Abnormal electrochemical behavior of rounded graphite

Round-shaped natural graphite is commonly used as anode material for rechargeable lithium-ion batteries. We report atypical electrochemical behavior of round-shaped graphite anodes in Li-ion batteries: an intriguing phenomenon whereby substantial progressive increase in capacity is observed over ten...

Full description

Saved in:
Bibliographic Details
Published inCarbon (New York) Vol. 154; pp. 313 - 321
Main Authors Lavi, Ortal, Haik, Ortal, Hirshberg, Daniel, Talyosef, Yosef, Zinigard, Ella, Markovsky, Boris, Vestfrid, Yulia, Elias, Yuval, Aurbach, Doron, Kovacheva, Daniela
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.12.2019
Elsevier BV
Subjects
Anodes
Batteries
Electrochemical analysis
Electrode materials
Exfoliation
Fracture toughness
Graphene
Graphite
Lithium
Lithium-ion batteries
Raman spectroscopy
Rechargeable batteries
Spectrum analysis
Online AccessGet full text

Cover

More Information
Summary:Round-shaped natural graphite is commonly used as anode material for rechargeable lithium-ion batteries. We report atypical electrochemical behavior of round-shaped graphite anodes in Li-ion batteries: an intriguing phenomenon whereby substantial progressive increase in capacity is observed over tens of cycles. To understand the reasons underlying this abnormal behavior, we investigated the surface and bulk structure properties using HRSEM, XRD and Raman spectroscopy. Graphite particles with tense structure undergo exfoliation and fracture due to multiple transformations in intercalation/deintercalation processes. The increased capacity may result from enhanced particle exfoliation, compared with non-rounded graphite, which is accompanied by appearance of graphene sheets and fracture. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.07.080