Carbon material and negative electrode for nonaqueous secondary battery and nonaqueous secondary battery

A secondary battery, non-aqueous technology, applied in the direction of secondary batteries, non-aqueous electrolyte storage batteries, battery electrodes, etc., can solve the problems of unbalanced, fully satisfying the initial efficiency, etc., and achieve the effect of excellent initial capacity and excellent cycle characteristics

Active Publication Date: 2013-12-18
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned carbon materials cannot fully satisfy the required properties such as initial efficiency, cycle characteristics, and load characteristics in a well-balanced manner, and improvement is required.

Method used

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  • Carbon material and negative electrode for nonaqueous secondary battery and nonaqueous secondary battery
  • Carbon material and negative electrode for nonaqueous secondary battery and nonaqueous secondary battery
  • Carbon material and negative electrode for nonaqueous secondary battery and nonaqueous secondary battery

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Experimental program
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Embodiment 1～4

[0258] The natural graphite particles (a) and the carbonaceous material composite particles (b), that is, the graphitic material-coated graphite whose surface is roughened as carbonaceous material-coated graphite are expressed in Table 1 at the mass ratio (a) / (a+b )mix. A negative electrode was produced using the obtained carbon material, and a laminated battery was produced by the method described above, and the 200-cycle retention rate was calculated from the initial discharge capacity and the discharge capacity at the 200th cycle.

[0259] In addition, discharge rate characteristics were studied based on the ratio of the discharge capacity at a discharge rate of 1C after charging to 4.2V at 0.5C to the discharge capacity at a discharge rate of 0.2C after charging to 4.2V at 0.5C.

[0260] The results are shown in Table 1.

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PUM

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Abstract

The purpose of the present invention is to provide a carbon material for a nonaqueous secondary battery for fabricating a nonaqueous secondary battery, and among the same, a lithium ion secondary battery, having superior cycle characteristics in addition to superior high initial capacity and rate characteristics. The present invention relates to a carbon material for a nonaqueous secondary battery that contains natural graphite particles (a) with an internal porosity of 1-20% and carbonaceous composite particles (b) for which dibutyl phthalate oil absorption is 0.31-0.85 mL / g or less.

Description

technical field [0001] The present invention relates to a carbon material used in a nonaqueous secondary battery, a negative electrode formed using the material, and a lithium ion secondary battery having the negative electrode. Background technique [0002] In recent years, along with miniaturization of electronic equipment, the demand for high-capacity secondary batteries has been increasing. In particular, lithium-ion secondary batteries, which have higher energy density and better high-current charge and discharge characteristics than nickel-cadmium batteries and nickel-metal hydride batteries, are attracting attention. [0003] It is known to use graphite as a carbon material for lithium ion secondary batteries. In particular, if graphite with a high degree of graphitization is used as a negative electrode active material for lithium-ion secondary batteries, the theoretical lithium storage capacity close to graphite, that is, a capacity of 372mAh / g can be obtained. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/133H01M4/36
CPCH01M4/133H01M4/1393H01M4/366H01M4/587H01M10/0525H01M2004/021Y02E60/10H01M4/36H01M10/052
Inventor 石渡信亨山田俊介宇尾野宏之
Owner MITSUBISHI RAYON CO LTD
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