Publication Type
Journal
Journal Name
The Journal of Physical Chemistry C
Publication Date
Page Numbers
11083 to 11088
Volume
121
Issue
21
Abstract
We demonstrate the room temperature mechanochemical synthesis of highly defective LixSi anode materials and characterization of the Li transport. We probed the Li+ self-diffusion using quasi-elastic neutron scattering (QENS) to measure the Li self-diffusion in the alloy. Li diffusion was found to be significantly greater (3.0 x 10-6 cm2 s-1) than previously measured crystalline and electrochemically made Li-Si alloys; the energy of activation was determined to be 0.20 eV (19 kJ mol-1). Amorphous Li-Si structures are known to have superior Li diffusion to their crystalline counterparts; therefore, the isolation and stabilization of defective Li-Si structures may improve the utility of Si anodes for Li-ion batteries.
