Abstract
The solid electrolyte interphase (SEI), a passivation layer formed on electrodes, is critical to battery performance and durability. The inorganic components in SEI, including lithium carbonate (Li2CO3) and lithium fluoride (LiF), provide both mechanical and chemical protection, meanwhile control lithium ion transport. Although both Li2CO3 and LiF have relatively low ionic conductivity, we found, surprisingly, that the contact between Li2CO3 and LiF can promote space charge accumulation along their interfaces, which generates a higher ionic carrier concentration and significantly improves lithium ion transport and reduces electron leakage. The synergetic effect of the two inorganic components leads to high current efficiency and long cycle stability.
| Original language | English |
|---|---|
| Pages (from-to) | 2011-2016 |
| Number of pages | 6 |
| Journal | Nano Letters |
| Volume | 16 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 9 2016 |
Bibliographical note
Publisher Copyright:© 2016 American Chemical Society.
Funding
The authors acknowledge the support by the Assistant Secretary for Energy Efficiency and Renewable Energy, Vehicle Technologies Office of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, Subcontract No. 7056410 under the Batteries for Battery Materials Research (BMR) Program. Q.Z. is grateful for General Motors'' summer internship program. Partial Financial support from National Science Foundation (Award Number 1355438, Powering the Kentucky Bioeconomy for a Sustainable Future) is also gratefully acknowledged. The authors thank Dr. Nicolas J. Briot and Dr. Dali Qian in the Electron Microscopy Center of University of Kentucky for the TEM figures. J.P. and Y.T.C. acknowledge the hardware support from Center for Computational Sciences in University of Kentucky.
| Funders | Funder number |
|---|---|
| Office of Energy Efficiency and Renewable Energy | |
| Powering the Kentucky Bioeconomy | |
| U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China | 1355438 |
| U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China | |
| U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center | DE-AC02-05CH11231, 7056410 |
| U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center |
Keywords
- LiF/LiCO interface
- Lithium ion batteries
- electron leakage
- ionic conduction
- solid electrolyte interphase
- space charge
ASJC Scopus subject areas
- Bioengineering
- General Chemistry
- General Materials Science
- Condensed Matter Physics
- Mechanical Engineering