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Sodium ion battery electrode and preparation method thereof

A sodium-ion battery and electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor rate performance, cycle performance, and poor electrochemical performance, and achieve excellent electrochemical performance, low equipment requirements, The effect of improving electrical conductivity

Active Publication Date: 2015-09-23
SHANGHAI SINOPOLY JIAHUA BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the disadvantages of poor electrochemical performance, poor rate performance and cycle performance of sodium ion battery electrodes in the prior art, and provide a sodium ion battery electrode and its preparation method

Method used

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  • Sodium ion battery electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method for a sodium ion battery electrode, comprising the steps of:

[0032] (1) 0.3g graphene, 0.7g P2-Na 2 / 3 Ni 1 / 3 mn 2 / 3 o 2 The active material was mixed with 100mL ethanol, ultrasonically dispersed for 30 minutes, and the dispersion liquid was obtained;

[0033] (2) Under the pressure of -1atm, pass the dispersed material liquid through a microporous filter membrane with a pore size of 100nm, and suction filter for 12 hours to obtain a composite material;

[0034] (3) Vacuum-dry the composite material at 120°C for 24 hours, slice it, and obtain it.

[0035] The prepared sodium ion battery electrode is used as a working electrode, and the metal sodium sheet is used as a counter electrode, containing 1mol / L NaClO 4 The EC:PC (1:1) organic solution is used as the electrolyte, and it is assembled into a button battery in a glove box filled with argon atmosphere for electrochemical performance testing. The charge and discharge cut-off voltage is 2V-4...

Embodiment 2

[0037] A preparation method for a sodium ion battery electrode, comprising the steps of:

[0038] (1) 0.1g graphene, 0.9g Na 3 V 2 (PO 4 ) 3 The active material was mixed with 300mL ethanol, and ultrasonically dispersed for 20 minutes to obtain a dispersion liquid;

[0039] (2) Under the pressure of -0.8atm, pass the dispersed material liquid through a microporous membrane with a pore size of 200nm, and filter it for 10 hours to obtain a composite material;

[0040] (3) Vacuum-dry the composite material at 100°C for 20 hours, slice it, and obtain it.

[0041] The obtained sodium ion battery electrode is used as the working electrode, and the button battery assembly and test are the same as in Example 1. It is measured that the reversible capacity is 91mAhg under the charging and discharging conditions of 2.6V-3.7V and 1C. -1 ; The 10C charge and discharge performance test shows that its 10C / 1C rate performance is 58%.

Embodiment 3

[0043] A preparation method for a sodium ion battery electrode, comprising the steps of:

[0044] (1) Mix 0.5g of graphene, 0.5g of hard carbon active material and 200mL of ethanol, and ultrasonically disperse for 60 minutes to obtain a dispersion liquid;

[0045] (2) Under the pressure of -0.9atm, pass the dispersed material liquid through a microporous membrane with a pore size of 300nm, and filter it for 20 hours to obtain a composite material;

[0046] (3) Vacuum dry the composite material at 120°C for 48 hours, slice it, and obtain it.

[0047] The obtained sodium ion battery electrode is used as a working electrode, and the assembled button battery is the same as in Example 1. It is measured that under the charging and discharging conditions of 2V-0.1V, 1C, its reversible capacity is 273mAhg -1 ; The 10C charge and discharge performance test shows that its 10C / 1C rate performance is 79%.

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Abstract

The invention discloses a sodium ion battery electrode and a preparation method thereof, wherein the preparation method comprises the steps: (1) mixing graphene, an active material and ethanol, carrying out ultrasonic dispersion, to obtain a dispersed material liquid, wherein the mass ratio of graphene to the active material is (1:9)-(5:5), and the active material is a component I or a component II; (2) carrying out suction filtration on the dispersed material liquid through a microporous filter membrane, to obtain a composite material; and (3) drying the composite material, and thus obtaining the product. According to the preparation method of the sodium ion battery electrode, conventional binders and current collectors in the field are not used, the electric conductivity of the electrode is improved, moreover, the preparation method is simple in technology, low in equipment requirements and short in production cycle, and the prepared sodium ion battery electrode has good stability. The sodium ion battery electrode is excellent in electrochemical performance, high in charge and discharge capacity, excellent in rate performance, and good in cycle performance.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a sodium ion battery electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been used in portable electronic devices, medium and large energy storage devices, and electric vehicles. Especially in recent years, the research on their application in large energy storage devices and electric vehicles has achieved explosive growth. However, with the large-scale application of lithium-ion batteries now and in the foreseeable future, the problem of limited lithium resources has gradually become prominent, which limits the development of lithium-ion batteries to a certain extent. However, sodium-ion batteries have attracted extensive attention in recent years due to their abundant resources, low cost, and similar electrochemical properties to lithium-ion batteries. [0003] However, since the diameter of sodium ions is larger than that of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/1393
CPCY02E60/10
Inventor 杨德志马紫峰廖小珍
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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