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Nickel-cobalt-aluminum ternary precursor as well as preparation method thereof and preparing anode material and method

A positive electrode material, nickel-cobalt-aluminum technology, applied in the field of preparation of lithium-ion battery positive electrode materials and their precursor materials, can solve problems affecting the reaction speed of co-precipitation, achieve the effect of avoiding local enrichment and improving tap density

Active Publication Date: 2017-01-04
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the acidic soluble salt of Al as the aluminum source, stable complex ions can be formed in advance with complexing agents such as EDTA, but Ni and Co elements cannot form stable complex ions in advance, which affects the speed of coprecipitation reaction

Method used

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  • Nickel-cobalt-aluminum ternary precursor as well as preparation method thereof and preparing anode material and method
  • Nickel-cobalt-aluminum ternary precursor as well as preparation method thereof and preparing anode material and method
  • Nickel-cobalt-aluminum ternary precursor as well as preparation method thereof and preparing anode material and method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Take ammonia water with a concentration of 10mol / L, add nickel sulfate and cobalt sulfate according to the ratio of 368.9g of nickel sulfate and 74.0g of cobalt sulfate per liter of ammonia water, stir to dissolve nickel sulfate and cobalt sulfate, and prepare ammonia complex ions of Ni and Co Solution (Solution I), by 81.9g NaAlO per liter 2 The ratio preparation sodium metachlorate solution (solution II), preparation 6mol / L sodium hydroxide solution (solution IV), prepares the mixed salt solution of nickel sulfate and cobalt sulfate according to the ratio of Ni / Co=0.842 / 0.158, the total salt solution The concentration is 2.5mol / L (Solution III). Four kinds of solutions are added in the reaction kettle concurrently, wherein the flow velocity of nickel-cobalt salt solution (solution III) is 100ml / min, obtains nickel, cobalt complex ion solution flow velocity by formula (1) and is 30ml / min, by formula (2 ) to obtain the sodium metaaluminate solution flow rate is 15.8ml / ...

Embodiment 2

[0055] Take ammonia water with a concentration of 10mol / L, add nickel sulfate 406.5g and cobalt sulfate 33.80g per liter of ammonia water, add nickel sulfate and cobalt sulfate, stir to dissolve nickel sulfate and cobalt sulfate, and prepare ammonia complex ions of Ni and Co Solution (Solution I), 163.9 g NaAlO per liter 2 The ratio preparation sodium metachlorate solution (solution II), preparation 6mol / L sodium hydroxide solution (solution IV), prepares the mixed salt solution of nickel sulfate and cobalt sulfate according to the ratio of Ni / Co=0.928 / 0.072, the total salt solution The concentration is 2.3mol / L (Solution III). Four kinds of solutions are added in the reaction kettle concurrently, wherein the flow velocity of nickel-cobalt salt solution (solution III) is 200ml / min, obtain nickel, cobalt complex ion solution flow velocity V by formula (1) 1 Be 48ml / min, obtain sodium metaaluminate solution flow velocity V by formula (2) 2 Be 25.3ml / min, adjust the flow rate o...

Embodiment 3

[0058] Preparation of Ni 0.98 co 0.01 Al 0.01 (OH) 2 Precursor: get concentration and be the ammoniacal liquor of 15mol / L, add nickelous sulfate and cobaltous sulfate according to the ratio of adding nickel sulfate 390.3g and cobaltous sulfate 4.3g per liter of ammoniacal liquor, stir nickel sulfate and cobaltous sulfate dissolve, prepare Ni, Co Ammonia complex ion solution (solution I), according to 245.9g NaAlO per liter 2The ratio preparation sodium metachlorate solution (solution II), preparation 10mol / L sodium hydroxide solution (solution IV), prepares the mixed salt solution of nickel sulfate and cobalt sulfate according to the ratio of Ni / Co=0.928 / 0.072, the total salt solution The concentration is 2.3mol / L (Solution III). Four kinds of solutions are added in the reaction kettle concurrently, wherein the flow rate of nickel-cobalt salt solution (solution III) is 150ml / min, obtain nickel, cobalt complex ion solution flow rate V by formula (1) 1 Be 48ml / min, obtain s...

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Abstract

The invention discloses a nickel-cobalt-aluminum ternary precursor as well as a preparation method thereof and a preparing anode material and a method. The preparation method comprises the following steps: dissolving soluble salts of Ni and Co into ammonia water so as to prepare a Ni and Co ammonia complex ion solution as a complexing agent solution, adding a complexing agent into an aluminum salt solution so as to prepare an Al complex ion solution as an aluminum source solution, combining and adding the Ni and Co soluble salt solution, a precipitant solution, the complexing agent solution and the aluminum source solution into a reaction kettle, controlling a reaction pH value and reaction temperature, controlling the reaction time to be at least greater than 10h, performing solid-liquid separation on slurry obtained through reaction, and washing and drying the obtained solid, thereby obtaining the nickel-cobalt-aluminum ternary precursor. A nickel-cobalt-aluminum ternary anode material can be prepared from a mixture of the precursor and a lithium salt through high-temperature thermal treatment in the presence of air or oxygen. The mixing uniformity of three elements of Ni, Co and Al can be effectively improved, and the tap density of the precursor material can be improved, and the spherical degree of granules can be increased.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery positive electrode materials and precursor materials thereof, in particular to a nickel-cobalt-aluminum ternary precursor, a preparation method thereof, and a prepared positive electrode material and method. Background technique [0002] Due to the advantages of high capacity and high energy density, nickel-cobalt-aluminum-lithium ternary material (NCA material) has become an ideal cathode material for high energy density lithium ion cathode materials. Tesla electric vehicles in the United States use more than 8,000 18650 batteries with NCA materials as the positive electrode to form a battery pack. The nominal capacity of the 18650 battery whose material is the positive electrode can reach more than 3.0Ah, which is unmatched by other positive electrode materials that have been put into practical use at present. [0003] The physical, chemical and electrochemical proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 陈勃涛唐淼李征玉徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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