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Composite graphite negative electrode material for lithium ion batteries and preparation method thereof

A lithium-ion battery, composite graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low cycle performance and one-time charge capacity, high electrolyte requirements, and poor liquid absorption on the surface of natural graphite, achieving excellent Charge rate performance and cycle performance, simple processing and preparation method, high discharge platform and high platform retention rate

Inactive Publication Date: 2017-11-03
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a lithium-ion battery composite graphite negative electrode material with simple process, high discharge capacity, high discharge stability and high density and its preparation method, which overcomes the cycle performance and primary charge capacity of artificial graphite materials in the prior art. Low, poor liquid absorption on the surface of natural graphite, and high requirements for electrolyte

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  • Composite graphite negative electrode material for lithium ion batteries and preparation method thereof
  • Composite graphite negative electrode material for lithium ion batteries and preparation method thereof

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Embodiment 1

[0023] A lithium-ion battery composite graphite negative electrode material, consisting of the following raw materials in parts by mass: 100 parts of artificial graphite raw materials, 55 parts of natural graphite raw materials, and 5 parts of binder; the artificial graphite raw materials are calcined petroleum coke, with an average particle diameter of D50 The natural graphite raw material is 7-10 μm; the natural graphite raw material is a graphite material with a relatively regular shape after shaping treatment, and the average particle diameter D50 is 6-9 μm; the binder is high-temperature modified pitch.

[0024] The preparation method of described lithium-ion battery composite graphite negative electrode material comprises the following steps:

[0025] (1) Mix the artificial graphite raw material with the natural graphite raw material and the binder in a mass ratio of 100:55:5 to make it evenly mixed, and the mixing time is 45-60 minutes;

[0026] (2) In an inert gas, put...

Embodiment 2

[0032] A lithium-ion battery composite graphite negative electrode material, consisting of the following raw materials in parts by mass: 100 parts of artificial graphite raw materials, 60 parts of natural graphite raw materials, and 5 parts of binder; the artificial graphite raw materials are calcined petroleum coke, with an average particle diameter of D50 The natural graphite raw material is 7-10 μm; the natural graphite raw material is a graphite material with a relatively regular shape after shaping treatment, and the average particle diameter D50 is 6-9 μm; the binder is high-temperature modified pitch.

[0033] The preparation method of described lithium-ion battery composite graphite negative electrode material comprises the following steps:

[0034] (1) Mix the artificial graphite raw material with the natural graphite raw material and the binder in a mass ratio of 100:60:5 to make it evenly mixed, and the mixing time is 45-60 minutes;

[0035] (2) In an inert gas, put...

Embodiment 3

[0040]A lithium-ion battery composite graphite negative electrode material, consisting of the following raw materials in parts by mass: 100 parts of artificial graphite raw materials, 65 parts of natural graphite raw materials, and 5 parts of binder; the artificial graphite raw materials are calcined petroleum coke, with an average particle diameter of D50 The natural graphite raw material is 7-10 μm; the natural graphite raw material is a graphite material with a relatively regular shape after shaping treatment, and the average particle diameter D50 is 6-9 μm; the binder is high-temperature modified pitch.

[0041] The preparation method of described lithium-ion battery composite graphite negative electrode material comprises the following steps:

[0042] (1) Mix the artificial graphite raw material with the natural graphite raw material and the binder according to the mass ratio of 100:65:5 to make it evenly mixed, and the mixing time is 45-60 minutes;

[0043] (2) In an ine...

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Abstract

The invention discloses a composite graphite negative electrode material for lithium ion batteries and a preparation method thereof. The preparation method comprises the following steps: mixing a synthetic graphite raw material, a natural graphite raw material and an adhesive in a mass proportion of 100: (55 to 65): (3 to 7); under inert gas shielding, putting the mixed materials into a low-temperature surface modification reaction kettle, warming and stirring to obtain a cladding body; carrying out carbonizing treatment on the cladding body; enabling the cladding body through carbonizing treatment to enter into a fusing machine for normal temperature modification to prepare a fusing body, and carrying out graphitization treatment on the fusing body in inert gas to prepare the negative electrode material for lithium ion batteries. According to the graphite negative electrode material for lithium ion batteries disclosed by the invention, the specific capacity is not smaller than 355 mAh / g, and the first charging and discharging efficiency is more than 91.0%; and the graphite negative electrode material has relatively high gram volume, is extremely high in rate capacity and cycle performance and stable in performance, and can be widely applied to negative electrode materials of the lithium ion batteries.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery composite graphite 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; lithium-ion batteries have greatly promoted the industrialization process of electric vehicles, and many countries have also fully launched the development of lithium-ion batteries in the military and aerospace fields, which puts forward higher requirements for lithium-ion batteries ; With the development of science and technology, electronic products and new energy vehicles pay more attention ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 顾凯杜辉玉丁晓阳李惊蛰李虹王旭峰李季
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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