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Lithium ion solid electrolyte with core-shell structure and preparation method

A technology of solid electrolyte and core-shell structure, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of unsatisfactory conductivity and narrow electrochemical window, and achieve cycle life without pollution, high energy density, Effect of preventing electrolyte leakage

Inactive Publication Date: 2021-03-30
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] According to the above, the research on inorganic solid electrolytes for lithium batteries in the existing schemes mainly focuses on LISICON (lithium zinc germanate) structure, NASICON (Na Superionic Conductor, sodium superionic conductor) structure, perovskite structure, Crystalline lithium ion solid electrolytes with garnet structure and oxide, sulfide, oxide and sulfide mixed glass lithium ion solid electrolytes. However, the existing stepless solid electrolytes generally have narrow electrochemical windows and unsatisfactory electrical conductivity. defects, the present invention proposes a lithium-ion solid-state electrolyte with a core-shell structure and a preparation method, which can effectively solve the above-mentioned technical problems

Method used

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Embodiment 1

[0039] (1) Put Li first 2 CO 3 、Al 2 o 3 、TiO 2 and NH 4 h 2 PO 4 , mixed evenly, then added to an alumina crucible, calcined in a muffle furnace I, and then naturally cooled to room temperature to obtain a core material powder, and finally the powder was ground and sieved to obtain a core layer powder; the calcined temperature was 780℃, the time is 5h; the core material powder is Li 1.1 al 0.1 Ti 1.9 (PO 4 ) 3 ; The mesh number of sieving is 800 mesh;

[0040] The ratio of each raw material is, by mole, Li 2 CO 3 1.1 moles, Al 2 o 3 0.1 mole, TiO 2 3.8 moles, NH 4 h 2 PO 4 6 moles;

[0041] (2) LiOH·H 2 O, H 3 BO 3 , NH 4 h 2 PO 4 and NH 4 Add F into deionized water, then stir until fully dissolved, then use ammonia water to adjust the pH value, and react to obtain Li 0.15 B 0.95 (PO 4 ) 0.9 f 0.3 Precursor, then add silica sol, and finally mechanically stir to obtain the sol; adjust the pH value to 8.5; the silica sol is alkaline silica so...

Embodiment 2

[0048] (1) Put Li first 2 CO 3 、Al 2 o 3 、TiO 2 and NH 4 h 2 PO 4 , mixed evenly, then added to an alumina crucible, calcined in a muffle furnace, and then naturally cooled to room temperature to obtain a core material powder, and finally the powder was ground and sieved to obtain a core layer powder; the calcined temperature was 750 ℃, the time is 5.5h; the core material powder is Li 1.1 al 0.1 Ti 1.9 (PO 4 ) 3 ; The mesh number of sieving is 900 mesh;

[0049] The ratio of each raw material is, by mole, Li 2 CO 3 1.1 moles, Al 2 o 3 0.1 mole, TiO 2 3.8 moles, NH 4 h 2 PO 4 6 moles;

[0050] (2) LiOH·H 2 O, H 3 BO 3 , NH 4 h 2 PO 4 and NH 4 Add F into deionized water, then stir until fully dissolved, then use ammonia water to adjust the pH value, and react to obtain Li 0.15 B 0.95 (PO 4 ) 0.9 f 0.3 Precursor, then add silica sol, and finally mechanically stir to obtain sol; adjust pH to 8; silica sol is alkaline silica sol with a solid cont...

Embodiment 3

[0056] (1) Put Li first 2 CO 3 、Al 2 o 3 、TiO 2 and NH 4 h 2 PO 4 , mixed evenly, then added to an alumina crucible, calcined in a muffle furnace, and then naturally cooled to room temperature to obtain a core material powder, and finally the powder was ground and sieved to obtain a core layer powder; the calcining temperature was 850 ℃, the time is 4.5h; the core material powder is Li 1.1 al 0.1 Ti 1.9 (PO 4 ) 3 ; The mesh number of sieving is 900 mesh;

[0057] The ratio of each raw material is, by mole, Li 2 CO 3 1.1 moles, Al 2 o 3 0.1 mole, TiO 2 3.8 moles, NH 4 h 2 PO 4 6 moles;

[0058] (2) LiOH·H 2 O, H 3 BO 3 , NH 4 h 2 PO 4 and NH 4 Add F into deionized water, then stir until fully dissolved, then use ammonia water to adjust the pH value, and react to obtain Li 0.15 B 0.95 (PO 4 ) 0.9 f 0.3 Precursor, then add silica sol, and finally mechanically stir to obtain the sol; adjust the pH value to 8; the silica sol is alkaline silica so...

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Abstract

The invention relates to the field of lithium batteries, and discloses a lithium ion solid electrolyte with a core-shell structure and a preparation method. The preparation method comprises the following steps of (1) mixing Li2CO3, Al2O3, TiO2 and NH4H2PO4, calcining, cooling, grinding and sieving to obtain core layer powder; (2) adding LiOH H2O, H3BO3, NH4H2PO4 and NH4F into deionized water, uniformly stirring, adjusting the pH value, adding silica sol, and mechanically stirring to obtain sol; and (3) adding the core layer powder and Al (H2PO4) 3 into the sol, carrying out spray drying, sintering the obtained precursor material, cooling, grinding, washing, and drying to obtain the lithium ion solid electrolyte with the core-shell structure. Compared with a common inorganic solid electrolyte, the inorganic solid electrolyte with the core-shell structure has the advantages that a complete and compact electron shielding layer is formed on the surface of a base material, so that an electrochemical window is wide, the ionic conductivity is high, and the application prospect is good.

Description

technical field [0001] The invention relates to the field of lithium batteries, and discloses a lithium-ion solid electrolyte with a core-shell structure and a preparation method. Background technique [0002] In recent years, the rapid development of the field of new energy power generation has put forward new requirements for the matching energy storage system. In the replacement of energy storage batteries, lithium-ion batteries have become a key research field due to their various advantages, and have been practically applied in a large number of energy storage projects and achieved certain results. With the development of high technology, lithium-ion batteries have been widely used in electric vehicles, smart phones, energy storage and many other fields due to their advantages such as high working voltage, high energy density, no memory effect, long cycle life and no pollution. [0003] A lithium battery is mainly composed of a positive electrode, a negative electrode,...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0562H05K9/00
CPCH01M10/0562H01M10/058H01M2300/0094H05K9/0081Y02E60/10Y02P70/50
Inventor 廖健淞陈庆司文彬白涛
Owner CHENDU NEW KELI CHEM SCI CO LTD
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