BROWSE

Related Researcher

Author's Photo

Choi, Nam-Soon
Energy Materials Lab
Research Interests
  • Rechargeable lithium battery, electrolytes for next generation Mg and Na battery

ITEM VIEW & DOWNLOAD

Homogeneous Li deposition through the control of carbon dot-assisted Li-dendrite morphology for high-performance Li-metal batteries

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Homogeneous Li deposition through the control of carbon dot-assisted Li-dendrite morphology for high-performance Li-metal batteries
Author
Hong, DongkiChoi, YuriRyu, JaegeonMun, JinhongChoi, WooyeongPark, MinjuLee, YongwonChoi, Nam-SoonLee, GeunsikKim, Byeong-SuPark, Soojin
Issue Date
2019-09
Publisher
Royal Society of Chemistry
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.35, pp.20325 - 20334
Abstract
Lithium metal as a battery anode is one of the most promising energy storage materials owing to its high theoretical capacity and low working potential. However, uncontrollable Li growth during cycling raises safety issues in the battery due to dendrite formation and a poor coulombic reversibility. Here, a design involving carbon nanodots (CDs) as electrolyte additives is introduced, which could significantly improve the morphology of the Li plating and cycling stability of lithium-metal batteries (LMBs). These CDs are suitable electrolyte additives because they show good dispersibility against organic solvents, originating from their 2–5 nm small-sized particles. In addition, CDs include surface negative charges and various functional groups, which are easily controllable through modulating the amount and types of precursors used. The surface negative charges and the functional groups in the CDs draw Li cations by electrostatic force and provide a strong Li-ion affinity. This synergistic combination enables uniform Li-ion transportation to the current collector, resulting in metal reduction with a smooth surface during the plating/stripping process. Moreover, the control of the CD-assisted Li dendrite morphology was examined by ex situ transmission electron microscopy. In the LMB full-cell tests with limited 20 μm-thick Li metal, the CD-containing electrolytes exhibited a capacity retention value of 99.9% after 100 cycles. Here, the CD-assisted Li deposition minimized the risks originating from Li dendrite growth, thus stabilizing the cycling ability of the LMB.
URI
https://scholarworks.unist.ac.kr/handle/201301/27820
URL
https://pubs.rsc.org/en/content/articlelanding/2019/ta/c9ta06260b#!divAbstract
DOI
10.1039/C9TA06260B
ISSN
2050-7488
Appears in Collections:
SNS_Journal Papers
ECHE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU