Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, negative electrode for nonaqueous-electrolyte secondary battery, nonaqueous-electrolyte secondary battery, and vehicle

A non-aqueous electrolyte, secondary battery technology, applied in secondary batteries, battery electrodes, negative electrodes, etc., can solve problems such as the risk of metal lithium precipitation, and the insufficient input and output characteristics of secondary batteries.

Inactive Publication Date: 2016-11-16
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is a state of charge of 50%, even if an overvoltage occurs, the possibility that the negative electrode will become the potential of metal lithium is low, but there is a problem that if the state of charge exceeds 80% and is close to a fully charged state, the rapid input, Then the potential of the negative electrode will be in a state close to the lithium potential for a short time due to overvoltage, and there is a danger that metal lithium will be separated out in a part of the carbon material.
However, water-based electrode binder materials are insufficient to replace PDVF in terms of input and output characteristics of secondary batteries.

Method used

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  • Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, negative electrode for nonaqueous-electrolyte secondary battery, nonaqueous-electrolyte secondary battery, and vehicle
  • Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, negative electrode for nonaqueous-electrolyte secondary battery, nonaqueous-electrolyte secondary battery, and vehicle
  • Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, negative electrode for nonaqueous-electrolyte secondary battery, nonaqueous-electrolyte secondary battery, and vehicle

Examples

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Embodiment

[0162] Hereinafter, although an Example demonstrates this invention concretely, these Examples do not limit the scope of this invention.

[0163] Hereinafter, although the physical property values ​​(ρ Bt , ρ He , specific surface area (SSA), average particle size (D v50 ), hydrogen / carbon atomic ratio (H / C), d 002 , L c(002) , charge capacity, discharge capacity, irreversible capacity, moisture absorption, input and output value of 50% state of charge, DC resistance value, capacity retention rate, AC resistance value, high temperature storage loss capacity), but, including embodiments, this The physical property values ​​described in the specification are based on the values ​​obtained by the following methods.

[0164] (true density obtained by the butanol method (ρ Bt ))

[0165] The true density was measured by the butanol method according to the method specified in JIS R7212. Accurately weigh the mass of a pycnometer with a side tube with an inner volume of about 40m...

manufacture example a-1

[0265] Put 70kg of petroleum 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 with an inner volume of 300 liters, heat, melt and mix at 190°C Thereafter, it was cooled to 80 to 90° C., and the inside of the pressure-resistant container was pressurized with nitrogen gas, and the contents were extruded through an outlet nozzle to obtain a rope-shaped molded body with a diameter of about 500 μm. Next, the rope-shaped molded body was pulverized so that the ratio (L / D) of the diameter (D) to the length (L) was about 1.5, and the obtained crushed product was put into a 0.53-mass melt heated to 93°C. % polyvinyl alcohol (saponification degree 88%) in the aqueous solution, stir and disperse, obtain spherical asphalt molded body slurry after cooling. After most of the water was removed by filtration, the naphthalene in the asphalt formed body was removed by extrac...

manufacture example a-2

[0269] Except that the oxidation temperature of the porous spherical pitch was changed to 240°C, and the particle size distribution was adjusted so that the pulverized particle size was changed to about 4 μm, a non-graphitizable carbon material a- 2.

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Abstract

The purpose of this invention is to provide, among other things, a carbonaceous material for a negative electrode of a nonaqueous-electrolyte secondary battery, said carbonaceous material having a high volumetric energy density and excellent cycle characteristics. This negative-electrode material for a nonaqueous-electrolyte secondary battery comprises, as an active material, a carbon-material mixture that contains a plurality of non-graphitic carbon materials. The true density (rouBt) of said carbon-material mixture, as determined using a butanol method, is between 1.60 and 2.05 g / cm<3>, inclusive; the atomic ratio of hydrogen to carbon (H / C) in the carbon-material mixture, as per elemental analysis, is no more than 0.10; and the discharge capacity of the carbon-material mixture at 0 to 0.1 V relative to a lithium reference electrode is between 80 and 230 mAh / g, inclusive.

Description

technical field [0001] The invention relates to a carbonaceous material for a negative electrode of a nonaqueous electrolyte secondary battery, a negative electrode for a nonaqueous electrolyte secondary battery, a nonaqueous electrolyte secondary battery and a vehicle. Background technique [0002] In recent years, it is expected that non-aqueous electrolyte secondary batteries (for example, lithium-ion secondary batteries) can be used in electric vehicles (EVs) driven only by motors, or in which internal combustion engines It is widely used in automotive applications such as plug-in hybrid electric vehicles (PHEV) and hybrid electric vehicles (HEV) combined with motors. In particular, for lithium-ion secondary batteries for EVs, it is necessary to increase the energy density for extending the cruising distance under one charge, and to further improve the fuel efficiency of vehicles, it is necessary to improve the batteries required for the improvement of energy regeneratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/36H01M10/0566
CPCC01P2006/10C01P2006/40C01P2006/80C01B32/05H01G11/24H01G11/38H01G11/42H01G11/50H01M4/364H01M4/587H01M4/622H01M10/0525H01M2004/021H01M2004/027Y02E60/10Y02T10/70H01M4/133H01M2220/20Y02E60/13
Inventor 小林正太池山泰史多田靖浩園部直弘小松真友
Owner KUREHA KAGAKU KOGYO KK
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