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This content will become publicly available on May 21, 2019

Title: A Novel Approach to Synthesize Micrometer-Sized Porous Silicon as a High Performance Anode for Lithium-Ion Batteries

Porous structured silicon (p-Si) has been recognized as one of the most promising anodes for Li-ion batteries. However, many available methods to synthesize p-Si are difficult to scale up due to their high production cost. Here we introduce a new approach to obtain spherical micrometer-sized silicon with unique porous structure by using a microemulsion of the cost-effective of silica nanoparticles and magnesiothermic reduction method. The spherical micron-sized p-Si particles prepared by this approach consist of highly aligned nano-sized silicon and exhibit a tap density close to that of bulk Si particles. They have demonstrated significantly improved electrochemical stability compared to nano-Si. Well controlled void space and a highly graphitic carbon coating on the p-Si particles enable good stability of the structure and low overall resistance, thus resulting in a Si-based anode with high capacity (~1467 mAh g –1 at 1 C), enhanced cycle life (370 cycles with 83% capacity retention), and high rate capability (~650 mAh g –1 at 5 C). Furthermore, this approach may also be generalized to prepare other hierarchical structured high capacity anode materials for constructing high energy density lithium ion batteries.
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  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2211-2855; PII: S221128551830363X
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nano Energy
Additional Journal Information:
Journal Name: Nano Energy; Journal ID: ISSN 2211-2855
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
Country of Publication:
United States
25 ENERGY STORAGE; silicon; anode; porous structure; nano pores; micrometer-sized silicon; Li ion batteries
OSTI Identifier: