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A kind of negative electrode material for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of restricting the use surface of lithium-ion batteries and hindering the better development of lithium-ion batteries, and achieves suppression of irreversible side reactions and good structure. Effects of stability and long cycle life

Active Publication Date: 2016-08-10
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there is no anode material for lithium-ion batteries that can be discharged at ultra-low temperature, stable performance, and excellent cycle performance, which limits the use of lithium-ion batteries and hinders the better development of the lithium-ion battery industry.

Method used

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  • A kind of negative electrode material for lithium ion battery and preparation method thereof
  • A kind of negative electrode material for lithium ion battery and preparation method thereof
  • A kind of negative electrode material for lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0030] A negative electrode material for a lithium ion battery provided in this embodiment, the negative electrode material is a core-shell structure, including a shell layer and a core layer, the shell layer material is pyrolysis carbon, the core layer material is natural graphite, and the inside of the core layer material is filled There is coke; the internal pore diameter of the negative electrode material is 5-50nm, the average pore diameter is 17nm, and the pore volume is 0.066cm 3 / g, the powder compaction density of negative electrode material under 1000 kg pressure is 1.50g / cm 3 , The specific surface area is 2. 3m 2 / g; tap density is 1.1g / cm 3 and the intensity ratio (C004 / C110) of the X-ray diffraction peak intensity of the 004 crystal plane of the negative electrode material to the X-ray diffraction peak of the 110 crystal plane is 6.0 (the test method is: the negative electrode material provided by the present embodiment and superconducting carbon After mixing w...

Embodiment 2

[0032]A negative electrode material for a lithium ion battery provided in this embodiment, the negative electrode material is a core-shell structure, including a shell layer and a core layer, the shell layer material is pyrolysis carbon, the core layer material is natural graphite, and the inside of the core layer material is filled With coke; the internal pore diameter of the negative electrode material is 0.1-200nm, the average pore diameter is 5nm, and the pore volume is 0.06cm 3 / g, the powder compaction density of negative electrode material under 1000 kg pressure is 1.40g / cm 3 , the specific surface area is 2.0m 2 / g; tap density is 1.5g / cm 3 and the intensity ratio (C004 / C110) of the X-ray diffraction peak intensity of the 004 crystal plane of the negative electrode material to the X-ray diffraction peak of the 110 crystal plane is 3.0 (the test method is: the negative electrode material provided by the present embodiment and superconducting carbon After mixing with s...

Embodiment 3

[0034] A negative electrode material for a lithium ion battery provided in this embodiment, the negative electrode material is a core-shell structure, including a shell layer and a core layer, the shell layer material is pyrolysis carbon, the core layer material is natural graphite, and the inside of the core layer material is filled With coke; the internal pore diameter of the negative electrode material is 5-100nm, the average pore diameter is 20nm, and the pore volume is 0.08cm 3 / g, the powder compaction density of negative electrode material under 1000 kg pressure is 1.60g / cm 3 , with a specific surface area of ​​3m 2 / g; tap density is 0.9g / cm 3 and the intensity ratio (C004 / C110) of the X-ray diffraction peak intensity of the 004 crystal plane of the negative electrode material to the X-ray diffraction peak of the 110 crystal plane is 10.0 (the test method is: the negative electrode material provided by the present embodiment and superconducting carbon After mixing wi...

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Abstract

The invention belongs to the technical field of lithium ion battery, especially relates to a cathode material of the lithium ion battery. The cathode material has a core-shell structure, wherein the shell material is pyrolysis carbon, the core material is natural graphite, and inside of the core material is filled with coke. An average aperture of the cathode material is 5-20 nm, a pore volume is 0.06-0.08 g / cc, a powder compaction density under a pressure of 1000 kilograms is 1.4-1.6 g / cm<3>, and a ratio of an X-ray diffraction peak intensity of 004 crystal face and 110 crystal face (C004 / C110) is 3.0-10.0. Compared with prior art, the cathode material particles provided by the invention has compact internal structure, and can maintain good structure stability during a charge and discharge process; and surface and inside of the particles are provided with unobstructed lithium ion diffusion channels, thereby guaranteeing the lithium ion battery prepared by using the material with an ultra-high low-temperature discharge capability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-density and high-hardness lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] The increasing popularity of portable electronic devices, such as mobile phones, digital cameras, notebook computers, MP3 and MP4, has put forward higher requirements for the corresponding power supply. Lithium-ion batteries are widely used in portable electronic devices due to their advantages such as good safety performance, high energy density, light weight, long life and low self-discharge. However, the discharge performance of lithium-ion batteries at low temperatures is not satisfactory. This is because when the battery is charged and discharged at low temperature, affected by the slow migration speed of lithium ions, the electrical properties of the battery such as discharge capacity and cycle life are s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62
CPCY02E60/10
Inventor 崔航刘东任汪颖孙峰汪新刘现军王娜
Owner DONGGUAN AMPEREX TECH
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