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A core-shell structure lixv2o5/liv3o8 lithium intercalation material and its preparation method

A core-shell structure and composite nanomaterial technology is applied in the field of high-performance composite lithium vanadate positive electrode material with core-shell structure and its preparation, which can solve the problems of poor rate performance and short cycle life, and improve the cycle stability performance. , The effect of improving cycle performance and rate performance

Active Publication Date: 2015-09-23
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to propose a high-capacity, long-life and high-rate lithium-ion battery positive electrode material with a core-shell structure and a preparation method thereof. The preparation method is a novel and simple in-situ conversion method. 3 o 8 As the matrix, by heat treatment in a reducing atmosphere in LiV 3 o 8 Direct generation of ultrathin Li on the surface x V 2 o 5 layer, thus realizing the core-shell structure Li x V 2 o 5 / LiV 3 o 8 One-step preparation of composite materials; solves the problems of short cycle life and poor rate performance of such materials in the prior art

Method used

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  • A core-shell structure lixv2o5/liv3o8 lithium intercalation material and its preparation method
  • A core-shell structure lixv2o5/liv3o8 lithium intercalation material and its preparation method
  • A core-shell structure lixv2o5/liv3o8 lithium intercalation material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] Weigh 2.5g flake LiV 3 o 8 Nanomaterials are placed in a tube furnace. at 120cm 3 The flow rate of / min is continuously injected with argon protective gas. After half an hour, it is heated to 450°C at a heating rate of 15°C / min for 10 minutes, and the tube furnace is turned off, and it is naturally cooled to room temperature to obtain LiV without reducing gas treatment. 3 o 8 , for comparative studies. The crystal structure of the material is shown in figure 1 Example 1 in . It can be seen from the XRD curve that the prepared product belongs to the monoclinic crystal system, P2 1 / m point group.

[0029] Mix the prepared target material, conductive agent Super P, and binder PVDF uniformly in a certain mass ratio (80:10:10), use tetrahydrofuran (THF) as the solvent, stir thoroughly for 6 hours, and use a film applicator to quickly spread the slurry Spread evenly on aluminum foil. After the solvent evaporates, place the coated pole piece in a vacuum drying oven a...

Embodiment 2

[0031] Weigh 2.52g flake LiV 3 o 8 Nanomaterials are placed in a tube furnace. at 120cm 3 The flow rate of / min is continuously injected with argon protective gas. After half an hour, it is heated to 450°C at a heating rate of 15°C / min for 10 minutes, and the argon flow is immediately switched to H. 2 / Ar(H 2 volume 5%) mixed gas, H 2 / Ar mixed gas flow rate is 60cm 3 / min, stop the gas injection after 1min of treatment, close the tube furnace, and cool down to room temperature naturally to obtain the target material. Its crystal structure is shown in figure 1 Example 2 in . It can be seen from the XRD curve that the prepared product belongs to the monoclinic crystal system, P2 1 / m point group, there is no obvious impurity diffraction peak, indicating that 1min H 2 Heat treatment in LiV / Ar mixed gas 3 o 8 Li formed on the surface x V 2 o 5 The content is very small, below the detection limit of XRD diffraction.

[0032] The manufacturing process and testing of ...

Embodiment 3

[0034] Weigh 2.52g flake LiV 3 o 8 Nanomaterials are placed in a tube furnace. at 120cm 3 The flow rate of / min is continuously injected with argon protective gas. After half an hour, it is heated to 450°C at a heating rate of 15°C / min for 10 minutes, and the argon flow is immediately switched to H. 2 / Ar(H 2 volume 5%) mixed gas, H 2 / Ar mixed gas flow rate is 60cm 3 / min, stop the gas injection after 5 minutes of treatment, turn off the tube furnace, and let it cool down to room temperature naturally to obtain the target material. Its crystal structure is shown in figure 1 Example 3 in . It can be seen from the XRD curve that the prepared product belongs to the monoclinic crystal system, P2 1 / m point group, there is no obvious impurity diffraction peak, indicating that 5min H 2 / Ar mixed gas heat treatment in LiV 3 o 8 Li formed on the surface x V 2 o 5 Also rarely, its content is below the detection limit of XRD diffraction.

[0035] The manufacturing proces...

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Abstract

The invention discloses a LixV2O5 / LiV3O8 lithium-embedded material with a core-shell structure and a preparation method thereof. The preparation method comprises the following steps: performing heat treatment for reduction on LiV3O8 in a tube furnace to form a LixV2O5 / LiV3O8 core-shell material. The thickness of a LixV2O5 outer layer in a target product can be effectively controlled by controlling the flow of reducing gas. With introduction of the LixV2O5 shell layer, the LiV3O8 can be effectively protected, and the interface electrochemical properties of electrodes can be improved remarkably, so that the electrochemical performance of the material is greatly improved. The prepared LixV2O5 / LiV3O8 composite lithium-embedded material has excellent cycle stability and high rate performance. The method is short in process flow, simple in operation and low in cost, and industrial production is easily realized.

Description

technical field [0001] The invention belongs to the technical field of high-energy battery materials, and in particular relates to a high-performance composite lithium vanadate cathode material with a core-shell structure and a preparation method thereof. Background technique [0002] Vanadium oxy compounds have become a research hotspot in recent years because of their relatively low cost, simple synthesis method, and high specific capacity. my country is rich in vanadium resources, but the development of vanadium mines is mainly concentrated on primary products, and the comprehensive utilization of vanadium resources is not high, which restricts the development of vanadium industry. Therefore, the development of high-capacity vanadium-based compounds as new lithium-ion battery intercalation materials is of great significance for optimizing the utilization of vanadium resources in my country and promoting economic development. Among the vanadium-based lithium intercalation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485
CPCY02E60/122H01M4/366H01M4/485Y02E60/10
Inventor 王海燕孙旦蒋介草陈红波唐有根刘平刘洪涛
Owner CENT SOUTH UNIV
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