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Effect of Acid Leaching on Silicon Nanoparticles and Their Electrochemical Performance in Lithium-Ion Batteries

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In this work, crystalline Si nanoparticles are synthesized on a large scale via a low temperature molten salt method. The crystal morphologies and electrochemical properties of the samples after HCl and HF leaching are studied in detail. The electrochemical properties of the as-produced silicon samples, which are used as anode materials in lithium-ion batteries (LIBs), are evaluated. The final product, which contains more Si and less SiO2, improves cyclic stability because it buffers the volumetric effect of Si during lithiation/delithiation. The HF acid leach removes the impurity of SiO2. However, the prepared sample exhibits lower electrochemical properties. The sample with a low SiO2 content can deliver a capacity of 1503 mAh g−1 after 50 cycles at a higher current density of 1 A g−1, and the Coulombic efficiency is approximately 100%. However, the sample after HF acid leaching only delivers a discharge capacity of 389 mAh g−1 at 1 A g−1 after 50 cycles.
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Keywords: Cyclic Performance; Lithium-Ion Batteries; Molten Salt Preparation; Silicon Anode Material

Document Type: Research Article

Affiliations: 1: Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu 215500, PR China 2: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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