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Preparation method for granular Cu3(PO4)2/super P positive electrode material of lithium ion battery

A lithium-ion battery and cathode material technology, applied in the field of electrochemistry, can solve problems such as poor conductivity and unsatisfactory conductivity, and achieve the effects of improving poor conductivity, rich raw materials, and low energy consumption

Active Publication Date: 2019-08-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrode of the lithium-ion battery must be a mixed conductor of ions and electrons. However, the conductivity of the positive electrode materials used in lithium-ion batteries cannot meet the requirements [Yue Peng. Research progress of lithium-rich manganese-based positive electrode materials for lithium-ion batteries [J ]. Shandong Chemical Industry, 2016, 45(18).]
Most of the cathode materials are transition metal oxides and phosphates of transition metals, but their conductivity is poor, and a conductive agent must be added to improve the conductivity of the electrode [Yin Yanping, Wang Zhong, Wang Zhenyao. The shape of the conductive agent affects the performance of lithium-rich cathode materials. The influence of exertion[J].Power Technology,2017,41(3):337-339.]

Method used

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  • Preparation method for granular Cu3(PO4)2/super P positive electrode material of lithium ion battery
  • Preparation method for granular Cu3(PO4)2/super P positive electrode material of lithium ion battery
  • Preparation method for granular Cu3(PO4)2/super P positive electrode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 1) Dissolve ammonium phosphate in deionized water, stir and sonicate for 10 minutes to make solution A with a concentration of 0.28 mg / mL;

[0025] 2) According to the mass ratio of copper oxide and ammonium phosphate as 1:2.8, add copper oxide into solution A and magnetically stir for 1 hour, then adjust the pH value of the solution to 4, then pour the solution into a petri dish, put it in the refrigerator and freeze it for 12 hours to obtain solid B;

[0026] 3) Put the frozen solid B into a freeze dryer to dry for 12 hours, so that the phosphate is fully recrystallized on the surface of copper oxide to obtain a completely dried sample C;

[0027] 4) Spread sample C evenly in the quartz crucible, then put the crucible into the muffle furnace, -1 The heating rate was raised from room temperature to 350°C for 1h, and then at 2°C·min -1 The heating rate is increased to 650°C for 1 hour, and the heat-treated sample D is obtained;

[0028] 5) Take 1g of sample D and mix...

Embodiment 2

[0033] 1) Dissolve potassium phosphate in deionized water, stir and sonicate for 20 minutes to make solution A with a concentration of 0.3 mg / mL;

[0034] 2) According to the mass ratio of copper oxide and potassium phosphate as 1:3, add copper oxide to solution A and magnetically stir for 2 hours, adjust the pH value of the solution to 5, then pour the solution into a petri dish, put it in the refrigerator and freeze it for 18 hours to obtain solid B;

[0035] 3) Put the frozen solid B into a freeze dryer and dry it for 18 hours, so that the phosphate is fully recrystallized on the surface of copper oxide to obtain a completely dried sample C;

[0036] 4) Spread sample C evenly in the quartz crucible, then put the crucible into the muffle furnace, -1 The heating rate was raised from room temperature to 480°C for 2 hours, and then at 3°C·min -1 The heating rate is increased to 680°C for 1.5h, and the sample D after heat treatment is obtained;

[0037] 5) Mix 1g sample D wit...

Embodiment 3

[0039] 1) Dissolve ammonium phosphate in deionized water, stir and sonicate for 30 minutes to make solution A with a concentration of 0.4 mg / mL;

[0040] 2) According to the mass ratio of copper oxide and ammonium phosphate as 1:4, add copper oxide into solution A and stir magnetically for 3 hours, then adjust the pH value of the solution to 6, then pour the solution into a petri dish, put it in the refrigerator and freeze it for 24 hours to obtain solid B;

[0041] 3) Put the frozen solid B into a freeze dryer to dry for 24 hours, so that the phosphate is fully recrystallized on the surface of copper oxide to obtain a completely dried sample C;

[0042] 4) Spread sample C evenly in the quartz crucible, then put the crucible into the muffle furnace, -1 The heating rate was raised from room temperature to 500°C for 3h, and then at 4°C·min -1 The heating rate is increased to 700°C for 2 hours, and the sample D after heat treatment is obtained;

[0043] 5) Mix 1g of sample D w...

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Abstract

The invention relates to a preparation method for a granular Cu3(PO4)2 / super P positive electrode material of a lithium ion battery. The preparation method comprises the following steps: obtaining a copper phosphate precursor through a solid-phase method, carrying out stage heating in a muffle furnace, and carrying out full ball milling on Cu3(PO4)2 subjected to heat treatment and super P to obtain the Cu3(PO4) 2 / super P composite electrode material. According to the invention, the super P with 'three high performances and one excellent performance' is compounded, namely high specific surfacearea, high structure, high purity and excellent electrical conductivity, so that the problem of poor electrical conductivity of the copper phosphate is improved. The Super P has the good thermal conductivity to ensure the safety and service life of a battery, and the electrical conductivity of the material can be improved. Compared with the prior art, the raw materials are rich, cheap, easily available and safe, high-temperature sintering is not needed in the compounding process, the energy consumption is low, the preparation process is simple, and the application of the composite material isexpected to improve the performance of the lithium ion battery.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of electrochemistry, in particular to a granular Cu 3 (PO 4 ) 2 / super P lithium ion battery cathode material preparation method. Background technique [0003] Lithium-ion batteries have been widely studied for their high energy density, high operating voltage, no memory effect, excellent cycle performance, and environmental friendliness. The electrode of the lithium-ion battery must be a mixed conductor of ions and electrons. However, the conductivity of the positive electrode materials used in lithium-ion batteries cannot meet the requirements [Yue Peng. Research progress of lithium-rich manganese-based positive electrode materials for lithium-ion batteries [J ]. Shandong Chemical Industry, 2016, 45(18).]. Most of the cathode materials are transition metal oxides and phosphates of transition metals, but their conductivity is poor, and a conductive agent must be added to improve the conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 曹丽云王海党欢黄剑锋李嘉胤王羽偲嘉冯亮亮冯永强
Owner SHAANXI UNIV OF SCI & TECH
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