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

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.

Electrochemical characterization of bi-layered graphite anodes combining high and low porosity in lithium-ion cells to improve cell performance

2021 ◽  
pp. 138966
Author(s):  
Daniel Müller ◽  
Imanol Landa-Medrano ◽  
Aitor Eguia-Barrio ◽  
Iker Boyano ◽  
Idoia Urdampilleta ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Electrochemical Characterization ◽  
Cell Performance ◽  
Lithium Ion Cells ◽  
Graphite Anodes ◽  
Low Porosity

Understanding the Capacity Loss in LiNi0.5Mn1.5O4–Li4Ti5O12 Lithium-Ion Cells at Ambient and Elevated Temperatures

2018 ◽  
Vol 122 (21) ◽  
pp. 11234-11248 ◽  
Author(s):  
Burak Aktekin ◽  
Matthew J. Lacey ◽  
Tim Nordh ◽  
Reza Younesi ◽  
Carl Tengstedt ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Lithium Ion ◽  
Capacity Loss ◽  
Lithium Ion Cells

Electrochemical Comparison of Chemically or Physically Modified Natural Graphite Anode for Lithium-Ion Batteries

2007 ◽  
Vol 124-126 ◽  
pp. 995-998
Author(s):  
Joong Pyo Shim ◽  
Hong Ki Lee ◽  
Byung Ho Song
Keyword(s):  
Heat Treatment ◽  
Carbon Black ◽  
Lithium Ion ◽  
Graphite Powder ◽  
Capacity Fade ◽  
Irreversible Capacity ◽  
Natural Graphite ◽  
Capacity Loss ◽  
Graphite Anodes ◽  
Powder Addition

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.

Preparation and Characterization of Tin/Carbon Composites for Lithium-Ion Cells

2002 ◽  
Vol 730 ◽  
Author(s):  
Ronald A. Guidotti ◽  
David J. Irvin ◽  
William R. Even ◽  
Karl Gross
Keyword(s):  
Anode Materials ◽  
Electroless Deposition ◽  
Ethylene Carbonate ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Lithium Ion Cells ◽  
Disordered Carbon ◽  
Li Ion ◽  
Organic Precursors

AbstractA number of Sn/C composites were prepared for evaluation as anode materials for Li-ion cells. In one case, samples were prepared by incorporation of Sn species into organic precursors that were then pyrolyzed under an Ar/H2 cover gas to prepare the Sn/C composites. They were also prepared by decoration of various types of carbon with nanoparticles of Sn by electroless deposition using hydrazine. The carbons examined included a disordered carbon prepared in house from poly(methacrylonitrile), a mesocarbon microbead (MCMB) carbon, and a platelet graphite. The Sn/C composites were examined by x-ray diffraction (XRD) and scanning electron microscopy (SEM) and were also analyzed for Sn content. They were then tested as anodes in three-electrode cells against Li metal using 1M LiPF6 in ethylene carbonate (EC)/dimethyl carbonate (DMC) solution. The best overall electrochemical performance was obtained with a Sn/C composite made by electroless deposition of 10% Sn onto platelet graphite.

scholarly journals Effect of overcharge on lithium-ion cells: Silicon/graphite anodes

2019 ◽  
Vol 432 ◽  
pp. 73-81 ◽  
Author(s):  
Ira Bloom ◽  
Nancy Dietz Rago ◽  
Yangping Sheng ◽  
Jianlin Li ◽  
David L. Wood ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Lithium Ion Cells ◽  
Graphite Anodes
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