Bismuth phosphate/cerium phosphate composite lithium battery positive electrode material and preparation method

A battery cathode, cerium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity, low specific capacity retention, unsatisfactory cycle performance of cathode materials, etc., to improve cycle performance and reduce energy. Barrier, the effect of improving conductivity

Active Publication Date: 2019-04-16
泰州新滨江智慧科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before and after charging and discharging, BiPO 4 The crystal structure of BiPO is rearranged and basically completely changed, and a large energy barrier needs to be overcome when charging and discharging again. Therefore, BiPO 4 The cycle performance of cathode materials is not ideal, and the specific capacity retention rate after cycle use is low, which limits the BiPO 4 Application of Cathode Materials
In addition, BiPO 4 Poor electrical conductivity is also a defect in its use as a cathode material for lithium batteries

Method used

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  • Bismuth phosphate/cerium phosphate composite lithium battery positive electrode material and preparation method

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Add graphene oxide into deionized water, ultrasonically disperse for 5.5 hours, then add reducing agent ascorbic acid, ultrasonically disperse for 26 minutes, seal and put in an oven to make a hydrogel, then wash with deionized water, and finally freeze-dry to prepare Obtain hydrophobic graphene airgel; in the preparation process of hydrophobic graphene airgel, graphene oxide 4 weight parts, deionized water 83 weight parts, ascorbic acid 13 weight parts; Heating temperature is 88 ℃, time is 14h; The freeze-drying temperature is -35°C and the time is 2.5 hours;

[0025] (2) Disperse the hydrophobic graphene airgel prepared in step (1) in deionized water, add bismuth nitrate pentahydrate and cerium nitrate hexahydrate, and keep ultrasonic dispersion, so that the precipitate produced by hydrolysis is adsorbed on the graphene air condensation In the micropores of the glue;

[0026] (3) Add diammonium hydrogen phosphate to deionized water to make a solution, then add it...

Embodiment 2

[0029] (1) Add graphene oxide into deionized water, ultrasonically disperse for 5 hours, then add reducing agent ascorbic acid, ultrasonically disperse for 22 minutes, seal and put in an oven to make a hydrogel, wash with deionized water, and finally freeze-dry to obtain Hydrophobic graphene airgel; in the preparation process of hydrophobic graphene airgel, 3 parts by weight of graphene oxide, 85 parts by weight of deionized water, and 12 parts by weight of ascorbic acid; the heating temperature is 88 ° C, and the time is 13 hours; freezing The drying temperature is -32°C and the drying time is 3 hours;

[0030] (2) Disperse the hydrophobic graphene airgel prepared in step (1) in deionized water, add bismuth nitrate pentahydrate and cerium nitrate hexahydrate, and keep ultrasonic dispersion, so that the precipitate produced by hydrolysis is adsorbed on the graphene air condensation In the micropores of the glue;

[0031] (3) Add diammonium hydrogen phosphate to deionized wate...

Embodiment 3

[0034] (1) Add graphene oxide into deionized water, ultrasonically disperse for 6 hours, then add reducing agent ascorbic acid, ultrasonically disperse for 28 minutes, seal and put in an oven to make a hydrogel, wash with deionized water, and finally freeze-dry to obtain Hydrophobic graphene airgel; in the preparation process of hydrophobic graphene airgel, 5 parts by weight of graphene oxide, 82 parts by weight of deionized water, and 13 parts by weight of ascorbic acid; the heating temperature is 92 ° C, and the time is 13 hours; freezing The drying temperature is -37°C and the drying time is 2 hours;

[0035] (2) Disperse the hydrophobic graphene airgel prepared in step (1) in deionized water, add bismuth nitrate pentahydrate and cerium nitrate hexahydrate, and keep ultrasonic dispersion, so that the precipitate produced by hydrolysis is adsorbed on the graphene air condensation In the micropores of the glue;

[0036] (3) Add diammonium hydrogen phosphate to deionized wate...

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Abstract

The invention relates to the technical field of lithium battery positive electrode materials, and provides a bismuth phosphate/cerium phosphate composite lithium battery positive electrode material and a preparation method. According to the method, a hydrophobic graphene aerogel is firstly prepared through a reduction method; then, bismuth nitrate pentahydrate and cerium nitrate hexahydrate are added to a graphene aerogel dispersion, precipitates produced by bismuth salt and cerium salt hydrolysis are adsorbed in micropores of the graphene aerogel, a diammonium hydrogen phosphate solution is then added and a hydrothermal reaction is carried out, and a graphene aerogel-loaded bismuth phosphate/cerium phosphate composite material is prepared. According to the preparation method provided in the invention, the cycle performance of the bismuth phosphate positive electrode material is improved through doping of cerium phosphate, and through load of the graphene aerogel, the conductivity of the bismuth phosphate positive electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, and provides a bismuth phosphate / cerium phosphate composite lithium battery cathode material and a preparation method thereof. Background technique [0002] There are usually three reaction mechanisms for lithium battery cathode materials: traditional lithium ion intercalation reaction, alloying reaction with metal lithium, and chemical conversion reaction. Most of the current commercial lithium battery cathode materials are based on the traditional lithium ion intercalation reaction mechanism, which can only transfer no more than one electron, so the development is limited. In the chemical conversion reaction, all the oxidation states of the metal cations participate in the reaction, so that the metal cations are completely reduced to metal simple substances, and the realization of the multi-electron reaction endows a higher specific capacity. Especially in the case of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 赵宏伟
Owner 泰州新滨江智慧科技服务有限公司
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