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3D‐Printed Cathodes of LiMn 1− x Fe x PO 4 Nanocrystals Achieve Both Ultrahigh Rate and High Capacity for Advanced Lithium‐Ion Battery
Author(s) -
Hu Jiangtao,
Jiang Yi,
Cui Suihan,
Duan Yandong,
Liu Tongchao,
Guo Hua,
Lin Lingpiao,
Lin Yuan,
Zheng Jiaxin,
Amine Khalil,
Pan Feng
Publication year - 2016
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201600856
Subject(s) - materials science , nanocrystal , cathode , diffusion , electrode , electrochemistry , electrolyte , porosity , lithium (medication) , ion , chemical engineering , nanotechnology , analytical chemistry (journal) , composite material , chemistry , thermodynamics , medicine , physics , quantum mechanics , chromatography , endocrinology , engineering
A 3D‐printing technology and printed 3D lithium‐ion batteries (3D‐printed LIBs) based on LiMn 0.21 Fe 0.79 PO 4 @C (LMFP) nanocrystal cathodes are developed to achieve both ultrahigh rate and high capacity. Coin cells with 3D‐printed cathodes show impressive electrochemical performance: a capacity of 108.45 mAh g −1 at 100 C and a reversible capacity of 150.21 mAh g −1 at 10 C after 1000 cycles. In combination with simulation using a pseudo 2D hidden Markov model and experimental data of 3D‐printed and traditional electrodes, for the first time deep insight into how to achieve the ultrahigh rate performance for a cathode with LMFP nanocrystals is obtained. It is estimated that the Li‐ion diffusion in LMFP nanocrystal is not the rate‐limitation step for the rate to 100 C, however, that the electrolyte diffusion factors, such as solution intrinsic diffusion coefficient, efficiency porosity, and electrode thickness, will dominate ultrahigh rate performance of the cathode. Furthermore, the calculations indicate that the above factors play important roles in the equivalent diffusion coefficient with the electrode beyond a certain thickness, which determines the whole kinetic process in LIBs. This fundamental study should provide helpful guidance for future design of LIBs with superior electrochemical performance.