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High-performance small-particle-size ternary positive electrode material precursor and preparation method thereof

A positive electrode material and small particle size technology, which is applied in the field of high-performance small particle size ternary positive electrode material precursor and its preparation, can solve the problems of difficult mixing, poor electrochemical performance, and slow solid phase diffusion speed. Achieve good sphericity, ensure purity and integrity, improve safety performance and cycle performance

Active Publication Date: 2018-08-03
宁夏中色金辉新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to stabilize the structure and improve performance, researchers at home and abroad have found that the application of bulk phase doping substitution and surface coating can improve the performance of materials, such as Chinese patent ZL201110222403.7 "Preparation method of doping aluminum in positive electrode material of lithium electronic battery by solid phase method" The positive electrode material prepared by doping aluminum by the solid-state method can improve the high-temperature safety performance and cycle characteristics of lithium-ion batteries. There are large differences in other aspects, resulting in poor electrochemical performance

Method used

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  • High-performance small-particle-size ternary positive electrode material precursor and preparation method thereof
  • High-performance small-particle-size ternary positive electrode material precursor and preparation method thereof
  • High-performance small-particle-size ternary positive electrode material precursor and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Prepare 3μmNi 0.25 co0.30 mn 0.30 Ca 0.05 (OH) 2 Ternary cathode material precursor.

[0028] (1) Nickel sulfate, cobalt sulfate, manganese sulfate, calcium sulfate, sodium hydroxide, and ammonia water are used as reaction raw materials to prepare 1.8mol / L nickel-cobalt-manganese metal salt solution at 30~35°C (the ratio of nickel-cobalt-manganese-calcium is 0.25:0.30:0.30:0.05), 6mol / L sodium hydroxide solution, 10mol / L ammonia water, after passing the feed liquid through precision filtration and demagnetization device respectively, put it into the feed liquid tank for standby.

[0029] (2) Add 800L of pure water to the 2000L reactor to submerge the reaction paddles, and feed N 2 Protection, flow rate 20L / min, stirring speed 100r / min and stirring for 30min, add sodium hydroxide solution to the bottom liquid, adjust pH to 12.0, continue stirring for 60min, control stirring speed 500r / min, and add ammonia water 20L into the kettle. After the ammonia water is added, ...

Embodiment 2

[0031] Prepare 3μmNi 0.37 co 0.30 mn 0.30 Mg 0.03 (OH) 2 Ternary cathode material precursor.

[0032] (1) Nickel chloride, cobalt chloride, manganese chloride, magnesium chloride, sodium hydroxide, and ammonia water are used as reaction raw materials, and 1.5mol / L nickel-cobalt-manganese metal salt solution (nickel-cobalt-manganese The calcium ratio is 0.37:0.30:0.30:0.03), 4mol / L sodium hydroxide solution, and 8mol / L ammonia water. After the feed liquid is passed through a precision filter and a demagnetization device, it is poured into the feed liquid tank for standby.

[0033] (2) Add 800L of pure water to the 2000L reactor to submerge the reaction paddles, and feed N 2 Protection, flow rate 20L / min, stirring speed 100r / min, stir for 30min, add sodium hydroxide solution to the bottom liquid, adjust the pH to 12.2, continue stirring for 60min, control the speed to 500r / min, and add ammonia water 20L into the kettle. After the ammonia water is added, add the nickel-coba...

Embodiment 3

[0035] Prepare 3μmNi 0.62 co 0.20 mn 0.15 Ca 0.03 (OH) 2 Ternary cathode material precursor.

[0036] (1) Nickel sulfate, cobalt sulfate, manganese sulfate, calcium sulfate, sodium hydroxide, and ammonia water are used as reaction materials to prepare 2mol / L nickel-cobalt-manganese metal salt solution at 35~40°C (the ratio of nickel-cobalt-manganese-calcium is 0.62 :0.20:0.15:0.03), 6mol / L sodium hydroxide solution, 8mol / L ammonia water, after passing the feed liquid through precision filtration and demagnetization device respectively, pour it into the feed liquid tank for standby.

[0037] (2) Add 600L of pure water to the 2000L reactor to submerge the reaction paddles, and pass in N 2 Protection, flow rate 20L / min, stirring speed 100r / min, stirring for 30min, adding sodium hydroxide solution to the bottom liquid, adjusting the pH to 12.0~12.1, continuing to stir for 60min, increasing the stirring speed to 300r / min, and adding Ammonia water 28L. After adding the ammoni...

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Abstract

The invention provides a high-performance small-particle-size ternary positive electrode material precursor and a preparation method thereof, belonging to the technical field of positive electrode materials for lithium batteries. The precursor has a general chemical formula of NiCoMn<c>M<d>(OH)<2>, wherein M is one or more doping elements selected from the group consisting of calcium, magnesium, copper, aluminum, titanium, tantalum and niobium. The preparation method comprises the following steps: (1) preparation of a metal salt solution; (2) preparation of a complexing agent and a precipitating agent: preparing ammonia water with a concentration controlled to be 3 mol / L to 10 mol / L as the complexing agent; and (3) synthesis of the precursor. According to the high-performance small-particle-size ternary positive electrode material precursor in the invention provides, through element doping, detection and adjustment of feed concentrations and element contents with instruments andsubsequent treatment with a precise filter and a demagnetizing device, element distribution is made more uniform and accurate and the content of impurities and magnetic foreign matters in particles islower; so the purity and integrity of the crystal structure of the produced precursor are ensured, and the safety performance and cycle performance of the precursor are improved.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium batteries, and in particular relates to a high-performance and small particle size ternary cathode material precursor and a preparation method thereof. Background technique [0002] New energy vehicles, as an emerging strategic industry that is the country's key development, have entered the incubation period of rapid development. It is urgent to solve the mileage, safety and cycle life of batteries. The existing battery cathode materials include lithium iron phosphate, spinel lithium manganese oxide, nickel cobalt lithium manganate ternary materials, due to the theoretical grams of lithium iron phosphate (169.9mAh / g) and lithium manganate (148.2mAh / g) The low capacity cannot meet the increasing battery life requirements, and will gradually be replaced by nickel-cobalt-lithium-manganese-oxide ternary materials (276.8 mAh / g) with high gram capacity. [0003] Obviously, lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/58
CPCH01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 李少龙文荣米玺学贾效旭李志林吴靖李鹏沈立芳魏宁刘娟王耀玺路文义
Owner 宁夏中色金辉新能源有限公司
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