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Bismuth phosphate positive electrode material with good conductivity for lithium battery and preparation method

A positive electrode material, bismuth phosphate technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor conductivity of bismuth phosphate, and achieve the effect of increasing the amount of lithium intercalation, improving the efficiency of chemical conversion reaction, and shortening the diffusion path

Inactive Publication Date: 2020-05-19
深圳市德惠电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor conductivity of bismuth phosphate is a defect of it as a positive electrode material.

Method used

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  • Bismuth phosphate positive electrode material with good conductivity for lithium battery and preparation method

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Add 1mol of bismuth nitrate pentahydrate into 6.7L of dilute nitric acid with a pH value of 2, stir at room temperature until completely dissolved to obtain a bismuth source solution; add 1mol of ammonium phosphate into 8.3L of deionized water, stir at room temperature until completely dissolved , to obtain a phosphorus source solution; add 0.03mol o-dichlorobenzene to the bismuth source solution, ultrasonically disperse for 30 minutes, then add phosphorus source solution, add phosphoric acid solution dropwise to adjust the pH value to 2, place it in a constant temperature water bath at 50°C, and ultrasonically oscillate for 30 minutes , and then suction filtered and washed to obtain a bismuth phosphate precursor;

[0032] (2) Add 0.133 mol of lithium hydroxide and 0.4 mol of ammonium vanadate into 1L of deionized water, oscillate ultrasonically for 30 minutes, then add ammonia water dropwise to adjust the pH value to 8.5, and heat to boiling. After reacting for 40 m...

Embodiment 2

[0036](1) Add 1mol of bismuth nitrate pentahydrate into 6.7L of dilute nitric acid with a pH value of 2, stir at room temperature until completely dissolved to obtain a bismuth source solution; add 1mol of potassium phosphate into 8.3L of deionized water, stir at room temperature until completely dissolved , to obtain a phosphorus source solution; add 0.05mol o-dichlorobenzene to the bismuth source solution, ultrasonically disperse for 20 minutes, then add phosphorus source solution, add phosphoric acid solution dropwise to adjust the pH value to 3, place it in a constant temperature water bath at 40°C, and ultrasonically oscillate for 30 minutes , and then suction filtered and washed to obtain a bismuth phosphate precursor;

[0037] (2) Add 0.05mol of lithium carbonate and 0.3mol of ammonium vanadate into 1L of deionized water, oscillate ultrasonically for 20 minutes, then add ammonia water dropwise to adjust the pH value to 8.5, and heat to boiling. After reacting for 60 minu...

Embodiment 3

[0041] (1) Add 0.5mol of bismuth sulfate heptahydrate into 3.3L of dilute nitric acid with a pH value of 2, stir at room temperature until completely dissolved to obtain a bismuth source solution; add 1mol of sodium phosphate into 7L of deionized water, and stir at room temperature until completely dissolved , to obtain a phosphorus source solution; add 0.04mol o-dichlorobenzene to the bismuth source solution, ultrasonically disperse for 25 minutes, then add phosphorus source solution, add phosphoric acid solution dropwise to adjust the pH value to 3, place it in a constant temperature water bath at 45°C, and ultrasonically oscillate for 40 minutes , and then suction filtered and washed to obtain a bismuth phosphate precursor;

[0042] (2) Add 0.1 mol of lithium hydroxide and 0.3 mol of ammonium vanadate into 1L of deionized water, oscillate ultrasonically for 25 minutes, then add ammonia water dropwise to adjust the pH value to 8.5, and heat to boiling. After reacting for 50 m...

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Abstract

The invention relates to the technical field of lithium battery positive electrode materials, and provides a bismuth phosphate positive electrode material with good conductivity for a lithium batteryand a preparation method. The method comprises the following steps of: respectively preparing a bismuth phosphate precursor and a lithium vanadate precursor, preparing a nano carbon black suspension,adding the bismuth phosphate precursor and the lithium vanadate precursor into the suspension to obtain composite wet gel, carrying out ball milling, and carrying out segmented calcination to obtain the lithium vanadate and carbon black composite bismuth phosphate positive electrode material. Compared with bismuth phosphate which is not subjected to composite modification, the electrical conductivity of the bismuth phosphate positive electrode material prepared by the method is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, and provides a bismuth phosphate cathode material with good conductivity for lithium batteries and a preparation method thereof. Background technique [0002] The energy density of lithium batteries is closely related to battery capacity and electromotive force, and is mainly controlled by the positive electrode capacity. When the positive electrode capacity is doubled, the energy density of the lithium battery can be increased by 57%, while the negative electrode capacity is increased by ten times, and the energy density of the lithium battery is only increased by 47%. Therefore, the main direction to improve the energy density of lithium batteries is to find better cathode materials. Chemical conversion reaction is a new lithium storage mechanism of lithium-ion batteries that has been gradually developed in recent years. Since the electrode materials based on this mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/583H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 蒋涛
Owner 深圳市德惠电池材料有限公司
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