Prominent enhancement of stability under high current density of LiFePO4-based multidimensional nanocarbon composite as cathode for lithium-ion batteries
- Authors
- Kim, Jihyun; Song, Seunghyun; Lee, Churl Seung; Lee, Minbaek; Bae, Joonho
- Issue Date
- Nov-2023
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- Lithium iron phosphate; Graphene quantum dots; Multidimensional nanocarbon composite; Cathode; Lithium -ion batteries
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.650, pp 1958 - 1965
- Pages
- 8
- Journal Title
- JOURNAL OF COLLOID AND INTERFACE SCIENCE
- Volume
- 650
- Start Page
- 1958
- End Page
- 1965
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/90355
- DOI
- 10.1016/j.jcis.2023.07.030
- ISSN
- 0021-9797
1095-7103
- Abstract
- A facile method for synthesizing carbon-coated lithium iron phosphate (LiFePO4, LFP) and an LFP-based multidimensional nanocarbon composite to enhance the electrochemical performance of lithium-ion batteries is presented herein. Three types of cathode materials are prepared: carbon-coated LFP (LC), carbon-coated LFP with carbon nanotubes (LC@C), and carbon-coated LFP with carbon nanotubes/graphene quantum dots (LC@CG). The electrochemical performances of the LC-nanocarbon composites are compared, and both LC@C and LC@CG show improved electrochemical performance than LC. Compared with both the LC and LC@C electrodes, the LC@CG electrode exhibits the highest specific capacity of 107.1 mA h g-1 under 20C of current density, as well as higher capacities and greater stability over all measured current densities. Moreover, after 300 charge-discharge cycles, the LC@CG electrode exhibits the best stability than the LC and LC@C electrodes. This is attributable to the graphene quantum dots, which enhance the morphological stability of the LC@CG electrode during electrochemical measurements. Our findings suggest that LFP-nanocarbon composites are promising as cathode materials and highlight the potential of graphene quantum dots for improving the stability of cathodes.
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