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2019, Volume 13, Issue 4

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Frontiers in Energy >> 2019, Volume 13, Issue 4 doi: 10.1007/s11708-019-0650-y

Promoting Si-graphite composite anodes with SWCNT additives for half and NCM811 full lithium ion batteries and assessment criteria from an industrial perspective

. Department of Mechanical and Aerospace Engineering, Princeton University; HiT Nano, Inc, Princeton NJ 08540, USA.. HiT Nano, Inc, Princeton 08540, USA.. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton NJ 08544, USA.. Department of Mechatronics Engineering, College of Mechanical Engineering, Guangxi University, Nanning 530004, China.. Department of Physics, Princeton University, Princeton NJ 08544, USA

Accepted: 2019-12-05 Available online: 2019-12-05
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Abstract

Single wall carbon nanotube (SWCNT) additives were formulated into µm-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes. The critical role of small amount of SWCNT addition (0.2 wt%) was found for significantly improving delithiation capacity, first cycle coulombic efficiency (FCE), and capacity retention. Particularly, Si (10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92% FCE at 0.2 C during the first charge-discharge cycle, and 91% capacity retention after 50 cycles (0.5 C) in a half cell. Scanning electron microscope (SEM) was used to illustrate the electrode morphology, compositions and promoting function of the SWCNT additives. In addition, full cells assembled with high nickel-NCM811 cathodes and µm-Si-graphite composite anodes were evaluated for the consistence between half and full cell performance, and the consideration for potential commercial application. Finally, criteria to assess Si-containing anodes are proposed and discussed from an industrial perspective.

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