Inorganic/organic nano composite solid electrolyte and method of preparing the same

A solid electrolyte and nanocomposite technology, which is applied to batteries with solid electrolytes, solid electrolytes, electrolytes, etc., can solve the problems of reducing crystallinity, unable to meet lithium ion transport, thermal stability and mechanical properties need to be further improved, etc. The effect of good thermal stability, high room temperature conductivity and lithium ion migration number

Inactive Publication Date: 2008-10-01
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, unmodified pure PEO has the following disadvantages as a solid electrolyte: firstly, because it is a macromolecular polymer, the ion conductivity is low due to its high crystallinity, which cannot meet the needs of lithium ion transmission; secondly, as a pure organic matter, the material The thermal stability and mechanical properties need to be further improved
[0005] However, compounding hydrotalcite nanosheets LDHNS with conductive polymer PEO destroys the orderly arrangement of PEO crystals, reduces its crystallinity, and improves the thermal stability of PEO while increasing its ionic conductivity and lithium ion migration number. no relevant reports

Method used

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  • Inorganic/organic nano composite solid electrolyte and method of preparing the same
  • Inorganic/organic nano composite solid electrolyte and method of preparing the same
  • Inorganic/organic nano composite solid electrolyte and method of preparing the same

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Embodiment 1

[0025] The experimental water was used to remove CO from the freshly boiled 2 of secondary deionized water, reacted at N 2 under atmosphere. Weigh 10.24g of Mg(NO 3 ) 2 ·6H 2 O and 7.50g of Al(NO 3 ) 3 9H 2 O, dissolved in 120mL to remove CO 2 deionized water to make a 0.5mol / L mixed solution (Mg 2+ with Al 3+ The molar ratio is 2:1), added dropwise to 80mL of lactic acid (LA) solution with a concentration of 0.5mol / L (LA and Mg 2+ The molar ratio is 4:1). At the same time, 40 mL of NaOH solution (NaOH and Mg 2+ The molar ratio is 5:1), stirring to keep the pH=11, and the resulting slurry is crystallized in a closed container at 100° C. for 10 hours to obtain lactic acid intercalated hydrotalcite. Lactic acid intercalated hydrotalcite with deCO 2 Wash with deionized water, then centrifuge at a high speed of 10,000 rpm for 5 minutes, remove the supernatant, and precipitate the solid with deCO 2 Continue high-speed centrifugation after washing with deionized water,...

Embodiment 2

[0029] The experimental water was used to remove CO from the freshly boiled 2 of secondary deionized water, reacted at N 2 under atmosphere. Weigh 2.97g of Zn(NO 3 ) 2 ·6H 2 O and 1.875g of Al(NO 3 ) 3 9H 2 O dissolved in 150mL to remove CO 2 deionized water to prepare a mixed solution with a concentration of 0.1mol / L (Zn 2+ with Al 3+ molar ratio of 2:1), was added dropwise to 50 mL of lactic acid (LA) solution with a concentration of 0.4 mol / L (LA and Zn 2+ The molar ratio is 2:1). At the same time, 80 mL of NaOH solution with a concentration of 1.0 mol / L (NaOH and Mg 2+ The molar ratio is 8:1), stirring to keep the pH=12, and the obtained slurry is crystallized in a closed container at 40° C. for 4 hours to obtain lactic acid intercalated hydrotalcite. Lactic acid intercalated hydrotalcite with deCO 2 Wash with deionized water, then centrifuge at a high speed of 8000 rpm for 10 minutes, remove the supernatant, and precipitate the solid with deCO 2 Continue hig...

Embodiment 3

[0033] The experimental water was used to remove CO from the freshly boiled 2 of secondary deionized water, reacted at N 2 under atmosphere. Weigh 23.28g of Co(NO 3 ) 2 ·6H 2 O and 7.50g of Al(NO 3 ) 3 9H 2 O dissolved in 100mL to remove CO 2 1.0mol / L mixed solution (Co 2+ with Al 3+ The molar ratio is 4:1), added dropwise to 100 mL of lactic acid (LA) solution with a concentration of 4.80 mol / L (LA and Co 2+ The molar ratio is 6:1). At the same time, 80 mL of NaOH solution (NaOH and Co 2+ The molar ratio is 5:1), stirring to maintain pH=10. The resulting slurry is crystallized at 80° C. for 16 hours in a closed container to obtain lactic acid intercalated hydrotalcite. Lactic acid intercalated hydrotalcite with deCO 2 Wash with deionized water, then centrifuge at 10,000 rpm for 15 minutes at a high speed, remove the supernatant, and precipitate the solid with deCO 2 Continue high-speed centrifugation after washing with deionized water, repeat the above-mentione...

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Abstract

The invention discloses an inorganic / organic nanometer composite solid electrolyte and a preparation method thereof, belonging to the inorganic / organic nanometer composite material and the preparation process field. The solid electrolyte is composed by polyethylene oxides PEO, lithium perchlorates LiClO4 and hydrotalcite nanometer sheets LDHNS, has a chemical formula of PEO / LiClO4 / LDHNS, the mass parts of each component are 54-91%, 8-16% and 1-30% respectively. The preparation method of the composite solid electrolyte comprises: mixing PEO, LiClO4 and LDHNS in water equably and sufficiently, and then vaporizing the solvent to obtain the composite solid electrolyte of the invention. The inorganic / organic nanometer composite solid electrolyte according to the invention has high conductivity, high lithium ion transference number and heat stability, the electrolyte can be used as the electrolyte of a solid lithium ion battery.

Description

technical field [0001] The invention relates to an inorganic / organic nanocomposite solid electrolyte and a preparation method thereof, and belongs to the technical field of inorganic / organic nanocomposite materials and their preparation. Background technique [0002] In lithium-ion batteries, the use of solid electrolytes has the advantages of less leakage, safety, and easy installation compared to liquid electrolytes, but the low ion mobility and poor thermal stability of solid electrolytes limit their use in actual production. application. Among many conductive polymer matrices, polyethylene oxide (PEO) is a fast ion conductor and a good solvent for lithium salts. It has the advantages of good chemical stability, easy availability of raw materials, and simple synthesis methods. However, unmodified pure PEO has the following disadvantages as a solid electrolyte: firstly, because it is a macromolecular polymer, the ion conductivity is low due to its high crystallinity, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/00H01M6/18H01M10/36H01M10/40B01J19/00B82B1/00B82B3/00
CPCH01M10/052H01M6/181H01M6/185H01M10/0565H01M2300/0068H01M2300/0082H01M2300/0091Y02E60/122Y02E60/10
Inventor 杨文胜王健王立仕
Owner BEIJING UNIV OF CHEM TECH
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