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Project TitleCrumpled Graphene-Encapsulated Si Nanoparticles for Lithium Ion Battery Anodes
Track Code2013-048
Short Description

A rapid, high-throughput method to prepare crumpled capsules of graphene-wrapped Si nanoparticles for Li ion battery anode applications. #materials #graphene/graphite #energy #batteries #nanotechnology

Abstract

Northwestern researchers developed a rapid, high-throughput one-step method to fabricate composite capsules made of Si nanoparticles wrapped by crumpled graphene shells. The large volume expansion of Si as a battery anode material upon the insertion of the cathode ions (Li) leads to particle surface cracking and the deposition of an insulation layer, which causes drastic battery performance deterioration. As opposed to native Si particles, the folds in the crumpled graphene shells can accommodate the volume fluctuation of the encapsulated Si. As a result, the composite capsules have greatly improved performance as Li ion battery anode in terms of capacity, cycling stability and coulombic efficiency. 

              Figure 1. Scanning electron microscopic images of composite capsules. 

 Figure 2. Performance comparison between encapsulated Si and native Si particles 

 
TagsENERGY: batteries, MATERIALS: graphene/graphite, nanotechnology: nanoparticles
 
Posted DateAug 7, 2014 12:58 PM

Inventor(s)

Jiaxing Huang* 
Hee Dong Jang 
Jiayan Luo 

Applications

Hi-performance Li ion batteries 

Advantages

  • Greatly improves Li ion battery performance in terms of capacity, cycling stability and coulombic efficiency 
  • Rapid, facile and high-throughput 
  • Allows continuous mode of operation and is readily scalable
  • No requirement of extensive engineering of Si nanoparticles 
  • Concept can be extended to envelop expandable particles in other applications

Publication

IP Status

A U.S. patent application has been filed. 

Contact Information

Sarah Kamper, PhD
Invention Associate
(p) 847-491-5095
(e) sarah.kamper@northwestern.edu

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