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 × 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.
Original language | English |
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Pages (from-to) | 11083-11088 |
Number of pages | 6 |
Journal | Journal of Physical Chemistry C |
Volume | 121 |
Issue number | 21 |
DOIs | |
State | Published - Jun 1 2017 |
Funding
Research supported by the Office of Basic Energy Science (BES-DOE) Division of Materials Science and Engineering (R.L.S., M.L.L., N.J.D., G.M.V., synthesis, characterization) and as part of a user proposal by Oak Ridge National Laboratory's Spallation Neutron Source (SNS), which is sponsored by the Scientific User Facilities Division, BES-DOE (S.O.D., Y.Q.C., L.L.D., J.F.B., M.D.). This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.