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Electrolyte solution, sodion secondary battery and preparation method thereof

A secondary battery and electrolyte technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low capacity and poor rate performance of dual-ion batteries, improve environmental compatibility, improve Energy density, cost reduction effect

Active Publication Date: 2018-06-15
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a novel electrolyte to improve the technical problems of low capacity and poor rate performance of existing sodium-ion dual-ion batteries

Method used

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  • Electrolyte solution, sodion secondary battery and preparation method thereof
  • Electrolyte solution, sodion secondary battery and preparation method thereof
  • Electrolyte solution, sodion secondary battery and preparation method thereof

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preparation example Construction

[0100] According to the third aspect of the present invention, the present invention provides a method for preparing a sodium-ion secondary battery, comprising the following steps: assembling a positive electrode, an electrolyte, a separator, and a negative electrode to obtain a sodium-ion secondary battery.

[0101] The preparation method of the sodium ion secondary battery provided by the present invention has simple process, convenient operation, and can save a lot of manpower and material resources.

[0102] In a preferred embodiment of the present invention, the electrolyte is prepared according to the following steps:

[0103] Add two or more sodium salts of different anions into the corresponding solvent according to a certain proportion, stir and dissolve to obtain the electrolyte.

[0104] In a preferred embodiment of the present invention, the negative electrode is prepared according to the following steps:

[0105] First, weigh the appropriate negative electrode ac...

Embodiment 1

[0111] figure 1 A schematic structural view of the sodium ion secondary battery provided in Example 1 of the present invention, such as figure 1 As shown, this embodiment provides a sodium ion secondary battery, including a negative electrode, a separator 4, an electrolyte 3 and a positive electrode 1, the negative electrode is prepared by coating the negative electrode material 2 on the negative electrode current collector 1, and the positive electrode is prepared by the positive electrode material 5 is prepared by coating on the positive electrode current collector.

[0112] The preparation method of the sodium ion secondary battery provided in this embodiment comprises the following steps:

[0113] (1) Preparation of positive electrode: Add 0.8g of expanded graphite, 0.1g of carbon black, and 0.1g of polyvinylidene fluoride into 2ml of nitrogen-methylpyrrolidone solution, thoroughly grind to obtain a uniform slurry; then evenly coat the slurry on the surface of aluminum fo...

Embodiment 2-15

[0119] Embodiment 2-15 provides a kind of sodium ion secondary battery respectively, and it all adopts the negative electrode identical with embodiment 1, glass fiber diaphragm, identical electrolyte solvent ratio, identical solute molar concentration (1mol / L) and The positive electrode active material differs in the molar ratio of the sodium salts of the two anions added.

[0120] The sodium-ion secondary battery provided by embodiment 1 and embodiment 2-15 is tested for electrochemical performance, including number of cycles, capacity retention and coulombic efficiency, and the test method is as follows:

[0121] Cycle charge and discharge: cycle charge and discharge are carried out on CT2001C-001 blue electric battery cycle test system, and the standard capacity of the electrode is tested by charging and discharging at a rate of 100mA / g. The specific capacity of the material = current * time / sample mass, the energy density of the material = specific capacity of the materi...

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Abstract

The invention provides an electrolyte solution, a sodion secondary battery and a preparation method thereof, which belong to the technical field of a battery. The electrolyte solution comprises an electrolyte and a solvent, and the electrolyte comprises at least two different anion sodium salts; and the sodion secondary battery comprises an anode, a cathode, a diaphragm and the electrolyte solution provided in the invention; so that the technical problems of low capacity of the current sodion dual-ion batteries and poor multiplying power can be improved. The sodion secondary battery can increase the energy density of the sodion dual-ion battery and improve the multiplying power performance, easily available sodion with low cost can be taken as a main body for an electrochemical reaction, environment compatibility of the battery is obviously increased, and the cost of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte solution, a sodium ion secondary battery and a preparation method thereof. Background technique [0002] A secondary battery, also known as a rechargeable battery, is a battery that can be repeatedly charged and discharged and used many times. Compared with non-reusable primary batteries, secondary batteries have the advantages of low cost and less environmental pollution. Among the main secondary battery technologies at present, lithium-ion batteries are the most widely used, and daily-used mobile phones, notebook computers, digital cameras, etc. all use lithium-ion batteries as power sources. The core components of a lithium-ion battery usually include a positive electrode, a negative electrode, and an electrolyte. It realizes electrical energy storage and release through a redox reaction that separates ion transport and electron transport at the interface of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0569H01M10/054H01M10/058
CPCH01M10/054H01M10/0568H01M10/0569H01M10/058Y02E60/10Y02P70/50
Inventor 唐永炳张苗
Owner SHENZHEN INST OF ADVANCED TECH
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