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Method for preparing lithium nickel cobalt aluminate positive electrode material

A technology of nickel cobalt lithium aluminate and cathode material, which is applied in nanotechnology, chemical instruments and methods, and nickel compounds for materials and surface science, and can solve the problem of increased raw material cost, high control accuracy requirements, and difficult synthesis techniques. big problem

Active Publication Date: 2020-10-16
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This process can directly prepare nickel-cobalt-aluminum hydroxide precursor, but due to Al 3+ Precipitation equilibrium constant and Ni 2+ 、Co 2+ The equilibrium constant is much smaller than that of Al(OH) 3 segregation, forming flocculent precipitates, resulting in poor sphericity of the prepared precursor, loose structure, low tap density; and Al(OH) 3 It is an amphoteric hydroxide, and the control precision of the pH value is very high during the reaction process, and the synthesis technology is difficult; some people use sodium metaaluminate as the aluminum source, which will lead to a relatively large increase in the cost of raw materials

Method used

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  • Method for preparing lithium nickel cobalt aluminate positive electrode material
  • Method for preparing lithium nickel cobalt aluminate positive electrode material
  • Method for preparing lithium nickel cobalt aluminate positive electrode material

Examples

Experimental program
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Embodiment 1

[0054] (1) Preparation of spherical nickel hydroxide: prepare a nickel sulfate solution with a nickel ion concentration of 2mol / L, an ammonia solution with an ammonia concentration of 85g / L, and an alkali solution with a sodium hydroxide concentration of 6mol / L; Dilute the 85g / L ammonia solution to 7g / L and fill the 10L overflow reactor as the bottom liquid of the reaction. Maintain the stirring speed of the overflow reactor at 600rpm and the temperature of the reactor at 55℃; use a constant flow rate of 500mL / h to A nickel sulfate solution with a concentration of 2mol / L is added to the overflow reactor, and an ammonia solution with an ammonia concentration of 85g / L is added to the overflow reactor to maintain the ammonia concentration in the reaction solution at 7g / L, while adding a concentration of 6mol / L of sodium hydroxide solution and adjust the pH value of the reaction solution by controlling the flow rate. At the beginning of the reaction, maintain the pH value of the re...

Embodiment 2

[0063] (1) Preparation of spherical nickel hydroxide: prepare a nickel nitrate solution with a nickel ion concentration of 1.5 mol / L, prepare an ammonia solution with an ammonia concentration of 50 g / L, and prepare an alkali solution with a sodium hydroxide concentration of 5 mol / L; Ammonia solution with a concentration of 50g / L is diluted to 6g / L and filled with a 10L overflow reactor as the bottom liquid of the reaction. The stirring speed of the overflow reactor is maintained at 500rpm and the temperature of the reactor is 50℃; at a constant flow rate of 450mL / h Add a nickel nitrate solution with a concentration of 1.5mol / L to the overflow reactor, and at the same time add an ammonia solution with an ammonia concentration of 50g / L to the overflow reactor to maintain the ammonia concentration in the reaction solution at 6g / L, while adding the concentration It is a 5mol / L sodium hydroxide solution and the pH value of the reaction solution is adjusted by controlling the flow rat...

Embodiment 3

[0068] (1) Preparation of spherical nickel hydroxide: prepare a nickel acetate solution with a nickel ion concentration of 2.5 mol / L, an ammonia solution with an ammonia concentration of 70 g / L, and an alkali solution with a sodium hydroxide concentration of 7 mol / L; Ammonia solution with a concentration of 70g / L is diluted to 8g / L and filled with a 10L overflow reactor as the bottom liquid of the reaction. The stirring speed of the overflow reactor is maintained at 400rpm and the temperature of the reactor is 60℃; at a constant flow rate of 400mL / h Add a nickel acetate solution with a concentration of 2.5mol / L to the overflow reactor, and at the same time add an ammonia solution with an ammonia concentration of 70g / L to the overflow reactor to maintain the ammonia concentration in the reaction solution at 8g / L, while adding the concentration It is a 7mol / L sodium hydroxide solution and the pH value of the reaction solution is adjusted by controlling the flow rate. At the beginn...

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Abstract

The invention discloses a method for preparing a lithium nickel cobalt aluminate positive electrode material, and belongs to the technical field of preparation of lithium ion battery positive electrode materials. The preparation method comprises the following steps of: firstly, respectively preparing spherical nickel hydroxide and cobalt-aluminum hydrotalcite nanosheets, then coating the surface of the spherical nickel hydroxide with the cobalt-aluminum hydrotalcite nanosheets through solid-phase ball milling, cobalt-aluminum hydrotalcite nanosheet coated spherical nickel hydroxide is used asa precursor to be mixed and roasted with a lithium compound to obtain the lithium nickel cobalt aluminate LiNi1-x-yCoxAlyO2 positive electrode material, wherein 1-x-y is greater than or equal to 0.8 and smaller than 1, x is greater than 0 and smaller than or equal to 0.15, and y is greater than 0 and smaller than or equal to 0.06. The method has the advantages that nickel, cobalt and aluminum elements are uniformly distributed in the product, the Li<+> / Ni<2+> mixed arrangement degree can be reduced by utilizing the LiCo1-xAlxO2 intermediate phase buffer layer effect, and a more regular layeredstructure is obtained. The prepared lithium nickel cobalt aluminate positive electrode material has high tap density, high specific capacity, good rate capability, high cycling stability and other excellent electrochemical properties; and moreover, the process is simple, the controllability is high, and large-scale production is facilitated.

Description

Technical field [0001] The invention belongs to the technical field of preparation of lithium ion battery cathode materials, and particularly relates to a method for preparing nickel cobalt lithium aluminate cathode materials, that is, preparing nickel cobalt lithium aluminate using cobalt aluminum hydrotalcite nanosheets coated with spherical nickel hydroxide as a precursor Method of cathode material. Background technique [0002] Lithium-ion battery as a kind of green battery has attracted attention since its inception. Lithium-ion battery has been widely used in portable electronic products and is also considered to be the best choice for power batteries for electric vehicles. As the core component of the battery, the performance of lithium-ion battery cathode materials directly affects the performance indicators of lithium-ion batteries. Therefore, cathode materials with high specific capacity, good safety, and long cycle life have attracted much attention. High nickel catho...

Claims

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Application Information

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IPC IPC(8): C01G53/00B82Y30/00B82Y40/00H01M4/485H01M4/525H01M4/62H01M10/0525
CPCC01G53/006H01M4/485H01M4/525H01M4/628H01M10/0525B82Y30/00B82Y40/00C01P2004/03C01P2004/64C01P2004/32Y02E60/10
Inventor 杨文胜肖鹏李汶壕
Owner BEIJING UNIV OF CHEM TECH
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