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A kind of pyrophosphate composite electrolyte and preparation method thereof

A composite electrolyte and pyrophosphate technology, applied in the field of solid fuel cell materials, can solve problems such as difficulty in meeting the use requirements of solid fuel cells, discontinuous conduction of conductive ions, decreased electrical conductivity, etc., and achieve good electrochemical performance and enhanced mechanical strength. , easy to achieve effect

Active Publication Date: 2022-04-12
FUYANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other studies, Sn 1-x sc x P 2 o 7 A series of electrolyte samples, among which, Sn 0.94 sc 0.06 P 2 o 7 samples in wet H 2 In the atmosphere, at 200°C, the conductivity reaches a maximum value of 2.8×10 -2 S cm -1 (J.Power Sources,2011,196:683-687.) These series of samples conform to the Arrhenius relationship in the range of room temperature to 200°C, and the temperature continues to rise. Due to inherent defects such as stability and compactness, the conductivity Instead fall
[0005] In addition, indium-doped single pyrophosphate Sn 1-X In X P 2 o 7 After heat treatment at 1000°C, due to the lack of pyrophosphate in the system, the conductive ion conduction is discontinuous and the conductivity is low, which is difficult to meet the requirements of solid fuel cells (SolidState Ion., 2011(183): 26-31; Solid State Ion.,2009(180):148-153.)

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  • A kind of pyrophosphate composite electrolyte and preparation method thereof
  • A kind of pyrophosphate composite electrolyte and preparation method thereof
  • A kind of pyrophosphate composite electrolyte and preparation method thereof

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preparation example Construction

[0038] According to another object of the present invention, a method for preparing the above-mentioned composite electrolyte is provided, the method comprising the following steps:

[0039]Step 1. Mix pyrophosphate metal source, dopant atom source, concentrated phosphoric acid and metal inorganic salt, heat treatment to obtain cured product.

[0040] The pyrophosphate metal source is selected from tetravalent metals, such as tin, titanium, germanium, zirconium, preferably tin or titanium, more preferably tin. In order to ensure the conductivity of the electrolyte, the high-temperature fuel cell must be operated at a high temperature (900-1000 ° C), so that the requirements for each component of the battery are very strict, and the cost is high. In order to reduce the operating temperature and cost, the electrolyte needs to be at a medium temperature ( (400-750°C) has excellent electrical conductivity, which can reduce the production cost while ensuring the electrical conducti...

Embodiment 1

[0079] SnO 2 , Ni(NO 3 ) 2 , 14.6mol / L concentrated H 3 PO 4 with K 2 CO 3 According to the molar ratio of 2.7:0.3:7:0.5, the SnO 2 , Ni(NO 3 ) 2 and K 2 CO 3 for pre-grinding, followed by the addition of concentrated H 3 PO 4 Grinding (final molar ratio of Sn 0.9 Ni 0.1 P 2 o 7 : KPO 3 =3:1), mix well, and completely solidify after being kept at 350°C for 30 minutes to obtain a cured product.

[0080] Put the cured product in a box-type resistance furnace and heat it at 500°C for about 1 hour. After cooling to room temperature, take it out, grind it into a fine powder, and grind it evenly to obtain a composite powder.

Embodiment 2

[0082] Under the pressure of 200MPa, the composite powder was pressed into tablets for 3 minutes.

[0083] Put the pressed disc on the gasket, cover the ceramic crucible, and burn it in an electric furnace at 700°C for 1 hour to obtain Sn 0.9 Ni 0.1 P 2 o 7 / KPO 3 , where Sn 0.9 Ni 0.1 P 2 o 7 with KPO 3 The molar ratio is 3:1.

[0084] The sample was processed into an electrolyte diaphragm with a diameter of 18.0 mm and a thickness of 1.1 mm, which was used for testing the electrical performance at medium temperature in a dry nitrogen atmosphere.

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Abstract

The invention provides an inorganic compound electrolyte, which is compounded by doped pyrophosphate and metaphosphate. The composite electrolyte obtained by compounding doped pyrophosphate and metaphosphate has good medium-temperature conductivity. In the dual chemical atmosphere of cathode and anode, it has high ionic conductivity and negligible electronic conductivity, and can be used for a long time. Time is stable. The composite electrolyte has good compactness and can form a dense film to ensure that gas permeation does not occur at operating and working temperatures. The composite electrolyte in the invention has good mechanical strength and toughness, can meet the use requirements of solid fuel cells, is easy to process, and has low preparation cost.

Description

technical field [0001] The invention relates to the field of solid fuel cell materials, in particular to a pyrophosphate and pyrophosphate composite electrolyte and a preparation method thereof. Background technique [0002] Compared with high-temperature and low-temperature fuel cells, medium-temperature fuel cells have a wider range of options in terms of sealing materials, connecting materials, and electrolyte materials. Among them, the development of electrolyte materials with high conductivity at medium temperature has become a research hotspot for medium temperature fuel cells. [0003] Since 2006, a new intermediate temperature proton conductor pyrophosphate MP 2 o 7 (M is Sn, Ti, Ce or Si) In a non-humidified air atmosphere, the proton conductivity is 10 in the range of 50 to 300°C -3 ~10 -1 S cm -1 , has aroused extensive attention of researchers. The liquid-phase synthesis method was adopted in the research, using H 3 PO 4 Reaction with tin dioxide to gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/10C04B35/447C04B35/622C04B35/626H01M8/1016
CPCC04B35/447C04B35/622C04B35/62675H01M8/1016H01M2300/0088H01M2300/0071C04B2235/3279C04B2235/3284C04B2235/3201C04B2235/447C04B2235/602C04B2235/656C04B2235/6567C04B2235/95Y02E60/50
Inventor 王洪涛韩燕
Owner FUYANG NORMAL UNIVERSITY