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Method for preparing three-dimensional phosphorus-rich compound by combining electrostatic spinning method and low-temperature phosphating method, electrode material and potassium ion battery

An electrospinning, phosphorus-rich compound technology, used in phosphide, battery electrodes, secondary batteries, etc., can solve the problems of large metal phosphide particles, large volume expansion, electrode powdering, etc., to improve electronic conductivity , less energy consumption, and the effect of reducing the use of binders

Pending Publication Date: 2022-07-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, the metal phosphide particles obtained by the above method are relatively large. This typical large particle phosphide is easily broken when it reacts with potassium ions, resulting in large volume expansion and powdering of the electrode.

Method used

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  • Method for preparing three-dimensional phosphorus-rich compound by combining electrostatic spinning method and low-temperature phosphating method, electrode material and potassium ion battery
  • Method for preparing three-dimensional phosphorus-rich compound by combining electrostatic spinning method and low-temperature phosphating method, electrode material and potassium ion battery
  • Method for preparing three-dimensional phosphorus-rich compound by combining electrostatic spinning method and low-temperature phosphating method, electrode material and potassium ion battery

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preparation example Construction

[0035] The negative electrode material prepared by the preparation technology used in the following embodiments of the present invention can effectively alleviate the volume expansion effect of the material during the charging and discharging process, and the interwoven carbon framework can improve the electronic conductivity. The resulting flexible integrated electrode reduces the use of binders and greatly reduces the likelihood of active material peeling off the surface of the current collector.

[0036] The method of combining the electrospinning technology and the low-temperature gas-phase phosphating of sodium hypophosphite in the following examples of the present invention can prepare metal phosphorus-rich compounds with smaller particles, and the method is simple to operate, has strong operability, and can prepare large-area flexible Integrated electrode, suitable for industrial production.

[0037] The following embodiments of the present invention do not have any spe...

Embodiment 1

[0043] In this embodiment, a method for preparing a three-dimensional phosphorus-rich compound by combining an electrospinning method with a low-temperature phosphating method includes the following steps:

[0044] a. Precursor preparation: prepare Cu(NO) with a molar concentration ratio of 1:3 3 ) 2 The precursor solution with urea was hydrothermally heated at 120°C for 6 hours to obtain the precursor containing copper element, which was filtered, washed and dried;

[0045] b. Preparation of polymer fibers: PAN and DMF are mixed uniformly in a mass ratio of 1:10 to prepare a preparation solution for electrospinning; the obtained copper-containing precursor is uniformly dispersed in the spinning solution, and the copper-containing precursor and high The mass ratio of polymer PAN is 1:2.5, and the polymer fiber fabric is spun by electrospinning technology according to the injection rate of 0.5mL / L and the high voltage condition of 10kV;

[0046] c. Preparation of three-dimens...

Embodiment 2

[0049] This embodiment is basically the same as the first embodiment, and the special features are:

[0050] In this embodiment, a method for preparing a three-dimensional phosphorus-rich compound by combining an electrospinning method with a low-temperature phosphating method includes the following steps:

[0051] a. Precursor preparation: prepare CoCl with a molar concentration ratio of 1:4 2 The precursor solution with ammonia water was hydrothermally heated at 120 °C for 5 h to obtain the precursor containing cobalt element, which was filtered, washed and dried;

[0052] b. Preparation of polymer fibers: PAN and DMF are mixed uniformly in a mass ratio of 1:10 to prepare a preparation solution for electrospinning; the obtained cobalt-containing precursor is uniformly dispersed in the spinning solution, and the cobalt-containing precursor and high The mass ratio of polymer PAN is 1:3, according to the injection rate of 0.6mL / L and the high voltage condition of 11kV, the pol...

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Abstract

The invention discloses a method for preparing a three-dimensional phosphorus-rich compound by combining an electrostatic spinning method and a low-temperature phosphating method, and the prepared three-dimensional phosphorus-rich compound can be applied to a potassium ion battery with high capacity and long service life as an electrode material. The preparation method comprises the following steps: firstly, performing hydrothermal reaction on metal salt and a metal salt hydrolysis promoting agent to obtain a precursor containing metal elements; then dispersing the precursor into a spinning solution of a high polymer and an organic solvent, and obtaining polymer fibers through electrostatic spinning; and carrying out two-step heat treatment on the polymer fiber, and carrying out low-temperature gas-phase phosphorization to obtain the phosphorus-rich compound MPx / CNF flexible integrated electrode material which is used for a negative electrode of a potassium ion electrode. According to the flexible MPx / CNF electrode, one-dimensional nanofibers and uniformly distributed MPx nanoparticles are mutually connected to form a three-dimensional conductive network structure, so that aggregation of the MPx nanoparticles is prevented, volume expansion caused by the MPx nanoparticles in a potassium deintercalation process is relieved, high capacity and long cycle performance are realized, and the flexible MPx / CNF electrode can be prepared on a large scale and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method and application of a phosphide-rich electrode material, which are applied to the technical field of high-capacity and long-life potassium ion batteries. Background technique [0002] With the development of smart electronic devices, the demand for flexible wearable electronics has increased dramatically. As the core of electronic devices, batteries put forward higher requirements for high capacity, cycle stability and bending performance of batteries. Lithium-ion batteries have become a commercialized electrochemical energy storage device widely used in electronic products, but the rapid growth of market demand and the scarcity of lithium resources have seriously hindered the further application of lithium-ion batteries. Potassium-ion batteries (KIBs) are similar to lithium-ion batteries (Li / Li + is -3.04eV) similar to the redox potential K / K + It has become one of the most promising energy storage devic...

Claims

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Application Information

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IPC IPC(8): C01B25/08D01F6/46B82Y40/00H01M4/58H01M10/054
CPCC01B25/08B82Y40/00D01F6/46H01M10/054H01M4/5805C01P2004/80Y02E60/10
Inventor 焦正杨宇杰王琳琳
Owner SHANGHAI UNIV
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