Lithium resource recovery method for waste batteries based on solid electrolyte

A solid electrolyte and waste battery technology, which is applied in battery recycling, waste collector recycling, secondary batteries, etc., can solve the problems of high impurities, high energy consumption in high temperature treatment, slow kinetic rate, etc., and achieve high-purity lithium resource recovery , improve lithium recovery efficiency, and compensate for cost consumption

Active Publication Date: 2022-05-24
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hydrometallurgical technology mainly relies on acid / alkali leaching to recover nickel, cobalt, and lithium from spent LIBs, but the use of alkali and acid leaching will generate a large amount of waste liquid to be treated, and the lithium recovery process is usually in the last step, which inevitably leads to lithium Low concentration (0.5-3g / L) and high impurities
In addition, the method based on pyrometallurgy is currently the most frequently used method in industry due to its short time and easy scale, but it still faces the problem of lithium loss in the slag phase
At the same time, the energy consumption of high-temperature treatment is high, and the electrolyte and other components in the electrode are converted into CO by combustion. 2 and other harmful ingredients such as P 2 o 5 , will cause secondary pollution
In addition, biometallurgy is a mineral biooxidation process assisted by microorganisms, in which bacteria are difficult to cultivate, slow kinetic rate and low pulp density are its Achilles' heels

Method used

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  • Lithium resource recovery method for waste batteries based on solid electrolyte
  • Lithium resource recovery method for waste batteries based on solid electrolyte
  • Lithium resource recovery method for waste batteries based on solid electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0023] like figure 1 As shown, the solid electrolyte-based lithium resource recovery method for used batteries in this embodiment, the specific steps of the method are as follows:

[0024] S1. Preparation of LLZTO waterproof ceramic tube: in a fume hood, dissolve a certain mass of P3HT powder in a carbon disulfide solution, wherein the ratio of P3HT powder to carbon disulfide solution is 12mg / ml, seal and stir to make a modified solution, and then mix LLZTO The ceramic tube is soaked in the modified solution for 5 minutes, and the soaked LLZTO ceramic tube is placed in a vacuum drying oven for drying. After drying, the surface of the LLZTO will form a waterproof coating;

[0025] S2, in the glove box, the electrode sheet of the taken out waste battery is wetted by lithium ion electrolyte, and the lithium ion electrolyte is 1M lithium hexafluorophosphate dissolved in ethylene carbonate with a volume ratio of 1:1, Mixed in diethyl carbonate;

[0026] S3. In the glove box, the ...

Embodiment 2

[0033] The solid electrolyte-based lithium resource recovery method for used batteries of the present embodiment, the specific steps of the method are as follows:

[0034] S1. Preparation of LLZTO waterproof ceramic tube: in a fume hood, dissolve a certain mass of P3HT powder in chloroform solution, in which the ratio of P3HT powder to chloroform solution is 22mg / ml, seal and stir to make a modified solution, and then mix LLZTO The ceramic tube is soaked in the modified solution for 5 minutes, and the soaked LLZTO ceramic tube is placed in a vacuum drying oven for drying. After drying, the surface of the LLZTO will form a waterproof coating;

[0035] S2, in the glove box, the electrode sheet of the taken out waste battery is wetted by lithium ion electrolyte, and the lithium ion electrolyte is 1M lithium hexafluorophosphate dissolved in ethylene carbonate with a volume ratio of 1:1, Mixed in diethyl carbonate;

[0036] S3. In the glove box, the wetted electrode sheet prepared...

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Abstract

The invention discloses a method for recycling lithium resources of waste batteries based on a solid electrolyte. The method is driven by an external electric field, and the high selectivity of LLZTO can extract Li embedded in the anode electrode. + , and recovered in the form of LiOH, while collecting H 2 . In addition, the performance of LLZTO in aqueous solution was successfully extended by modifying the surface of LLZTO with P3HT, which not only prevents the H between water and LLZTO + / Li + exchange, and is conducive to the extraction of lithium resources from waste batteries. Based on this condition, our strategy has been proven to achieve non-destructive, reproducible, high-purity lithium resource recovery from various types of spent lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of recycling and utilization of waste batteries, in particular to a method for recycling lithium resources of waste batteries based on solid electrolytes. Background technique [0002] Lithium, as the lightest metal in nature, has high electrochemical activity, the lowest redox potential (-3.045V vs standard hydrogen electrode) and the highest theoretical specific capacity (3870mAh / g) compared with other solid elements, It has become an important energy material in industrial fields, such as batteries, nuclear fusion, aircraft products, ceramic glass, lubricants and cement. As far as we know, lithium exists in two forms in nature, as lithium carbonate (Li 2 CO 3 ) in the form of spodumene and lepidolite, in the ionic state (Li + ) in salt lakes, brines and seawater. However, the extraction of lithium source from ore has high requirements on its quality and cost, while brine and seawater have many impurit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M10/0562
CPCH01M10/54H01M10/0562Y02W30/84Y02E60/10
Inventor 徐晶吕文莉邱雅霜
Owner ZHENGZHOU UNIV
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