Method for inhibiting lithium side reaction and dendritic crystal growth by electrolyte reservoir

An electrolyte and storage technology, applied in electrochemical generators, circuits, electrical components, etc., can solve the problems of aggravating the side reaction of metal lithium, increasing the contact area between metal lithium and electrolyte, and aggravating the side reaction of lithium. Low cost, simple preparation method, and the effect of improving coulombic efficiency

Active Publication Date: 2020-06-16
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the growth of dendrites is the result of the joint influence of many factors. A single method cannot completely inhibit the growth of dendrites, and even intensify lithium side reactions during the process of inhibiting dendrite growth, such as increasing the specific surface area of ​​the electrode. It can indeed inhibit the growth of dendrites, but at the same time it also increases the contact area between metal lithium and electrolyte, which intensifies the side reaction of metal lithium

Method used

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  • Method for inhibiting lithium side reaction and dendritic crystal growth by electrolyte reservoir
  • Method for inhibiting lithium side reaction and dendritic crystal growth by electrolyte reservoir
  • Method for inhibiting lithium side reaction and dendritic crystal growth by electrolyte reservoir

Examples

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Effect test

Embodiment 1

[0052] A method for electrolyte storage to suppress lithium side reactions and dendrite growth, the specific process of the method comprises the following steps:

[0053] (1) Preparation of a hollow three-dimensional material rich in "lithophilic" elements and functional groups capable of forming hydrogen bonds with the electrolyte solvent, the specific steps are as follows:

[0054] (a) Place commercial melamine foam in deionized water and ultrasonically clean it 3 times, then dry it in an oven at 80 degrees;

[0055] (b) Put the melamine foam after washing and drying into the tube furnace, 2 Under gas protection, the temperature was programmed to 400° C. at a rate of 4° C. per minute, kept at this temperature for 3 hours, and then cooled to room temperature.

[0056] (2) Place the electrolyte reservoir obtained in step (1) directly between the positive and negative electrodes of the battery, where the electrolyte composition is 1M LiTFSI / DOL / DME (the volume ratio of DOL to ...

Embodiment 2

[0058] A method for electrolyte storage to suppress lithium side reactions and dendrite growth, the specific process of the method comprises the following steps:

[0059] (1) Preparation of a hollow three-dimensional material rich in "lithophilic" elements and functional groups capable of forming hydrogen bonds with the electrolyte solvent, the specific steps are as follows:

[0060] (a) Place commercial melamine foam in deionized water and ultrasonically clean it 3 times, then dry it in an oven at 80 degrees;

[0061] (b) Put the melamine foam after washing and drying into the tube furnace, 2 Under gas protection, the temperature was programmed to 400° C. at a rate of 4° C. per minute, kept at this temperature for 3 hours, and then cooled to room temperature.

[0062] (2) Place the electrolyte reservoir obtained in step (1) directly between the positive and negative electrodes of the battery, and the electrolyte composition is 1M LiPF 6 / EC / DEC (the volume ratio of EC to DE...

Embodiment 3

[0064] A method for electrolyte storage to suppress lithium side reactions and dendrite growth, the specific process of the method comprises the following steps:

[0065] (1) Preparation of a hollow three-dimensional material rich in "lithophilic" elements and functional groups capable of forming hydrogen bonds with the electrolyte solvent, the specific steps are as follows:

[0066] (a) Place commercial melamine foam in deionized water and ultrasonically clean it 3 times, then dry it in an oven at 80 degrees;

[0067] (b) Put the melamine foam after washing and drying into the tube furnace, 2 Under gas protection, the temperature was programmed to 300° C. at a rate of 1° C. per minute, kept at this temperature for 1 hour, and then cooled to room temperature.

[0068] (2) Place the electrolyte reservoir obtained in step (1) directly between the positive and negative electrodes of the battery, where the electrolyte composition is 1M LiTFSI / DOL / DME (the volume ratio of DOL to D...

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Abstract

The invention discloses a method for inhibiting lithium side reaction and dendritic crystal growth by an electrolyte reservoir. According to the specific process of the method, the electrolyte reservoir is inserted between the positive electrode and negative electrode of a battery so as to store an electrolyte to reduce the side reaction between the electrolyte and an electrode material and inhibit dendritic crystal growth. The electrolyte reservoir is made of a hollow three-dimensional material which is rich in lithium ion affinity elements and functional groups capable of forming hydrogen bonds with an electrolyte solvent. The elements, which are affine to lithium ions, in the liquid reservoir can adjust the distribution of the lithium ions, inhibit dendritic crystal growth and enable the electrolyte to smoothly enter the liquid reservoir; and on the basis of the hollow structure of the liquid reservoir, the electrolyte represents a concave liquid surface in the liquid reservoir, sothat the contact between the electrolyte and the electrode material is reduced, and the side reaction is inhibited. Moreover, the functional groups in the liquid reservoir are combined with the electrolyte solvent through the effect of the hydrogen bonds, so that the solvation effect of the lithium ions in the electrolyte is weakened, the migration number of the lithium ions is increased, and therefore, the dendritic crystal growth is further inhibited.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for an electrolyte storage to suppress lithium side reactions and dendrite growth. Background technique [0002] Traditional lithium-ion batteries use graphite carbon as the negative electrode, and lithium iron phosphate, lithium cobalt oxide or ternary materials as the positive electrode. However, the theoretical specific capacity of these electrode materials is limited, which gradually cannot meet people's demand for energy storage with high energy density and high power density. with the conversion device on demand. Therefore, finding new electrode materials to replace traditional lithium battery electrode materials has received extensive attention. Lithium metal has a very high capacity density and the lowest redox potential, which is an excellent material for the negative electrode of batteries. However, there are many problems in the application of ...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/0525
CPCH01M10/4235H01M10/0525Y02E60/10
Inventor 康毅进徐英李涛
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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