Lithium Diffusion in Graphitic Carbon
By Kristin A. Persson, V. Sethuraman, Laurence Hardwick, Y. Hinuma, Y. Meng, Anton Van der Ven, Venkat Srinivasan, R. Kostecki, Gerbrand Ceder. 2010
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Graphiticcarboniscurrentlyconsideredthestate-of-the-artmaterial for the negative electrode in lithium ion cells, mainly due to its high reversibility and low operating potential. However, carbon anodes exhibit mediocre charge/ discharge rate performance, which contributes to severe transport-induced sur- face structural damage upon prolonged cycling and limits the lifetime of the cell. Lithium bulkdiffusion in graphitic carbon is not yet completely understood, partly due to the complexity of measuring bulk transport properties in finite-sized nonisotropic particles. To solvethis problem forgraphite, weuse the Devanathan- Stachurski electrochemical methodology combined with ab initio computations to deconvolute and quantify the mechanism of lithium ion diffusion in highly oriented pyrolytic graphite (HOPG). The results reveal inherent high lithium ion diffusivityinthedirectionparalleltothegrapheneplane(∼10 -7 -10 -6 cm 2 s -1 ),as comparedtosluggishlithiumiontransportalonggrainboundaries(∼10 -11 cm 2 s -1 ), indicating the possibility of rational design of carbonaceous materials and com- posite electrodes with very high rate capability. SECTION Energy Conversion and Storage
Subfields: Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/568230d96938be8065bf25d452dba713eedfeb03
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