Calcium silicate composited nano-Si anode with low expansion and high performance for lithium-ion batteries
| Autor: | Yixuan Guo, Tong Zhou, Jiayu Peng, Henghui Xu, Lihong Xue, Wuxing Zhang |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Energy Materials and Devices, Vol 1, Iss 2, p 9370019 (2023) |
| Druh dokumentu: | article |
| ISSN: | 3005-3315 3005-3064 |
| DOI: | 10.26599/EMD.2023.9370019 |
| Popis: | SiO is a promising anode material for next-generation lithium-ion batteries (LIBs) with high-energy density. However, the passivation of silicon oxide in SiO remains challenging to reduce its irreversible reactions and volume expansion during cycling. In this work, a scalable approach is proposed to synthesize calcium silicate/nanosilicon composites (pSi@CaO) by transforming the SiO2 in disproportionate SiO into calcium silicate at 1000 ℃. The bulk-distributed calcium silicate in pSi@CaO can effectively inhibit nanosilicon expansion and enhance ionic transfer. The optimized pSi@20%CaO anode demonstrates a low electrode expansion of 12.3% upon lithiation and 7.6% upon lithiation after 50 cycles. It also exhibits excellent electrochemical stability, delivering a specific capacity of 808 mAh g−1 at 50 mA g−1 with an initial Columbic efficiency of 72% and maintaining 82% capacity after 500 cycles at 1 A g−1. The feasible CaO passivation strategy proposed in this work is expected to promote practical applications of Si-based anodes in high-performance LIBs. |
| Databáze: | Directory of Open Access Journals |
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