Abstract
Coulombic efficiency especially in the first cycle, cycling stability, and high-rate performance are crucial factors for commercial Li-ion batteries (LIBs). To improve them, in this work, Al2O3-coated natural graphite powder was obtained through a low-cost and facile sol-gel method. Based on a comparison of various coated amounts, 0.5 mol % Al(NO3)3 (vs mole of graphite) could bring about a smooth Al2O3 coating layer with proper thickness, which could act as a preformed solid electrolyte interface (SEI) to reduce the regeneration of SEI and lithium-ions consumption during subsequent cycling. Furthermore, we examined the advantages of Al2O3 coating by relating energy levels in LIBs using density functional theory calculations. Owing to its proper bandgap and lithium-ion conduction ability, the coating layer performs the same function as a SEI does, preventing an electron from getting to the outer electrode surface and allowing lithium-ion transport. Therefore, as a preformed SEI, the Al2O3 coating layer reduces extra cathode consumption observed in commercial LIBs.
| Original language | English |
|---|---|
| Pages (from-to) | 6512-6519 |
| Number of pages | 8 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 8 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 16 Mar 2016 |
| Externally published | Yes |
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Keywords
- alumina coating
- anodes
- DFT calculations
- energy levels
- lithium-ion batteries
- SEI
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Low-Cost Al2O3 Coating Layer As a Preformed SEI on Natural Graphite Powder to Improve Coulombic Efficiency and High-Rate Cycling Stability of Lithium-Ion Batteries. / Feng, Tianyu; Xu, Youlong; Zhang, Zhengwei; Du, Xianfeng; Sun, Xiaofei; Xiong, Lilong; Rodriguez, Raul; Holze, Rudolf.
In: ACS Applied Materials and Interfaces, Vol. 8, No. 10, 16.03.2016, p. 6512-6519.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low-Cost Al2O3 Coating Layer As a Preformed SEI on Natural Graphite Powder to Improve Coulombic Efficiency and High-Rate Cycling Stability of Lithium-Ion Batteries
AU - Feng, Tianyu
AU - Xu, Youlong
AU - Zhang, Zhengwei
AU - Du, Xianfeng
AU - Sun, Xiaofei
AU - Xiong, Lilong
AU - Rodriguez, Raul
AU - Holze, Rudolf
PY - 2016/3/16
Y1 - 2016/3/16
N2 - Coulombic efficiency especially in the first cycle, cycling stability, and high-rate performance are crucial factors for commercial Li-ion batteries (LIBs). To improve them, in this work, Al2O3-coated natural graphite powder was obtained through a low-cost and facile sol-gel method. Based on a comparison of various coated amounts, 0.5 mol % Al(NO3)3 (vs mole of graphite) could bring about a smooth Al2O3 coating layer with proper thickness, which could act as a preformed solid electrolyte interface (SEI) to reduce the regeneration of SEI and lithium-ions consumption during subsequent cycling. Furthermore, we examined the advantages of Al2O3 coating by relating energy levels in LIBs using density functional theory calculations. Owing to its proper bandgap and lithium-ion conduction ability, the coating layer performs the same function as a SEI does, preventing an electron from getting to the outer electrode surface and allowing lithium-ion transport. Therefore, as a preformed SEI, the Al2O3 coating layer reduces extra cathode consumption observed in commercial LIBs.
AB - Coulombic efficiency especially in the first cycle, cycling stability, and high-rate performance are crucial factors for commercial Li-ion batteries (LIBs). To improve them, in this work, Al2O3-coated natural graphite powder was obtained through a low-cost and facile sol-gel method. Based on a comparison of various coated amounts, 0.5 mol % Al(NO3)3 (vs mole of graphite) could bring about a smooth Al2O3 coating layer with proper thickness, which could act as a preformed solid electrolyte interface (SEI) to reduce the regeneration of SEI and lithium-ions consumption during subsequent cycling. Furthermore, we examined the advantages of Al2O3 coating by relating energy levels in LIBs using density functional theory calculations. Owing to its proper bandgap and lithium-ion conduction ability, the coating layer performs the same function as a SEI does, preventing an electron from getting to the outer electrode surface and allowing lithium-ion transport. Therefore, as a preformed SEI, the Al2O3 coating layer reduces extra cathode consumption observed in commercial LIBs.
KW - alumina coating
KW - anodes
KW - DFT calculations
KW - energy levels
KW - lithium-ion batteries
KW - SEI
UR - http://www.scopus.com/inward/record.url?scp=84962239172&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84962239172&partnerID=8YFLogxK
U2 - 10.1021/acsami.6b00231
DO - 10.1021/acsami.6b00231
M3 - Article
VL - 8
SP - 6512
EP - 6519
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 10
ER -