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Sodium ion solid electrolyte and preparation method thereof

A solid electrolyte and sodium ion technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems that hinder the practical application of all solid-state batteries and unstable electrochemical properties, and achieve excellent thermodynamic stability and good electrical stability. Chemical compatibility, effect of high sodium ion conductivity

Active Publication Date: 2019-04-26
ZHENGZHOU NEW CENTURY MATERIALS GENOME INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical properties of this material are unstable when in contact with metal Na, which hinders its practical application in all-solid-state battery technology.

Method used

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  • Sodium ion solid electrolyte and preparation method thereof
  • Sodium ion solid electrolyte and preparation method thereof
  • Sodium ion solid electrolyte and preparation method thereof

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[0024] The preparation method of the sodium ion solid electrolyte provided by the invention comprises the following steps: according to the chemical composition of the sodium ion solid electrolyte, one or both of metal sulfate, metal selenate and metal halide are taken in a protective atmosphere After mixing, it is pressed into shape, then heat-preserved at 750-855°C for 8-12 hours, and then cooled.

[0025] Preferably, the temperature of the heat preservation treatment is 800-850°C. The time of the heat preservation treatment is 10h.

[0026] The technical solution of the present invention will be further described below in combination with specific embodiments.

Embodiment 1

[0028] The sodium ion solid electrolyte of the present embodiment, chemical composition is Na 3 SO 4 f 0.5 Cl 0.5 , see the structure diagram figure 1 .

[0029] The preparation method of the sodium ion solid electrolyte of the present embodiment comprises the following steps:

[0030] 1) The raw material sodium sulfate (Na 2 SO 4 ) powder, sodium chloride (NaCl) powder, and sodium fluoride (NaF) powder were dried in a vacuum oven for 24 hours;

[0031] Under the protection of argon atmosphere in the glove box, according to the molar ratio of sodium sulfate, sodium chloride and sodium fluoride is 2:1:1, take sodium sulfate powder, sodium chloride powder and sodium fluoride powder and mix them evenly before loading Put 15 zirconia ball milling balls with a diameter of 10mm into the ball milling jar, then take out the sealed ball milling jar from the glove box, put it into the omnidirectional planetary ball mill for ball milling, and set the ball mill speed to 300rpm, t...

Embodiment 2

[0034] The sodium ion solid electrolyte of the present embodiment, chemical composition is Na 3 SeO 4 f 0.5 Cl 0.5 , see the structure diagram figure 2 .

[0035] The preparation method of the sodium ion solid electrolyte of the present embodiment comprises the following steps:

[0036] 1) the raw material sodium selenate (Na 2 SeO 4 ) powder, sodium chloride (NaCl) powder, and sodium fluoride (NaF) powder were dried in a vacuum oven for 24 hours;

[0037] Under the protection of argon atmosphere in the glove box, take sodium selenate powder, sodium chloride powder and sodium fluoride powder and mix them evenly according to the molar ratio of sodium selenate, sodium chloride and sodium fluoride being 2:1:1 Finally, put it into the ball mill jar, put 15 zirconia ball milling balls with a diameter of 10mm into the ball mill jar, then take the sealed ball mill jar out of the glove box, put it into the omnidirectional planetary ball mill for ball milling, and set the ball ...

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Abstract

The invention relates to a sodium ion solid electrolyte and a preparation method thereof and belongs to the technical field of metal ion batteries. The chemical composition of the sodium ion solid electrolyte is NaaLibR(3-a-b) / 2ApB1-pXmY1-m, wherein R is selected from metal ions of +2 valence, A and B are independently selected from one of SO42- and SeO42-, X and Y are independently selected fromone of monovalent chloride ions and fluoride ions, , 2.45 <= a <= 3, 0 <= b <= 0.45, 0 <= (3-a-b) / 2 <= 0.05, 0 <= p <= 1, and 0 <= m <= 1. The sodium ion solid electrolyte has excellent sodium ion conductivity and thermodynamic stability, has three-dimensional equivalent ultrafast ion transmission capacity, lower diffusion activation energy and higher sodium ion conductivity, and a sodium ion battery electrode has good electrochemical compatibility.

Description

technical field [0001] The invention relates to a sodium ion solid electrolyte and a preparation method thereof, belonging to the technical field of metal ion batteries. Background technique [0002] The study of metal ion all-solid electrolytes to replace metal ion liquid organic electrolytes is expected to fundamentally solve the safety hazard of flammability in today's liquid electrolyte batteries. However, with the ionic conductivity of the liquid electrolyte as the standard (metal ion conductivity greater than 1mS cm -1 ), the rapid transport of metal ions in solid electrolytes remains extremely challenging. [0003] Types and important parameters of traditional oxide solid electrolytes, for sodium ion solid electrolytes, metal silicon phosphate Na 1+x Zr 2 Si x P 3-x o 12 (NZSP, 0≤x≤3) solid electrolyte with a maximum sodium ion conductivity of 0.1mS cm at 298K -1 . Na 3 V 2 (PO 4 ) 3 (NVP) The sodium ion conductivity at 25°C is 0.18mS·cm -1 . Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/054
CPCH01M10/054H01M10/0562H01M10/058Y02E60/10Y02P70/50
Inventor 邵国胜于玉然王卓
Owner ZHENGZHOU NEW CENTURY MATERIALS GENOME INST CO LTD
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