Lithium iron phosphate-boric acid co-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof

A technology of lithium nickel cobalt aluminate and positive electrode materials, which is applied in the direction of positive electrodes, chemical instruments and methods, nickel compounds, etc., can solve problems such as cycle performance and safety performance of lithium nickel cobalt aluminate, and achieve improved cycle performance and safety Performance, improvement of electrical conductivity, and improvement of processability

Inactive Publication Date: 2020-09-11
SHAANXI COAL & CHEM TECH INST
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  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium iron phosphate-boric acid co-coated nickel-cobalt lithium aluminate positive electrode material and a preparation method thereof, so as to overcome problems such as cycle performance and safety

Method used

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  • Lithium iron phosphate-boric acid co-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof
  • Lithium iron phosphate-boric acid co-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof
  • Lithium iron phosphate-boric acid co-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof

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preparation example Construction

[0026] A preparation method of lithium iron phosphate-boric acid co-coated nickel cobalt lithium aluminate positive electrode material, comprising the following steps:

[0027] Step 1: Weigh the nickel-cobalt-lithium-aluminate precursor, mix it with lithium and sinter it to obtain the primary sintered material of nickel-cobalt-lithium aluminate; the lithium source used when mixing lithium is lithium hydroxide, and the nickel-cobalt-lithium aluminate precursor and The molar ratio of the lithium source is 1:(1.01-1.06), the sintering temperature is 650-750°C, and the holding time is 9-15hh;

[0028] Step 2: Add the primary sintered material of nickel cobalt lithium aluminate into deionized water for stirring and washing, the mass ratio of deionized water to the primary sintering material of nickel cobalt lithium aluminate is (1-5):1, and the stirring and washing time is 10- 60min, the stirring line speed is 500rpm, vacuum drying after solid-liquid separation to obtain matrix pos...

Embodiment 1

[0031] Step 1: Weigh a certain mass of nickel cobalt lithium aluminate precursor, the molecular formula is Ni 0.91 co 0.06 Al 0.03 (OH) 2 , mixed lithium hydroxide (LiOH·H 2 After O) sintering is carried out to obtain the primary sintered material of nickel cobalt lithium aluminate. The molar ratio of nickel-cobalt-lithium-aluminate precursor to lithium source is 1:1.01, the sintering temperature is 650°C, and the holding time is 9h.

[0032] Step 2: Weigh a certain mass of nickel-cobalt lithium aluminate primary sintering material, add a certain mass of deionized water according to the water-to-material ratio of 1:1, and perform stirring and washing. The stirring speed is 500 rpm, and the washing time is 10 minutes. Afterwards, it was suction filtered and vacuum dried for 4 hours at a temperature of 100° C. to obtain a nickel-cobalt-lithium-aluminate cathode material matrix.

[0033] Step 3: Ball milling and mixing the base positive electrode material and the coating lit...

Embodiment 2

[0036] Step 1: Weigh a certain mass of nickel cobalt lithium aluminate precursor, the molecular formula is Ni 0.91 co 0.06 Al 0.03 (OH) 2, mixed lithium hydroxide (LiOH·H 2 After O) sintering is carried out to obtain the primary sintered material of nickel cobalt lithium aluminate. The molar ratio of nickel-cobalt-lithium-aluminate precursor to lithium source is 1:1.02, the sintering temperature is 710°C, and the holding time is 12h.

[0037] Step 2: Weigh a certain mass of nickel-cobalt lithium aluminate primary sintering material, add a certain mass of deionized water according to the water-to-material ratio of 2:1 to carry out stirring and washing, the stirring speed is 500rpm, and the washing time is 30min. Afterwards, centrifuge and vacuum dry for 6 hours at a temperature of 120° C. to obtain a nickel-cobalt-lithium-aluminate cathode material matrix.

[0038] Step 3: Mix the matrix positive electrode material and the coating lithium iron phosphate-boric acid through ...

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Abstract

The invention discloses a lithium iron phosphate-boric acid co-coated lithium nickel cobalt aluminate positive electrode material and a preparation method thereof. The preparation method comprises thefollowing steps: weighing a certain mass of a lithium nickel cobalt aluminate precursor, mixing lithium, sintering to obtain a lithium nickel cobalt aluminate primary sintered material, carrying outstirring and water washing on the lithium nickel cobalt aluminate primary sintered material, and carrying out vacuum drying to obtain a lithium nickel cobalt aluminate positive electrode material matrix; and mixing the matrix positive electrode material with a coating material lithium iron phosphate-boric acid, and carrying out high-temperature sintering to obtain the lithium iron phosphate-boricacid co-coated lithium nickel cobalt aluminate positive electrode material. The co-coated lithium nickel cobalt aluminate positive electrode material provided by the invention has good conductivity and a uniform coating layer, can prevent direct reaction between a positive electrode material matrix and an electrolytic solution, and effectively improves the cycle performance and safety performanceof the material. The method is simple in process, excellent in product performance, low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery positive electrode materials, and in particular relates to a lithium iron phosphate-boric acid co-coated nickel cobalt lithium aluminate positive electrode material and a preparation method thereof. Background technique [0002] With the increasing rise of the new energy automobile industry, the lithium-ion battery industry has developed rapidly. The cathode material plays a key role as an important component. Among the cathode materials, lithium nickel cobalt aluminate has been widely studied and applied because of its high energy density, good thermal stability, and good cycle performance. However, the nickel-cobalt-lithium-aluminate cathode material also has certain defects. Due to its high nickel content, the material is prone to lithium-nickel mixing, resulting in structural instability of the material; in addition, high-valent nickel will react with the electrolyte, resulting in...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/485H01M4/62H01M10/0525C01G53/00C01B25/45C01B35/10
CPCC01B25/45C01B35/1045C01G53/006H01M4/366H01M4/485H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 徐可寇亮张诚张超刘增田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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