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Lithium ion battery positive material vanadium lithium phosphate sol gelatin preparation method

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of difficult dispersion and mixing of raw materials, reduction of product electrochemical performance, and impact on product performance, so as to achieve uniform coating effect Complete, good cycle performance, and convenient reaction process

Inactive Publication Date: 2008-10-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported synthetic methods for lithium vanadium phosphate generally use high-temperature solid-phase synthesis. This method has many shortcomings in the synthesis of high-performance lithium vanadium phosphate materials: first, it is difficult to disperse and mix the raw materials uniformly. In order to make the raw materials fully The mixing method basically adopts the method of secondary ball milling, but in the process of ball milling, due to the existence of high temperature and high pressure environment, it is inevitable that there will be such as Li 3 PO 4 Impurities such as ions are generated, thereby affecting the performance of the product; secondly, because the raw materials are difficult to achieve the mixing at the atomic level, in order to make them fully react during the reaction, generally high temperatures above 900°C and long reaction times are required. These two inevitably lead to the increase and agglomeration of product particles.
However, high reaction temperature and long reaction time will undoubtedly reduce the electrochemical performance of the product.

Method used

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  • Lithium ion battery positive material vanadium lithium phosphate sol gelatin preparation method
  • Lithium ion battery positive material vanadium lithium phosphate sol gelatin preparation method
  • Lithium ion battery positive material vanadium lithium phosphate sol gelatin preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1.82g vanadium pentoxide powder is dissolved in 182ml concentration and is the hydrogen peroxide aqueous solution of 10% (percentage by volume), is made into the solution of 10g / L, forms orange-yellow transparent solution after 10 minutes, forms dark red solution after 2 hours, After 5 hours, a reddish-brown flocculent colloid was formed; the aqueous solution of 2.07g lithium nitrate, 3.45g ammonium dihydrogen phosphate and 1.8g glucose dissolved in distilled water was added in the colloidal solution formed (molar ratio, Li: V: P=3: 2:3), the colloid gradually swelled, and a uniform reddish-brown colloid was formed after 48 hours; the obtained colloid was dried in vacuum at 80°C, placed in a tube furnace, treated at 300°C for 5 hours under a hydrogen atmosphere, and cooled naturally to obtain Powder material: After the obtained powder material is ground, it is heated again to 800°C in a tube furnace, treated in a hydrogen atmosphere for 8 hours, and cooled naturally to o...

Embodiment 2

[0033] Dissolve 1.82g vanadium pentoxide powder in 364ml concentration of 5% (percentage by volume) hydrogen peroxide solution to form a 5g / L orange-yellow transparent solution. After 3 hours, a dark red solution is formed, and after 6 hours, a reddish-brown solution is formed. Flocculent colloids; 0.792g lithium hydroxide and 2.94g phosphoric acid dissolved in distilled water were added to the formed colloidal solution (molar ratio, Li:V:P=3.3:2:3), the colloids gradually swelled, and after 48 hours Form a uniform reddish-brown colloid; dry the obtained colloid in vacuum at 80°C, put it into a tube furnace, treat it at 200°C under a hydrogen atmosphere for 2 hours, and obtain a powder material after natural cooling; after grinding the obtained powder material, Heating again to 900° C. in a tube furnace, treating under a hydrogen atmosphere for 12 hours, and naturally cooling to obtain a lithium vanadium phosphate positive electrode material.

[0034] The XRD pattern of the pr...

Embodiment 3

[0036] Dissolve 1.82g vanadium pentoxide powder in 60ml concentration of 30% (volume percent) hydrogen peroxide aqueous solution to form a 30g / L orange-yellow transparent solution. After 1 hour, a dark red solution is formed, and after 3 hours, a reddish-brown solution is formed. Flocculent colloid; 3.162g lithium acetate, 3.96g diammonium hydrogen phosphate, and 0.07g sucrose dissolved in distilled water are added to the colloidal solution formed (molar ratio, Li:V:P=3.1:2:3), the colloid Gradually swell and form a uniform reddish-brown colloid after 48 hours; dry the obtained colloid in a vacuum at 80°C, put it in a tube furnace, process it at 500°C for 12 hours under an ammonia atmosphere, and obtain a powder material after natural cooling; After the powder material is ground, it is heated again to 500°C in a tube furnace, treated in an ammonia atmosphere for 2 hours, and naturally cooled to obtain a carbon-coated lithium vanadium phosphate positive electrode material, and t...

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Abstract

The invention discloses a sol-gel preparing method of vanadium lithium phosphate of lithium ionic battery anode, which comprises the following steps: dissolving V2O5 powder in the hydrogen peroxide solution to form flocculus gel; cladding vanadium lithium phosphate through adding soluble carbon clad material and the solution of lithium salt and phosphoric salt together; forming even stable gel; drying in the vacuum; placing the gel in the ceramic ship; predisposing under reduced atmosphere at 200-500 Deg C for 2-12h; grinding; disposing under the same atmosphere at 500-900 Deg C for 2-12h to obtain the product. The invention possesses high content and superior circulating property, which is fit for manufacturing high-property lithium ion anode.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a lithium ion secondary battery, in particular to a method for synthesizing a high-performance lithium vanadium phosphate positive electrode material by a sol-gel method. The lithium vanadium phosphate cathode material synthesized by the method has higher charge and discharge capacity and better cycle and rate performance. Background technique [0002] Lithium-ion secondary batteries have many advantages: high working voltage, usually the voltage of a single lithium-ion battery is 3.6V, while the voltage of MH-Ni and Cd-Ni batteries is 1.2V, a difference of 3 times; small size, light weight, High specific energy (specific energy is 3 times that of lead-acid batteries and 2 times that of various nickel batteries); long cycle life, much higher than other batteries; safe and fast charging, low self-discharge rate; no memory effect, long service life long. [0003] Therefore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 赵彦明付鹏申国培董有忠
Owner SOUTH CHINA UNIV OF TECH