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

An active oxide and cathode material technology, applied in the field of preparation of lithium ion battery materials, can solve the problems of hindering lithium ion transmission, affecting the rate performance of materials, and not having lithium ion channels, achieving excellent physical properties and electrochemical properties, The effect of improving air storage performance and simple preparation process

Active Publication Date: 2014-08-06
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 and 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 capacit...

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 discloses a method for coating a positive electrode material of a lithium ion battery with a lithium ion active oxide V2O5. The method of the present invention comprises the following steps: dissolving the vanadium source in a medium to form a solution, adding a lithium ion positive electrode material or its precursor, stirring to disperse it evenly, drying the vanadium source to crystallize or adsorb on the surface of the positive electrode material or its precursor, Calcining or mixing the precursor with lithium and then sintering at high temperature to prepare V2O5-coated lithium ion cathode materials. The battery cathode material prepared by the method of the present invention, because the vanadium source precursor is dissolved in the medium and adsorbed or crystallized on the surface of the material, the coating layer is evenly distributed on the surface of the cathode material and tightly combined, and because the surface nano-layer V Both CO2 / H2O and the electrolyte have good stability, so that the storage performance and cycle performance of the material are significantly improved. The invention effectively improves the storage performance and cycle life of the cathode material, and because the method is simple and the cost is low, it can be used in 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 Patents(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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