The effects of near surface and bulk microstructure on lithium intercalation of disordered, ``hard'' carbons
Disordered carbons were synthesized at 700 C from methacrylonitrile-divinylbenzene precursors. The disorder, even at the free surface, was confirmed with TEM. These powdered carbons were subjected to rapid surface heating by a pulsed infrared laser. While the bulk structure remained essentially unchanged, there was substantial surface reconstruction to a depth of 0.25 {micro}m after heating (5.9 W average power at 10Hz, 10 ns pulse width, 1,064nm wavelength). The surface ordering appears similar to the bulk microstructure of carbons isothermally annealed at 2,200 C (i.e., turbostratic). Improvements were observed in first cycle irreversible loss, rate capability, and coulombic efficiencies of the reconstructed carbons, relative to the untreated carbon.
- Research Organization:
- Sandia National labs., Livermore, CA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 20019195
- Resource Relation:
- Conference: 1997 Materials Research Society Fall Meeting, Boston, MA (US), 12/01/1997--12/05/1997; Other Information: PBD: 1998; Related Information: In: Materials for electrochemical energy storage and conversion II -- Batteries, capacitors and fuel cells. Materials Research Society symposium proceedings, Volume 496, by Ginley, D.S.; Doughty, D.H.; Scrosati, B.; Takamura, T.; Zhang, Z.J. [eds.], 702 pages.
- Country of Publication:
- United States
- Language:
- English
Similar Records
NMR strategies for the structural investigation of lithium-intercalated glassy carbons
The Effect of Laser Surface Reconstruction of Disordered Carbons on Performance