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Wrapping method of nickel-cobalt-aluminum ternary positive electrode material and application

A positive electrode material, nickel-cobalt-aluminum technology, applied in the field of lithium-ion battery positive electrode material preparation, can solve serious problems such as poor surface adhesion of modified materials, particle agglomeration, etc.

Active Publication Date: 2018-11-13
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The surface coating methods of positive electrode materials disclosed in the above-mentioned comparative document 1 and comparative document 2 all use the traditional drying process to evaporate the solvent, but the particle agglomeration of the material obtained by the traditional drying and drying method is relatively serious, mainly It is because the removal of water will increase the gravitational force between the particles, making the nano-scale primary particles agglomerate into massive secondary particles, which will cause the modified material to have poor adhesion on the surface of the matrix material and form both. mixture

Method used

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  • Wrapping method of nickel-cobalt-aluminum ternary positive electrode material and application
  • Wrapping method of nickel-cobalt-aluminum ternary positive electrode material and application
  • Wrapping method of nickel-cobalt-aluminum ternary positive electrode material and application

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Experimental program
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Effect test

Embodiment 1

[0074] Embodiment 1: (freeze-dried coating material)

[0075] Step 1: Preparation of Precursor

[0076] NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and Al 2 (SO 4 ) 3 18H 2 O is the raw material, and it is calculated according to the ratio n of each element substance in the target product Ni :n Co :n Al =80:15:5 Accurately weigh and prepare 2mol L -1 Sulfate mixed solution, in the form of 4mol·L -1 NaOH is the precipitating agent, 1mol L -1 NH 3 ·H 2 O is a complexing agent. Before the reaction starts, use 100mL deionized water as the bottom solution and perform magnetic stirring, drop the salt solution into the beaker at a certain speed, and the flow rate of the lye (mixed solution of sodium hydroxide and ammonia water) changes with the change of pH Control, salt solution and lye form a precipitate in the beaker, the precipitate is washed and dried to obtain the precursor Ni 0.8 co 0.15 Al 0.05 (OH) 2 .

[0077] Step 2: Nickel-cobalt-aluminum ternary cathode material ...

Embodiment 2

[0082] Embodiment 2: (freeze-dried coating material, 1wt%TiO 2 coating amount)

[0083] Step 1: Preparation of Precursor

[0084] NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and Al 2 (SO 4 ) 3 18H 2 O is the raw material, and it is calculated according to the ratio n of each element substance in the target product Ni :n Co :n Al =85:10:5 Accurately weigh and prepare 3mol L -1 Sulfate mixed solution, in the form of 6mol·L -1 NaOH is the precipitating agent, 3mol L -1 NH 3 ·H 2 O is a complexing agent. Before the reaction starts, use 100mL ethanol as the base liquid and carry out magnetic stirring, drop the salt solution into the beaker at a certain speed, and the flow rate of the lye (the mixed solution of sodium hydroxide and ammonia water) is regulated with the change of pH, The salt solution and lye form a precipitate in the beaker, and the precipitate is washed and dried to obtain the precursor Ni 0.8 co 0.15 Al 0.05 (OH) 2 .

[0085] Step 2: Nickel-cobalt-aluminum...

Embodiment 3

[0090] Embodiment 3: (freeze-dried coating material, 5wt%TiO 2 coating amount)

[0091] Step 1: Preparation of Precursor

[0092] With Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·7H 2 O, Al(NO 3 ) 3 18H 2 O is the raw material, and it is calculated according to the ratio n of each element substance in the target product Ni :n Co :n Al =75:20:5 Accurately weigh and prepare 1mol L -1 Nitrate mixed solution, in the form of 2mol·L -1 NaOH is the precipitating agent, 1mol L -1 NH 3 ·H 2 O is a complexing agent. Before the reaction starts, use 100mL deionized water as the bottom solution and perform magnetic stirring, drop the salt solution into the beaker at a certain speed, and the flow rate of the lye (mixed solution of sodium hydroxide and ammonia water) changes with the change of pH Control, salt solution and lye form a precipitate in the beaker, the precipitate is washed and dried to obtain the precursor Ni 0.8 co 0.15 Al 0.05 (OH) 2 .

[0093] Step 2: Nickel-coba...

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Abstract

The invention provides a wrapping method of a nickel-cobalt-aluminum ternary positive electrode material and an application. The wrapping method is a surface wrapping method on a base material of thenickel-cobalt-aluminum ternary positive electrode material LiNi0.8Co0.15Al0.05O2 by a solvothermal method and a freeze-drying method. The invention further provides an application of the wrapping method to a lithium ion battery, and particularly relates to a preparation method of the lithium ion battery. According to the method, the nickel-cobalt-aluminum ternary positive electrode material LiNi0.80Co1.5Al0.05O2 wrapped with TiO2 is prepared by the freeze-drying method and can effectively improve interface effect of the material, so that the internal resistance of the battery is reduced, the cyclic stability of the material can be greatly improved when a charging cut-off potential is high, the heat stability of the material is improved, charge and discharge performances of the material under high current are improved, overlaying reunion of a wrapping modified material can be effectively avoided by the freeze-drying method, and the modified material uniformly wraps the surface of a material to be modified.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a coating method and application of a nickel-cobalt-aluminum ternary positive electrode material, in particular to LiNi, a nickel-cobalt-aluminum ternary positive electrode material 0.8 0Co 1.5 Al 0.05 o 2 Coating method and application. Background technique [0002] Li-ion battery ternary cathode material LiNi 0.8 co 0.15 Al 0.05 o 2 It has the advantages of high capacity of high nickel-based cathode materials, but also has the following defects: [0003] (a) During the charge and discharge process, the positive electrode material is in contact with the electrolyte to produce the cubic salt rock phase active material NiO, and the electron and ion conductivity of NiO are lower than that of the positive electrode material; [0004] (b) Inactive Ni is produced during cycling and is distributed throughout the mate...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/525
CPCH01M4/485H01M4/525Y02E60/10
Inventor 武媛徐海平刘昆刘学良伍成王耐清李小兵
Owner 桑顿新能源科技(长沙)有限公司
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