Carbon fiber composites with battery function: Stresses and dimensional changes due to Li-ion diffusion. (August 2018)

• Record Type: Journal Article
• Authors: Xu, Johanna; Lindbergh, Göran; Varna, Janis
• Is Part Of: Journal of composite materials. Volume 52:Number 20(2018)
• Page Start: 2729
• Page End: 2742
• Publication Date: 2018-08
• Subjects: Micro-battery -- carbon fibers -- lithium ion -- intercalation -- swelling -- stress state; Composite materials -- Periodicals; Composites -- Périodiques; 620.118
• DOI: 10.1177/0021998317752825
• Languages: English
• ISSNs: 0021-9983

Abstract

Structural composite materials that simultaneously carry mechanical loads, while storing electrical energy offers the potential of significantly reduced total component weight owing to the multifunctionality. In the suggested micro-battery, the carbon fiber is employed as a negative electrode of the battery and also as a composite reinforcement material. It is coated with a solid polymer electrolyte working as an ion conductor and separator while transferring mechanical loads. The coated fiber is surrounded by a conductive positive electrode material matrix. This paper demonstrates a computational methodology for addressing mechanical stresses arising in a conceptualized micro-battery and dimensional changes of the cell during electrochemical cycling, caused by time-dependent gradients in lithium ion concentration distribution.