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Method for preparing lithium cobalt phosphate from waste lithium cobalt oxide

An old technology of lithium cobalt oxide and lithium cobalt phosphate is applied in the field of preparing lithium cobalt phosphate, which can solve the problems of reduced cycle life, unstable structure and harm of lithium cobalt oxide, so as to ensure the coating effect, reduce BET, and improve ionic conductivity. sexual effect

Inactive Publication Date: 2020-08-14
蒋达金
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process is very harmful, because the scrapped lithium cobalt oxide structure has collapsed, and the structure is extremely unstable. Direct or doped use will greatly reduce the cycle life of lithium cobalt oxide.

Method used

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  • Method for preparing lithium cobalt phosphate from waste lithium cobalt oxide
  • Method for preparing lithium cobalt phosphate from waste lithium cobalt oxide
  • Method for preparing lithium cobalt phosphate from waste lithium cobalt oxide

Examples

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Comparison scheme
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Embodiment 1

[0044] A method for preparing lithium cobalt phosphate by using waste lithium cobaltate, comprising the following steps:

[0045] (1) Disassemble the waste lithium cobalt oxide battery, take out the positive electrode, add lye, react at a temperature of 40°C for 2 hours, and then filter to obtain the filtrate and filter residue, wash the filter residue, dry it, and then airflow crush it Sieve and electromagnet to remove magnetic foreign matter to obtain lithium cobaltate material;

[0046] (2) After mixing lithium cobaltate, ammonium dihydrogen phosphate, nano-titanium hydroxide and nano-tin hydroxide, the molar ratio of lithium cobaltate, ammonium dihydrogen phosphate, nano-titanium hydroxide and nano-tin hydroxide is 1:1.01 :0.01:0.005, put it into a high-energy ball mill for ball milling, the ball milling time is 30min, the ball milling is until the particle size of the powder is 400nm, then take out the mixture, put the mixture into the rotary kiln, and feed the mixed gas ...

Embodiment 2

[0059] A method for preparing lithium cobalt phosphate by using waste lithium cobaltate, comprising the following steps:

[0060] (1) Disassemble the waste lithium cobalt oxide battery, take out the positive electrode, add lye, react at a temperature of 60°C for 3 hours, and then filter to obtain the filtrate and filter residue, wash the filter residue, dry it, and then airflow crush it Sieve and electromagnet to remove magnetic foreign matter to obtain lithium cobaltate material;

[0061] (2) After mixing lithium cobaltate, ammonium dihydrogen phosphate, nano-titanium hydroxide and nano-tin hydroxide, the molar ratio of lithium cobaltate, ammonium dihydrogen phosphate, nano-titanium hydroxide and nano-tin hydroxide is 1:1.02 :0.03:0.01, put it into a high-energy ball mill for ball milling, the ball milling time is 60min, the ball milling until the particle size of the powder is 300nm, then take out the mixed material, put the mixed material into the rotary kiln, and feed the ...

Embodiment 3

[0074] A method for preparing lithium cobalt phosphate by using waste lithium cobaltate, comprising the following steps:

[0075] (1) Disassemble the waste lithium cobalt oxide battery, take out the positive electrode, add lye, react at a temperature of 50°C for 2.5 hours, then filter to obtain the filtrate and filter residue, wash the filter residue, dry it, and then airflow crush it After screening and electromagnet to remove magnetic foreign matter, lithium cobalt oxide material is obtained;

[0076] (2) After mixing lithium cobaltate, ammonium dihydrogen phosphate, nano-titanium hydroxide and nano-tin hydroxide, the molar ratio of lithium cobaltate, ammonium dihydrogen phosphate, nano-titanium hydroxide and nano-tin hydroxide is 1:1.015 :0.02:0.0075, put it into a high-energy ball mill for ball milling, the ball milling time is 50min, the ball milling until the particle size of the powder is 350nm, then take out the mixed material, put the mixed material into the rotary ki...

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Abstract

The invention discloses a method for preparing lithium cobalt phosphate from waste lithium cobalt oxide. The method comprises the following steps: disassembling the waste lithium cobalt oxide battery,taking out a positive plate, adding alkali liquor, filtering, washing filter residues, drying, carrying out jet milling, screening, and removing magnetic foreign matters by using an electromagnet toobtain a lithium cobalt oxide material; mixing lithium cobalt oxide, ammonium dihydrogen phosphate, nano titanium hydroxide and nano tin hydroxide, carrying out ball milling, taking out to obtain a mixture, and calcining the mixture in a rotary kiln to obtain a primary calcined material; adding glucose, conductive graphite and a phosphoric acid solution into the primary calcined material, grinding, performing spray drying to obtain a spray-dried material, and calcining the spray-dried material in a roller bed furnace to obtain a secondary calcined material; and crushing, screening, removing magnetic substances by an electromagnet, and packaging in vacuum to obtain the product. The method for preparing lithium cobalt phosphate from waste lithium cobalt oxide has the advantages of high addedvalue of the product, low cost, less wastewater generation amount, short flow and excellent electrical properties of lithium cobalt phosphate.

Description

technical field [0001] The invention relates to a method for preparing lithium cobalt phosphate by using waste lithium cobalt oxide, which belongs to the technical field of new energy. Background technique [0002] The working voltage of lithium cobalt phosphate material can reach 4.8V, and the capacity can reach 170mAh / g. It has the same crystal structure as lithium iron phosphate, and they are all ordered olivine structures. They belong to the orthorhombic crystal system, the space group is Pmnb, and the unit cell The parameters are a=0.5922nm, b=1.0202nm, c=0.4699nm. In the crystal, O atoms are hexagonally close-packed, P atoms occupy tetrahedral gaps, and Li atoms and Co atoms occupy octahedral gaps. Octahedral CoO with edge sharing 6 Pass PO in the same direction as the C axis 4 The tetrahedra are linked into chains. Since the crystal structure is stabilized by the Co-O-P bonds, the Li + During the extraction process, the crystal rearrangement is very small and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/54
CPCC01B25/45C01P2004/03C01P2004/61C01P2004/62C01P2006/11C01P2006/12C01P2006/40H01M4/5825H01M10/54Y02E60/10Y02W30/84
Inventor 蒋达金
Owner 蒋达金