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Preparation method of ternary positive electrode material precursor and lithium carbonate

A cathode material and precursor technology, which is applied in the field of preparation of ternary cathode material precursors and lithium carbonate, can solve the problems of serious environmental pollution, consumption, and environmental pollution, and achieves simplified process flow, high process added value, and high technological progress. short process effect

Active Publication Date: 2019-07-19
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are problems such as long process flow, large environmental pollution and low economic benefits in the treatment of waste ternary batteries in the traditional acidic system.
For example, the hydrochloric acid leaching method has high equipment corrosion, a large amount of acid mist, and serious environmental pollution; the sulfuric acid leaching method needs to consume more expensive oxidants, and the production cost is higher
The nitric acid leaching method not only consumes a lot of nitric acid, but also produces a large amount of nitrogen oxides, which seriously pollutes the environment
In recent years, although the method of treating waste ternary batteries has been continuously improved, waste ternary batteries are still treated by leaching in an acidic system, which is not friendly to the environment. It can be seen that it is urgent to explore a short process, high value-added, low energy consumption, The method of low-pollution disposal of waste ternary batteries is bound to be of great significance to promote the sustainable development of my country's new energy industry chain and environmental protection

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  • Preparation method of ternary positive electrode material precursor and lithium carbonate
  • Preparation method of ternary positive electrode material precursor and lithium carbonate
  • Preparation method of ternary positive electrode material precursor and lithium carbonate

Examples

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Embodiment 1

[0050] The preparation method of ternary cathode material precursor and lithium carbonate, such as figure 1 shown, including the following steps:

[0051] (1) Recycling waste LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 After the battery is discharged, crushed and calcined, the battery material and the current collector are screened and separated;

[0052] (2) Take 1kg of battery material that has passed through a 200-mesh sieve, first add 45L of ammonia water with a mass fraction of 10%, and 9kg of ammonium chloride, stir for 0.5h, then add 2kg of sodium sulfite and carry out pressure leaching, and control the reaction leaching temperature to 70°C, The reaction leaching time is 5h, the control pressure is 0.3Mpa, and the stirring speed is 200r / min. After three leachings are analyzed by inductively coupled plasma atomic emission spectrometry, a section of leaching solution is obtained by filtering and washing. The leaching rate of nickel is measured to be 99.8%. The leaching rate of cobalt...

Embodiment 2

[0056] The preparation method of ternary cathode material precursor and lithium carbonate, such as figure 1 shown, including the following steps:

[0057] (1) Recycling waste LiNi 0.5 co 0.2 mn 0.3 o 2 Battery discharge, crushing, calcination, screening and separation of battery materials and current collectors;

[0058] (2) Take 1kg of material passed through a 200-mesh sieve; first add 38L of ammonia water with a mass fraction of 10%, 7kg of ammonium chloride, stir for 0.5h, add 1.7kg of sodium sulfite, and then carry out pressure leaching. Control the reaction leaching temperature to 90°C. The leaching time is 9h, the control pressure is 0.5Mpa, and the stirring speed is 300r / min. After the secondary leaching is analyzed by inductively coupled plasma atomic emission spectrometry, a section of leaching solution is obtained by filtering and washing. The leaching rate of nickel is measured to be 99.8%. The leaching rate of cobalt is 99.9%, the leaching rate of manganese i...

Embodiment 3

[0062] The preparation method of ternary cathode material precursor and lithium carbonate, such as figure 1 shown, including the following steps:

[0063] (1) Recycling waste LiNi 0.8 co 0.1 mn 0.1 o 2 Battery discharge, crushing, calcination, screening and separation of battery materials and current collectors;

[0064] (2) Take 1kg of material passed through a 200-mesh sieve; first add 27L of ammonia water with a mass fraction of 10%, 5kg of ammonium chloride, stir for 0.5h, add 1.4kg of ammonium sulfite, and then carry out pressure leaching, and control the reaction leaching temperature to 50°C , The reaction leaching time is 1h, the control pressure is 0.1Mpa, and the stirring speed is 100r / min. After one leaching is analyzed by inductively coupled plasma atomic emission spectrometry, a section of leaching solution is obtained by filtering and washing, and the leaching rate of nickel is measured to be 98.5%. , the leaching rate of cobalt is 97.0%, the leaching rate of...

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Abstract

The invention relates to a preparation method of a ternary material precursor and lithium carbonate. The preparation method comprises the following steps: (1) discharging a waste ternary battery, conducting crushing and calcining, and screening and separating a battery material from a current collector; (2) carrying out reduction pressure leaching on the screened battery material by adopting an ammonia-containing solution as a leaching agent and a sulfite as a reducing agent, and conducting filtering and washing to obtain a first-stage leachate; (3) adding an alkaline substance into the first-stage leachate, conducting heating to boil, carrying out solid-liquid separation after complete precipitation to prepare a ternary material precursor and generate a second-stage leachate and ammonia gas; and (4) adding a saturated sodium carbonate solution into the second-stage leachate, preparing crude lithium carbonate by adopting an evaporation lithium deposition process, conducting deamination, membrane treatment and freezing crystallization on generated wastewater, then recycling ammonia gas to the step (2) to be used as a leaching agent for recycling, and enabling treated regenerated water to meet the recycling requirement. The preparation method disclosed by the invention has the characteristics of low energy consumption, short process, high added value, environmental friendliness and the like.

Description

technical field [0001] The invention relates to the field of non-ferrous metals, in particular to a ternary cathode material precursor and a preparation method for lithium carbonate. Background technique [0002] In recent years, in order to reduce the excessive dependence on traditional petrochemical energy and improve the urban air pollution caused by vehicle exhaust, many governments have formulated a timetable for stopping the production and sales of traditional energy vehicles and at the same time vigorously develop new energy industries. At present, my country's Ministry of Industry and Information Technology has also launched relevant research and will work with relevant departments to formulate my country's timetable. These measures will effectively promote the development of my country's new energy vehicle industry. [0003] Lithium-ion batteries with ternary materials as the positive electrode are widely used in new energy vehicles due to their superior energy dens...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01D15/08
CPCC01D15/08C01G53/006C01P2002/72C01P2004/03C01P2006/40
Inventor 张佳峰孟奎张宝欧星张建永
Owner CENT SOUTH UNIV