Enhanced performance of graphite anode materials by AlF3 coating for lithium-ion batteries

Journal Article · Fri Apr 27 00:00:00 EDT 2012 · Journal of Materials Chemistry

DOI:https://doi.org/10.1039/c2jm31015e· OSTI ID:1043101

Ding, Fei; Xu, Wu; Choi, Daiwon; Wang, Wei; Li, Xiaolin; Engelhard, Mark H; Chen, Xilin; Yang, Zhenguo; Zhang, Jiguang

In order to form the stable surface film and to further enhance the long-term cycling stability of the graphite anodes of lithium-ion batteries, the surface of graphite powders has been modified by AlF3 coating through chemical precipitation method. The AlF3-coated graphite shows no evident changes in the bulk structure and a thin AlF3-coating layer of about 2 nm thick is found to uniformly cover the graphite particles with 2 wt% AlF3 content. However, it delivers a higher initial discharge capacity and largely improved rate performances compared to the pristine graphite. Remarkably, AlF3 coated graphite demonstrated a much better cycle life. After 300 cycles, AlF3 coated graphite and uncoated graphite show capacity retention of 92% and 81%, respectively. XPS measurement shows that a more conductive solid electrode interface (SEI) layer was formed on AlF3 coated graphite as compared to uncoated graphite. SEM monograph also reveals that the AlF3-coated graphite particles have a much more stable surface morphology after long-term cycling. Therefore, the improved electrochemical performance of AlF3 coated graphite can be attributed to a more stable and conductive SEI formed on coated graphite anode during cycling process.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1043101
• Report Number(s): PNNL-SA-85418; JMACEP; 40125; TE1400000; TRN: US201213%%81
• Journal Information: Journal of Materials Chemistry, Vol. 22, Issue 25; ISSN 0959-9428
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANODES
CAPACITY
COATINGS
ELECTRODES
ELECTRIC BATTERIES
GRAPHITE
LITHIUM IONS
MORPHOLOGY
PERFORMANCE
PRECIPITATION
RETENTION
STABILITY
SURFACE PROPERTIES
X-RAY PHOTOELECTRON SPECTROSCOPY
Li ion battery
graphite
alf3coating
anode
Environmental Molecular Sciences Laboratory