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All-solid sodium secondary battery electrolyte and preparation method and application thereof

A sodium secondary battery and all-solid-state technology, applied in the field of electrolytes, can solve problems such as the unsatisfactory performance of all-solid-state sodium batteries at room temperature

Active Publication Date: 2018-10-23
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

However, the performance of the reported room-temperature all-solid-state sodium batteries based on sulfide electrolytes is still unsatisfactory.

Method used

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preparation example Construction

[0068] The present invention provides a method for preparing an electrolyte for an all-solid sodium secondary battery described in the above technical solution, comprising the following steps:

[0069] The first component, the second component are mixed with a solvent and reacted to obtain a precursor solution; the first component is selected from Na 2 S and / or Na 2 Se; the second component is selected from Sb 2 S 3 , Sb 2 Se 3 , Sb 2 S 5 , Sb 2 Se 5 ,P 2 S 5 ,P 2 S 3 、As 2 S 3 、As 2 S 5 , S, Se, SnS 2 、SiS 2 , SnS, GeS 2 and one or more of GeS;

[0070] The precursor solution is dried, ground, and heat-treated in a protective atmosphere to obtain an all-solid sodium secondary battery electrolyte, and the particle size of the all-solid sodium secondary battery electrolyte is 10 nm to 10 μm.

[0071] In the present invention, the first component, the second component and the solvent are mixed and reacted to obtain a precursor solution. The types of the firs...

Embodiment 1

[0086] Under the protection of argon atmosphere, (1) Na 2 S, Sb 2 S 3 and S in a molar ratio of 3:1:2, mixed with 20ml of solvent acetonitrile, and reacted at 50°C for 36h to obtain an all-solid-state sodium secondary battery electrolyte material Na 3 Sb 4 (2) the precursor solution obtained in step 1) is suction-filtered and dried to obtain an all-solid-state sodium secondary battery electrolyte material precursor; (3) the precursor obtained in step 2) is passed through high-energy ball milling for 24h Obtain the precursor powder; (4) anneal the precursor powder obtained in step 3) at 480°C for 12h to obtain the all-solid sodium secondary battery electrolyte material Na 3 Sb 4 . Scanning electron microscope test result shows that the Na prepared by embodiment 1 3 Sb 4 The particle size is from 10nm to 200nm. Under room temperature conditions, electrochemical impedance spectroscopy (EIS) test (with carbon sheet as blocking electrode) and cyclic voltammetry test (with m...

Embodiment 2

[0088] Under the protection of argon atmosphere, (1) Na 2 S, Sb 2 S 3 Mix Se with 20ml of solvent ethylene glycol dimethyl ether at a molar ratio of 3:1:2, and react at 25°C for 48h to obtain an all-solid-state sodium secondary battery electrolyte material Na 3 Sb 3 The precursor solution of Se; (2) the precursor solution obtained in step 1) is suction-filtered and dried to obtain the electrolyte material precursor of an all-solid-state sodium secondary battery; (3) the precursor obtained in step 2) is passed through high-energy ball milling 4h to obtain the precursor powder; (4) anneal the precursor powder obtained in step 3) at 500°C for 2h to obtain the all-solid sodium secondary battery electrolyte material Na 3 Sb 3 Se. Scanning electron microscopy (SEM) test structure shows that the Na prepared in embodiment 2 3 Sb 3 The particle size of Se is 30nm-500nm. Under room temperature conditions, electrochemical impedance spectroscopy (EIS) test (with carbon sheet as bl...

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Abstract

The invention provides an all-solid sodium secondary battery electrolyte and a method and application thereof. The all-solid sodium secondary battery electrolyte is prepared from a first component anda second component, wherein the first component is selected from Na2S (sodium sulfide) and / or Na2Se (disodium selenide); the second component is selected from one or multiple of Sb2S3 (antimony trisulfide), Sb2Se3 (antimony triselenide), Sb2S5 (antimony pentasulfide), Sb2Se5 (antimony pentaselenide), P2S5 (phosphorus pentasulfide), P2S3 (phosphorus trisulfide), As2S3 (arsenic trisulfide), As2S5 (arsenic pentasulfide), S (sulfur), Se (selenide), SnS2 (selenide disulfide), SiS2 (silicon disulfide), SnS (selenide sulfur), GeS2 (germanium disulfide) and GeS (germanium sulfide); the granularity ofthe all-solid sodium secondary battery electrolyte is 10nm to 10mum; the raw materials also comprise doping matters, and the doping matters are selected from one or multiple of a third component, oxide and halide; the third component and the second component are different. The all-solid sodium secondary battery electrolyte has the advantages that the sodium ion conductivity is higher in an all-solid sodium secondary battery; the electrochemical window is broader; the all-solid sodium secondary battery prepared by the electrolyte has good rate and cycle properties.

Description

technical field [0001] The invention belongs to the technical field of electrolytes, and in particular relates to an electrolyte for an all-solid sodium secondary battery, a preparation method and an application thereof. Background technique [0002] Lithium secondary batteries have the advantages of high energy density, high working voltage, and long cycle life, and are widely used in large-scale energy storage. However, with the development of large-scale consumer electronics and electric vehicles, the dependence on lithium secondary batteries has intensified, and the shortage of lithium resources has become an obstacle to the development of large-scale application of lithium secondary batteries. Sodium secondary batteries use low-cost, abundant reserves of metal sodium as the negative electrode. Its electrochemical working mechanism is similar to that of lithium secondary batteries, and the potential of sodium secondary batteries is only 0.3V higher than that of lithium s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/054
CPCH01M10/054H01M10/0562Y02E60/10
Inventor 姚霞银万红利刘高瞻
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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