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3D Current Collectors for Lithium‐Ion Batteries: A Topical Review
Author(s) -
Yue Yuan,
Liang Hong
Publication year - 2018
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201800056
Subject(s) - slurry , current (fluid) , battery (electricity) , lithium (medication) , electrochemistry , current collector , current density , materials science , energy storage , casting , ion , capacitor , environmental science , voltage , engineering physics , process engineering , composite material , electrical engineering , electrode , chemistry , engineering , thermodynamics , physics , power (physics) , medicine , organic chemistry , endocrinology , quantum mechanics
Current collectors play important roles in enhancing the electrochemical performance of lithium‐ion batteries. Currently used collectors are mostly made of aluminum or copper foils through slurry casting with binders that have not reached optimal capacity. Furthermore, extended cycles of charge and discharge induce detachment of the cast layer, resulting in damage to the structural integrity. In order to better understand the principles of the performance of and thus optimize current collectors, a critical review is conducted focusing on their structures. Through analysis of data collected from more than 50 publications, the capacity and retention as a function of current density and charge cycle, respectively, are identified. Two new terms, which are characteristic of 3D current collectors, are defined as Regime I and Regime II in the corresponding plots. Regime I refers to the maximum reversible capacity and Regime II to the maximum capacitor retention. The greater the values of those values, the greater the enhancement of capacity and retention. Using these concepts, it is predicted that carbonaceous and fibrous 3D hierarchical current collectors would be beneficial as battery collectors. The results and approach provide perspective for future design and advancement of electrochemical energy‐storage devices.