4.4 Article

Carbon fiber composites with battery function: Stresses and dimensional changes due to Li-ion diffusion

期刊

JOURNAL OF COMPOSITE MATERIALS
卷 52, 期 20, 页码 2729-2742

出版社

SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998317752825

关键词

Micro-battery; carbon fibers; lithium ion; intercalation; swelling; stress state

资金

  1. Swedish Energy Agency [37712-1]

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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.

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