| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a negative electrode material capable of improving cycle characteristics by controlling the stress accompanying the storing-releasing reaction of lithium ion at charge and discharge, and capable of improving high rate charge and discharge characteristics by making lithium ion storing and releasing reaction accompanying charging and discharging smoothly proceed, and to provide a negative electrode using the negative electrode material, and further, a lithium ion battery and a lithium polymer battery capable of heightening the energy density of the battery. <P>SOLUTION: The negative electrode material contains inorganic particles 11 containing at least one element chosen from Si, Ge, Mg, Sn, Pb, Ag, Al, Zn, Cd, Sb, Bi, In, Ca, Fe, Ni, Co, and Mn, and a carbon material 12. The carbon material has a carbon nanofiber 13 as a main component, and the carbon nanofiber has an average diameter of 20 to 500 nm, the length of not less than 1,000 nm, and an aspect ratio of not less than 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
