To improve the rate capability and cyclability of natural graphite anode for Li-ion batteries,a novel modification approach was developed. The modification approach included two steps: ( a ) high-energy ball milling in a rotary autoclave containing alumina balls, H3 PO4 and ethanol; ( b ) coating with pyrolytic carbon from phenlic resin. The treated graphite shows obvious improvement compared with the original natural graphite in electrochemical properties such as cyclability and rate capability, especially at high current density. The primary reasons leading to the improvement in rate capability and cyclability are that the difiusion impedance of Li + in graphite is reduced due to the fact that P filtered into graphite layers can mildly increase interlayer distances, and the fact that the structural stability of graphite surface is enhanced since the coated pyrolytic carbon can depress the co-intercalation of solvtted lithium ion.
参考文献
| [1] | P Arora;R E White .Capacity Fade Mechamisms and Side Reactions in Lithium-Ion Batteries[J].Journal of the Electrochemical Society,1998,145(10):3647-3667. |
| [2] | K Tatsumi;N Iwashita;H Sakaebe;H Shioyama, et al.The Influence of the Graphitic Structure on the Electrochemical Characteristics for Anode of Secondary Lithium Batteries[J].Journal of the Electrochemical Society,1995,142(03):716-720. |
| [3] | H.Huang;E.M.Kelder;J.Schoonman .Graphite-metal oxide composites as anode for Li-ion batteries[J].Journal of Power Sources,2001(0):114-117. |
| [4] | G C Chung;S H Jun;K Y Lee;M H Kim .Effect of Structure on the Irreversible Capacity of Various Graphite Carbon Electrodes[J].Journal of the Electrochemical Society,1999,146(05):1664-1671. |
| [5] | K.Suzuki;T.Hamada .Effect of graphite surface structure on initial irreversible reaction in graphite anodes[J].Journal of the Electrochemical Society,1999(3):890-897. |
| [6] | Geun-Chang Chnng;Hynug-Jin Kim .Origin of Graphite Exfoliation An Investigation of the Important Role of Solvent Cointercalation[J].Journal of the Electrochemical Society,2000(12):4391-4398. |
| [7] | L H Shi;Q Wang;H Li et al.Electrochemical Performance of Ni-deposited Graphite Anodes for Lithium Secondary Batteries[J].Journal of Power Sources,2001,102:60-67. |
| [8] | K Kinoshita.Carbon Electrochemical and Physicochemical Properties[M].New York:John Wiley and Sons,Inc,1988 |
| [9] | Shi H.;Saidi MY.;Koksbang R.;Barker J. .STRUCTURE AND LITHIUM INTERCALATION PROPERTIES OF SYNTHETIC AND NATURAL GRAPHITE[J].Journal of the Electrochemical Society,1996(11):3466-3472. |
| [10] | H Morose;H Honbo;S Takeuchi .X-ray Photoelectron Spectroscopy Analyses of Lithium Intercalation and Alloying Reactions on Graphite Electrodes[J].Journal of Power Sources,1997,68:208-211. |
| [11] | K Skine;T Shimoyamada;R Takagi.in:Electrochemical Society Proceedings97-18Abstract 126[M].ParisFrance,1997 |
| [12] | Kunkun Guo;Qiumin Pan;Shibi Fang .Poly(acrylonitrile) Encapsulated Graphite As Anode Materials for Lithium Ion Batteries[J].Journal of Power Sources,2002,111:350-356. |
| [13] | Qiu Weihua;Lu Shigang;Liu Qingguo;Zhang Gang .Correlation between the structure and electrochemical properties of carbon materials[J].Solid state ionics,1999(1/4):73-77. |
| [14] | I Kuribayashi;M Yokoyama;M Yamashita .Battery Characteristics with Various Varbonaceous Materials[J].Journal of Power Sources,1995,54:1-5. |
| [15] | M. Winter;P. Novak;A. Monnier .Graphites for lithium-ion cells: The correlation of the first-cycle charge loss with the brunauer-emmett-teller surface area[J].Journal of the Electrochemical Society,1998(2):428-436. |
| [16] | R Fong;U Von Sacken;J R Dahn .Studies of Lithium Intercalation into Carbons Using Nonaquous Electrochemical Cells[J].Journal of the Electrochemical Society,1990,137:2009-2013. |
| [17] | J O Besenhard;M Winter;J Yang;W Biberacher .Filming Mechanism of Lithium-carbon Anodes in Organic and Inorganic Electrolytes[J].Journal of Power Sources,1995,54:228-231. |
| [18] | D Aurbach;Y Ein-Eli;OChusid .The Correlation Between the Surface Chemistry and the Performance of Li-Carbon Intercalation Anodes for Rechargeable "Rocking-Chair" Type Batteries[J].Journal of the Electrochemical Society,1994,141(03):603-610. |
| [19] | W W Huang;R Frech .In Situ Raman Studies of Graphite Surface Structures during Lithium Electrochemical Intercalation[J].Journal of the Electrochemical Society,1998,145:765-770. |
| [20] | E.Barsoukov;J.H.Kim;J.H.Kim;C.O.Yoon;H.Lee .Kinetics of lithium intercalation into carbon anodes: in situ impedance investigation of thickness and potential dependence[J].Solid state ionics,1999(3/4):249-261. |
| [21] | Chang young-Churl;Sohn Hun-Joon .Electrochemical Impedance Analysis for Lithium Ion Intercalation into Graphitized Carbons[J].Journal of the Electrochemical Society,2000(1):50-58. |
| [22] | P Yu;J A Ritter;B N Popov .Ni-composite Microencapsulated Graphite as the Negative Electrode in Lithium-ion Batteries,Ⅱ Electrochemical Impedance and Seif-discharge Studies[J].Journal of the Electrochemical Society,2000,147(06):2081-2085. |
| [23] | N. Takami;A. Satoh;T. Ohsaki;M. Kanda .Large hysteresis during lithium insertion into and extraction from high-capacity disordered carbons[J].Journal of the Electrochemical Society,1998(2):478-482. |
| [24] | D. Aurbach;B. Markovsky;M.D. Levi;E. Levi. .New insights into the interactions between electrode materials and electrolyte solutions for advanced nonaqueous batteries[J].Journal of Power Sources,1999(0):95-111. |
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