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Lithium ion battery anode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited improvement in cycle stability of negative electrode materials and reduced modification effect, so as to improve reversible capacity and coulombic efficiency, increase The effect of lithium storage capacity and low production cost

Active Publication Date: 2011-08-31
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the existing modified materials coated graphite represented by these two pitches is that the gram capacity of the coated product does not change or is greatly reduced after heat treatment, and the cycle stability of the negative electrode material is limited, which greatly reduces the modification effect.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0014] The lithium ion battery graphite negative electrode material of the present invention includes graphite and a carbon material coating layer (ie shell layer) with a porous structure located outside the graphite, and the thickness of the coating layer is about tens to hundreds of nanometers. Its preparation method includes the following steps: (1) uniformly mixing graphite particles with a particle size ranging from 5 to 50 μm and pitch monomer; (2) adopting the Friedel-Crafts crosslinking method, and the crosslinking bridge (mainly carbonyl) introduced by the reaction will The asphalt monomers are connected to form a gel network on the graphite surface to form a new type of pitch-based porous carbon material coating; (3) heat-treat the graphite coated with porous structure pitch in the temperature range of 800 to 1500 ° C for 1 to For 12 hours, inert gas is filled at the same time to form a composite graphite material with a porous carbon material coating layer; after hea...

Embodiment 1

[0016] Example 1: In a 5L container, add 0.1kg of oxidized bitumen and 1L of CS 2 , then add 1kg of spherical natural graphite, the particle size of spherical natural graphite is D50=18.2μm, the specific surface area is 4.1㎡ / g, and the tap density is 0.95g / c.c. Stir rapidly at a speed of 100rpm to make the asphalt and graphite evenly mixed. After stirring for 30min, the temperature was raised to 90°C, and 0.003kg of AlCl was added 3 and 0.012kg of CCl 4 , Cross-linking reaction 1h. The asphalt-coated spherical natural graphite obtained after the cross-linking reaction is heated up to 1100°C in an inert atmosphere of nitrogen, kept at a constant temperature for 2 hours, then cooled to below 100°C, taken out, crushed, and sieved to be used as a lithium-ion battery Negative material.

Embodiment 2

[0017] Example 2: In a 5L container, add 0.1kg of oxidized pitch, and then add 1kg of spherical natural graphite. The particle size of spherical natural graphite is D50=30μm, the specific surface area is 3.5㎡ / g, and the tap density is 0.95g / c.c. 120rpm rapid stirring to make pitch and graphite mixed evenly. After stirring for 30min, the temperature was raised to 135°C, and 0.003kg of AlCl was added under continuous stirring 3 and 0.012kg of CCl 4 , Cross-linking reaction 1h. The asphalt-coated spherical natural graphite obtained after the cross-linking reaction is heated up to 1100°C in an inert atmosphere of nitrogen, kept at a constant temperature for 2 hours, then cooled to below 100°C, taken out, crushed, and sieved to be used as a lithium-ion battery Negative material.

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Abstract

The invention discloses a lithium ion battery anode material which comprises graphite and a shell layer arranged outside the graphite, wherein the shell layer is an asphalt-based carbon material cladding layer with a porous structure. A preparation method of the lithium ion battery anode material comprises the steps of: 1, in the terms of the weight, uniformly mixing 100 parts of graphite particles with particle diameter of 5-50mum with 1-25 parts of asphalt monomers; 2, carrying out Friedel-Crafts cross-linking reaction; and 3, in an inert gas, thermally treating at 800-1500 DEG C for 1-12h,then cooling to be below 100 DEG C, taking out, crushing and sieving to prepare a composite asphalt material with the porous structure carbon material cladding layer. Due to the adoption of the invention, gram volume of the graphite material is greatly increased, reversible volume and coulomb efficiency are increased, and circulating stability of the anode material is greatly enhanced. Meanwhile,production cost is low.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] At present, the anode materials widely used in lithium-ion batteries are mainly carbon anode materials. The electrical properties of carbon anode materials are determined by various factors such as its internal structure, particle morphology, and surface properties. Studies have shown that there are many deficiencies in carbon materials as negative electrode materials for lithium-ion batteries, and their deficiencies have a lot to do with the large number of defects on the surface. have an important impact. Therefore, surface treatment of carbon anode materials has become an effective method to improve their performance. Common surface treatment methods for carbon anode materials include coating method, doping method, redox m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/133H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 赵东辉周鹏伟戴涛
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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