Bismuth phosphate positive electrode material with stable cycle performance for lithium battery and preparation method

A technology of cycle performance and positive electrode material, which is applied in battery electrodes, lithium storage batteries, nanotechnology for materials and surface science, etc., can solve the problems such as the cycle performance of positive electrode materials needs to be improved, high reaction activation energy, etc., to improve cycle stability. performance, low energy consumption and high efficiency

Active Publication Date: 2020-05-15
芜湖楚睿智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not overcome the change in the crystal structure of bismuth phosphate. Even though cerium phosphate can provide a lower energy barrier, the densified crystal region of bismuth phosphate still requires a higher reaction activation energy, so the cycle performance of the positive electrode material is still low. needs to be improved

Method used

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  • Bismuth phosphate positive electrode material with stable cycle performance for lithium battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 0.96mol of bismuth nitrate pentahydrate into 6.4L of dilute nitric acid with a pH value of 2, and stir at room temperature until completely dissolved to obtain a bismuth source solution; In nitric acid, heat to 150°C and keep stirring until it is completely dissolved to obtain a tellurium source solution; add 1.013mol of ammonium phosphate to 8.5L deionized water, and stir at room temperature until completely dissolved to obtain a phosphorus source solution;

[0029] (2) Add the tellurium source solution into the bismuth source solution and stir to mix evenly, then add 0.04mol o-dichlorobenzene, ultrasonically disperse for 25 minutes, then add the phosphorus source solution, add phosphoric acid solution dropwise to adjust the pH value to 2.5, and introduce hydrogen sulfide gas, placed in a constant temperature water bath at 45°C, continued ultrasonic oscillation for 45 minutes, and then filtered and washed to obtain Te 4+ doped BiPO 4 Precursor;

[0030] (3) P...

Embodiment 2

[0032] (1) Add 0.48mol of bismuth sulfate heptahydrate into 3.2L of dilute nitric acid with a pH value of 2, and stir at room temperature until completely dissolved to obtain a bismuth source solution; In nitric acid, heat to 150°C and keep stirring until it is completely dissolved to obtain a tellurium source solution; add 1.013mol potassium phosphate to 8.5L deionized water, and stir at room temperature until completely dissolved to obtain a phosphorus source solution;

[0033] (2) Add the tellurium source solution into the bismuth source solution and stir to mix evenly, then add 0.04mol o-dichlorobenzene, ultrasonically disperse for 20 minutes, then add the phosphorus source solution, add phosphoric acid solution dropwise to adjust the pH value to 2, and introduce hydrogen sulfide gas, placed in a constant temperature water bath at 50°C, continued ultrasonic oscillation for 60 min, and then filtered and washed to obtain Te 4+ doped BiPO 4 Precursor;

[0034] (3) Put the p...

Embodiment 3

[0036] (1) Add 0.97mol of bismuth nitrate pentahydrate into 6.5L of dilute nitric acid with a pH value of 2, stir at room temperature until completely dissolved to obtain a bismuth source solution; add 0.03mol of potassium tetrahydrogen tellurate into 1L of dilute nitric acid with a pH value of 2 , heated to 150°C and kept stirring until it was completely dissolved to obtain a tellurium source solution; add 1.01mol of sodium phosphate to 7.8L deionized water and stir at room temperature until completely dissolved to obtain a phosphorus source solution;

[0037] (2) Add the tellurium source solution into the bismuth source solution and stir to mix evenly, then add 0.04mol o-dichlorobenzene, ultrasonically disperse for 30 minutes, then add the phosphorus source solution, add phosphoric acid solution dropwise to adjust the pH value to 3, and introduce hydrogen sulfide gas, placed in a constant temperature water bath at 40°C, continued ultrasonic oscillation for 40 min, and then fi...

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Abstract

The invention relates to the technical field of lithium battery cathode materials, and provides a bismuth phosphate cathode material with stable cycle performance for a lithium battery and a preparation method. According to the method, bismuth phosphate is prepared from a bismuth source and a phosphorus source through a coprecipitation method under an acidic condition, sodium tetrahydrogentellurate or potassium tetrahydrogentellurate is introduced as a tellurium source, and hydrogen sulfide gas is introduced in the precipitation process, so that + 6 valence Te is reduced into + 4 valence Te and enters a BiPO4 structure to realize doping. Rearrangement of a bismuth phosphate crystal structure in the charging and discharging process can be reduced and formation of a compact crystal form canbe reduced by utilizing relatively high coordination number of Te4 +, so that the crystal structure is not obviously changed before and after charging and discharging, a larger energy barrier does notneed to be overcome during charging and discharging again, and the purpose of improving the cycling stability of the positive electrode material is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, and provides a bismuth phosphate cathode material with stable cycle performance for lithium batteries and a preparation method thereof. Background technique [0002] The invention belongs to the technical field of lithium battery cathode materials, and provides a bismuth phosphate cathode material with stable cycle performance for lithium batteries and a preparation method thereof. [0003] 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M10/052Y02E60/10
Inventor 蒋涛
Owner 芜湖楚睿智能科技有限公司
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