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Negative electrode material for quickly rechargeable graphite lithium-ion battery and preparation method of negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of fast capacity decay and poor stability, and achieve the effects of simple process, low cost, and high yield

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

[0004] 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 graphite negative electrode materials

Method used

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  • Negative electrode material for quickly rechargeable graphite lithium-ion battery and preparation method of negative electrode material
  • Negative electrode material for quickly rechargeable graphite lithium-ion battery and preparation method of negative electrode material
  • Negative electrode material for quickly rechargeable graphite lithium-ion battery and preparation method of negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Put 16kg of petroleum coke (D50 is 6.0μm), 4kg of petroleum pitch (D50 is 4.0μm) 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 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 358.9mAh / g, an initial efficiency of 91.8%, and a charge rate (1.5C) of 82.8%.

Embodiment 2

[0043] Put 16kg of petroleum coke (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 356.7mAh / g, an initial efficiency of 90.8%, and a charge rate (1.5C) of 84.0%.

Embodiment 3

[0045] Add pitch coke (D50 is 5.0μm) 10kg, petroleum pitch (D50 is 4.0μm) 10kg and graphitization catalyst (SiC) 0.5kg alternately into the cantilever double-helix conical mixer and mix for 2 hours, then add 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 357.2mAh / 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 negative electrode material for a quickly rechargeable graphite lithium-ion battery and a preparation method of the negative electrode material. The preparation method of the negative electrode material for the quickly rechargeable graphite lithium-ion battery comprises the following steps: (1) mixing a mixture containing a graphite precursor and bitumen and heating the mixture for kneading and crushing, wherein the mean grain size D50 of the graphite precursor ranges from 5 to 10 microns, and the mass ratio of the graphite precursor to the bitumen ranges from 50:50 to 90:10; (2) performing heat treatment at a temperature within the range of 300-700 DEG C under the protection of an inert gas; and (3) carrying out graphitizing. The mean grain size D50 of the negative electrode material prepared by use of the preparation method for the quickly rechargeable graphite lithium-ion battery is within the range of 5-15 microns and the specific surface area of the negative electrode material is below 2.0m2 / g; the first discharge capacity of a negative electrode, manufactured by use of the negative electrode material for the quickly rechargeable graphite lithium-ion battery, is more than 355mAh / g, and the initial charge-discharge efficiency of the battery is above 90%; if the battery is quickly charged (1.5C) for 45 minutes, the capacity of the battery can be above 80%; in short, the product is high in discharge capacity and charge / discharge efficiency, and good in rate capability. The invention also relates to a battery comprising the negative electrode material for the quickly rechargeable graphite lithium-ion battery.

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 negative electrode material. develop and improve. Therefore, improving the low-temperature fast charging characteristics of lithium-ion battery anode materials is a hot spot in future research and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
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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