Multistage reaction system, lithium ion multi-element positive electrode material precursor, preparation method of lithium ion multi-element positive electrode material precursor and preparation method of lithium ion multi-element positive electrode material

A multi-stage reaction and reaction system technology, applied in chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problems of complicated process, poor improvement effect, wide particle size distribution, etc., and achieve controllable particle size. The effect of uniformity, improved structural stability, and improved cycle performance

Active Publication Date: 2021-01-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Description
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  • Application Information

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Problems solved by technology

[0004] However, subject to the strict production conditions of this process, there are shortcomings such as the growth of early crystal particles is too fast and too large, the particle size distribution of the final prepared precursor particles is wide, and the particle tap density is low.
For example, CN108054371A discloses a preparation method of a lithium-rich manganese-based positive electrode material, and adopts a co-precipitation method to prepare a precursor of a lithium-rich manganese-based material. However, the precursors obtained by the co-precipitation method have the above-mentioned problems (the particle size distribution is wi...

Method used

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  • Multistage reaction system, lithium ion multi-element positive electrode material precursor, preparation method of lithium ion multi-element positive electrode material precursor and preparation method of lithium ion multi-element positive electrode material
  • Multistage reaction system, lithium ion multi-element positive electrode material precursor, preparation method of lithium ion multi-element positive electrode material precursor and preparation method of lithium ion multi-element positive electrode material
  • Multistage reaction system, lithium ion multi-element positive electrode material precursor, preparation method of lithium ion multi-element positive electrode material precursor and preparation method of lithium ion multi-element positive electrode material

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preparation example Construction

[0117] The present invention provides a preparation method of a lithium ion multi-element cathode material precursor, which is prepared by using the multi-stage reaction system described in the above technical scheme, and specifically includes the following steps:

[0118] a) the material in the raw material tank is sent to the salt preparation kettle, and mixed in the salt preparation kettle to obtain a mixed salt solution;

[0119] b) the mixed salt solution in the salt preparation kettle is sent to the primary reaction kettle, and meanwhile, the ingredients in the batching tank are sent to the primary reaction kettle, and under stirring conditions, the mixed salt solution and the ingredients are in the primary reaction kettle. Carry out coprecipitation reaction in the reactor;

[0120] c) in the process of described co-precipitation reaction, the supernatant liquid in the primary reaction kettle is drawn out by the liquid extraction kettle, and the material in the primary r...

Embodiment 1

[0167] 1.1 Preparation

[0168] S1, according to the target product Li (Li 0.5 Ni 0.25 co 0.15 mn 0.6 Mg 0.05 )O 2 Molar ratio among, take quantitative nickel sulfate, cobalt sulfate and manganese sulfate respectively, and additive magnesium sulfate, stir respectively and dissolve in deionized water to form nickel sulfate solution, cobalt sulfate solution, manganese sulfate solution and additive solution;

[0169] Add the above-mentioned materials dropwise to the salt mixing kettle 2 through nickel salt solution tank 1a, cobalt salt solution tank 1b, manganese salt solution tank 1c, and additive solution tank 1d respectively, at a rate of 50 mL / min. Stir and mix in the salt mixing kettle 2 to prepare a 2mol / L mixed salt solution.

[0170] S2. Preparation of ingredients:

[0171] Preparation of precipitant solution: Dissolve sodium carbonate in deionized water with stirring to prepare 2mol / L sodium carbonate solution.

[0172] Preparation of complexing agent solution: t...

Embodiment 2

[0186] 1.1 Preparation

[0187] S1, according to the target product Li (Li 0.4 Ni 0.13 Co 0.09 Mn 0.5 Al 0.08 )O 2 In the molar ratio, respectively weigh quantitative nickel sulfate, cobalt sulfate and manganese sulfate, and additive ammonium aluminate, stir and dissolve in deionized water to form nickel sulfate solution, cobalt sulfate solution, manganese sulfate solution and additive solution;

[0188] According to step S1 of Example 1, the transmission material is added dropwise, and the mixture is stirred and mixed in the salt preparation kettle 2 to prepare a 2 mol / L mixed salt solution.

[0189] S2, preparation ingredients:

[0190] Preparation of precipitant solution: Dissolve sodium carbonate in deionized water with stirring to prepare a 2mol / L sodium carbonate solution.

[0191] Preparation of complexing agent solution: take ammonia water with a concentration of 25%, dilute with deionized water, and prepare a complexing agent solution with a concentration of 16...

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Abstract

The invention provides a multistage reaction system, a lithium ion multi-element positive electrode material precursor, a preparation method of the lithium ion multi-element positive electrode material precursor and a preparation method of a lithium ion multi-element positive electrode material. According to the multi-stage reaction system provided by the invention, two stages of reaction kettlesare arranged, a circulating device is arranged between the two stages of reaction kettles, the multi-element positive electrode material precursor prepared by the system and the preparation method iscontrollable and uniform in particle size, regular in morphology and high in tap density, and the structural stability of the positive electrode material can be improved; the primary particle interlayer spacing of the positive electrode material precursor is reduced, the specific surface area of the material is increased, and the tap density of the material is improved; and meanwhile, the processreduces the interface internal resistance of the positive electrode material in the circulation process, so that the electrochemical performance, especially the circulation performance and the rate capability, of the material are improved, the energy density of the lithium ion battery is improved, and the process is suitable for industrial batch production.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a multi-stage reaction system, a lithium ion multi-element positive electrode material precursor and a preparation method thereof, and a preparation method of the lithium ion multi-element positive electrode material. Background technique [0002] As a secondary battery, lithium-ion batteries have been maturely commercialized in the field of small power batteries such as 3C electronic products, mobile power supplies, power tools and electric bicycles. The cathode materials used mainly include lithium iron phosphate, lithium manganate, and lithium cobalt oxide. And ternary materials, etc., the actual specific capacity is lower than 200mA h / g. With the change of the global energy pattern and the limited supply of nickel-cobalt-manganese resources, lithium-rich manganese-based cathode materials with high specific capacity (>250 mA h / g) and low cost have attracted exte...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M4/485H01M10/0525C01P2002/72C01P2004/03C01P2004/61C01P2006/11C01P2006/40Y02E60/10
Inventor 顾庆文赛喜雅勒图王雪莹刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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