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Flexible 3D Interlocking Lithium-Ion Batteries
Cha, Hyungyeon,Lee, Yoonji,Kim, Junhyeok,Park, Minjoon,Cho, Jaephil Wiley-VCH 2018 ADVANCED ENERGY MATERIALS Vol.8 No.30
<P> Highly deformable and advanced flexible lithium-ion batteries (LIBs) are considered to be a promising power source for flexible electronics. However, despite tremendous efforts to achieve flexibility, battery performance still lags behind the commercial standards. Here, a flexible 3D interlocking LIB via a one-step patterning process of a preassembled cell under industrial electrode fabrication conditions, to satisfy commercial viability, is demonstrated. The 3D interlocking full-cell with a high electrode loading level demonstrates excellent cycle performance without any degradation during the 5000 times flexing process. The tightly connected cathode and anode increase the contact area and prevent the current issues of flexible batteries such as delamination, electrode cracking, and lithium plating. This study on flexible batteries therefore suggests the 3D interlocked architecture lends itself to the design of highly deformable energy storage devices. </P>
Kim, Junhyeok,Ma, Hyunsoo,Cha, Hyungyeon,Lee, Hyomyung,Sung, Jaekyung,Seo, Minho,Oh, Pilgun,Park, Minjoon,Cho, Jaephil The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.6
<P>Advanced surface engineering of nickel-rich cathode materials greatly enhances their structural/thermal stability. However, their application into lithium-ion full-cells still faces challenges, such as the unstable solid electrolyte interphase (SEI) layer on the anode. Herein, we reveal that the degradation of battery cycle life is caused by the release of divalent nickel ions from the LiNi0.8Co0.1Mn0.1O2 cathode and the formation of nickel metal particles on the graphite anode surface, deteriorating the anode SEI layer and its structural integrity. On the basis of this finding, we demonstrate a stable lithium-ion battery by modifying the cathode surface by creating a nanostructured stabilizer with an epitaxial structure that enhances the morphological robustness. During cycling, the nickel defects in the cathode are significantly suppressed, preventing nickel ion crossover. In particular, the anode SEI layer maintains a uniform and dense structure, leading to outstanding cycling stability in the full-cell with a capacity retention of ∼86% after 400 cycles at 25 °C.</P>