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Sodium ion secondary battery and non-aqueous electrolyte therefor

A non-aqueous electrolyte, secondary battery technology, applied in the field of materials, can solve the problems of corrosion current generation, narrow electrochemical window, limited application, etc., to achieve the effect of improving working voltage, inhibiting corrosion, improving performance and life

Inactive Publication Date: 2017-07-18
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the application of bisfluorosulfonimide sodium electrolyte in the positive electrode shows that its electrochemical window is narrow, and it starts to corrode aluminum foil at about 3.8V, resulting in corrosion current
This will severely limit its application as high voltage is our way to increase energy density and specific capacity

Method used

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  • Sodium ion secondary battery and non-aqueous electrolyte therefor
  • Sodium ion secondary battery and non-aqueous electrolyte therefor
  • Sodium ion secondary battery and non-aqueous electrolyte therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present embodiment prepares non-aqueous electrolyte according to the following steps:

[0034] At room temperature, in a glove box, mix dimethyl carbonate and ethylene carbonate solvents, then add sodium bisfluorosulfonyl imide, then add functional additives, and stir evenly to obtain a non-aqueous electrolyte.

[0035] Through the above steps, 9 kinds of non-aqueous electrolyte solutions 1-9 in Table 1 were prepared by using different contents of different functional additives.

[0036] Table 1. Components and various contents of non-aqueous electrolytes.

[0037]

Embodiment 2

[0039] The positive electrode is made of aluminum foil cut to a diameter of 14 mm, and the negative electrode is made of a metal sodium sheet with a diameter of 10 mm. The electrolytes 1-9 prepared in Example 1 and the control electrolyte are respectively added to assemble button-type secondary batteries 1A-1I and control 2 Secondary battery 1.

[0040] The assembled secondary batteries 1A-1I and the control secondary battery 1 were subjected to a cyclic voltammetry test, wherein the voltage range was 2.5-4.2V. The cyclic voltammetry curves of secondary battery 1A-1I and contrast secondary battery 1 are respectively as follows Figures 1A-1I and figure 2 displayed.

[0041] After the cyclic voltammetry test for 25 weeks, the secondary batteries 1A-1I and the control secondary battery 1 were disassembled in the glove box, and the aluminum foil was taken out, cleaned with dimethyl carbonate, dried in a vacuum transition chamber, and then scanned. Observe the corrosion situati...

Embodiment 3

[0045] 70mg sodium ion secondary battery cathode material (Na 0.9 Ni 0.4 mn0.4 Ti 0.2 o 2 ) as an active substance, mixed with 20mg carbon black and 200μL polyvinylidene fluoride (PVDF) in N,N-dimethylpyrrolidone (NMP) solution (concentration: 50mg / mL) to form a slurry, and coated on the current collector aluminum foil , dried at 120°C to make electrode sheets. Put the dried electrode sheet into an argon glove box, assemble a battery with a sodium sheet with a diameter of 10mm as the negative electrode, and add the electrolytes 1-9 prepared in Example 1 and the control electrolyte respectively to completely infiltrate the electrode sheet , were assembled into experimental secondary batteries, labeled as secondary batteries 2A-2I and control secondary battery 2, respectively.

[0046] Charge and discharge tests were performed on the secondary batteries 2A-2I and the control secondary battery 2 at a rate of 0.2C, respectively. The charge cut-off voltage is 4V, the discharge...

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Abstract

The invention discloses a non-aqueous electrolyte for a sodium ion secondary battery and with a function of restraining aluminum foil corrosion of a positive electrode current collector. The non-aqueous electrolyte comprises sodium bis(fluorosulfonyl)imide, a functional additive sodium perchlorate and / or sodium hexafiuorophosphate. The invention also discloses the sodium ion secondary battery comprising the non-aqueous electrolyte, and a preparation method and an application of the sodium ion secondary battery.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a nonaqueous electrolyte solution for a sodium ion secondary battery that inhibits corrosion of an aluminum foil of a positive electrode collector, a sodium ion secondary battery containing the nonaqueous electrolyte solution, and a preparation method and application thereof. Background technique [0002] Since 1991, Japan's Sony Corporation has successfully used carbon materials as negative electrodes, LiCoO 2 After the commercialization of lithium-ion batteries with positive electrodes, lithium-ion batteries have revolutionized the face of consumer electronics due to their high energy density, high average output voltage, low self-discharge, excellent cycle performance, and environmental protection. So far, it still occupies the market of portable electronic devices, and is gradually being pushed to the field of electric vehicles and large-scale energy storage systems. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M10/0567
CPCH01M10/054H01M10/0567H01M2220/10H01M2220/20H01M2300/0025Y02E60/10
Inventor 胡勇胜戚兴国马强刘丽露李泓陈瀚林陈立泉黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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