Lithium battery

A lithium battery and electrolyte technology, applied in secondary batteries, battery electrodes, secondary battery manufacturing, etc., can solve the problems of flammability of organic solvents, poor safety, and high production costs, and achieve a wide operating temperature range and high voltage window. Effect

Inactive Publication Date: 2020-04-21
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte salts commonly used in organic electrolytes generally use quaternary ammonium salts, which have high production costs, and the organic solvents used are flammable and poor in safety.

Method used

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Examples

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Effect test

Embodiment 1

[0033] The specific composition of the water-based electrolyte in this example is solvent water, the functional solute for limiting water molecules is sucrose, and the electrolyte is lithium perchlorate. The preparation method is as follows: 2 g of sucrose and 0.17 g of lithium perchlorate are successively added to Put it in a glass sample bottle of deionized water, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until it is fully dissolved, and then obtain the aqueous electrolyte solution of this example after cooling. Among them, the mass fraction of sucrose in the electrolyte is 63.1%. The electrochemical window of the aqueous electrolyte prepared in this example was tested by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum plate electrode as counter electrode). The results show that the electrochemical stability window of the aqueous electrolyte is 2.7V, and the aqu...

Embodiment 2

[0036] The specific composition of the water-based electrolyte in this example is solvent water, the functional solute of restricted water molecules is fructose, and the electrolyte is lithium perchlorate. Put it in a glass sample bottle of deionized water, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until it is fully dissolved, and then obtain the aqueous electrolyte solution of this example after cooling. Among them, the mass fraction of fructose in the electrolyte is 63.1%. The electrochemical window of the aqueous electrolyte prepared in this example was tested by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum plate electrode as counter electrode). The results show that the electrochemical stability window of the aqueous electrolyte is 2.6V, and the aqueous electrolyte will not freeze at -40°C, and there is no solute precipitation.

[0037] The aqueous electro...

Embodiment 3

[0039] The specific composition of the water-based electrolyte in this example is solvent water, the functional solute of restricted water molecules is maltose, and the electrolyte is lithium perchlorate. The preparation method is as follows: Weigh 1.5g of maltose and 0.17g of lithium perchlorate into a Put 1g of deionized water in a glass sample bottle, seal it, put it in a blast drying oven at 90°C and heat it for 20 minutes until fully dissolved, and then obtain the aqueous electrolyte solution of this example after cooling. Among them, the mass fraction of maltose in the electrolyte is 56.2%. The electrochemical window of the aqueous electrolyte prepared in this example was tested by linear voltammetry (saturated calomel electrode as reference electrode, platinum disk electrode as working electrode, and platinum plate electrode as counter electrode). The results show that the electrochemical stability window of the aqueous electrolyte is 2.5V.

[0040] The aqueous electro...

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Abstract

The invention discloses a lithium battery which comprises a positive electrode, a negative electrode and an electrolyte solution, the active material of the positive electrode is lithium manganate oractive carbon, the active material of the negative electrode is lithium titanate, and the electrolyte comprises a confinement water molecule functional solute, a solvent and an electrolyte, wherein the confinement water molecule functional solute is selected from one or more of monosaccharide or disaccharide and the electrolyte is a soluble salt of alkali metal comprising lithium. The lithium battery has a high voltage window, a wide working temperature interval and high use safety.

Description

technical field [0001] The invention relates to the technical field of lithium batteries. More specifically, it relates to a lithium battery with a high voltage window and a wide operating temperature range. Background technique [0002] The salient features of lithium batteries are light weight, high energy and long life, and they are widely used as power sources for various portable electronic devices. [0003] As the electrolyte of lithium batteries, it is generally desired to have a high decomposition voltage and a large electrochemical window, so that the battery using the electrolyte has a higher energy storage density for better use in actual production and life middle. The electrolyte used in existing lithium batteries is usually an aqueous electrolyte or an organic electrolyte. Although the water-based electrolyte is cheap, the traditional water-based electrolyte is limited by the low decomposition voltage of water and the small electrochemical window, and becaus...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/587H01M4/485H01M10/04H01M10/36H01M10/38
CPCH01M4/485H01M4/505H01M4/587H01M10/0427H01M10/36H01M10/38H01M2300/0002H01M2300/0091Y02E60/10Y02P70/50
Inventor 薛面起毕海波王旭升
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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