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A kind of lithium ion battery gradient cathode material precursor and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low bulk density, difficulty in achieving uniform distribution of transition metal elements, and hindering the practical application of materials, and achieve narrow particle size distribution , high density and good sphericity

Active Publication Date: 2016-04-06
HUBEI RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Synthesis of LiNi by High Temperature Solid Phase Method x co y mn z o 2 It is difficult to achieve a uniform distribution of transition metal elements in the cathode material, and the low packing density of the synthesized material particles hinders the practical application of the material
However, the cathode material precursor synthesized by co-precipitation method has good sphericity and improved tap density, which greatly increases the machinability of the material, but LiNi with uniform internal structure x co y mn z o 2 The material still has shortcomings in terms of capacity and cycle performance

Method used

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  • A kind of lithium ion battery gradient cathode material precursor and preparation method thereof
  • A kind of lithium ion battery gradient cathode material precursor and preparation method thereof

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Embodiment 1

[0036] NiSO 4 , CoSO 4 , MnSO 4 The molar ratios are respectively Ni:Co:Mn=0.5:0.2:0.3 and 1 / 3:1 / 3:1 / 3 to prepare solutions A and B. The volumes of solutions A and B are the same and the total concentration is 1.5mol / L, prepare 5.0mol / L sodium hydroxide solution, prepare ammonia solution with a concentration of 10.0mol / L, add solution A to solution B at a speed of 50L / h with a metering pump, and stir evenly at the same time at a speed of 100L / h Flow into the reactor, at the same time, sodium hydroxide solution and ammonia solution are also added to the reactor for reaction. Under the condition of nitrogen protection, the temperature of the reaction vessel was controlled at 50° C., the pH value was 11.0, the stirring speed was 500 r / min, and the flow rate of ammonia water was 15 L / h. There is no need to overflow during the reaction process, and the reaction can be stopped after the consumption of solutions A and B at the same time. Solid-liquid separation was carried out a...

Embodiment 2

[0038] NiCl 2 , CoCl 2 , MnCl 2 Prepare solutions A and B at the ratio of Ni:Co:Mn=0.4:0.3:0.3 and 0.8:0.1:0.1 respectively by molar ratio. The volume of solutions A and B is the same and the total concentration is 2.0mol / L. Prepare 5.0mol / L Sodium hydroxide solution, prepare ammonia solution with a concentration of 8.0mol / L, use a metering pump to add solution A to solution B at a speed of 100L / h, stir evenly and then flow into the reaction kettle at a speed of 200L / h, and At the same time, sodium hydroxide solution and ammonia solution are also added to the reactor for reaction. Under the protection condition of argon, the temperature of the reaction vessel was controlled at 45° C., the pH value was 11.5, the stirring speed was 300 r / min, and the flow rate of ammonia water was 25 L / h. There is no need to overflow during the reaction process, and the reaction can be stopped after the consumption of solutions A and B at the same time. Solid-liquid separation was carried ou...

Embodiment 3

[0040] NiSO 4 , CoSO 4 , MnSO 4 Solution A is prepared in a molar ratio of Ni:Co:Mn=0.5:0.2:0.3, Ni(NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 Prepare solution B in the ratio of Ni:Co:Mn=0.2:0.2:0.6 in molar ratio, the volume of solution A and B is the same and the total concentration is 1.5mol / L and 2.0mol / L respectively, prepare 4.0mol / L of hydroxide Potassium solution, prepare a citric acid solution with a concentration of 15.0mol / L, add solution A to solution B at a speed of 80L / h with a metering pump, and flow into the reaction kettle at a speed of 160L / h after stirring evenly. , Sodium hydroxide solution and ammonia solution are also added to the reaction kettle for reaction. Under nitrogen protection conditions, the temperature of the reaction vessel was controlled at 60° C., the pH value was 12.0, the stirring speed was 800 r / min, and the flow rate of the citric acid solution was 20 L / h. There is no need to overflow during the reaction process, and the reaction can ...

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Abstract

The invention relates to a preparation method for a lithium-ion-battery gradient cathode-material precursor, and belongs to the technical field of preparation of lithium ion batteries cathode materials. The concrete steps of the method comprise; preparing a solution A and a solution B with different molar ratios from a nickel salt, a cobalt salt and a manganese salt, and controlling the volume of the solution A and the solution B to be same; employing a metering pump to gradually adding the solution A into the solution B, then adding the uniformly-mixed solution into a reaction kettle, and also adding an alkali solution and a complexing agent solution into the reaction kettle, and stabilizing synthesis technology parameters during reaction, stopping reaction once the solution A and the solution B are completely consumed, finally centrifuging, washing and drying, so as to prepare the spherical cathode material precursor with different-concentration gradient-distributed elements. The disclosed preparation method helps to improve the processing performance and the tap density of the cathode material, and overcome the disadvantages about capacity and stability of the material, and by controlling the morphology and the particle size of the cathode material, the physicochemical performances of the cathode material are controlled and the material stability is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a preparation method of a gradient cathode material precursor of a lithium ion battery. Background technique [0002] Lithium-ion batteries are the latest generation of recyclable secondary batteries that have become popular and developed rapidly after nickel-cadmium batteries and nickel-hydrogen batteries. In today's energy shortage and environmental deterioration, lithium-ion batteries have high working voltage, small size, light weight, no memory effect, high specific energy, low environmental pollution, low self-discharge rate, some systems can be charged and discharged quickly, and the operating temperature The advantages of wide range, long cycle life, and good safety performance make it the future development direction of electric vehicles (EV) and hybrid electric vehicles (HEV). Not only in the automotive industry, but also in elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 姚元路陈明峰毛秦钟王顺林
Owner HUBEI RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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