anode and cathode are removed, returning to the electrolyte, and the concentration of the electrolyte is restored. DIB has received increasing attention due to its high operating voltage, low cost, and environmental friendliness. However, the decomposition of conventional liquid carbonate electrolytes at high operating voltages makes the cycle stability of most DIBs still unsatisfactory.
This study reports for the first time the PVDF-HFP, polyethylene oxide (PEO) and graphene oxide (GO) co-doped gel electrolytes through weak bond interactions and high performance flexible DIB based on them. The polymer electrolyte exhibits a 3D porous network with a significant increase in ionic conductivity to 2.1 x 10-3 Scm-1, facilitating rapid ion transport of cationic Li+ and anionic PF6-. The novel DIB based on the gel electrolyte has excellent rate performance and cycle stability: at a high current rate of 5C (1C corresponds to 100mAg-1), the capacity retention rate after 2000 cycles is 92%; in addition, the battery is also good flexibility and thermal stability (still working at temperatures up to 90°C).
In this study, a gel polymer electrolyte with good electrochemical stability was prepared, which not only improved the cycle stability of the dual ion battery under high temperature and high pressure, but also provided the basis and strategy for the development of wearable electronic equipment.
[1] Guanghai Chen, Fan Zhang, Zhiming Zhou, et al. A Flexible Dual‐Ion Battery Based on PVDF‐HFP‐Modified Gel Polymer Electrolyte with Excellent Cycling Performance and Superior Rate Capability. Advanced Materials 2018, doi:10.1002/aenm.201801219.
Related links: LiPF6
Edited by Suzhou Yacoo Science Co., Ltd.