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High-density graphite battery negative electrode material and preparation method thereof

A battery negative electrode, high-density technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of graphite negative electrode material structure instability, low primary charge capacity, high irreversible capacity, etc., to improve charge and discharge stability, production The effect of high efficiency and improved doping uniformity

Active Publication Date: 2017-01-04
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a high-density graphite battery negative electrode material with high yield, simple process, high discharge capacity and high discharge stability and a preparation method thereof, so as to solve the problem of unstable structure of graphite negative electrode materials in the prior art, primary Technical problems such as low charging capacity, high irreversible capacity, and limited electrical performance

Method used

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Embodiment 1

[0023] In the embodiment of the present invention, a method for preparing a high-density graphite battery negative electrode material, the specific steps are as follows:

[0024] (1) Preparation of modified quartz sand: In a circulating airtight container, under the condition of hydrofluoric acid vapor as an etchant, the surface etching of micro-nano quartz sand with an average particle size of 0.5 μm and a porosity of 30% mole For modification, control the amount of hydrofluoric acid vapor on the quartz sand to 0.5 mol / (min·100g), etch for 3 hours, and then vacuum-dry the quartz sand at 60°C for 45 minutes to prepare modified quartz sand.

[0025] (2) Modified quartz sand loaded with graphite carbon material: the graphite carbon material is used as the mobile phase, the modified quartz sand is used as the stationary phase, and the packing density of the modified quartz sand is controlled to be 1.3kg / m in the fixed reactor 3 , the reaction temperature is 120°C, the flow rate o...

Embodiment 2

[0029] In the embodiment of the present invention, a method for preparing a high-density graphite battery negative electrode material, the specific steps are as follows:

[0030] (1) Preparation of modified quartz sand: in a circulating airtight container, under the condition of hydrofluoric acid vapor as an etchant, the surface etching of micro-nano quartz sand with an average particle size of 1.50 μm and a porosity of 45% mole For modification, control the amount of hydrofluoric acid vapor on the quartz sand to 15 mol / (min·100g), etch for 3 hours, and then vacuum-dry the quartz sand at 60°C for 45 minutes to prepare modified quartz sand.

[0031] (2) Modified quartz sand loaded with graphite carbon material: the graphite carbon material is used as the mobile phase, the modified quartz sand is used as the stationary phase, and the packing density of the modified quartz sand is controlled to be 1.8kg / m in the fixed reactor 3 , the reaction temperature is 150°C, the flow rate o...

Embodiment 3

[0035] In the embodiment of the present invention, a method for preparing a high-density graphite battery negative electrode material, the specific steps are as follows:

[0036] (1) Preparation of modified quartz sand: in a circulating airtight container, under the condition of hydrofluoric acid vapor as an etchant, the surface etching of micro-nano quartz sand with an average particle size of 1.0 μm and a porosity of 35% mole For modification, control the amount of hydrofluoric acid vapor on the quartz sand to 10mol / (min·100g), and the etching time is 4h, and then vacuum-dry the quartz sand at 60°C for 45min to prepare modified quartz sand.

[0037] (2) Modified quartz sand loaded with graphite carbon material: the graphite carbon material is used as the mobile phase, the modified quartz sand is used as the stationary phase, and the packing density of the modified quartz sand is controlled to be 1.5kg / m in the fixed reactor 3 , the reaction temperature is 150°C, the flow rat...

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Abstract

The present invention discloses a high-density graphite battery negative electrode material and a preparation method thereof. The graphite battery negative electrode material comprises the following raw materials: graphite carbon material supported modified quartz sand and a graphite carbon material, wherein a mass ratio of the graphite carbon material supported modified quartz sand to the graphite carbon material is 1:20-25. The preparation steps comprise: preparing modified quartz sand and graphite carbon material supported modified quartz sand, and adopting the graphite carbon material supported modified quartz sand and a graphite carbon material as raw materials to prepare the graphite battery negative electrode material. According to the present invention, the first discharge capacity is not less than 450 mAh / g (the irreversible capacity is less than 15 mAh / g), the first charge and discharge efficiency is more than 97.0%, and more than 90% of the first capacity is still retained after cycle 500 times; and the graphite battery negative electrode material has advantages of high capacitance, low irreversible capacity, stable cycle performance, high yield and simple process, and has broad application prospects in the applications in lithium-ion batteries and other negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of graphite batteries, in particular to a high-density graphite battery negative electrode material and a preparation method thereof. Background technique [0002] With its advantages of high specific energy, high working voltage, fast charging and discharging, long cycle life, safety and pollution-free, lithium-ion batteries have successfully replaced other secondary batteries and become the standard for small electronic products such as mobile phones, notebook computers and video recorders. The main energy source, and greatly promoted the industrialization process of electric vehicles, many countries have also fully started the development of lithium-ion batteries in the military and aerospace fields, which put forward higher requirements for lithium-ion batteries. Electrode materials are the key to improving the performance of lithium-ion batteries and directly affect the charge-discharge performance of b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/48
CPCH01M4/362H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 顾凯杜辉玉丁晓阳池淑芬李虹王旭峰叶韵
Owner SHANGHAI SHANSHAN TECH CO LTD
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