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Flexible lithium/sodium ion battery negative electrode material and preparation method thereof

A technology for sodium ion batteries and negative electrode materials, applied in the field of electrochemistry, can solve the problems of poor contact between active materials and current collectors, poor electronic conductivity, and large volume changes, and achieve excellent electrochemical performance, good flexibility, and production technology. simple effect

Pending Publication Date: 2022-01-11
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, manganese oxide has become a hot spot in the research of lithium / sodium ion batteries due to its good electrochemical properties. However, during the research process, it was found that when manganese oxide is used as lithium / sodium ion negative electrode materials, there are the following disadvantages: in the process of charging and discharging , the volume changes greatly; it is prone to pulverization, resulting in poor contact between the active material and the current collector, resulting in poor cycle performance; its electronic conductivity is poor during charge and discharge

Method used

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  • Flexible lithium/sodium ion battery negative electrode material and preparation method thereof
  • Flexible lithium/sodium ion battery negative electrode material and preparation method thereof
  • Flexible lithium/sodium ion battery negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0025] The preparation method of flexible lithium / sodium ion battery negative electrode material specifically comprises the following steps:

[0026] 1) Stir and disperse 0.01g of zinc acetate, 0.02g of manganese acetate and 0.2g of polyacrylonitrile into 6ml of dimethylformamide solution to form a spinning precursor solution;

[0027] 2) Transfer the obtained precursor solution into a syringe, the advance speed of the syringe pump is 0.01cm / min, the spinning voltage is 13kV, and the distance between the receiving roller and the front end of the syringe is 8cm, and the precursor fiber film is prepared;

[0028] 3) Put the obtained precursor fiber film into a tube furnace for pre-oxidation, the temperature is set to 200°C, the heating rate is 1°C / min, the pre-oxidation time is 1h, and the nitrogen atmosphere is used to obtain the pre-oxidized precursor fiber film ;

[0029] 4) Put the obtained pre-oxidized precursor fiber film into a tube furnace for high-temperature carboniza...

Embodiment 2

[0031] 1) Stir and disperse 0.02g of zinc acetate, 0.04g of manganese acetate and 0.3g of polyacrylonitrile into 6ml of dimethylformamide solution to form a spinning precursor solution;

[0032] 2) Transfer the obtained precursor solution into a syringe, the advance speed of the syringe pump is 0.02cm / min, the spinning voltage is 13.5kV, and the distance between the receiving roller and the front end of the syringe is 8.5cm, and the precursor fiber film is prepared;

[0033] 3) Put the obtained precursor fiber film into a tube furnace for pre-oxidation. The temperature is set at 210°C, the heating and cooling rates are both 1°C / min, the pre-oxidation time is 1h, and the nitrogen atmosphere is used to obtain the pre-oxidized precursor body fibrous membrane;

[0034] 4) Put the obtained pre-oxidized precursor fiber film into a tube furnace for high-temperature carbonization. The temperature is set at 750 °C, the heating and cooling rates are both 1 °C / min, the carbonization time...

Embodiment 3

[0036] 1) Stir and disperse 0.05g of zinc acetate, 0.1g of manganese acetate and 0.6g of polyacrylonitrile into 6ml of dimethylformamide solution to form a spinning precursor solution;

[0037] 2) Transfer the obtained precursor solution into a syringe, the advance speed of the syringe pump is 0.05cm / min, the spinning voltage is 14 kV, and the distance between the receiving roller and the front end of the syringe is 8.5cm, and the precursor fiber membrane is prepared;

[0038] 3) Put the obtained precursor fiber film into a tube furnace for pre-oxidation. The temperature is set to 220°C, the heating and cooling rates are both 1°C / min, the pre-oxidation time is 1h, and the nitrogen atmosphere is used to obtain the pre-oxidized precursor body fibrous membrane;

[0039] 4) Put the obtained pre-oxidized precursor fiber film into a tube furnace for high-temperature carbonization. The temperature is set to 750°C, the heating and cooling rates are both 1°C / min, the carbonization time...

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Abstract

The invention discloses a flexible lithium / sodium ion battery negative electrode material and a preparation method thereof, the flexible electrode material adopts an electrostatic spinning method, manganese oxide is uniformly distributed on one-dimensional carbon fiber to form a bamboo-like flexible electrode, and the diameter of the carbon fiber is about 700nm. The preparation method comprises the following steps of: stirring and dispersing zinc acetate, manganese acetate and polyacrylonitrile into a dimethylformamide solution to form a uniform spinning precursor; transferring the spinning precursor liquid into an injector, and adjusting proper spinning conditions to prepare a fiber membrane precursor; and then, utilizing a heat treatment method to carbonize the precursor fiber membrane to finally prepare the bamboo-like manganese oxide fiber membrane with controllable size and excellent flexibility. The process is simple, the cost is low, and the obtained bamboo-like manganese oxide fiber membrane has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a flexible lithium / sodium ion battery negative electrode material prepared by electrospinning and high-temperature calcination and a preparation method thereof. Background technique [0002] Lithium / sodium ion batteries have many advantages such as high energy density and good reversibility, and have become the main energy storage devices in the field of energy storage. However, how to develop higher-performance batteries to meet the growing market demand has become a current research hotspot. In flexible wearable devices, flexible energy storage batteries become the key, and flexible electrode materials are the top priority. Manganese-based metal oxides have the advantages of rich raw materials, safety and non-toxicity, no pollution to the environment, and high theoretical specific capacity. At the same time, manganese-based oxides have a lower working volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50D06C7/04D04H1/728D04H1/43C01G45/02
CPCH01M4/50C01G45/02D04H1/728D04H1/43D06C7/04C01P2004/80C01P2004/62C01P2004/04C01P2006/40C01P2004/03Y02E60/10
Inventor 钟晓斌刘汉涛张志文韩文艳范薇张艳岗梁君飞
Owner ZHONGBEI UNIV
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