Method for preparing electrode materials for lithium ion batteries by defect control method

A lithium-ion battery and electrode material technology, which is applied in the field of lithium-ion battery electrode materials prepared by defect control method, can solve the problems of inability to obtain high-performance lithium-ion battery materials, and achieve low production cost, simple process route, and easy operation Effect

Inactive Publication Date: 2017-12-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, any single preparation method cannot obtain high-performance lithium-ion battery materials, and the electrochemical performance of the prepared materials must be further improved by controlling particle size and morphology, surface coating and bulk phase doping.

Method used

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  • Method for preparing electrode materials for lithium ion batteries by defect control method
  • Method for preparing electrode materials for lithium ion batteries by defect control method

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Experimental program
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Effect test

Embodiment 1

[0038] 1. Vanadium phosphate (VPO 4 ) During the preparation of the precursor, the V with certain defects is pre-formed 0.8 PO 4 ,; the vanadium source (V 2 o 5 ), phosphorus source (NH 4 h 2 PO 4 ) and reducing agent (carbon black) according to V x PO 4 Preparation of vanadium phosphate precursor by stoichiometric ratio, pre-forming intermediate V with certain defects 0.8 PO 4 ;

[0039] Solid-phase sintering method: Pretreat the vanadium source, phosphorus source and reducing agent according to the stoichiometric ratio (the reducing agent is in excess of 20%) under the protection of argon or nitrogen at 300°C for 4 hours to release NH 3 、H 2 O, etc., and then calcined at 500°C for 20h under the protection of argon or nitrogen, the intermediate with certain defects formed in advance can be synthesized.

[0040] 2. Will pre-form a certain defect V 0.8 PO 4 All or part of the defects are repaired to prepare a high-performance lithium vanadium phosphate material. ...

Embodiment 2

[0043] 1. Vanadium phosphate (VPO 4 ) During the preparation of the precursor, the V with certain defects is pre-formed 0.85 PO 4 ; The vanadium source (V 2 o 3 ), phosphorus source ((NH 4 ) 2 HPO 4 ) and reducing agent (sucrose) according to V 085 PO 4 Preparation of vanadium phosphate precursor by stoichiometric ratio, pre-forming intermediate V with certain defects 085 PO 4 ;

[0044] Hydrothermal reaction method: React the vanadium source, phosphorus source and reducing agent in an aqueous solution at 100°C for 30 hours according to the stoichiometric ratio (the reducing agent is in excess of 15%), wash the reaction product with water, and place it under the protection of argon or nitrogen Calcined at 500°C for 10 hours, the intermediate V with certain defects formed in advance can be synthesized 085 PO 4 .

[0045] 2. Will pre-form a certain defect V 0.8 PO 4 Perform all or part of the defect repair to prepare high-performance lithium vanadium phosphate (Li...

Embodiment 3

[0048] 1. Vanadium phosphate (VPO 4 ) During the preparation of the precursor, the V with certain defects is pre-formed 0.9 PO 4 ; The vanadium source (VO 2 ), phosphorus source (H 3 PO 4 ) and reducing agent (citric acid) according to V x PO 4 Preparation of vanadium phosphate precursor by stoichiometric ratio, pre-forming intermediate V with certain defects 0.9 PO 4 ;

[0049] Solvothermal reaction method: react the vanadium source, phosphorus source and reducing agent in an ethylene glycol solution at 120-240°C for 4-30 hours according to the stoichiometric ratio (where the reducing agent is in excess of 50%), and wash the reaction product in water Under the protection of argon or nitrogen, calcining at 500-720°C for 3-10h, the intermediate V with certain defects formed in advance can be synthesized. 0.9 PO 4 .

[0050] 2. Will pre-form a certain defect V 0.9 PO 4 Perform all or part of the defect repair to prepare high-performance lithium vanadium phosphate (L...

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Abstract

Provided is a method for preparing electrode materials for lithium ion batteries by a defect control method; in the process of preparation of the electrode materials for the lithium ion batteries, an idea of 'structure defect manufacturing-partial defect repairing' is introduced into design of structural defects, the migration rate of electrons and ions in materials is increased by control of the material structural defects so as to modify electrochemical performance, and the electrode materials for the lithium ion batteries having the advantages of high energy, high power, long life, safety and stability are obtained. The defect control method is simple in operation, is compatible with conventional production processes, is easy to transplant, and is easily applied to various material systems even negative electrode materials. The method is a quite promising practical method for manufacturing the electrode materials of the lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery electrode materials, and in particular relates to a method for preparing lithium-ion battery electrode materials by using a defect control method. Background technique [0002] Compared with other chemical power sources such as nickel-hydrogen batteries and lead-acid batteries, lithium-ion batteries have achieved great success in portable electronic devices due to their high energy density, high output voltage, long service life, good cycle performance, low self-discharge rate and environmental friendliness. wide application and rapid development. With the further aggravation of global energy and environmental problems, lithium-ion batteries have shown great application potential in power system markets such as hybrid vehicles and pure electric vehicles, as well as new energy storage fields such as solar energy and wind energy [Chemical Reviews 104 (2004) 4271- 4302]. However, t...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/485H01M10/0525C01B25/26C01B25/45
CPCC01B25/26C01B25/45H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 徐友龙孙孝飞
Owner XI AN JIAOTONG UNIV
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