Carbonaceous material for non-aqueous electrolyte secondary battery negative electrode

A non-aqueous electrolyte, secondary battery technology, used in battery electrodes, circuits, electrical components, etc., can solve the problems of poor charge-discharge repeatability and graphite crystal damage of secondary batteries, and achieve excellent charge-discharge cycle characteristics and discharge capacity. High and fast charging and discharging effect

Inactive Publication Date: 2013-11-27
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in automotive applications, in order to cope with long-term use and seek to achieve a life span of more than 10 years, graphite or graphitizable carbonaceous materials with developed graphite structures are prone to graphite crystals due to repeated doping and dedoping of lithium. The secondary battery made of this carbonaceous material has poor charge and discharge repeatability and is not suitable for automotive use.

Method used

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  • Carbonaceous material for non-aqueous electrolyte secondary battery negative electrode
  • Carbonaceous material for non-aqueous electrolyte secondary battery negative electrode
  • Carbonaceous material for non-aqueous electrolyte secondary battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Put 70kg of petroleum-based pitch with a softening point of 205°C and an H / C atomic ratio of 0.65 and 30kg of naphthalene into a pressure-resistant container with a stirring blade and an outlet nozzle and an internal volume of 300 liters, heat, melt and mix at 190°C, and then cool To 80~90°C, pressurize the pressure vessel with nitrogen gas, extrude the contents from the outlet nozzle, and obtain a rope-shaped molded body with a diameter of about 500 μm. Next, the rope-shaped molded body is pulverized so that the ratio (L / D) of the diameter (D) to the length (L) becomes about 1.5, and the obtained pulverized product is charged into a polymer dissolved in 0.53% by mass heated to 93°C. In an aqueous solution of vinyl alcohol (saponification degree 88%), stir to disperse and cool to obtain spherical asphalt molding slurry. After most of the water was removed by filtration, naphthalene in the asphalt formed body was extracted and removed with n-hexane in an amount about 6 t...

Embodiment 2

[0099] Carbonaceous material 2 was produced in the same manner as in Example 1, except that the precalcination temperature was set at 500°C.

Embodiment 3

[0101] Carbonaceous material 3 was produced in the same manner as in Example 1, except that the temperature of preliminary calcination was set at 600°C.

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Abstract

The purpose of the present invention is to provide a carbonaceous material for a non-aqueous electrolyte secondary battery negative electrode, which has large charge-discharge capacity, high charge-discharge efficiency and excellent charge-discharge cycle properties. The purpose is achieved by a carbonaceous material for a non-aqueous electrolyte secondary battery negative electrode, characterized in that the average interlayer spacing on face (002) is 0.365-0.40 nm as measured by an X-ray diffraction method, no exothermic peak appears in a temperature region of 620 DEG C or lower as measured by a differential thermal analysis under an air atmosphere, the BET specific surface area is 1-7 m2 / g, the average particle diameter (D50) is 5-25 micrometer, and the (D90-D10) / D50 ratio is 1.05 or less.

Description

technical field [0001] The invention relates to a carbonaceous material for a negative electrode of a non-aqueous electrolyte secondary battery and a manufacturing method thereof. According to the present invention, it is possible to provide a carbonaceous material for a negative electrode of a non-aqueous electrolyte secondary battery having a large charge-discharge capacity, high charge-discharge efficiency, and excellent charge-discharge cycle characteristics. Background technique [0002] In recent years, non-aqueous electrolyte secondary batteries (such as lithium-ion secondary batteries) have taken advantage of their small size and light weight in electric vehicles (EVs) powered only by an engine, or hybrid vehicles that combine an internal combustion engine and an engine. It is expected to spread in automotive applications such as electric vehicles (HEV). In particular, for electric vehicles, it is necessary to make the driving distance on a single charge close to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587C01B31/02C01B32/336
CPCY02E60/12H01M4/587C01B31/10C01B31/082C01B31/02C01B32/05Y02E60/50Y02E60/10C01B32/336C01B32/33H01M2004/8684
Inventor 今治诚多田靖浩园部直弘
Owner KUREHA KAGAKU KOGYO KK
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