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High‐Performance, Low‐Cost, and Dense‐Structure Electrodes with High Mass Loading for Lithium‐Ion Batteries
Author(s) -
Wu Xinsheng,
Xia Shuixin,
Huang Yuanqi,
Hu Xiangchen,
Yuan Biao,
Chen Shaojie,
Yu Yi,
Liu Wei
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201903961
Subject(s) - materials science , electrode , anode , cathode , lithium (medication) , porosity , ion , sintering , chemical engineering , diffusion , lithium ion battery , battery (electricity) , optoelectronics , composite material , nanotechnology , electrical engineering , medicine , power (physics) , chemistry , physics , quantum mechanics , engineering , endocrinology , thermodynamics
Lithium‐ion batteries have undergone a remarkable development in the past 30 years. However, conventional electrodes are insufficient for the ever‐increasing demand of high‐energy batteries. Here, reported is a thick electrode with a dense structure, as an alternative to the commonly recognized porous framework. A low‐temperature sintering technology with the aid of aqueous solvent, high pressure, and an ion‐conductive additive is originally developed for preparing the LiCoO 2 (LCO)/Li 4 Ti 5 O 12 (LTO) dense‐structure electrode as the representative cathode/anode material. The 400 µm thick cathode with 110 mg cm −2 mass loading achieves a high specific capacity of 131.2 mAh g −1 with a good capacity retention of 96% over 150 cycles, far exceeding the commercial counterpart (≈40 µm) of 54.1 mAh g −1 with 39%. The ultrathick electrode of 1300 µm thickness presents a remarkable area capacity of 28.6 mAh cm −2 that is 16 times that of the commercial electrode. The full cell based on the dense electrodes delivers an extremely high areal capacity of 14.4 mAh cm −2 . The ion‐diffusion coefficients of the densely sintered electrodes increase by nearly three orders of magnitude. This design opens up a new avenue for scalable and sustainable material manufacturing towards various practical applications.