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Restraining Capacity Increase To Achieve Ultrastable Lithium Storage: Case Study of a Manganese(II) Oxide/Graphene‐Based Nanohybrid and Its Full‐Cell Performance
Author(s) -
Liu DaiHuo,
Li Wei,
Wan Fang,
Fan ChaoYing,
Wang YingYing,
Zhang LinLin,
Lü HongYan,
Xing YueMing,
Zhang XiaoHua,
Wu XingLong
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600228
Subject(s) - anode , graphene , materials science , faraday efficiency , cathode , lithium (medication) , oxide , electrochemistry , battery (electricity) , electrode , energy storage , capacity loss , chemical engineering , manganese , nanotechnology , constant current , current density , voltage , chemistry , electrical engineering , metallurgy , medicine , power (physics) , physics , engineering , quantum mechanics , endocrinology
As is well known, a gradual increase in capacity during cycling is a common phenomenon in previously reported oxide‐based anodes for lithium‐ion batteries. However, not only may this be superfluous for practical applications, but it may also imply the presence of some electrochemical instabilities and side reactions. To achieve ultrastable Li storage without such a gradual increase in capacity, the mechanism of this increase by using a MnO/graphene‐based nanohybrid (MnO@C/RGO) as an example was comprehensively explored. Then, the gradual increase behavior of the specific capacity was effectively restrained by rationally optimizing the cutoff voltage, which resulted in the MnO@C/RGO electrode maintaining a nearly constant capacity during cycling at different current densities. Taking the high current density of 2 A g −1 as an example, there was no clear capacity change (increase/attenuation) even over 2000 cycles with stable coulombic efficiencies of around 99.7 %. This ultrastable Li‐storage capability should mainly benefit from rational testing parameters and an optimal 3D conductive network. More importantly and interestingly, full cells were also assembled and tested by coupling MnO@C/RGO and commercial LiFePO 4 as the anode and cathode materials, respectively. The full cells impressively exhibited superior rate performance and excellent cycling stability.