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High-nickel ternary cathode composite material and preparation method thereof

A composite material and positive electrode technology, which is applied in the field of high nickel ternary positive electrode composite material and its preparation, can solve the problems of affecting the electrochemical performance of the material, low lithium ion transmission rate, peeling off of the surface coating layer, etc. Increase, improve penetration efficiency, improve the effect of high temperature performance

Active Publication Date: 2020-08-28
SHANDONG FENGYUAN CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of lithium ions in the coating layer, the transmission rate of lithium ions is low under high rate conditions, which affects its rate performance, and the nano-metal oxides in the coating layer are easy to cause damage during subsequent processing such as slurry mixing. The surface coating layer falls off, which affects the electrochemical performance of its materials

Method used

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  • High-nickel ternary cathode composite material and preparation method thereof
  • High-nickel ternary cathode composite material and preparation method thereof
  • High-nickel ternary cathode composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) LiNi x co (1-x) / 2 mn (1-x) / 2 o 2 Preparation of matrix: 15.78 g (0.06 mol) NiSO 4 ·6H 2 O, 5.62 g (0.02 mol) C O SO4·7H 2 O, 3.96 g (0.02 mol) MnCl 2 4H 2 The O powder was then added to 70 g of twice distilled water, and ultrasonically dispersed to obtain a mixed solution A. At the same time, at a temperature of 80°C, 8 grams (0.2mol) of NaOH and 2000mL of double-distilled water were configured to form a 0.1mol / L NaOH solution and poured into a four-necked bottle and mixed with A for 8 hours. After that, weigh 24.24 grams (1.01mol) Lithium hydroxide and Ni in the above steps 0.6 co 0.2 mn 0.2 (OH) 2 9.2 grams (1.0mol) are mixed evenly, put the mixture into an alumina crucible, and calcined in a muffle furnace (heating rate 5°C / min), the calcining is divided into two stages, calcining at 500°C for 6 hours, and at 800°C Calcined at constant temperature for 16h, and finally got ternary LiNi 0.6 co 0.2 mn 0.2 o 2 matrix.

[0025] 2) Preparation of coati...

Embodiment 2

[0030] 1) LiNi x co (1-x) / 2 mn (1-x) / 2 o2 Preparation of matrix: 15.78 g (0.06 mol) NiSO 4 ·6H 2 O, 5.62 g (0.02 mol) C O SO4·7H 2 O, 3.96 g (0.02 mol) MnCl 2 4H 2 O powder was added to 70g of double-distilled water, and ultrasonically dispersed to obtain a mixed solution A; at the same time, at a temperature of 60°C, continuously stirred for 24 hours, aged for 6 hours, and then washed, filtered, and dried to obtain the precursor LiNi 0.6 co 0.2 mn 0.2 o 2 , 24.24 grams (1.01mol) of lithium hydroxide and Ni in the above steps 0.6 co 0.2 mn 0.2 (OH) 2 9.2 grams (1.0mol) are mixed evenly, put the mixture into an alumina crucible, and calcined in a muffle furnace (heating rate 5°C / min), the calcining is divided into two stages, calcining at 500°C for 6 hours, and at 800°C Calcined at constant temperature for 16h, and finally got ternary LiNi 0.6 co 0.2 mn 0.2 o 2 matrix.

[0031] 2) Preparation of coating solution: 20g of nickel foam (50% porosity), 20g of lith...

Embodiment 3

[0036] 1) LiNi x co (1-x) / 2 mn (1-x) / 2 o 2 Preparation of matrix: 15.78 g (0.06 mol) NiSO 4 ·6H 2 O, 5.62 g (0.02 mol) C O SO4·7H 2 O, 3.96 g (0.02 mol) MnCl 2 4H 2 The O powder was then added to 70 g of double-distilled water, and ultrasonically dispersed to obtain a mixed solution A; at the same time, at a temperature of 100 ° C, continuously stirred for 14 hours, aged for 6 hours, and then washed, filtered, and dried to obtain the precursor Ni0. 6 co 0.2 mn 0.2 (OH) 2 , 24.24 g (1.01 mol) of lithium hydroxide with 9.2 g (1.0 mol) of Ni in the above step 0.6 co 0.2 mn 0.2 (OH) 2 Mix evenly, put the mixture into an alumina crucible, and calcinate in a muffle furnace (heating rate 5°C / min). Get ternary LiNi 0.6 co 0.2 mn 0.2 o 2 matrix.

[0037] 2) Preparation of coating solution: 60g of foamed copper (60% porosity), 20g of lithium silicate, 2g of sodium methacryloxy zirconium aluminate, 3g of polyvinylpyrrolidone dispersant, 10g of diisopropylamine Base l...

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Abstract

The invention belongs to the preparation field of a lithium ion battery material, specifically a high-nickel ternary positive electrode composite material and a preparation method thereof. According to the high-nickel ternary positive electrode composite material, a LiNi<x>Co<(1-x) / 2>Mn<(1-x) / 2>O<2> (x is greater than or equal to 0.6 and less than or equal to 0.9) material is used as a substrate,and the surface of the substrate is coated with a nanometer porous metal oxide. The preparation method comprises the steps of dissolving foamy metal oxide, lithium silicate, a coupling agent and an organic alkali solution thereof into an organic solvent to be prepared into a coating liquid; coating the surface of the LiNi<x>Co<(1-x) / 2>Mn<(1-x) / 2>O<2> material with the coating liquid, then pumpingsulfur dioxide to adjust the Ph value of paste to 7-9, and performing filtering and carbonizing; and finally, carrying out an ion injection method to inject a metal dopant to be subjected to doping toobtain the coated and modified high-nickel ternary positive electrode material. By virtue of the high-nickel ternary positive electrode composite material, alkalinity of the high-nickel material is lowered, and high processability is achieved; and meanwhile, by doping metal elements, the specific capacity is increased, and through the functional additive of the coating layer, the cycle performance and safety performance are improved.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery materials, in particular to a high-nickel ternary cathode composite material and a preparation method thereof. Background technique [0002] As the market's requirements for electric mileage increase, lithium-ion batteries are required to have higher energy density, and the cathode material is a key factor affecting the energy density of lithium-ion batteries. At present, the high-energy-density materials on the market are mainly ternary materials, and high-nickel ternary materials (Ni≧0.6) will become the mainstream in the future market. The surface coating of the material can isolate the material from direct contact with the electrolyte. On the one hand, the water absorption performance of the material can be reduced to improve its safety and cycle performance. On the other hand, the electrical conductivity of the material and its gram capacity can be improved by coating. The e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 李桂臣朱涛
Owner SHANDONG FENGYUAN CHEM CO LTD