Abnormal electrochemical behavior of rounded graphite

Ortal Lavi; Ortal Haik; Daniel Hirshberg; Yosef Talyosef; Ella Zinigard; Boris Markovsky; Yulia Vestfrid; Yuval Elias; Doron Aurbach; Daniela Kovacheva

doi:10.1016/j.carbon.2019.07.080

Abnormal electrochemical behavior of rounded graphite

Ortal Lavi, Ortal Haik, Daniel Hirshberg, Yosef Talyosef, Ella Zinigard, Boris Markovsky, Yulia Vestfrid, Yuval Elias, Doron Aurbach, Daniela Kovacheva

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1 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	313-321
Number of pages	9
Journal	Carbon
Volume	154
DOIs	https://doi.org/10.1016/j.carbon.2019.07.080
State	Published - Dec 2019

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Publisher Copyright:
© 2019

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title = "Abnormal electrochemical behavior of rounded graphite",

abstract = "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.",

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AU - Lavi, Ortal

AU - Haik, Ortal

AU - Hirshberg, Daniel

AU - Talyosef, Yosef

AU - Zinigard, Ella

AU - Markovsky, Boris

AU - Vestfrid, Yulia

AU - Elias, Yuval

AU - Aurbach, Doron

AU - Kovacheva, Daniela

PY - 2019/12

Y1 - 2019/12

N2 - 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.

AB - 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.

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Abnormal electrochemical behavior of rounded graphite

Abstract

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