Carbon material, method for producing carbon material, and non-aqueous secondary battery using carbon material

一种二次电池、非水系的技术，应用在二次电池、电池电极、电路等方向，能够解决输入输出特性下降、充放电不可逆容量增加、循环特性下降等问题

Active Publication Date: 2017-08-29
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the density of the active material layer containing the negative electrode material is increased in order to achieve higher capacity, the irreversible charge-discharge capacity during the initial cycle increases, the input-output characteristics decrease, and the cycle characteristics decrease due to the destruction and deformation of the material. such problem

Method used

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  • Carbon material, method for producing carbon material, and non-aqueous secondary battery using carbon material
  • Carbon material, method for producing carbon material, and non-aqueous secondary battery using carbon material
  • Carbon material, method for producing carbon material, and non-aqueous secondary battery using carbon material

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Experimental program
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Embodiment

[0581] Next, specific embodiments of the present invention will be described in more detail through experimental examples, but the present invention is not limited to these examples. In addition, "composite carbon material" is only described as "carbon material".

[0582] Hereinafter, a first experimental example (experimental example A) of the present invention will be shown.

[0583]

[0584] Using the experimental example or the graphite particles of the experimental example, an active material layer density of 1.35 ± 0.03g / cm was produced. 3 plate of the active material layer. Specifically, in 50.00 ± 0.02 g of the negative electrode material, 50.00 ± 0.02 g of 1 mass % carboxymethyl cellulose sodium salt solution (0.500 g in terms of solid content) and styrene-butane with a weight average molecular weight of 270,000 1.00±0.05 g (0.5 g in terms of solid content) of an aqueous vinyl rubber dispersion was stirred for 5 minutes with a mixing mixer manufactured by Keyence,...

experiment example A1

[0606] Unbaked coke particles with a d50 of 9.8 μm, a d10 of 4.4 μm, and a d90 / d10 of 3.7 as a precursor of the bulk mesophase artificial graphite particle (A) and a graphite particle (B) with a d50 of 5.9 μm and a length of Flake-shaped natural graphite particles with a diameter ratio of 8 are mixed at a mass ratio of 80:20, and then applied at a rotor peripheral speed of 85 m / s for 5 minutes using a mixing system NHS-1 type manufactured by Nara Machinery Manufacturing Co., Ltd. Based on mechanical action The impact, compression, friction, and shear forces are used for granulation and spheroidization.

[0607] The obtained composite graphite particle precursor was calcined in an electric furnace at 1000°C for 1 hour under a nitrogen atmosphere, and then further graphitized in a small electric furnace at 3000°C under the flow of Ar to obtain a monolithic mesophase artificial graphite particle (A) A composite carbon material compounded with graphite particles (B). When the cro...

experiment example A4

[0610] Except for the fact that only unbaked coke particles with d50 of 9.8 μm, d10 of 4.4 μm, and d90 / d10 of 3.7, which are the precursors of bulk mesophase artificial graphite particles (A), were spheroidized, according to the experimental example A1 obtained carbon material by the same method. About the obtained sample, the same measurement as Test Example A1 was performed, and the result is shown in Table A1.

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Abstract

The present invention provides a carbon material which enables the achievement of a nonaqueous secondary battery that has high capacity, high initial efficiency and low charge resistance, while exhibiting excellent productivity. Consequently, the present invention stably and efficiently provides a high-performance nonaqueous secondary battery. A composite carbon material for nonaqueous secondary batteries, which contains at least (A) bulk mesophase artificial graphite particles and (B) graphite particles having an aspect ratio of 5 or more, and which is capable of absorbing and desorbing lithium ions. This composite carbon material for nonaqueous secondary batteries is characterized in that: on a part of the surface of each bulk mesophase artificial graphite particle (A), the graphite crystal lamellar structures of the graphite particles (B) are aligned in the same direction as the outer circumferential surface of the bulk mesophase artificial graphite particle (A); and the average circularity thereof is 0.9 or more.

Description

technical field [0001] The present invention relates to a carbon material and a nonaqueous secondary battery using the carbon material. Background technique [0002] In recent years, the demand for high-capacity secondary batteries has gradually increased along with the miniaturization of electronic equipment. In particular, lithium-ion secondary batteries, which have higher energy density than nickel-cadmium batteries and nickel-hydrogen batteries and have excellent high-current charge-discharge characteristics, have attracted attention. At present, the high capacity of lithium-ion secondary batteries has been extensively studied. In recent years, the demand for further performance of lithium-ion secondary batteries has increased. High capacity, high input and output, and long life. [0003] In lithium ion secondary batteries, it is known to use a carbon material such as graphite as an active material for negative electrodes. Wherein, when using graphite with a large deg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/36C01B32/205
CPCC01B32/20H01M4/1393H01M4/364H01M4/587H01M10/0525C01B32/205Y02E60/10H01M4/366H01M4/625H01M4/362H01M4/64H01M2004/027
Inventor 山田俊介石渡信亨赤坂哲曾我巌田中秀明布施亨诸隈慎吾西尾晃一
Owner MITSUBISHI CHEM CORP
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