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Preparation method of lithium ion anode material coated with lithium ion activating oxide V2O5

A technology of active oxides and cathode materials, which is applied in the field of preparation of lithium-ion battery materials, can solve the problems of affecting the rate performance of materials, not having lithium ion channels, hindering lithium ion transmission, etc., achieving excellent physical and electrochemical properties, Improved air storage performance and low production cost

Active Publication Date: 2012-08-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of coating material does not have lithium ion channels, which hinders lithium ion transport to a certain extent and affects the rate performance of the material.

Method used

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  • Preparation method of lithium ion anode material coated with lithium ion activating oxide V2O5
  • Preparation method of lithium ion anode material coated with lithium ion activating oxide V2O5
  • Preparation method of lithium ion anode material coated with lithium ion activating oxide V2O5

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Will NH 4 VO 3 Dissolve in deionized water at 60°C, under constant stirring, at V 2 o 5 The coating amount is calculated as 1%, and LiNi is added to it 0.8 co 0.1 mn 0.1 o 2 material and keep the temperature constant. After evaporating water in a 60°C oil bath, heat treatment at 400°C for 6 hours, and cool naturally to obtain the coating material. For its physical and chemical properties, see figure 1 , figure 2 , image 3 with Figure 4 . XRD shows no V 2 o 5 It can be seen from the TEM image that there is a uniform layer of V with a thickness of about 2nm on the surface of the material. 2 o 5 layer, while it can be seen that V 2 o 5 layer with LiNi 0.8 co 0.1 mn 0.1 o 2 There is no clear boundary between the host material and this is because the V 2 o 5 Will be with LiNi 0.8 co 0.1 mn 0.1 o 2 Reaction of Li residues on the material surface. The resulting product was assembled into a button battery to measure its charge and discharge capaci...

Embodiment 2

[0034] Will NH 4 VO 3 Dissolve in 5% ammonia water, under constant stirring, at V 2 o 5 The coating mass ratio is calculated as 1%, and Ni is added to it 0.8 co 0.1 mn 0.1 (OH) 2 materials, stir and disperse evenly, and evaporate the water in an 80°C oil bath, dry the powder at 120°C and mix with Li 2 CO 3 Mix evenly, keep warm at 500° C. and 750° C. for 5 hours and 15 hours respectively under an oxygen atmosphere, and cool naturally to obtain a coating material. The resulting product was assembled into a button battery to measure its charge and discharge capacity and rate performance, and charge and discharge were performed at different rates. From the 2C rate cycle performance diagram of the material at room temperature, it can be seen that the capacity of the coated material does not attenuate after 100 2C cycles.

Embodiment 4

[0036] will V 2 o 5 Dissolve in 3% hydrogen peroxide, under constant stirring, at V 2 o 5 The coating amount is calculated as 1%, and LiNi is added to it 0.8 co 0.1 mn 0.1 o 2 Materials, strong stirring and ultrasonic dispersion make the system evenly mixed. The coating material precursor was obtained by spray drying, kept at 400° C. for 5 hours in an air atmosphere, and cooled naturally to obtain the coating material. The resulting product was assembled into a button battery to measure its charge and discharge capacity and rate performance, and charge and discharge were performed at different rates. The results are shown in Table 1. In order to compare the storage stability of the material in the air before and after the material coating, the two materials were exposed to the air, and the H in the air adsorbed by the material was determined by titration method. 2 O and CO 2 content.

[0037] Table 1 Electrochemical properties of materials before and after coating ...

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Abstract

The invention provides a preparation method of a lithium ion anode material coated with lithium ion activating oxide V2O5. The preparation method provided by the invention comprises the following steps of: dissolving a vanadium source in a medium to form a solution; adding the lithium ion anode material or a precursor of the lithium ion anode material; stirring to uniformly diffuse; drying so as to enable the vanadium source to be crystallized or absorbed on the surface of the anode material or the surface of the precursor; and preparing the lithium ion anode material coated with the V2O5 through low-temperature roasting or high-temperature roasting after mixing lithium with the precursor. According to the battery anode material prepared by using the method provided by the invention, the vanadium source precursor is dissolved in the medium and is crystallized or absorbed on the surface of the material, so that a coating layer is uniformly distributed and compactly combined with the surface of the anode material. Furthermore, the surface nanometer layer V2O5 has good stability to CO2 / H2O and electrolyte in air, so that the storage property and the circulation property of the material can be obviously improved. The storage property can be effectively improved and the circulation service life of the anode material is prolonged. Furthermore, the preparation method has the advantages of being simple, low in cost and capable of being used for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery material, in particular to a lithium ion active oxide V 2 o 5 A method for preparing a coated lithium ion cathode material. Background technique [0002] As a new type of energy storage device, lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, good safety performance, and no memory effect, which are of great significance for solving energy shortages and reducing environmental pollution. The positive and negative electrode materials of lithium-ion batteries are the key factors that determine their electrochemical performance, safety performance, and price and cost. In the past few decades, the research on cathode materials for lithium-ion batteries has mainly focused on the layered structure LiCoO 2 , LiNiO 2 , spinel-structured LiMn 2 o 4 and olivine structure LiMPO 4 (M=Fe, Mn, V) and their derivatives. Polyanion cathod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 王志兴熊训辉郭华军李新海彭文杰胡启阳
Owner CENT SOUTH UNIV
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