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

A ternary lithium battery and positive electrode material technology, which is applied in battery recycling, recycling technology, waste collector recycling, etc., can solve the problems of low recovery efficiency of positive electrode materials, and achieve good industrial application prospects and short-process recycling and reuse. Effect

Active Publication Date: 2019-01-11
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 prepare a positive electrode material precursor by using waste ternary lithium battery
  • A method for prepare a positive electrode material precursor by using waste ternary lithium battery
  • A method for prepare a positive electrode material precursor by using waste ternary lithium battery

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Embodiment 1

[0054] The old NCM721 (LiNi 0.7 Co 0.2 Mn 0.1 O 2 ) The ternary lithium battery is placed in a 2 mol / L sodium chloride solution for 36 hours. The battery is manually disassembled to separate the positive aluminum foil, negative copper foil, casing, diaphragm, tabs, etc. Place the positive electrode aluminum foil in a 1 mol / L sodium hydroxide solution, then peel off the positive electrode material, and wash the stripped positive material with 1 mol / L sodium hydroxide solution. Then put it in a drying oven at 80 ℃ and dry for 12 h. It was calcined in a box furnace at 600 ℃ for 6 hours, and the furnace was cooled to room temperature, and the furnace was taken out and placed in a mortar to grind and filtered with a 200-mesh sieve to obtain waste ternary lithium battery cathode material powder. Then weigh 53g of the cathode material powder into the autoclave, add the total ammonium concentration of 8 mol / L, n(NH 3 ): n(NH 4+ ) = 800 mL of a 2:1 mixed solution of ammonium sulfate and...

Embodiment 2

[0057] Place the used NCA ternary lithium battery in a 2 mol / L sodium chloride solution for 36 hours. Disassemble the battery manually to separate the positive aluminum foil, negative copper foil, casing, diaphragm, tabs, etc. Place the positive aluminum foil in a 1 mol / L sodium hydroxide solution, then peel off the positive electrode material, and wash the stripped positive material with 2 mol / L sodium hydroxide solution. Then put it in a drying oven at 90 ℃ and dry for 12 h. It was calcined in a box furnace at 600 ℃ for 6 h, and the furnace was cooled to room temperature. The furnace was taken out and placed in a mortar to grind and filtered with a 300-mesh sieve to obtain waste ternary lithium battery cathode material powder. Then weigh 53g of the cathode material powder into the autoclave, add the total ammonium concentration of 7.5 mol / L, n(NH 3 ): n(NH 4+ ) = 800mL of a 2:1 mixed solution of ammonium sulfate and ammonia; then add sodium sulfite as a reducing agent, and th...

Embodiment 3

[0060] The old NCM622 (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) The ternary lithium battery is placed in a 2 mol / L sodium chloride solution for 36 hours. The battery is manually disassembled to separate the positive aluminum foil, negative copper foil, casing, diaphragm, tabs, etc. Place the positive electrode aluminum foil in a 1 mol / L sodium hydroxide solution, then peel off the positive electrode material, and wash the stripped positive material with 1 mol / L sodium hydroxide solution. Then put it in a drying oven at 80 ℃ and dry for 12 h. It was calcined in a box furnace at 700 ℃ for 2 h, and the furnace was cooled to room temperature. The furnace was taken out and placed in a mortar to grind and filtered with a 500-mesh sieve to obtain waste ternary lithium battery cathode material powder. Then weigh 100g of the cathode material powder into the autoclave, add the total ammonium concentration of 12 mol / L, n(NH 3 ): n(NH 4+ ) = 1.5:1 ammonium chloride and ammonia water mixed solution 100...

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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 waste ternary lithium battery recovery, in particular to a method for preparing a precursor of a positive electrode material by using a waste ternary lithium battery. 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 used batteries has risen sharply. Some studies predict that by 2020, the scrap volume of power lithium batteries will reach 32.2Gwh, about 500,000 tons, and by 2023, the scrap volume 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, their market share reached 44.71% and 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...

Claims

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Application Information

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Patent Type & Authority Applications(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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