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Porous-compact double-layer electrolyte ceramic sintered body, lithium ion battery and lithium-air battery

A lithium ion and electrolyte technology, which is applied in the field of all-solid lithium ion battery and lithium-air battery manufacturing, can solve safety problems and other problems, and achieve the effect of solving liquid leakage and simple preparation process

Active Publication Date: 2015-09-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is the current commercial secondary lithium-ion battery or the lithium-air battery under research, the organic electrolyte mainly used is still the main cause of safety problems.
At the same time, for some special occasions, such as providing energy for highly integrated small electronic products, or realizing stable energy storage in a wide temperature range, the existing ion battery technology has been severely challenged.

Method used

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  • Porous-compact double-layer electrolyte ceramic sintered body, lithium ion battery and lithium-air battery
  • Porous-compact double-layer electrolyte ceramic sintered body, lithium ion battery and lithium-air battery
  • Porous-compact double-layer electrolyte ceramic sintered body, lithium ion battery and lithium-air battery

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preparation example Construction

[0032] A method for preparing a porous-dense double-layer electrolyte ceramic sintered body based on an inorganic solid-state lithium-ion electrolyte material according to an embodiment of the present invention includes the following steps:

[0033] a) Provide powder of inorganic solid lithium ion electrolyte material

[0034] Among them, the inorganic solid-state lithium ion electrolyte material can be preferably, but not limited to, lithium lanthanum zirconium oxide with a cubic garnet structure (the chemical formula can be written as Li 7 La 3 Zr 2 o 12 )-based electrolyte material, NASICON type lithium-ion electrolyte Li 1+x A x m 2-x (Si y P 1-y o 4 ) 3 (A=Al 3+ , Ga 3+ ,Sc 3+ ,Y 3+ , or Cr 3+ ; M = Ti 4+ , Ge 4+ ,Hf 4+ or Zr 4+ ), perovskite electrolyte Li 3x La 2 / 3-x□1 / 3-2x TiO 3 (Wherein, □ represents A-site atomic vacancy, 0.06<x<0.15) and so on.

[0035]Preferably, lithium-lanthanum-zirconium-based electrolytes, such as Li 6.75 La 3 Zr 1.75 T...

Embodiment 1

[0083] Example 1 Preparation of porous-dense double-layer electrolyte ceramic sintered body based on inorganic solid lithium ion electrolyte material

[0084] The powder of the electrolyte material is Li 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , the powder preparation process refers to the method recorded in the above literature [1]. In the preparation of the powder, LiOH·H 2 O.

[0085] Mix a part of the above-mentioned powder with the graphite pore-forming agent uniformly at a mass ratio of 1:1 to obtain a mixed powder.

[0086]Thereafter, the mixed powder is combined with the powder not containing the pore-forming agent by lamination to form a green body.

[0087] Next, the green body is embedded in the sacrificial powder composed of mother powder, sintered at 1100°C for 4 hours, taken out, and the excess sacrificial powder on the surface is removed to obtain a porous-dense double-layer ceramic sintered body.

[0088] Figure 1 shows the schematic structure of the porous-doubl...

Embodiment 2

[0090] Example 2 Preparation of all-solid-state secondary lithium-ion battery

[0091] As an all-solid-state secondary lithium-ion battery, the positive electrode active material is LiCoO 2 .

[0092] As the introduction method of the positive electrode active material, the nitrates of Li and Co were dissolved in deionized water, and citric acid was added to make LiCoO 2 sol precursors. The precursor is injected into the porous layer of the double-layer structure prepared in Example 1, and heat-treated at 600 ° C for 1 hour to convert it into LiCoO 2 , and after heat treatment, the positive electrode active material is tightly bonded to the inner wall of the porous layer, which is conducive to the conduction of electrons during the charging and discharging process.

[0093] Thereafter, as the negative electrode, the metal lithium sheet is heated and melted, and combined with one side of the dense layer of the double-layer structure, that is, an all-solid-state secondary lit...

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Abstract

The invention discloses a porous-compact double-layer electrolyte ceramic sintered body based on inorganic solid state lithium ion electrolyte materials, an all-solid-state secondary lithium ion battery, an all-solid-state secondary lithium-air battery, and preparation methods. The preparation method for the sintered body comprises the following steps: first, powder of inorganic solid state lithium ion electrolyte materials is provided; second, part of the powder and pore forming agents are mixed, and mixed powder is obtained; third, the other part of the powder and the mixed powder form a green body, the green body comprises a first green body layer and a second green body layer which are stacked mutually, the other part of the powder forms the first green body layer and the mixed powder forms the second green body layer; fourth, the green body is subjected to sintering, the pore forming agents are burnt off, the porous-compact double-layer electrolyte ceramic sintered body is obtained, the first green body layer forms a compact layer and the second green body forms a porous layer.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to an all-solid-state lithium-ion battery and a technical method for manufacturing a lithium-air battery. Background technique [0002] Among the currently commercialized chemical energy storage batteries, secondary lithium-ion batteries have the highest theoretical specific energy, and are widely used as power sources for information equipment and communication devices such as personal computers, cameras, and mobile phones. The popularization of electric vehicles and the development of large-scale energy storage fields such as grid energy storage have put forward stricter requirements on the energy density and safety of secondary lithium-ion batteries. In addition, secondary lithium-air batteries have the highest specific energy among the currently known chemical energy storage methods, so their applications in the above fields have also attracted much attention. However, whethe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/0525H01M12/08
CPCH01M10/0525H01M10/0562H01M10/058H01M12/08Y02E60/10Y02P70/50
Inventor 任耀宇南策文
Owner TSINGHUA UNIV
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