Insights into self-induced electrochemical activation of carbon cathode

Lyu，Linlong1; Hu，Jing3; Cheng，Kui4; Lin，Dongmei1; Li，Kaikai5; Lu，Zhouguang3; Yao，Haimin1; Zhou，Limin2

2022-03-01

10.1016/j.carbon.2021.11.064

CARBON   影响因子和分区

0008-6223

1873-3891

Continuous capacity increase in electrochemical cycling, termed as electrochemical activation, is a frequently observed but rarely systematically studied phenomenon. Such phenomenon is noted in a preliminary study of carbon cathode for dual ion battery, showing gradual discharge capacity growth from 186 mAh g (the 1st) to 320 mAh g (the 300th). Systematical characterizations are carried out to investigate this phenomenon occurred on the carbon cathode, hydrothermally reduced graphene oxide (HrGO). The electrochemical activation comes from surface area increment, originated from multilayer reduced graphene oxide rolls formation and accumulation and structural order increase in cycling. The formation of rolls is plausibly a result of strain release of reduced graphene layers after electrochemical interaction with PF. Additionally, charge storage mechanism of HrGO is revealed. At active surface sites of HrGO, PF is consistently stored in a pseudocapacitive manner. In contrast, at well-crystallized domains, pseudocapacitive PF uptake occurs at low voltage region while PF intercalation dominates at higher potentials. Supportive lithium storage also contributes to total capacity. Comprehensively, this work offers valuable insights of electrochemical activation and carbon cathodes’ electrochemical behaviors and will facilitate the construction of high-capacity carbon cathodes.

Carbon cathode Electrochemical activation In situ Raman Multi-ion storage Reduced graphene oxide rolls

SCI ; EI

英语

通讯

Chemistry ; Materials Science

Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000728540900009

PERGAMON-ELSEVIER SCIENCE LTD

20214911275543

Cathodes ; Chemical activation ; Electric discharges

Electricity: Basic Concepts and Phenomena:701.1 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Chemical Products Generally:804

CHEMISTRY

2-s2.0-85120421942

Scopus

1.Department of Mechanical Engineering,The Hong Kong Polytechnic University,Kowloon,Hung Hom, Hong Kong,Hong Kong
2.School of System Design and Intelligent Manufacturing,Southern University of Science and Technology,Shenzhen,518055,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.College of Engineering,Northeast Agricultural University,Harbin,150030,China
5.School of Materials Science and Engineering,Harbin Institute of Technology,Shenzhen,518055,China

Lyu，Linlong,Hu，Jing,Cheng，Kui,et al. Insights into self-induced electrochemical activation of carbon cathode[J]. CARBON,2022,188:177-186.

Lyu，Linlong.,Hu，Jing.,Cheng，Kui.,Lin，Dongmei.,Li，Kaikai.,...&Zhou，Limin.(2022).Insights into self-induced electrochemical activation of carbon cathode.CARBON,188,177-186.

Lyu，Linlong,et al."Insights into self-induced electrochemical activation of carbon cathode".CARBON 188(2022):177-186.