Preparation method of nickel cobalt lithium manganate ternary positive electrode material

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of poor cycle performance, low compaction density, and low mechanical strength of materials, and achieve high compaction density and hardness , Improve the compressive capacity, improve the effect of Ni-O bond energy

Pending Publication Date: 2022-03-18
WANHUA CHEM (SICHUAN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problems of low compaction density due to low hardness of high-nickel ternary positive electrode materials, and easy generation of microcracks in the cycle process, resulting in low mechanical strength of the material and poor cycle performance. For this reason, the present invention provides a Preparation method of nickel cobalt lithium manganese oxide ternary positive electrode material with high hardness and high compaction density

Method used

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  • Preparation method of nickel cobalt lithium manganate ternary positive electrode material
  • Preparation method of nickel cobalt lithium manganate ternary positive electrode material
  • Preparation method of nickel cobalt lithium manganate ternary positive electrode material

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Embodiment 1

[0049] Weigh NiSO according to the ratio of Ni:Co:Mn:Al molar ratio of 0.8782:0.09:0.03:0.0018 4 ·6H2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O and Al 2 (SO 4 ) 3 , fully dissolved in deionized water to prepare an aqueous solution, control the flow rate, and mix the aqueous solution with NaOH and NH 4 OH was continuously added into the 2.5L reactor, the reaction pH was controlled to be 11-12, the reaction temperature was 50°C, and the stirring rate was 800-1000rpm, and the precursor containing Al (Ni 0.8782 co 0.09 mn 0.03 al 0.0018 )(OH) 2 , the precursor is filtered and dried for use. Lithium hydroxide monohydrate and the above precursors were weighed at a molar ratio of 1.020:1. Mix 30% lithium hydroxide monohydrate and all the precursors evenly, bake at 500° C. for 3 hours in an atmosphere with an oxygen volume concentration of 95%, and cool down naturally to obtain a calcined product. After the calcined product is crushed and sieved, the remaining 70% lithium hydroxid...

Embodiment 2

[0051] Weigh NiSO according to the ratio of Ni:Co:Mn:Al molar ratio of 0.87892:0.09:0.03:0.00108 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O and Al 2 (SO 4 ) 3 , fully dissolved in deionized water to prepare an aqueous solution, control the flow rate, continuously add the aqueous solution, NaOH and NH4OH to a 2.5L reaction kettle, control the reaction pH=11-12, the reaction temperature is 50°C, and the stirring rate is 800-1000rpm. Precursors of Al elements (Ni 0.87892 co 0.09 mn 0.03 al 0.00108 )(OH) 2 , the precursor was filtered and dried before use, and the lithium hydroxide monohydrate and the precursor were weighed at a molar ratio of 1.020:1. Mix 30% lithium hydroxide monohydrate and all the precursors evenly, bake at 500° C. for 3 hours in an atmosphere with an oxygen volume concentration of 95%, and cool down naturally to obtain a calcined product. After the calcined product is crushed and sieved, the remaining 70% lithium hydroxide monohydrate and a certain...

Embodiment 3

[0053] Weigh NiSO according to the ratio of Ni:Co:Mn:Al molar ratio of 0.8764:0.09:0.03:0.0036 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O and Al 2 (SO 4 ) 3 , fully dissolved in deionized water to prepare an aqueous solution, control the flow rate, and mix the aqueous solution with NaOH and NH 4 OH was continuously added into the 2.5L reactor, the reaction pH was controlled to be 11-12, the reaction temperature was 50°C, and the stirring rate was 800-1000rpm, and the precursor containing Al (Ni 0.8764 co 0.09 mn 0.03 al 0.0036 )(OH) 2 , the precursor is filtered and dried for use. Lithium hydroxide monohydrate and precursor were weighed at a molar ratio of 1.020:1. Mix 30% lithium hydroxide monohydrate and all the precursors uniformly, bake at 500° C. for 3 hours in an atmosphere with an oxygen volume concentration of 95%, and cool down by autothermal cooling to obtain a calcined product. After the calcined product is crushed and sieved, the remaining 70% lithium h...

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Abstract

The invention discloses a preparation method of a nickel cobalt lithium manganate ternary positive electrode material, which comprises the following steps: preparing an aluminum-containing nickel cobalt manganese precursor, adding a compound of an element W and a compound of an element Ir, and sintering to obtain the nickel cobalt manganese positive electrode material containing aluminum, tungsten and iridium. By doping Al in the precursor synthesis process and doping W and Ir in the sintering process, the three doping elements are uniformly distributed in the material, the synergistic effect of the three doping elements enables positive electrode material particles to have higher hardness, and the higher particle hardness not only improves the compaction density of a positive electrode piece, but also improves the conductivity of the positive electrode piece. And the formation of microcracks in the particles in the circulation process can be effectively inhibited, so that the circulation performance of the material is improved. In addition, the process is simple, the production process is easy to control, and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically relates to a preparation method of a nickel-cobalt-lithium manganese oxide ternary positive electrode material. Background technique [0002] Through the synergistic effect of nickel-cobalt-manganese or nickel-cobalt-aluminum, NCM or NCA has the advantages of high specific capacity, high rate and high safety performance, and has been widely used in 3C digital, electric vehicles and electric tools. [0003] With people's demand for high energy density, the high-nickel route has become one of the development trends of ternary cathode materials. However, with the increase of nickel content, the precursor is prone to cracking. The cathode prepared by sintering the precursor The hardness of the material particles is also relatively reduced. If the hardness of the positive electrode material is low, it is easy to produce fine powder and fall off on the pole piece during the pr...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 陈玉超邵洪源张洁
Owner WANHUA CHEM (SICHUAN) CO LTD
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