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Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, and process for producing same

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problem that carbon materials do not have capacity, etc., and achieve the effect of high discharge capacity and excellent charge and discharge efficiency

Active Publication Date: 2018-05-11
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon materials reported so far do not possess sufficient capacity

Method used

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  • Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, and process for producing same
  • Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, and process for producing same
  • Carbonaceous material for negative electrode of nonaqueous-electrolyte secondary battery, and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0186]In a nitrogen atmosphere, add sodium hydroxide (NaOH) aqueous solution to the coconut shell charcoal with a particle size of 200 μm (dry distillation at 500 ° C) to impregnate it, and then perform decompression heating and dehydration treatment, thus obtaining a carbon fiber relative to coconut shell carbon. The carbon was impregnated with a carbonaceous precursor of 7.0 wt% NaOH. Next, 10 g of the carbonaceous precursor impregnated with NaOH was heat-treated at 800° C. in a nitrogen atmosphere, and then the nitrogen gas flowing in the reaction tube was replaced with a mixed gas of chlorine and nitrogen, and kept at 860° C. for 1 hour. Next, the flow of chlorine gas was stopped, and the mixture was kept under a nitrogen atmosphere for 30 minutes to obtain charcoal fired from coconut shells. 200 g of the obtained coconut shell pulverized charcoal was pulverized for 20 minutes with a jet mill (AIR JET MILL; MODEL100AFG of Hosokawa Micron Co., Ltd.) to obtain a pulverized c...

Embodiment 2

[0187] Carbonaceous material 2 was obtained in the same manner as in Example 1 except that the impregnation amount of NaOH was changed to 15%.

Embodiment 3

[0189] Carbonaceous material 3 was obtained in the same manner as in Example 1 except that the impregnation amount of NaOH was changed to 18%.

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Abstract

The purpose of the present invention is to provide a nonaqueous-electrolyte secondary battery which has high discharge capacity and high charge / discharge efficiency. The problem can be solved with a carbonaceous material of the present invention for the negative electrodes of nonaqueous-electrolyte secondary batteries. The carbonaceous material is characterized in that a plant is adopted as a carbon source, the potassium element content is 0.10 wt% or less and a true density determined by the butanol method is 1.35-1.50 g / cm3, and when the carbonaceous material is electrochemically doped withlithium and examined for lithium-nucleus NMR spectrum, then the spectrum has a main resonance peak shifted by 110-160 ppm to the lower-magnetic-field side of the resonance peak assigned to LiCl serving as a reference.

Description

technical field [0001] The invention relates to a carbonaceous material for a non-aqueous electrolyte secondary battery. According to the present invention, there can be provided a negative electrode carbonaceous material for a nonaqueous electrolyte secondary battery that has a high discharge capacity and exhibits excellent charge and discharge efficiency. Background technique [0002] In recent years, due to increased interest in environmental issues, electric vehicles are being equipped with large secondary batteries with high energy density and excellent output characteristics. In particular, in order to extend the cruising distance on a single charge in EV applications, further increase in energy density is expected. At present, the theoretical capacity of the graphite material mainly used to store lithium is 372Ah / kg, and there is a limit in theory. In addition, alloy-based negative electrode materials such as tin and silicon have also been proposed as materials with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/133
CPCC01B32/00H01M4/133H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10C01B32/05C01P2006/40H01M4/1393H01M4/583H01M4/623H01M4/661H01M10/052H01M10/0569H01M2004/028Y02T10/70
Inventor 今治诚矢口逹也小林正太多田靖浩
Owner KURARAY CO LTD
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