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Waste battery lithium resource recovery method based on solid electrolyte

A solid-state electrolyte, waste battery technology, used in battery recycling, waste collector recycling, secondary batteries, etc., can solve the problems of high impurities, high energy consumption at high temperature, slow kinetic rate, etc., and achieve high-purity lithium resource recovery. , the effect of improving lithium recovery efficiency and compensating for cost consumption

Active Publication Date: 2021-09-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Waste battery lithium resource recovery method based on solid electrolyte
  • Waste battery lithium resource recovery method based on solid electrolyte
  • Waste battery lithium resource recovery method based on solid electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the method for recovering lithium resources from waste batteries based on solid electrolytes 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 amount of P3HT powder in carbon disulfide solution, wherein the ratio of P3HT powder to carbon disulfide solution is 12mg / ml, and make a modified solution after sealing and stirring, and then 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, a waterproof coating will be formed on the surface of the LLZTO;

[0025] S2. In the glove box, wet the electrode sheet of the waste battery taken out through the lithium ion electrolyte for use. The lithium ion electrolyte is 1M lithium hexafluorophosphate dissolved in ethylene carbonate with a volume ratio of 1:1, mixed with diethyl carb...

Embodiment 2

[0033] In the method for recovering lithium resources from waste batteries based on solid electrolytes in this 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 amount of P3HT powder in chloroform solution, wherein the ratio of P3HT powder to chloroform solution is 22mg / ml, and make a modified solution after sealing and stirring, and then 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, a waterproof coating will be formed on the surface of the LLZTO;

[0035] S2. In the glove box, wet the electrode sheet of the waste battery taken out through the lithium ion electrolyte for use. The lithium ion electrolyte is 1M lithium hexafluorophosphate dissolved in ethylene carbonate with a volume ratio of 1:1, mixed with diethyl carbonate;

[0036] S3, in the glove box...

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Abstract

The invention discloses a waste battery lithium resource recovery method based on a solid electrolyte. The method is characterized in that under the driving of an external electric field, Li < + > embedded in an anode electrode can be extracted through high selectivity of LLZTO, and is recovered in the form of LiOH, and H2 is collected at the same time. Besides, P3HT modification is carried out on the surface of the LLZTO so that the use performance of the LLZTO in an aqueous solution is successfully expanded, H < + > / Li < + > exchange between water and the LLZTO is prevented, and lithium resources can be extracted from waste batteries. Based on the condition, the strategy has proved that nondestructive, repeatable and high-purity lithium resource recovery from various waste lithium ion batteries can be realized.

Description

technical field [0001] The invention relates to the technical field of waste battery recycling, 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. Compared with other solid elements, lithium has the lowest redox potential (-3.045V vs standard hydrogen electrode) and the highest theoretical specific capacity (3870mAh / g), 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, lithium carbonate (Li 2 CO 3 ) exists in spodumene and lepidolite in the form of ions (Li + ) exist in salt lakes, brines and seawater. However, the extraction of lithium sources from ores requires high quality and cost, while brine and seawater contain many impurities and low lithium c...

Claims

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Application Information

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Patent Type & Authority Applications(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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