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Preparation method of aluminum oxide coated modified lithium nickel cobalt manganese oxide positive electrode material

A lithium-nickel-cobalt-manganese-oxygen positive electrode and alumina technology, which is applied in battery electrodes, manganate/permanganate, electrical components, etc., can solve the problem of inability to ensure uniform precipitation of aluminum hydroxide and increase the use of isopropanol , Not suitable for large-scale production and other issues, to achieve the effect of improving cycle performance and safety performance, inhibiting agglomeration, and improving surface stability

Active Publication Date: 2017-12-26
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] CN201110222410.7 and 201110222398.X respectively disclose a method for preparing an aluminum-coated lithium-ion battery positive electrode material, but the co-precipitation method provided in CN201110222410.7 has a concentration of hydroxide and aluminum ions near the feed point High, a large amount of aluminum hydroxide will be generated in an instant near the feed point, and the uniform precipitation of aluminum hydroxide on the surface of the substrate cannot be guaranteed
CN201110222398.X is coated with organic aluminum source, which is highly toxic. Aluminum isopropoxide is difficult to configure into a relatively high-concentration uniform solution in isopropanol, which increases the usage of isopropanol and significantly increases the cost. suitable for mass production

Method used

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  • Preparation method of aluminum oxide coated modified lithium nickel cobalt manganese oxide positive electrode material
  • Preparation method of aluminum oxide coated modified lithium nickel cobalt manganese oxide positive electrode material
  • Preparation method of aluminum oxide coated modified lithium nickel cobalt manganese oxide positive electrode material

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Embodiment 1

[0038] 1) According to the molecular formula Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The proportion of transition metals to prepare NiSO 4 、CoSO 4 , MnSO 4 mixed aqueous solution, the cation concentration is 2mo1 / L;

[0039] 2) Add the mixed solution in step 1), 2mol / L NaOH solution and 3mol / L ammonia solution dropwise into the reaction vessel, control the pH of the system at 11.0, and heat to 50°C in a water bath. After reacting for 12 hours, filter, wash, and vacuum dry at 120°C for 8 hours to obtain the precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3) (OH) 2 ;

[0040] 3) The precursor (Ni 1 / 3 co 1 / 3 mn 1 / 3) (OH) 2 , aluminum nitrate nonahydrate and dispersant urea in molar ratio precursor: Al: urea = 100: 0.5: 8.35 ratios were weighed 50g precursor, 3.67g aluminum nitrate nonahydrate and 5.35g dispersant urea were dissolved in 250mL deionized In water, stir to disperse evenly;

[0041] 4) Warm up the dispersion solution obtained in step 3) to 70°C, keep stirring for 1 hour, and filte...

Embodiment 2-5

[0046] The steps of embodiment 2-5 are basically the same as the steps of embodiment 1, the difference is that in step 3) of embodiment 2-5, the precursor quality, aluminum salt, aluminum salt concentration, precursor: aluminum element: all The powder molar ratio and alumina coating ratio are shown in the following table:

[0047]

[0048]

[0049] figure 1 and figure 2 They are the morphology of the precursor alumina in Example 2 before and after coating. It can be seen from the figure that the uniformity of the coated alumina in the embodiment of the present invention is very good; image 3 Shown is the ICP result graph of the precursor coated alumina prepared in Example 2 of the present invention. It can be seen from the figure that the aluminum content coated in the embodiment of the present invention is consistent with the designed amount, indicating that the coating method The practicability is better.

[0050] Electrochemical Performance Analysis

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Abstract

The invention discloses a method for preparing an aluminum oxide coated modified lithium nickel cobalt manganese oxygen cathode material. The method comprises the following steps of: (1) preparation of a precursor: mixing water-soluble metallic nickel salt, cobalt salt and manganese salt into a mixed solution, dripping the mixed solution, a precipitator and a morphological control agent into a reaction container, controlling the pH value and reaction temperature of a system, and performing filtering, washing and vacuum drying after reaction to obtain a (NixCoyMn1-x-y)(OH)2 precursor, wherein x, y and x+y are more than 0 and less than 1; (2) preparation of an aluminum oxide coated precursor: dispersing the (NixCoyMn1-x-y)(OH)2 precursor, water-soluble aluminum salt and a disperser into deionized water, stirring while heating until the disperser is hydrolyzed, filtering to obtain an Al(OH)3-coated (NixCoyMn1-x-y)(OH)2 precursor, roasting the precursor in a sintering furnace to obtain Al2O3-coated (NixCoyMn1-x-y)(OH)2 precursor powder; and (3) uniformly mixing the Al2O3-coated (NixCoyMn1-x-y)(OH)2 precursor powder with lithium salt powder, and calcinating at high temperature to obtain an aluminum oxide coated modified Li(NixCoyMn1-x-y)O2 cathode material with a lamellar crystal structure.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to a method for preparing an aluminum oxide-coated modified lithium-nickel-cobalt-manganese-oxygen lithium-ion battery cathode material. Background technique [0002] After a long period of rapid development, lithium-ion batteries have made a series of great advances and are considered to be one of the most potential energy sources for electric vehicles. However, due to a series of shortcomings such as short life, poor adaptability to abuse, and high cost of current lithium-ion batteries, electric vehicles powered by lithium-ion batteries have not yet achieved widespread commercial success. [0003] Ganines and Cuenca (L.Gaines and R.Cuenca, Cost of Lithium Ion Batteries for Vehicles, U.S.Department of Energy, 2000.) pointed out by calculation: in lithium-ion batteries, the cost of the positive electrode material only accounts for 15-20%, and manga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525C01G45/12
CPCY02E60/10
Inventor 吴振豪郎野何金华夏恒涛
Owner NINGDE AMPEREX TECH
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