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A doped modified lithium ion sieve and its preparation method and application

A lithium ion, modified technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of lithium recovery rate less than 1%, decreased adsorption capacity, low adsorption capacity, etc. Achieve the effect of maintaining cycle stability, small average particle size, and strong universal applicability

Active Publication Date: 2019-11-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the academic circles and the business circles have started to carry out the research and industrialization process of the recycling of waste lithium-ion batteries, but most of them focus on the recovery of valuable metal elements such as Co and Ni, and the recovery rate of lithium is still less than 1%.
[0005] Lithium-ion sieves obtained in the prior art have problems such as low adsorption capacity, serious dissolution loss, and significant drop in adsorption capacity after repeated use.

Method used

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  • A doped modified lithium ion sieve and its preparation method and application
  • A doped modified lithium ion sieve and its preparation method and application
  • A doped modified lithium ion sieve and its preparation method and application

Examples

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Effect test

Embodiment 1

[0034] A nickel-doped modified HMn 2 o 4 The preparation method of lithium ion sieve comprises the following steps:

[0035] (1) 12.2g manganese acetate tetrahydrate, 0.124g nickel acetate tetrahydrate, 30.0g urea and 20.0g polyethylene glycol were added to 1000ml deionized water, stirred and mixed evenly to obtain a dark red transparent mixed solution;

[0036] (2) Transfer the mixed solution obtained in step (1) to a 1.5L polytetrafluoroethylene-lined stainless steel reactor, put the reactor into a homogeneous reactor, and perform a hydrothermal reaction at a reaction temperature of 180°C , the reaction time is 12h; after the reaction is finished, the obtained product is washed and then put into a vacuum drying oven and dried at 60°C for 12h to obtain nickel-doped manganese carbonate;

[0037] (3) get 2.87g by the nickel-doped manganese carbonate that step (2) obtains, weigh lithium carbonate 0.95g, after fully mixing in grinding, put into crucible and place in muffle furn...

Embodiment 2

[0043] A kind of cobalt-doped modified HMn 2 o 4 The preparation method of lithium ion sieve comprises the following steps:

[0044] (1) 12.67g manganese sulfate monohydrate, 0.649g anhydrous cobalt sulfate, 10.0g urea and 5.0g polyethylene glycol were added to 1000ml deionized water, stirred and mixed evenly to obtain a dark red transparent mixed solution;

[0045] (2) Transfer the mixed solution obtained in step (1) to a 1.5L polytetrafluoroethylene-lined stainless steel reactor, put the reactor into a homogeneous reactor, and perform a hydrothermal reaction at a reaction temperature of 190°C , the reaction time is 8h; after the reaction is finished, the obtained product is washed and placed in a vacuum drying oven at 60°C for 12h to obtain cobalt-doped manganese carbonate;

[0046] (3) 2.87g is taken by the cobalt-doped manganese carbonate that step (2) obtains, weigh lithium carbonate 0.92g, after fully mixing in grinding, put into crucible and place in muffle furnace, i...

Embodiment 3

[0052] A nickel-doped modified HMn 2 o 4 The preparation method of lithium ion sieve comprises the following steps:

[0053] (1) 12.58g anhydrous manganese chloride, 0.26g anhydrous nickel chloride, 20.0g urea and 10.0g polyethylene glycol are added to 1000ml deionized water, stirred and mixed evenly to obtain a dark red transparent mixed solution;

[0054] (2) Transfer the mixed solution obtained in step (1) to a 1.5L polytetrafluoroethylene-lined stainless steel reactor, put the reactor into a homogeneous reactor, and perform a hydrothermal reaction at a reaction temperature of 150°C , the reaction time is 12h; after the reaction is finished, the obtained product is washed and then put into a vacuum drying oven and dried at 60°C for 12h to obtain nickel-doped manganese carbonate;

[0055] (3) the nickel-doped manganese carbonate that step (2) obtains is got 2.87g, weighs lithium carbonate 0.96g, after fully mixing in grinding, puts into crucible and places muffle furnace, ...

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Abstract

The invention discloses a doped modified lithium ion sieve. The doped modified lithium ion sieve adopts a molecular formula as follows: HMxMn2-xO4, wherein M is Co or Ni and x is greater than or equalto 0.020 and smaller than or equal to 0.095; the crystal form of the doped modified lithium ion sieve is a single pure-phase spinel crystal form; the lithium ion sieve is spherical and has the average particle diameter of 2-5 microns. The invention further correspondingly provides a preparation method and the application of the doped modified lithium ion sieve. Through doping modification of nickel or cobalt, the cell structure of the doped modified lithium ion sieve is more stable, so that the problem of easy dissolution of the conventional HMn2O4 lithium ion sieve is solved, and the doped modified lithium ion sieve can be repeatedly recycled for many times; in addition, the doped modified lithium ion sieve has excellent morphology, small average particle size and a relatively large specific surface area, and the specific morphology thereof benefits sufficient contact of lithium-containing liquid, facilitates intercalation and extraction of lithium ions and benefits maintenance of the cycle stability of a material.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, in particular to a lithium ion sieve and its preparation method and application. Background technique [0002] my country is the world's largest producer and consumer of lithium-ion batteries. It is predicted that by 2020, my country's lithium-ion battery output will exceed 25 billion, and its lifespan is only 2-3 years. After a large number of waste lithium-ion batteries are scrapped, There will be a huge social stockpile. At present, both academia and business circles have started to carry out the research and industrialization process of recycling waste lithium-ion batteries, but most of them focus on the recovery of valuable metal elements such as Co and Ni, and the recovery rate of lithium is still less than 1%. [0003] Lithium ion sieve is a general term for a class of adsorbents that can selectively adsorb lithium from a solution. It has a unique chemical structure. Lithium i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06C01G45/00C02F1/28B01J20/30C02F101/10
CPCB01J20/0203B01J20/06C01G45/00C01P2004/32C01P2004/61C01P2006/80C02F1/281C02F2101/10
Inventor 黄国勇郭学益赵金龙曹笑
Owner CENT SOUTH UNIV
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