Exploiting lithium-ether co-intercalation in graphite for high-power lithium-ion batteries

Title
Exploiting lithium-ether co-intercalation in graphite for high-power lithium-ion batteries
Authors
임희대김해겸임경미윤갑인박재혁구교진성영은강기석
Issue Date
2017-06
Publisher
Advanced Energy Materials
Citation
VOL 7, NO 19-1700418-10
Abstract
The intercalation of lithium ions into graphite electrode is the key underlying mechanism of modern lithium‐ ion batteries. However, co‐ intercalation of lithium‐ ions and solvent into graphite is considered undesirable because it can trigger the exfoliation of graphene layers and destroy the graphite crystal, resulting in poor cycle life. Here, it is demonstrated that the [lithium– solvent]+ intercalation does not necessarily cause exfoliation of the graphite electrode and can be remarkably reversible with appropriate solvent selection. First‐ principles calculations suggest that the chemical compatibility of the graphite host and [lithium– solvent]+ complex ion strongly affects the reversibility of the co‐ intercalation, and comparative experiments confirm this phenomenon. Moreover, it is revealed that [lithium– ether]+ co‐ intercalation of natural graphite electrode enables much higher power capability than normal lithium intercalation, without the risk of lithium metal plating, with retention of ≈ 87% of the theoretical capacity at current density of 1 A g− 1. This unusual high rate capability of the co‐ intercalation is attributed to the (i) absence of the desolvation step, (ii) negligible formation of the solid– electrolyte interphase on graphite surface, and (iii) fast charge‐ transfer kinetics. This work constitutes the first step toward the utilization of fast and reversible [lithium– solvent]+ complex ion intercalation chemistry in graphite for rechargeable battery technology.
URI
http://pubs.kist.re.kr/handle/201004/67599
ISSN
1614-6832
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

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

BROWSE