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Performance Evaluation of Composite Electrolyte with GQD for All-Solid-State Lithium Batteries

Sung Won Hwang, Dae-Ki Hong*
Department of System Semiconductor Engineering, SangMyung University, Cheonan-si, 31066, Korea
* Corresponding Author: Dae-Ki Hong. Email:

Computers, Materials & Continua 2023, 74(1), 55-66. https://doi.org/10.32604/cmc.2023.028845

Received 19 February 2022; Accepted 06 May 2022; Issue published 22 September 2022

Abstract

The use a stabilized lithium structure as cathode material for batteries could be a fundamental alternative in the development of next-generation energy storage devices. However, the lithium structure severely limits battery life causes safety concerns due to the growth of lithium (Li) dendrites during rapid charge/discharge cycles. Solid electrolytes, which are used in high-density energy storage devices and avoid the instability of liquid electrolytes, can be a promising alternative for next-generation batteries. Nevertheless, poor lithium ion conductivity and structural defects at room temperature have been pointed out as limitations. In this study, through the application of a low-dimensional graphene quantum dot (GQD) layer structure, stable operation characteristics were demonstrated based on Li+ ion conductivity and excellent electrochemical performance. Moreover, the device based on the modified graphene quantum dots (GQDs) in solid state exhibited retention properties of 95.3% for 100 cycles at 0.5 C and room temperature (RT). Transmission electron microscopy analysis was performed to elucidate the Li+ ion action mechanism in the modified GQD/electrolyte heterostructure. The low-dimensional structure of the GQD-based solid electrolyte has provided an important strategy for stably-scalable solid-state lithium battery applications at room temperature. It was demonstrated that lithiated graphene quantum dots (Li-GQDs) inhibit the growth of Li dendrites by regulating the modified Li+ ion flux during charge/discharge cycling at current densities of 2.2–5.5 mA cm, acting as a modified Li diffusion heterointerface. A full Li GQD-based device was fabricated to demonstrate the practicality of the modified Li structure using the Li–GQD hetero-interface. This study indicates that the low-dimensional carbon structure in Li–GQDs can be an effective approach for stabilization of solid-state Li matrix architecture.

Keywords

Solid-state; lithium batteries; composite electrolyte; quantum dot; graphene

Cite This Article

S. W. Hwang and D. Hong, "Performance evaluation of composite electrolyte with gqd for all-solid-state lithium batteries," Computers, Materials & Continua, vol. 74, no.1, pp. 55–66, 2023.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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