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Method for preparing lithium-rich solution and manganese dioxide by using spent lithium manganese phosphate

A technology of lithium manganese phosphate and manganese dioxide, applied in manganese oxide/manganese hydroxide, recycling technology, lithium carbonate;/acid carbonate, etc., can solve problems such as limiting battery energy density and achieve shortening Cleaning time, achieving recycling, avoiding pollution

Active Publication Date: 2020-06-09
安徽南都华铂新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the widely used lithium iron phosphate potential of 3.4V limits the improvement of battery energy density, while lithium manganese phosphate has a high potential of 4.1V

Method used

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  • Method for preparing lithium-rich solution and manganese dioxide by using spent lithium manganese phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, first dissolving the invalid lithium manganese phosphate in the sodium persulfate solution, the oxidative acidification slurry is obtained through the oxidation reaction; then the lithium-rich solution and the manganese carbon residue are obtained through filtration, and the manganese carbon residue is a mixture of manganese dioxide and carbon; The lithium-rich solution is purified to obtain a lithium-rich purification solution, and the lithium-rich purification solution is precipitated with a sodium carbonate solution to obtain lithium carbonate; the manganese carbon residue is roasted at 750°C in an oxygen atmosphere to obtain manganese dioxide. The impurity removal operation is to use sodium hydroxide to adjust the pH value of the lithium-rich solution to 8 to remove a small amount of manganese ions, and then use sodium hydroxide to adjust the pH value to 11.

Embodiment 2

[0024] Such as figure 1 As shown, first dissolving the invalid lithium manganese phosphate in the sodium persulfate solution, the oxidative acidification slurry is obtained through the oxidation reaction; then the lithium-rich solution and the manganese carbon residue are obtained through filtration, and the manganese carbon residue is a mixture of manganese dioxide and carbon; The lithium-rich solution is purified to obtain a lithium-rich purified solution, and the lithium-rich purified solution is precipitated with a sodium carbonate solution to obtain lithium carbonate; the manganese carbon residue is roasted at 700°C in an oxygen atmosphere to obtain manganese dioxide. The impurity removal operation is to use sodium hydroxide to adjust the pH value of the lithium-rich solution to 8 to remove a small amount of manganese ions, and then use sodium hydroxide to adjust the pH value to 11.

Embodiment 3

[0026] Such as figure 1 As shown, first dissolving the invalid lithium manganese phosphate in the sodium persulfate solution, the oxidative acidification slurry is obtained through the oxidation reaction; then the lithium-rich solution and the manganese carbon residue are obtained through filtration, and the manganese carbon residue is a mixture of manganese dioxide and carbon; The lithium-rich solution is purified to obtain a lithium-rich purified solution, and the lithium-rich purified solution is precipitated with a sodium carbonate solution to obtain lithium carbonate; the manganese carbon residue is roasted at 700°C in an oxygen atmosphere to obtain manganese dioxide. The impurity removal operation is to use sodium hydroxide to adjust the pH value of the lithium-rich solution to 8 to remove a small amount of manganese ions, and then use sodium hydroxide to adjust the pH value to 11.

[0027] The oxidation reaction is completed in a stainless steel container. After the rea...

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Abstract

The invention discloses a method for preparing a lithium-enriched solution and manganese dioxide by utilizing failed lithium manganese phosphate and relates to the technical field of lithium manganesephosphate material recycling. The method comprises the following steps: dissolving the failed lithium manganese phosphate into an oxidizing acid solution, and carrying out an oxidizing reaction to obtain oxidizing acid slurry; filtering to obtain the lithium-enriched solution and a manganese carbon residue, wherein the manganese carbon residue is a mixture of manganese dioxide and carbon; removing impurities from the lithium-enriched solution to obtain a lithium-enriched purification liquid, and precipitating the lithium-enriched purification liquid with sodium carbonate so as to obtain lithium carbonate; calcining the manganese carbon residue in an oxygen atmosphere, so as to obtain the manganese dioxide. According to the method disclosed by the invention, the failed lithium manganese phosphate is recycled, and environmental pollution and resource waste caused by direct scrap of the failed lithium manganese phosphate can be avoided.

Description

Technical field: [0001] The invention relates to the technical field of recycling lithium manganese phosphate materials, in particular to a method for preparing lithium-rich solution and manganese dioxide by using spent lithium manganese phosphate. Background technique: [0002] Like lithium iron phosphate batteries, lithium manganese phosphate also belongs to the positive electrode material of phosphate-based lithium battery with olivine structure. The safety and cycle life of this material are higher than those of traditional layered structure positive electrode materials such as lithium cobalt oxide and ternary materials. . However, the widely used lithium iron phosphate potential of 3.4V limits the improvement of battery energy density, while lithium manganese phosphate has a high potential of 4.1V. Therefore, under the same capacity, the energy density of lithium manganese phosphate battery can be increased by about 20% compared with lithium iron phosphate battery. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08H01M10/54C01G45/02
CPCC01D15/08C01G45/02H01M10/54Y02W30/84
Inventor 朱建楠
Owner 安徽南都华铂新材料科技有限公司
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