A High‐Energy Li‐Ion Battery Using a Silicon‐Based Anode and a Nano‐Structured Layered Composite Cathode |
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| Authors: | Changju Chae Hyung‐Joo Noh Jung Kyoo Lee Bruno Scrosati Yang‐Kook Sun |
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| Affiliation: | 1. Department of Chemical Engineering, Dong‐A University, Busan, Republic of Korea;2. Department of Energy Engineering, Hanyang University, Seoul, Republic of Korea;3. Italian Institute of Technology, Genova, Italy and King Abdulaziz University, Jeddah, Saudi Arabia;4. Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia |
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| Abstract: | High capacity electrodes based on a Si composite anode and a layered composite oxide cathode, Ni‐rich LiNi0.75Co0.1Mn0.15]O2, are evaluated and combined to fabricate a high energy lithium ion battery. The Si composite anode, Si/C‐IWGS (internally wired with graphene sheets), is prepared by a scalable sol–gel process. The Si/C‐IWGS anode delivers a high capacity of >800 mAh g?1 with an excellent cycling stability of up to 200 cycles, mainly due to the small amount of graphene (～6 wt%). The cathode (LiNi0.75Co0.1Mn0.15]O2) is structurally optimized (Ni‐rich core and a Ni‐depleted shell with a continuous concentration gradient between the core and shell, i.e., a full concentration gradient, FCG, cathode) so as to deliver a high capacity (>200 mAh g?1) with excellent stability at high voltage (～4.3 V). A novel lithium ion battery system based on the Si/C‐IWGS anode and FCG cathode successfully demonstrates a high energy density (240 Wh kg?1 at least) as well as an unprecedented excellent cycling stability of up to 750 cycles between 2.7 and 4.2 V at 1C. As a result, the novel battery system is an attractive candidate for energy storage applications demanding a high energy density and long cycle life. |
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| Keywords: | silicon anodes graphene cathodes lithium ion batteries energy storage |
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