@article{Guo2023, 
author = {Yixuan Guo and Tong Zhou and Jiayu Peng and Henghui Xu and Lihong Xue and Wuxing Zhang},
title = {Calcium silicate composited nano-Si anode with low expansion and high performance for lithium-ion batteries},
year = {2023},
journal = {Energy Materials and Devices},
volume = {1},
number = {2},
pages = {9370019},
keywords = {silicon monoxide, calcium silicate, volume expansion, anode, lithium-ion batteries},
url = {https://www.sciopen.com/article/10.26599/EMD.2023.9370019},
doi = {10.26599/EMD.2023.9370019},
abstract = {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.}
}