Assessment of Surface Heterogeneity: a Route to Correlate and Quantify the 1 st Cycle Irreversible Capacity Caused by SEI Formation to the Various Surfaces of Graphite Anodes for Lithium Ion Cells

Natural graphite anodes were treated by different methods to improve their cyclability. We tried following methods; heat-treatment at 550oC for graphite powder, addition of carbon black for electrode and VC (vinylene carbonate) in electrolyte. All methods decreased capacity fade rate during constant cycling. The addition of carbon black decreased capacity fade significantly but increased irreversible capacity much at first cycle. Heat-treatment and VC were also effective for cycling and irreversible capacity loss.

Download Full-text

Kinetic Monte Carlo simulation of surface heterogeneity in graphite anodes for lithium-ion batteries: Passive layer formation

Proceedings of the 2011 American Control Conference ◽

10.1109/acc.2011.5990792 ◽

2011 ◽

Cited By ~ 2

Author(s):

Ravi N. Methekar ◽

Paul W. C. Northrop ◽

Kejia Chen ◽

Richard D. Braatz ◽

Venkat R. Subramanian

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Lithium Ion Batteries ◽

Kinetic Monte Carlo ◽

Lithium Ion ◽

Surface Heterogeneity ◽

Passive Layer ◽

Layer Formation ◽

Kinetic Monte Carlo Simulation ◽

Graphite Anodes

Download Full-text

Studying the Origin and Mechanism of Irreversible Capacity in Lithium-Ion Cells

ECS Meeting Abstracts ◽

10.1149/ma2007-02/10/742 ◽

2007 ◽

Keyword(s):

Lithium Ion ◽

Irreversible Capacity ◽

Lithium Ion Cells

Download Full-text

Passive-Film Formation on Metal Substrates in IM LiPF6/EC-DMC Solutions

MRS Proceedings ◽

10.1557/proc-496-469 ◽

1997 ◽

Vol 496 ◽

Author(s):

Ronald A. Guidotti ◽

Gerald C. Nelson

Keyword(s):

Passive Film ◽

Film Formation ◽

Ethylene Carbonate ◽

Lithium Ion ◽

304 Stainless Steel ◽

Potential Range ◽

Metal Substrates ◽

Capacity Loss ◽

Lithium Ion Cells ◽

Graphite Anodes

ABSTRACTThe initial irreversible capacity loss in lithium-ion cells has been attributed to passive-film formation on the carbon and graphite anodes during the first intercalation. We have examined the nature of these passive films on select metal substrates. We studied film formation on Cu, 304 stainless steel, and Mo cycled in a 1M LiPF6/ethylene carbonate (EC)-dimethyl carbonate (DMC) solution (1:1 v/v) over a potential range of 3 V to below 0 V. Film formation occurs readily on each of the metals and involves both solvent and salt species. The composition, thickness, and distribution of the films depends strongly on the substrate. The redox processes that occur during film formation and the potential for Li plating are highly dependent on the substrate composition.

Download Full-text