Method for preparing negative electrode material of lithium ion secondary battery

A technology for secondary batteries and negative electrode materials, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of many controlled parameters, difficult cost control, complicated preparation process, etc., and achieve stable storage, low cost, and abundant sources. Effect

Inactive Publication Date: 2014-03-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

SiO 2 is one of them, when SiO 2 When the particles are very small or amorphous, they have higher capacity and better cycle performance, but SiO with nanoparticle size or amorphous 2 The preparation process of particles is generally more complicated, such as preparation by hydrolysis of tetraethyl orthosilicate, in which there are many parameters that need to be controlled; at the same time, the conductivity of this material is poor, and materials such as carbon are usually added during the preparation process. overlay to improve its performance, so the process is more complicated and the cost is difficult to control

Method used

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  • Method for preparing negative electrode material of lithium ion secondary battery
  • Method for preparing negative electrode material of lithium ion secondary battery
  • Method for preparing negative electrode material of lithium ion secondary battery

Examples

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Embodiment 1

[0024] The cleaned rice husks were carbonized at 450°C for 1 hour under nitrogen atmosphere, and the temperature was naturally lowered to obtain carbonized rice husks. 2 The mixed atmosphere was kept at 900°C for 5 hours, and the temperature was naturally lowered to obtain the electrode material.

[0025] Synthetic SiO 2 The XRD pattern of / C negative electrode material, such as figure 2 shown.

[0026] The active material (prepared electrode material), conductive agent (super P), and binder (PVDF) are mixed according to the mass ratio of 6:3:1, coated on the copper foil, and lithium is used as the counter electrode to make a battery, and the electrolyte Selected as commonly used lithium-ion battery electrolyte: lithium hexafluorophosphate (LiPF 6 ) / ethylene carbonate (EC): dimethyl carbonate (DMC): methyl carbonate (EMC) mixture = 1:1:8.

[0027] The prepared battery charge-discharge curve and cycle performance curve are as follows: image 3 and 4 As shown, the charge ...

Embodiment 2

[0029] The difference between Example 2 and Example 1 is that it is only carbonized at 450° C. for 1 hour without subsequent high-temperature treatment. The battery material obtained is made battery according to the method of embodiment 1, and cycle performance curve is as follows Figure 5 As shown, the charge and discharge capacity after 30 cycles is 409.9mAhg -1 / 401.1mAhg -1 .

[0030] Synthetic SiO 2 The XRD pattern of / C negative electrode material, such as figure 2 shown.

[0031] If the carbonization temperature is higher than 450°C and the carbonization time is longer than 1h, electrode materials can also be obtained. The cycle performance of the fabricated battery is basically the same as that of the electrode material obtained by carbonizing at 450°C for 1 hour.

Embodiment 3

[0033] The difference between Example 3 and Example 1 is that the high temperature treatment temperature is different, and the carbonized rice husk is kept at 800° C. for 5 hours, and the rest are the same. The battery material that makes is made battery by the method of embodiment 1, and battery cycle performance curve is as follows Figure 6 As shown, the charge and discharge capacity after 30 cycles is 443.3mAhg -1 / 451.9mAhg -1 .

[0034] Synthetic SiO 2 The XRD pattern of / C negative electrode material, such as figure 2 shown.

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Abstract

The invention discloses a method for preparing a negative electrode material of a lithium ion secondary battery, which belongs to the technical field of lithium ion batteries. With rice hulls as raw materials, a negative electrode material of an SiO2/C lithium ion secondary battery is prepared by two steps of carbonization and high temperature treatment, wherein the carbonization step is carried out as follows: carbonizing in a nitrogen atmosphere at a temperature of 200-700 DEG C for 0.5-2 hours, and naturally cooling to obtain carbonized rice hulls; the high temperature treatment step is carried out as follows: grinding the carbonized rice hulls into powder, maintaining the temperature in a hydrogen or/and argon atmosphere at 700-1000 DEG C for 3-5 hours to obtain an electrode material; or only the carbonization step is carried out to prepare the electrode material. According to the method disclosed by the invention, raw material sources are wide, waste utilization cost is low, the preparation process is simple and easy, the energy consumption is low, and the environmental-friendly effect is achieved; the prepared negative electrode material has the characteristics of low voltage platform, high capacity, stable circulation performance and long service life.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a lithium ion secondary battery negative electrode material. Background technique [0002] Batteries, as energy storage devices, are widely used in modern society. Among them, lithium-ion secondary batteries are favored by people because of their high working voltage, energy density, good service life and safety. [0003] At present, due to the emergence and popularization of various new electronic products, as well as the development of electric vehicles, the demand for lithium-ion secondary batteries with high energy density has increased, and the key to increasing battery capacity lies in the selection of positive and negative electrode materials with better performance. [0004] At present, the anode material used in large-scale commercial use is graphite, but its theoretical specific capacity is only 372mAhg -1 ,relatively low. In order to impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/122H01M4/362H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 魏英进高宇巨彦铭陈岗
Owner JILIN UNIV
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