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A liquid active lithium supplement, its preparation method and its use

A supplement and active technology, which is applied in the field of preparation of the active lithium supplement, can solve the problems of reduced capacity, safety not higher than that of lithium powder, etc., and achieves the effects of easy storage, improved reversible charge and discharge capacity, and low cost

Active Publication Date: 2020-07-28
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems in this invention, such as n-butyllithium and tert-butyllithium used are highly flammable and explosive dangerous goods, and their safety is not higher than that of lithium powder; although the organolithium sprayed on the surface of the positive electrode has some Organolithium is reduced and intercalated into the positive electrode, but there are still many residues, which will further reduce the capacity

Method used

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  • A liquid active lithium supplement, its preparation method and its use
  • A liquid active lithium supplement, its preparation method and its use
  • A liquid active lithium supplement, its preparation method and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Preparation of liquid active lithium supplement

[0039] This example prepares a liquid active lithium supplement according to the following steps, which are carried out at room temperature:

[0040] 1. Take 0.16g lithium sulfide (Li 2 S), 0.02g Super P and 0.02g PVP were placed in 20ml of methanol, ultrasonicated for 10h, and then stirred for 10h to evenly mix to obtain a liquid active lithium supplement, which was designated as A1.

[0041] 2. Take 0.16g lithium sulfide (Li 2 S), 0.02g Super P and 0.02g PVP were placed in 20ml ethanol, ultrasonicated for 10h, and then stirred for 10h to evenly mix to obtain a liquid active lithium supplement, which was designated as A2.

[0042] 3. Take 0.16g lithium sulfide (Li 2 S), 0.02g Super P and 0.02g PVP were placed in 20ml TEGDME, ultrasonicated for 10h, and then stirred for 10h to evenly mix to obtain a liquid active lithium supplement, which was designated as A3.

[0043] 4. Take 0.16g lithium sulfide (Li 2...

Embodiment 2

[0056] Example 2 Preparation of Liquid Active Lithium Supplement

[0057] This example prepares a liquid active lithium supplement according to the following steps, which are carried out at room temperature:

[0058] 1. Take 0.0115g lithium sulfide (Li 2 S) and 0.056g of sulfur (S), were placed in tetraethylene glycol dimethyl ether (TEGDME), stirred for 6h and mixed evenly to obtain a liquid active lithium supplement, which was denoted as B1.

[0059] 2. Take 0.0115g lithium sulfide (Li 2 S) and 0.056g of sulfur (S), were placed in dimethyl ether (DME), stirred for 6h and evenly mixed to obtain a liquid active lithium supplement, which was denoted as B2.

[0060] 3. Take 0.0115g lithium sulfide (Li 2 S) and 0.048g of sulfur (S), were placed in tetraethylene glycol dimethyl ether (TEGDME), stirred for 6h and mixed evenly to obtain a liquid active lithium supplement, which was denoted as B3.

[0061] 4. Take 0.0115g lithium sulfide (Li 2 S) and 0.048g of sulfur (S), put ...

Embodiment 3

[0068] Embodiment 3 comparative example

[0069] This example was formulated as a comparative active lithium supplement according to the following steps, which were carried out at room temperature:

[0070] Get 0.16g lithium sulfide (Li 2 S), 0.02g Super P and 0.02g PVP were uniformly mixed in NMP to obtain an active lithium supplement, which was denoted as C1.

[0071] Get 0.08g lithium sulfide (Li 2 S), 0.09g Super P and 0.04g PVP were uniformly mixed in NMP to obtain an active lithium supplement, which was denoted as C2.

[0072] Get 0.18g lithium sulfide (Li 2 S) and 0.02g of PVP were uniformly mixed in NMP to obtain an active lithium supplement, which was denoted as C3.

[0073] Get 0.18g lithium sulfide (Li 2 S) and 0.02g Super P are uniformly mixed in NMP to obtain an active lithium supplement, which is denoted as C4.

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Abstract

Provided is a liquid active lithium supplement for supplementing a lithium ion battery with active lithium. The liquid active lithium supplement is a solution or a suspension, and comprises sulfides of lithium and a solvent. The solvent can dissolve or partially dissolve the sulfides of lithium; and / or the solvent does not physically and / or chemically react with electrolytes of the lithium ion battery; and / or the solvent is selected from the electrolytes of the lithium ion battery. Also provided are a method for supplementing a lithium ion battery with active lithium, and a lithium ion battery. The liquid active lithium supplement is simple to prepare and convenient to use, and has high safety and low costs. The liquid active lithium supplement has good compatibility with cathode materials, anode materials, and electrolytes of a lithium ion battery, and can be used for preparing lithium ion batteries, thereby improving the reversible charge and discharge capability and subsequent cyclic stability of all batteries.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries. Specifically, the present invention relates to a liquid active lithium supplement based on lithium sulfide, and the present invention also relates to a preparation method and use of the active lithium supplement. Background technique [0002] Due to the advantages of high discharge voltage, high energy density and long cycle life, lithium-ion batteries have been widely used in various small portable electronic devices, such as notebook computers, mobile phones and cameras, etc. Favored in high-tech fields, such as aerospace satellites, electric vehicles and military, these applications require lithium-ion batteries to have better capacity and cycle life. [0003] It is known to those skilled in the art that when a lithium-ion battery is charged and discharged for the first time, a solid electrolyte film (SEI film) will be formed on the negative electrode material surface of the lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235H01M4/13H01M4/139H01M4/62Y02E60/10
Inventor 詹元杰黄学杰俞海龙
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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