Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700071
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Funding
- IT R&D program of MOTIE/KEIT (Development of Li-rich Cathode and Carbon-free Anode Materials for High Capacity/High Rate Lithium Secondary Batteries) [10046309]
- Ulsan National Institute of Science and Technology (UNIST) [1.170002.01]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10046306] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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While existing carbonaceous anodes for lithium-ion batteries (LIBs) are approaching a practical capacitive limit, Si has been extensively examined as a potential alternative because it shows exceptional gravimetric capacity (3579 mA h g(-1)) and abundance. However, the actual implementation of Si anodes is impeded by difficulties in electrode calendering processes and requirements for excessive binding and conductive agents, arising from the brittleness, large volume expansion (>300%), and low electrical conductivity (1.56 x 10(-3) S m(-1)) of Si. In one rational approach to using Si in high-energy LIBs, mixing Si-based materials with graphite has attracted attention as a feasible alternative for next-generation anodes. In this study, graphite-blended electrodes with Si nanolayer-embedded graphite/carbon (G/SGC) are demonstrated and detailed one-to-one comparisons of these electrodes with industrially developed benchmarking samples are performed under the industrial electrode density (> 1.6 g cc(-1)), areal capacity (> 3 mA h cm(-2)), and a small amount of binder (3 wt%) in a slurry. Because of the favorable compatibility between SGC and conventional graphite, and the well-established structural features of SGC, great potential is envisioned. Since this feasible study utilizes realistic test methods and criteria, the rigorous benchmarking comparison presents a comprehensive understanding for developing and characterizing Si-based anodes for practicable high-energy LIBs.
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