Effect of Phosphorus-Doping on Electrochemical Performance of Silicon Negative Electrodes in Lithium-Ion Batteries

• DOI: 10.1021/acsami.6b00386
• Publication Date: 2016-03-03T14:18:06Z
• Authors: Yasuhiro Domi; Hiroyuki Usui; Masahiro Shimizu; Yuta Kakimoto; Hiroki Sakaguchi
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

The effect of phosphorus (P)-doping on the electrochemical performance Si negative electrodes in lithium-ion batteries was investigated. Field-emission scanning electron microscopy used to observe changes surface morphology. Surface crystallinity and phase transition before after a charge–discharge cycle were investigated by Raman spectroscopy X-ray diffraction. Li insertion energy into also calculated based computational chemistry. results showed that low P concentration 124 ppm has meaningful influence properties electrode; is improved P-doping Si. suppresses morphology electrode during cycle. increases with an increase concentration; P-doped energetically unfavorable, which indicates crystal lattice shrinks as result replacement some atoms smaller atoms, therefore, it more difficult insert These reveal suppression reduces large change volume prevents from disintegrating, helps improve otherwise poor electrode.