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Preparation method of lithium ion battery positive electrode material

A lithium-ion battery and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity and poor cyclability of vanadium dioxide, and achieve the effects of high repeatability, large specific capacity and simple process.

Active Publication Date: 2014-08-27
YADEA TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of poor conductivity of vanadium dioxide in the prior art and poor cycle performance when storing lithium, and provide a high capacity, high Preparation method of lithium-ion battery cathode material with rate performance and excellent cycle performance

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  • Preparation method of lithium ion battery positive electrode material
  • Preparation method of lithium ion battery positive electrode material
  • Preparation method of lithium ion battery positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A preparation method of lithium ion battery cathode material (vanadium dioxide-graphene composite), which comprises the steps of:

[0038] (1) Mix 1800mg of vanadium pentoxide and 400mg of graphene oxide (the mass ratio of the two is 4.5:1), disperse them into 200mL of water, then seal them in a hydrothermal kettle, and react at 180±5°C for 12 hours about;

[0039] (2) Add 2-10mL (35wt%) hydrazine hydrate to the system after step (1), and carry out the reduction reaction at 80±2°C for about 5 hours;

[0040] (3), -40 o C under freeze-drying to obtain a solid product, which is a vanadium dioxide-graphene composite.

[0041] Characterize the morphology of the obtained vanadium dioxide-graphene composite, the results can be found in figure 1 . The vanadium dioxide-graphene composite is composed of vanadium dioxide-graphene composite strips with an average length between 1 and 100 μm, a width between 20 and 500 nm, and a thickness between 1 and 50 nm, with a specific...

Embodiment 2

[0045] This example provides a kind of preparation method of lithium-ion battery cathode material (vanadium dioxide-graphene composite), which is basically the same as Example 1, the difference is that the mass ratio of raw material vanadium oxide to graphene oxide is 3:1. The vanadium dioxide-graphene composite is made into a working electrode according to the method provided by the present invention and the corresponding electrochemical performance test is carried out. The results are as follows: the first Coulombic efficiency is more than 90%, and when charging and discharging at 1C, the stable specific capacity is 390 mAh / g; when charging and discharging at 20C, the stable specific capacity is 295 mAh / g; when charging and discharging at 200C, the stable specific capacity is 204 mAh / g; when charging and discharging at the above rate, the capacity after 1400 repeated charging and discharging Both can maintain more than 90% of the initial capacity.

Embodiment 3

[0047] This example provides a preparation method of a lithium-ion battery positive electrode material (vanadium dioxide-graphene composite), which is basically the same as in Example 1, except that the mass ratio of the raw material vanadium oxide to graphene oxide is 2:1 .

[0048] The vanadium dioxide-graphene composite is made into a working electrode according to the method provided by the present invention and the corresponding electrical performance test is carried out. The results are as follows: the first Coulombic efficiency is 92%, and the stable specific capacity is 370 mAh when charging and discharging at 1C / g; when charging and discharging at 20C, the stable specific capacity is 284 mAh / g; when charging and discharging at 200C, the stable specific capacity is 194 mAh / g; It can maintain more than 92% of the initial capacity.

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Abstract

The invention relates to a preparation method of a lithium ion battery positive electrode material. The preparation method comprises the following steps: 1, dispersing vanadium oxide and graphene oxide in water and / or an organic solvent, sealing the obtained solution in a hydrothermal kettle, and carrying out a hydrothermal reaction and / or a solvothermal reaction at 100-130DEG C, wherein a feeding mass ratio of the vanadium oxide to the graphene oxide is 0.8-10:1; and 2, drying the product system obtained in step 1 by adopting anyone drying method of vacuum drying, freeze drying and supercritical drying to obtain a solid product which is the positive electrode material. The method is characterized in that a reducing agent is selectively added to the system obtained in the step 1 after the step 1 and before step 2 in order to carry out a reducing reaction. The positive electrode material obtained in the invention has the advantages of high conductivity, low dimensions, super excellent high-magnification performances, good cycle stability, high repeatability, simple process, short time and environmental protection.

Description

technical field [0001] The invention relates to a preparation method of a new lithium ion battery cathode material. Background technique [0002] With the continuous breakthrough of electronic technology and the international attention to energy and environmental protection, new secondary energy is developing rapidly and vigorously worldwide. Among them, lithium-ion secondary batteries have become the preferred power source for portable electronic appliances such as cameras, mobile phones, and notebook computers due to their excellent characteristics, and are also ideal potential power systems for future space technology and high-end energy storage systems. Lithium-ion secondary batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes, and have high charge storage density, fast charge and discharge characteristics, good charge and discharge efficiency and high cycle life, and low-cost lithium-ion secondary batteries. The prepara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/362H01M4/625H01M10/0525Y02E60/10
Inventor 张慧娟
Owner YADEA TECH GRP CO LTD
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