NASICON structure sodium ion solid electrolyte, preparation method thereof, and solid state sodium ion battery

A technology of solid electrolyte and sodium ions, which can be used in the manufacture of non-aqueous electrolyte batteries, electrolyte batteries, electrolytes, etc., and can solve problems that limit the application of solid-state sodium batteries.

Active Publication Date: 2018-12-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Na with NASICON structure 1+x Zr 2 Si x P 3-x o 12 (0≤x≤3) The material has good stability, a wide electrochemical window, and is stable to metallic sodium at room temperature, and its ionic conductivity reaches 10 -4 On the order of S / cm, however, its ionic conductivity is still lower than that of liquid electrolytes, limiting its application in solid-state sodium batteries

Method used

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  • NASICON structure sodium ion solid electrolyte, preparation method thereof, and solid state sodium ion battery
  • NASICON structure sodium ion solid electrolyte, preparation method thereof, and solid state sodium ion battery
  • NASICON structure sodium ion solid electrolyte, preparation method thereof, and solid state sodium ion battery

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Experimental program
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Effect test

Embodiment 1

[0141] Preparation of Na by solid phase method 3.1 [Zr 1.95 Mg 0.05 ]Si 2 PO 12 solid electrolyte material.

[0142] According to the molar ratio of Na source, P source, Zr source, Si source and metal oxide is 1.55:1:1.95:2:0.05, 0.0155mol Na 2 CO 3 , 0.01mol NH 4 h 2 PO 4 , 0.0195mol ZrO 2 , 0.02mol SiO 2 Mix with 0.0005mol MgO, ball mill evenly and dry. The obtained mixture was placed in a muffle furnace, heated to 900° C. for 6 hours in an air atmosphere, cooled and then ball-milled and dried to obtain a precursor powder. The precursor powder was pressed into tablets, then placed in a muffle furnace, and heat-treated at 1225 °C for 12 hours in an air atmosphere to obtain a sheet-shaped NASICON structure sodium ion solid electrolyte sample.

[0143] The obtained flake NASICON structure sodium ion solid electrolyte sample is subjected to scanning electron microscope scanning analysis, and the results are as follows: figure 1 as shown, figure 1 Cross-sectional SE...

Embodiment 2

[0150] Preparation of Na by solid phase method 3.2 [Zr 1.9 Mg 0.1 ]Si 2 PO 12 solid electrolyte material.

[0151] According to the molar ratio of Na source, P source, Zr source, Si source and metal oxide as 1.92:1:1.9:2:0.1, 0.0192molNa 2 CO 3 , 0.01mol (NH 4 ) 2 HPO 4 , 0.019molZrO 2 , 0.02mol SiO 2 Mix with 0.001mol MgO, ball mill evenly and dry. The obtained mixture was placed in a muffle furnace, heated to 950° C. for 6 hours in an air atmosphere, cooled and then ball-milled and dried to obtain a precursor powder. The precursor powder was pressed into tablets, then placed in a muffle furnace, and heat-treated at 1225 °C for 12 hours in an air atmosphere to obtain a sheet-shaped NASICON structure sodium ion solid electrolyte sample.

[0152] The flaky NASICON structure sodium ion solid electrolyte is polished, cleaned, and dried, and then gold is sputtered on both sides of the dried electrolyte as a blocking electrode, and an AC impedance test is performed at r...

Embodiment 3

[0157] Preparation of Na by solid phase method 3.4 [Zr 1.9 Mg 0.1 ] Si 2.2 P 0.8 o 12 solid electrolyte material.

[0158] According to the molar ratio of Na source, P source, Zr source, Si source and metal oxide is 3.4:0.88:1.9:2.2:0.1, 0.034mol NaHCO 3 , 0.0088mol H 3 PO 4 , 0.019mol ZrO 2 , 0.022mol SiO 2 Mix with 0.001mol MgO, ball mill evenly and dry. The obtained mixture was placed in a muffle furnace, heated to 850° C. for 10 h in an air atmosphere, cooled and then ball-milled and dried to obtain a precursor powder. The precursor powder was pressed into tablets, then placed in a muffle furnace, and heat-treated at 1275 °C for 8 hours in an air atmosphere to obtain a sheet-shaped NASICON structure sodium ion solid electrolyte sample.

[0159] The obtained flake NASICON structure sodium ion solid electrolyte sample is subjected to scanning electron microscope scanning analysis, and the results are as follows: Figure 5 as shown, Figure 5 Cross-sectional SEM ...

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Abstract

The invention provides an NASICON structure sodium ion solid electrolyte. The NASICON structure sodium ion solid electrolyte has a general formula represented by formula (I); and in the formula (I), A<II> is a Zr position-doped substituted divalent metal element, A<III> is a Zr position-doped substituted trivalent metal element, A<IV> is a Zr position-doped substituted tetravalent metal element, A<V> is a Zr position-doped substituted pentavalent metal element, B<IV> is a P position-doped substituted tetravalent metal element, a, b, c, d, e and f are mole percentages of corresponding elementsrespectively, a is not less than 0 and not more than 1, b is not less than 0 and not more than 1, c is not less than 0 and not more than 1, d is not less than 0 and not more than 1, e is not less than0 and not more than 2.2, f is not less than 0 and not more than 1, and a, b, c, d and f are not zero simultaneously. The NASICON structure sodium ion solid electrolyte has a high room-temperature ionconductivity, and the solid state sodium ion battery prepared from the electrolyte has a good cycle stability.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte materials, in particular to a NASICON structure sodium ion solid electrolyte, a preparation method thereof and a solid sodium ion battery. Background technique [0002] Energy is the basic condition for human survival and an important pillar for the development of the world economy. At present, the energy crisis and environmental pollution have become prominent problems restricting the sustainable development of the world and urgently need to be resolved. In order to alleviate the current situation of environmental degradation and change the existing irrational energy structure, the development and storage of new green and clean energy has become an urgent task. Due to the volatility and intermittency of green and clean energy such as solar energy, wind energy, and tidal energy, direct input to the grid will have an impact on the entire grid system, so they cannot be directly integrated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/054H01M10/058
CPCH01M10/054H01M10/0562H01M10/058H01M2300/0071Y02E60/10Y02P70/50
Inventor 姚霞银杨菁刘高瞻万红利
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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