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Graphite material for negative electrode of lithium secondary battery, manufacturing method thereof, and lithium secondary battery using same

A graphite material and secondary battery technology, applied in secondary batteries, battery electrodes, graphite, etc., can solve problems such as capacity deterioration and increase in reduction and decomposition of electrolyte, achieve high reliability, inhibit capacity deterioration, and excellent storage characteristics Effect

Inactive Publication Date: 2015-09-16
JX NIPPON OIL & ENERGY CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In short, even if the decomposition of the electrolyte solution due to solvent co-intercalation can be suppressed by introducing a low-crystallinity region into the particle surface, the following problem remains: the crystallites in the introduced low-crystallinity region are in an isotropic state , so the edge is exposed on the surface, resulting in increased reduction and decomposition of the electrolyte, resulting in capacity degradation

Method used

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  • Graphite material for negative electrode of lithium secondary battery, manufacturing method thereof, and lithium secondary battery using same
  • Graphite material for negative electrode of lithium secondary battery, manufacturing method thereof, and lithium secondary battery using same
  • Graphite material for negative electrode of lithium secondary battery, manufacturing method thereof, and lithium secondary battery using same

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Embodiment

[0419] Hereinafter, based on examples and comparative examples, the first to third embodiments of the present invention will be described more specifically, but the present invention is not limited to the following examples.

[0420] 1. Raw material carbon composition and production method thereof

[0421] (1) Raw carbon composition A-1

[0422] Hydrodesulfurize the atmospheric distillation residue with a sulfur content of 3.1% by mass in the presence of a catalyst until the hydrocracking rate reaches 25% or less to obtain hydrodesulfurized oil. The hydrodesulfurization conditions are total pressure 180MPa, hydrogen partial pressure 160MPa, temperature 380°C. In addition, desulfurized vacuum light oil (with a sulfur content of 500 mass ppm and a density of 0.88 g / cm at 15°C 3 ) fluid catalytic cracking to obtain fluid catalytic cracking residue. The fluidized catalytic cracking residual oil is selectively extracted with dimethylformamide to be separated into aromatic compon...

Embodiment 1

[0648] In Examples 16 to 31 and Comparative Examples 19 to 46, the powders of raw carbon compositions A-3 to U-3 were mixed with calcined coke, and compressive shear stress was applied to obtain composite powders. Carry out carbonization and graphitization under the same conditions to obtain graphite material. Table 3 shows the average particle size of the calcined coke, the blending amount, and the conditions for applying compressive shear stress. Here, for Examples 16 to 28 and Comparative Examples 19 to 46, "NOBILTA Model 130" manufactured by HOSOKAWA MICRON CORPORATION was used as a device for applying compressive shear stress, and NIPPON COKE & ENGINEERING CO., LTD. was used in Examples 29 and 30. "COMPOSI CP-15" manufactured by HOSOKAWA MICRON CORPORATION and "Mechano Fusion AMS-Lab" manufactured by HOSOKAWA MICRON CORPORATION were used in Example 31. In addition, in Table 3, "NOBILTA130 type" is abbreviated as "N", "COMPOSI CP-15" is abbreviated as "C", and "Mechano Fu...

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Abstract

A graphite material for a negative electrode is provided which can suppress capacity degradation due to repeated charging and discharging cycles, storage in a charged state, and floating charging. A method of manufacturing a graphite material for a negative electrode of a lithium ion secondary battery is provided in which an atomic ratio H / C of hydrogen atoms H and carbon atoms C in the raw coke composition is in a range of 0.30 to 0.50 and a microstrength of the raw coke composition is in a range of 7 wt% to 17 wt%.

Description

technical field [0001] The invention relates to a graphite material used as a negative electrode of a lithium secondary battery and a manufacturing method thereof. Specifically, it relates to a method for producing a graphite material used in a negative electrode of a lithium ion secondary battery having high durability while suppressing capacity degradation, and a lithium ion secondary battery including a negative electrode using the graphite material. Background technique [0002] Lithium-ion secondary batteries are lighter in weight and have higher input and output characteristics than conventional secondary batteries such as nickel-cadmium batteries, nickel-metal hydride batteries, and lead batteries. Therefore, in recent years, they have been prepared as power sources for electric vehicles and hybrid vehicles. expected. Generally, such a battery is constructed by opposing a lithium-containing positive electrode capable of reversibly intercalating lithium and a negative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587C01B31/04
CPCY02E60/122H01M4/587H01M10/0583H01M10/0525C01B31/04C01B32/20C01B32/205Y02E60/10Y02P70/50
Inventor 铃木贵志石丸纪代大山隆田野保小田敏幸藤永逸平浦井智明冈崎精二蔵田克彰平本敏章佐藤亚季乃小田亘
Owner JX NIPPON OIL & ENERGY CORP
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