Abstract
N-type silicon wafers with electrical resistivity of 0.001 Ω cm were ball-milled to powders and part of them was further mechanically crushed by sand-milling to smaller particles of nano-size. Both the sand-milled and ball-milled silicon powders were, respectively, mixed with graphite powder (silicon:graphite = 5:95, weight ratio) as anode materials for lithium ion batteries. Electrochemical measurements, including cycle and rate tests, present that anode using sand-milled silicon powder performed much better. The first discharge capacity of sand-milled silicon anode is 549.7 mAh/g and it is still up to 420.4 mAh/g after 100 cycles. Besides, the D50 of sand-milled silicon powder shows ten times smaller in particle size than that of ball-milled silicon powder, and they are 276 nm and 2.6 μm, respectively. In addition, there exist some amorphous silicon components in the sand-milled silicon powder excepting the multi-crystalline silicon, which is very different from the ball-milled silicon powder made up of multi-crystalline silicon only.
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Acknowledgements
This work is supported by China Postdoctoral Science Foundation (2016M592115), Jiangxi Postdoctoral Foundation (2015KY12), National Nature Science Foundation of China (61464007) and Nature Science Foundation of Jiangxi province (2015BAB207055).
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Yue, Z., Zhou, L., Jin, C. et al. N-type nano-silicon powders with ultra-low electrical resistivity as anode materials in lithium ion batteries. Appl. Phys. A 123, 417 (2017). https://doi.org/10.1007/s00339-017-1036-9
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DOI: https://doi.org/10.1007/s00339-017-1036-9