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A kind of composite material, its preparation method and aqueous lithium ion battery

A lithium-ion battery and composite material technology, applied in the field of water-based lithium-ion batteries, can solve the problems of hindered capacity, instability, poor stability, etc., and achieve the effects of stable cycle times, smooth voltage platform, and excellent low-temperature performance.

Active Publication Date: 2021-07-27
NINGBO FENGCHENG NANOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, lithium titanium phosphate negative electrode materials have been developed at home and abroad for use in aqueous lithium-ion batteries, but this material is unstable to oxygen and hydroxide in aqueous solutions, so the battery cycle life is low
In addition, at low temperatures, after lithium ions reach the lithium titanium phosphate negative electrode, the diffusion in the negative electrode material becomes difficult, which will lead to poor low-temperature performance of the lithium titanium phosphate negative electrode material.
Low-temperature performance limits the application of lithium titanium phosphate anode in the field of electrochemical energy storage, military industry and extreme environments. The development of lithium-ion batteries with excellent low-temperature performance is an urgent demand in the market
It can be seen that the traditional lithium titanium phosphate polyanion compound negative electrode has defects such as small theoretical capacity and poor stability.
[0004] In response to the above problems, many research teams have adopted the carbon coating strategy of lithium titanium phosphate, which can improve the stability of lithium titanium phosphate negative electrode materials to a certain extent, but the dense coating layer of carbon film will inhibit the lithium ions in the electrolyte from interacting with the active electrode. The mutual transmission between them seriously hinders its capacity, and the low-temperature performance of carbon-coated lithium titanium phosphate lithium polyanion compound anode is poor, which limits its practical energy storage application.

Method used

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  • A kind of composite material, its preparation method and aqueous lithium ion battery
  • A kind of composite material, its preparation method and aqueous lithium ion battery
  • A kind of composite material, its preparation method and aqueous lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Step A: according to silicon element in trimethylsilyl imidazole: the mol ratio of chlorine element in chloroacetonitrile is 1:2, add trimethylsilyl imidazole, chloroacetonitrile, reaction vessel is a round bottom glass flask, reactant The reaction was stirred at room temperature for 24 hours at a stirring rate of 400 rpm.

[0064] Step B: collect the product, wash with methanol to remove impurities, and dry it in vacuum at 105° C. to obtain a dry powder of the ionic liquid monomer.

[0065] Step C: Add the imidazolium ionic liquid monomer and the lithium titanium phosphate polyanion compound according to the molar ratio of 1:8 and mix them well. 2 Under protection, calcined at 400°C for 2 hours, the heating rate was 5°C / min, and ground after cooling, the obtained dry powder was 1 # Polyionic liquid / lithium titanium phosphate polyanion compound composite material.

Embodiment 2

[0067] Step A: According to the silicon element in tributylsilyl imidazole: the mol ratio of chlorine element in chloropropionitrile is 1:2.1, add tributylsilyl imidazole, chloropropionitrile and lithium titanium phosphate polyanion compound, the reaction vessel is In a round-bottomed glass flask, the reactant was stirred and reacted at 10°C for 30 hours, and the stirring rate was 400 rpm.

[0068] Step B: collect the resultant, wash with ethanol to remove impurities, and then vacuum-dry at 120°C to obtain a dry powder.

[0069] Step C: Add imidazolium ionic liquid monomer and lithium titanium phosphate polyanion compound according to the molar ratio of 1:10 and mix them well, put the above dry powder in a quartz boat, place it in a tube furnace, and dry it under N 2 Under protection, calcined at 500°C for 1 hour, the heating rate was 10°C / min, ground after cooling, and the obtained dry powder was 2 # Polyionic liquid / lithium titanium phosphate polyanion compound composite ma...

Embodiment 3

[0071] Step A: according to the silicon element in triethylsilyl imidazole: the molar ratio of bromine element in bromoacetonitrile is 1:1, add triethylsilyl imidazole, bromoacetonitrile and lithium titanium phosphate polyanion compound, and the reaction vessel is a round bottom In a glass flask, the reactant was stirred and reacted at 35° C. for 15 hours, and the stirring rate was 400 rpm.

[0072] Step B: collect the resultant, wash with acetone to remove impurities, and then vacuum-dry at 90° C. to obtain a dry powder.

[0073] Step C: Add imidazolium ionic liquid monomer and lithium titanium phosphate polyanion compound according to the molar ratio of 1:5 and mix thoroughly, put the above dry powder in a quartz boat, place it in a tube furnace, and heat it under N 2 Under protection, calcined at 300°C for 3 hours, the heating rate was 2°C / min, and ground after cooling, the obtained dry powder was 3 # Polyionic liquid / lithium titanium phosphate polyanion compound composite...

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Abstract

The application discloses a composite material of polyionic liquid / lithium titanium phosphate polyanion compound, comprising: lithium titanium phosphate polyanion compound; and polyionic liquid coated on the surface of the lithium titanium phosphate polyanion compound. The application also provides a preparation method of polyionic liquid / lithium titanium phosphate polyanion compound composite material and a water-based lithium ion battery. The application provides an efficient and simple synthesis method, and the polyionic liquid / lithium titanium phosphate polyanion compound composite material prepared by the method can be used as a negative electrode for a water-based lithium-ion battery. The anode material covers various polyionic liquid / titanium phosphate compounds. The aqueous battery has the advantages of absolute safety (no fire, no explosion), environmental friendliness, controllable cost, and excellent low-temperature performance.

Description

technical field [0001] The application relates to a polyionic liquid / lithium titanium phosphate polyanion compound material, a preparation method thereof and an aqueous lithium ion battery, belonging to the field of energy storage. Background technique [0002] Aqueous lithium-ion batteries are battery systems in which an aqueous solution of inorganic salts is used as the electrolyte. It not only avoids the flammability problem of the organic electrolyte of traditional oil-based lithium batteries, but also overcomes the problems of high pollution and short life of traditional water-based batteries (such as lead-acid batteries). In addition, aqueous lithium-ion batteries have the advantages of being environmentally friendly, low cost, and good fast charging performance, so they are gradually being valued by the large-scale energy storage market. Among them, the negative electrode material is one of the important parameters of the capacity and cycle life of the aqueous lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M10/36C01B25/45
CPCC01B25/45C01P2006/40H01M4/366H01M4/5825H01M4/608H01M10/36H01M2004/027Y02E60/10
Inventor 吴志连李忆非李书顶张旭锋王敏刚王耀国
Owner NINGBO FENGCHENG NANOTECHNOLOGY CO LTD