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Graphite particle for nonaqueous secondary battery, method for producing same, negative electrode, and nonaqueous secondary battery

A secondary battery and graphite particle technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of reduced cycle characteristics, increased specific surface area, and reduced initial efficiency, and achieve high input and output characteristics, high cycle characteristics, the effect of high capacity

Active Publication Date: 2016-08-17
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the studies of the inventors of the present invention, the following problems have been confirmed: since the material is hard when the molded body is crushed, the specific surface area becomes large, and the reactivity with the electrolyte cannot be suppressed, resulting in a decrease in initial efficiency and a decrease in cycle characteristics. reduce

Method used

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  • Graphite particle for nonaqueous secondary battery, method for producing same, negative electrode, and nonaqueous secondary battery
  • Graphite particle for nonaqueous secondary battery, method for producing same, negative electrode, and nonaqueous secondary battery
  • Graphite particle for nonaqueous secondary battery, method for producing same, negative electrode, and nonaqueous secondary battery

Examples

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Embodiment 1

[0223] Spherical natural graphite with a volume-based average particle diameter of 17 μm was used as raw graphite, and as a surface roughening process, a pulverization device composed of a rotor and a stator was used to pulverize at a peripheral speed of the rotor of 145 m / s and an input speed of 200 kg / hour. Graphite having a concave-convex structure on the surface was obtained. With respect to 100 parts by mass of the obtained graphite, 30 parts by mass of pitch as a raw material organic substance was mixed using a kneader. After molding the obtained mixture, it fired and carbonized at 1000 degreeC in an inert atmosphere, and also graphitized at 3000 degreeC. The obtained graphite molded body was subjected to coarse pulverization and fine pulverization to obtain a powder sample composed of graphite particles. For this sample, DBP oil absorption, specific surface area, Raman R value, pore volume Vi, total pore volume, O / C, tap density, and average particle diameter were meas...

Embodiment 2

[0226] As a surface roughening process, except having set the peripheral speed of the rotor to 145 m / sec, it carried out similarly to Example 1, and obtained the powder sample which consists of graphite particles. For this sample, evaluation of physical properties and battery characteristics, and SEM observation were carried out in the same manner as in Example 1. The results are shown in Table 1.

Embodiment 3

[0228] As a surface roughening process, except having set the peripheral speed of the rotor to 130 m / sec, it carried out similarly to Example 1, and obtained the powder sample which consists of graphite particles. For this sample, evaluation of physical properties and battery characteristics, and SEM observation were carried out in the same manner as in Example 1. The results are shown in Table 1.

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Abstract

The present invention provides a negative electrode material for a non-aqueous secondary battery with high capacity and good cycle characteristics. The negative electrode material for the non-aqueous secondary battery is graphite particles and satisfies the following three requirements (A), (B) and (C). (A) DBP oil absorption is not less than 0.42mL / g and not more than 0.85mL / g; (B) specific surface area is not less than 0.5m2 / g and not more than 6.5m2 / g; (C) Raman R value is not less than 0.03 and not more than 0.19 .

Description

technical field [0001] The present invention relates to graphite particles used in a non-aqueous secondary battery, a negative electrode formed using the graphite particle, and a non-aqueous 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 excellent high-current charge-discharge characteristics compared with nickel-cadmium batteries and nickel-metal hydride batteries, are attracting attention. In the past, the increase in the capacity of lithium-ion secondary batteries has been extensively studied. However, due to the increase in the demand for high-performance lithium-ion secondary batteries in recent years, it is required to meet further high capacity, high-current charge and discharge characteristics, and high-temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/133
CPCH01M4/133H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10H01M4/583
Inventor 布施亨宇尾野宏之赤坂哲
Owner MITSUBISHI RAYON CO LTD
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