| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance safety of a lithium ion secondary battery. <P>SOLUTION: A negative electrode of the lithium ion secondary battery is made of a negative active material layer and a current collector. The negative active material layer contains, as the main component, carbon in which a spacing of (002) planes d<SB>002</SB>measured with an X-ray diffraction device (XRD) is 0.340-0.390 nm, and the volume resistivity of the negative active material layer is 1×10<SP>-1</SP>to 1×10<SP>2</SP>Ωcm. Alternatively, carbon in which a spacing of (002) planes d<SB>002</SB>measured with the X-ray diffraction device (XRD) is not less than 0.3348 nm and less than 0.340 nm is contained as the main component, and the volume resistivity of the negative active material layer is 1×10<SP>-2</SP>to 1×10<SP>2</SP>Ωcm. <P>COPYRIGHT: (C)2011,JPO&INPIT |
