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Rapidly-charged graphite lithium ion battery anode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of fast capacity decay and poor stability, and achieve the effects of improving charging rate, low cost and simple process

Inactive Publication Date: 2015-11-04
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem solved by the present invention is to provide a fast-charging graphite lithium-ion battery negative electrode material and its preparation method in order to overcome the defects of poor stability in the rapid charge and discharge process and fast capacity decay of the existing asphalt-modified graphite negative electrode material

Method used

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  • Rapidly-charged graphite lithium ion battery anode material and preparation method thereof
  • Rapidly-charged graphite lithium ion battery anode material and preparation method thereof
  • Rapidly-charged graphite lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 16kg of natural graphite (D50 is 6.0μm), 4kg of petroleum pitch (D50 is 4.0μm) and 0.8kg of graphitization catalyst (SiC) are alternately added to the cantilever double-helix conical mixer and mixed for 2 hours, then added to the kneading pot under stirring Mix and heat to 160° C. for 3 hours of kneading treatment. After the kneading is completed, press into a tablet shape in a tablet machine and pulverize with a hammer mill. Under the protection of nitrogen, heat treatment and granulation were carried out at 500°C for 12 hours, and then the reaction product was cooled to room temperature, and then catalytic graphitization was carried out at 2400°C for 48 hours to obtain fast-charging graphite lithium ion Battery negative electrode material. Its button battery has a capacity of 364.9mAh / g, an initial efficiency of 91.8%, and a charge rate (1.5C) of 82.8%.

Embodiment 2

[0049]Add 16kg of natural graphite (D50 is 6.0μm), 4kg of coal tar pitch (D50 is 6.4μm) and 0.8kg of graphitization catalyst (SiC) into the cantilever double-helix conical mixer and mix for 2 hours, then add it to the kneading pot under stirring Mix and heat to 160° C. for 5 hours of kneading treatment. After the kneading is completed, press into a tablet shape in a tablet machine and pulverize with a hammer mill. Under the protection of nitrogen, heat treatment and granulation were carried out at 500°C for 18 hours, and then the reaction product was cooled to room temperature, and then catalytic graphitization was carried out at 2400°C for 48 hours to obtain fast-charging graphite lithium ion Battery negative electrode material. Its button battery has a capacity of 363.7mAh / g, an initial efficiency of 90.8%, and a charge rate (1.5C) of 84.0%.

Embodiment 3

[0051] 10kg of natural graphite (D50 is 5.0μm), 10kg of petroleum pitch (D50 of 4.0μm) and 0.5kg of graphitization catalyst (SiC) are alternately added to the cantilever double-helix conical mixer and mixed for 2 hours, then added to the kneading pot under stirring Mix and heat to 100° C. for 10 hours of kneading treatment. After the kneading is completed, press into a tablet shape in a tablet press and pulverize with a hammer mill. Under the protection of nitrogen, heat treatment and granulation were carried out at 700°C for 18 hours, and then the reaction product was cooled to room temperature, and then catalytic graphitization was carried out at 2500°C for 20 hours to obtain fast-charging graphite lithium ion Battery negative electrode material. Its button battery has a capacity of 360.2mAh / g, an initial efficiency of 91.3%, and a charge rate (1.5C) of 82.1%.

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Abstract

The invention discloses a rapidly-charged graphite lithium ion battery anode material and a preparation method thereof. The preparation method for the rapidly-charged graphite lithium ion battery anode material comprises the following steps of: (1) mixing a mixture containing natural graphite and asphalt, and heating, kneading and smashing the mixture, wherein the average grain size D50 of the natural graphite is 5 to 10 micrometers, and the mass rate of the natural graphite to the asphalt is (50:50) to (90:10); (2) carrying out heat treatment at 300-700 DEG C under the protection of an inert gas; and (3) performing graphitizing. The average grain size D50 of the rapidly-charged graphite lithium ion battery anode material prepared according to the method is ranging from 5 micrometers to 15 micrometers, the specific surface area is less than 2.0 m<2> / g, the initial discharging capacity of the battery prepared from the rapidly-charged graphite lithium ion battery anode material is over 360 mAh / g, the initial charging and discharging efficiency is over 90 percent, the charging rate (1.5C) is over 80 percent, and a product is high in discharging capacity and charging and discharging efficiency and good in rate capability. The invention also relates to a battery, and the battery comprises the rapidly-charged graphite lithium ion battery anode material.

Description

technical field [0001] The invention relates to the field of graphite negative electrode materials, in particular to a fast-charging graphite lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Compared with the original batteries, lithium-ion batteries have been rapidly popularized in mobile phones, notebook computers and power tools due to their high energy density, long cycle life, and no memory effect. With the increasing requirements of various products for small, lightweight, multi-functional, and short-time charging, the requirements for fast charging performance of lithium-ion batteries are also increasing. At present, the improvement of fast charging performance of lithium-ion batteries mainly depends on the quality of negative electrode materials. develop and improve. Therefore, improving the low-temperature fast charging characteristics of lithium-ion battery anode materials is a hot spot in future res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/10
Inventor 谢秋生杜辉玉张鹏昌仲林陈志明
Owner SHANGHAI SHANSHAN TECH CO LTD
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