Nitrogen-doped carbon-packaged lithium ion sieve membrane electrode for electrochemical extraction of dissolved lithium resources

A technology of nitrogen-doped carbon and lithium ions, which is applied in the field of electrochemical lithium extraction, can solve the problems of poor conductivity of electrode materials and limitations of atomic dissolution loss, and achieve increased crystallinity, reduced polarization, and enrichment performance Improved effect

Active Publication Date: 2021-09-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, researchers have extensively studied electrode materials represented by lithium manganese oxide, lithium titanate, lithium iron phosphate, and ternary lithium battery materials. The inherent defects of loss and Jhan-Teller effect limit its application in the field of electrochemical lithium extraction to a certain extent.

Method used

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  • Nitrogen-doped carbon-packaged lithium ion sieve membrane electrode for electrochemical extraction of dissolved lithium resources
  • Nitrogen-doped carbon-packaged lithium ion sieve membrane electrode for electrochemical extraction of dissolved lithium resources
  • Nitrogen-doped carbon-packaged lithium ion sieve membrane electrode for electrochemical extraction of dissolved lithium resources

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The main material is lithium manganate, and the carbon encapsulation material is pyrrole. Under the condition of the optimal mass ratio of lithium manganate: pyrrole = 1:0.135 as an example, the nitrogen-doped carbon encapsulation lithium manganate electrode material according to the present invention Preparation and performance testing, including the following steps

[0060] (1) Preparation of polypyrrole-derived nitrogen-doped carbon-encapsulated lithium manganese oxide powder

[0061] Lithium manganate lithium ion sieve powder was prepared by high temperature solid phase method. By the method described above, the pyrrole monomer in LiMn 2 o 4 Three-dimensional coating is carried out on the surface of the lithium ion sieve to obtain a nitrogen-containing polymer-encapsulated lithium manganate intermediate. The obtained intermediate is placed in a crucible and calcined in a tube furnace under high temperature conditions. The resulting powder is the example: a lithi...

Embodiment 2

[0105] Other steps are the same as in Example 1, except that polypyrrole is replaced by poly-2,5-dimethoxyaniline, and the calcination temperature is replaced by 500°C to 600°C;

[0106] The nitrogen-doped carbon-encapsulated lithium manganese oxide film electrode based on polyaniline exhibited similar performance to that of Example 1, and the adsorption performance was improved, and the equilibration time was about 1 hour.

Embodiment 3

[0108] Other steps are the same as in Example 1, except that polypyrrole is replaced by poly-2,5-dimethoxyaniline, and the calcination temperature is replaced by 500°C to 600°C;

[0109] The nitrogen-doped carbon-encapsulated lithium manganese oxide film electrode based on poly-2,5-dimethoxyaniline exhibited similar performance to Examples 1 and 2, and the adsorption rate was improved, and the equilibrium time was about 1 hour.

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Abstract

The invention relates to a nitrogen-doped carbon-packaged lithium ion sieve membrane electrode for electrochemical extraction of dissolved lithium resources. An electrode material of the membrane electrode comprises a lithium ion sieve and a packaging layer derived from a nitrogen-containing polymer, and nitrogen-containing polymer monomers are specifically pyrrole, aniline, acrylonitrile, amide, ethyleneimine, dopamine and urethane. In the preparation process, a two-stage polymerization mode, namely low-temperature prepolymerization and room-temperature polymerization, is adopted, different feeding ratios with the interval of 1: 0.1-1: 10 are adjusted, and calcination is carried out at the high temperature of 200-700 DEG C in an N2 environment, so that a uniform and complete carbon-packaged lithium ion sieve electrode material is obtained, and the carbon-packaged lithium ion sieve membrane electrode is prepared for enrichment of the dissolved lithium resources. The novel lithium ion sieve membrane electrode has the relatively high lithium extraction rate, the lithium ion selectivity and the stable circulation capability in a low-grade lithium raw material solution with complex coexisting ions.

Description

technical field [0001] The invention belongs to the technical field of electrochemical lithium extraction, and in particular relates to a membrane electrode material for electrochemical extraction of dissolved lithium resources and a preparation method thereof. Background technique [0002] Lithium metal has the advantages of high specific heat, electrical conductivity and chemical activity, and has always played a pivotal role in the fields of energy, materials, medical, chemical, aerospace and national defense. With the advent of the information age and the green economy era, clean lithium-ion batteries with light weight, small volume and high energy density have been extremely widely developed and applied. At the same time, the rapid development of the lithium battery industry has also led to a leap in the market demand for lithium resources. At present, lithium resources mainly come from terrestrial lithium mines. Although today's terrestrial lithium mines can still mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B7/00
CPCC22B26/12C22B7/005Y02P10/20
Inventor 纪志永方嘉炜袁俊生汪婧刘杰赵颖颖郭志远郭小甫
Owner HEBEI UNIV OF TECH
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