Composite anode material for lithium ion battery with low sensitivity to water

Here we demonstrate for the first time a novel kind of anode material with low sensitivity to water, which consists of natural graphite and deposited copper. Through measurement of X-ray photoelectron spectroscopy, thermogravimetric and differential thermal analysis and high resolution electron microscopy, it is found that copper exists at the surface of natural graphite in the forms of metallic copper and copper carbides. Since the deposited copper covers and removes some active sites at the surface of natural graphite, which absorbs water relatively easily, cycling behavior in the presence of high humidity (1000 ppm H2O) is improved much. Concomitantly, reversible capacity enhances due to alloying of copper with lithium.

[1]  B. Liedberg,et al.  An infrared and electrical conductance study of V2O5/SIO2-TIO2 catalysts active for the reduction of NO by NH3 , 1989 .

[2]  Ki-Young Lee,et al.  Effect of Surface Structure on the Irreversible Capacity of Various Graphitic Carbon Electrodes , 1999 .

[3]  P. Cowache,et al.  Electroplating of CuxS on CdS , 1984 .

[4]  D. Aurbach,et al.  The Use of EQCM for the Study of Nonactive Metal Electrodes in Propylene Carbonate ‐ LiAsF6 Solutions Significance of the Data Obtained , 1995 .

[5]  J. Vinkevičius,et al.  Investigations of the interaction between Cu2−xS coating and Ag(I) ions using cyclic voltammetry and X-ray photoelectron spectroscopy , 1998 .

[6]  H. Fujimoto,et al.  Electrochemical Insertion of Lithium into Carbon Synthesized from Condensed Aromatics , 1996 .

[7]  Yuping Wu,et al.  Effects of nitrogen on the carbon anode of a lithium secondary battery , 1999 .

[8]  M. Barbooti.  Thermal behaviour of copper oxides and copper sulphate in the presence of carbon , 1984 .

[9]  Doron Aurbach,et al.  The electrochemical behavior of selected polar aprotic systems , 1989 .

[10]  Tsutomu Miyasaka,et al.  Tin-Based Amorphous Oxide: A High-Capacity Lithium-Ion-Storage Material , 1997 .

[11]  M. Endo,et al.  A Mechanism of Lithium Storage in Disordered Carbons , 1994, Science.

[12]  S. G. Oh,et al.  In situ electron microscopy investigation of the behavior of supported cobalt particles , 1991 .

[13]  Eishun Tsuchida,et al.  Effects of catalytic oxidation on the electrochemical performance of common natural graphite as an anode material for lithium ion batteries , 2000 .

[14]  R. T. Yang,et al.  Mechanism of catalyzed graphite oxidation by monolayer channeling and monolayer edge recession , 1989 .

[15]  M. Thackeray,et al.  Copper-tin anodes for rechargeable lithium batteries : an example of the matrix effect in an intermetallic system. , 1998 .

[16]  T. Takamura,et al.  Enhancement of Li doping/undoping reaction rate of carbonaceous materials by coating with an evaporated metal film , 1999 .

[17]  Nobuyuki Imanishi,et al.  Charge‐Discharge Characteristics of Mesophase‐Pitch‐Based Carbon Fibers for Lithium Cells , 1993 .