A method for preparing positive electrode material precursor by using waste ternary lithium battery

A ternary lithium battery and cathode material technology, applied in battery recycling, recycling technology, waste collector recycling, etc., can solve the problem of low cathode material recycling efficiency, achieve good industrial application prospects, short-process recycling and reuse Effect

Active Publication Date: 2020-04-07
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for preparing positive electrode material precursors using waste ternary lithium batteries, aiming to solve the problem of low recovery efficiency of positive electrode materials in existing waste ternary lithium batteries

Method used

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  • A method for preparing positive electrode material precursor by using waste ternary lithium battery
  • A method for preparing positive electrode material precursor by using waste ternary lithium battery
  • A method for preparing positive electrode material precursor by using waste ternary lithium battery

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Embodiment 1

[0054] The waste NCM721 (LiNi 0.7 co 0.2 mn 0.1 o 2 ) The ternary lithium battery was placed in a 2 mol / L sodium chloride solution for 36 hours, and the battery was manually disassembled to separate the positive aluminum foil, negative copper foil, shell, diaphragm, and tabs. Put the positive electrode aluminum foil in 1 mol / L sodium hydroxide solution, then peel off the positive electrode material, and wash the peeled positive electrode material with 1 mol / L sodium hydroxide solution. Then put it in a drying oven at 80 °C for 12 h. And put it into a box-type furnace for calcination at 600 °C for 6 hours, cool it to room temperature in the furnace, take it out, put it in a mortar, grind it, and filter it with a 200-mesh sieve to obtain the spent ternary lithium battery cathode material powder. Then weigh 53g of positive electrode material powder and put it into the autoclave, add total ammonium concentration of 8 mol / L, n(NH 3 ) : n(NH 4+ )=2:1 ammonium sulfate and ammon...

Embodiment 2

[0057] The waste NCA ternary lithium battery was placed in 2 mol / L sodium chloride solution for 36 hours, and the battery was manually disassembled to separate the positive aluminum foil, negative copper foil, shell, diaphragm, and tabs. Put the positive electrode aluminum foil in 1 mol / L sodium hydroxide solution, then peel off the positive electrode material, and wash the peeled positive electrode material with 2 mol / L sodium hydroxide solution. Then placed in a drying oven at 90 °C for 12 h. And put it into a box-type furnace for calcination at 600 °C for 6 h, cool it to room temperature in the furnace, take it out, put it into a mortar, grind it, and filter it with a 300-mesh sieve to obtain the positive electrode material powder of the waste ternary lithium battery. Then take 53g of positive electrode material powder and put it into the autoclave, add the total ammonium concentration to be 7.5 mol / L, n(NH 3 ) : n(NH 4+ )=2:1 ammonium sulfate and ammonia water mixed solu...

Embodiment 3

[0060] The waste NCM622 (LiNi 0.6 co 0.2 mn 0.2 o 2 ) The ternary lithium battery was placed in a 2 mol / L sodium chloride solution for 36 hours, and the battery was manually disassembled to separate the positive aluminum foil, negative copper foil, shell, diaphragm, and tabs. Put the positive electrode aluminum foil in 1 mol / L sodium hydroxide solution, then peel off the positive electrode material, and wash the peeled positive electrode material with 1 mol / L sodium hydroxide solution. Then put it in a drying oven at 80 °C for 12 h. And put it into a box-type furnace for calcination at 700 °C for 2 hours, cool it to room temperature in the furnace, take it out, put it into a mortar, grind it, and filter it with a 500-mesh sieve to obtain the positive electrode material powder of the waste ternary lithium battery. Then take 100g of positive electrode material powder and put it into the autoclave, add the total ammonium concentration of 12 mol / L, n(NH 3 ) : n(NH 4+ ) = 1.5...

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Abstract

The invention provides a method for preparing a positive electrode material precursor by using a waste ternary lithium battery, which adopts a first stage leaching as a pressurized ammonia leaching torealize simultaneous recovery of lithium, nickel and cobalt. The second stage leaching is atmospheric pressure acid leaching to realize the recovery of doped metal (manganese or aluminum). The invention realizes low cost of waste ternary positive electrode material, Short-process recovery and reuse, in which nickel is leached by ammonia under pressure, the comprehensive leaching rate of valuablemetals such as cobalt and lithium reaches 92%. The comprehensive recovery of valuable metals such as nickel, cobalt, lithium, manganese and aluminum is over 95% by two-stage leaching. Ammonia and leaching acid can be recycled in closed circuit. The precursor of ternary positive electrode materials prepared by regeneration can meet the needs of preparation of different series of ternary positive electrode materials, and has a good prospect of industrial application.

Description

technical field [0001] The invention relates to the technical field of recycling waste ternary lithium batteries, in particular to a method for preparing a positive electrode material precursor by using waste ternary lithium batteries. Background technique [0002] With the rapid development of electric vehicles and energy storage, the demand and output of lithium batteries have surged, and the number of waste batteries has risen sharply. Some studies predict that by 2020, the scrapped power lithium battery will reach 32.2Gwh, about 500,000 tons, and by 2023, the scrapped amount will reach 101Gwh, about 1.16 million tons. Due to its excellent performance, ternary lithium-ion batteries have become the mainstream technology of current lithium-ion batteries. In 2017, its market share reached 44.71%. It is expected to become the main component of waste batteries in the future. Ternary lithium-ion batteries usually contain 5% to 20% cobalt, 5% to 10% nickel, 5% to 7% lithium, 15...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/008H01M10/54Y02P10/20Y02W30/84
Inventor 林艳段建国张英杰宁培超崔焱董鹏徐明丽王丁
Owner KUNMING UNIV OF SCI & TECH
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