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Preparation method of lithium-ion battery positive electrode material doped with aluminum by solid phase method

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low bulk density of powder materials, poor high-temperature safety performance and high-temperature cycle performance, and difficulty in mixing materials uniformly. To achieve the effect of simple and easy operation of the process, good controllability of product quality, and reduced manufacturing costs

Active Publication Date: 2015-10-28
山东天骄新能源有限公司
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Problems solved by technology

The disadvantages of this method are: first, the solid phase diffusion speed is slow, the mixing is difficult to be uniform, and there are large differences in the structure and composition of the product, which makes its electrochemical performance difficult to control; second, the bulk density of the synthesized powder material Low, generally achieved tap density is only 1.6 ~ 1.8g / cm 3 , so that the volume specific capacity of lithium nickel cobalt manganese oxide is much lower than that of lithium cobalt oxide, which affects its practical application
[0004] However, the current pure nickel-cobalt lithium manganese oxide ternary material is only suitable for general batteries, and the high-temperature safety performance and high-temperature cycle performance are not very good.

Method used

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  • Preparation method of lithium-ion battery positive electrode material doped with aluminum by solid phase method
  • Preparation method of lithium-ion battery positive electrode material doped with aluminum by solid phase method
  • Preparation method of lithium-ion battery positive electrode material doped with aluminum by solid phase method

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Embodiment 1

[0024] NiSO 4 、CoSO 4 , MnSO 4 Moore than Ni 2+ :CO 2+ :Mn 2+ = Mix in the ratio of 4:2:4, dissolve with deionized water, and make a solution with a comprehensive ion concentration of 2mol / L. Prepare 4mol / L sodium hydroxide solution, and add NH in the sodium hydroxide solution 3 ·H 2 O: ammonia water with NaOH=0.2. Add the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, the pH value is controlled between 10-12, the temperature is 50-60°C, filter and wash to the pH value of the washing water less than 8, dry at 120°C to get Ni 0.4 co 0.2 mn 0.4 (OH) 2 Precursor.

[0025] According to the molar ratio of Al / (Ni+Mn+Co)=0.02, Li / (Ni+Co+Mn+Al)=1.05, weigh nano-scale aluminum isopropoxide, lithium carbonate and the prepared precursor, and mix them uniformly for 4 hours , Put the uniformly mixed material into a sintering furnace for sintering, in the air atmosphere...

Embodiment 2

[0034] NiCl 2 、CoCl 2 , MnCl 2 Moore than Ni 2+ :CO 2+ :Mn 2+ = Mix in the ratio of 70:15:15, dissolve with deionized water, and make a solution with a comprehensive ion concentration of 2mol / L. Prepare 4mol / L sodium hydroxide solution, and add NH in the sodium hydroxide solution 3 ·H 2 O: ammonia water with NaOH=0.2. Put the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, the pH value is controlled between 10-12, the temperature is 50-60°C, filter and wash to the pH value of the washing water less than 8, dry at 120°C to get Ni 0.7 co 0.15 mn 0.15 (OH) 2 Precursor.

[0035]According to the molar ratio of Al / (Ni+Mn+Co)=0.02, Li / (Ni+Co+Mn+Al)=1.15, weigh nano-scale aluminum isopropoxide, lithium carbonate and the prepared precursor, and mix them uniformly for 4 hours , put the uniformly mixed materials into a sintering furnace for sintering, in an oxygen atm...

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Abstract

The invention relates to a preparation method of an aluminum-doped material of a cathode of a lithium ion battery with a solid phase process. The preparation method comprises the following steps: controlling certain reaction conditions to prepare a precursor of a nickel, cobalt and / or manganese hydroxide; uniformly mixing the precursor with a lithium salt and a nanometer aluminum compound; and carrying out high temperature processing for a certain period of time in an air or oxygen atmosphere, cooling, and crushing to obtain the aluminum-doped material of the cathode of the lithium ion battery with the solid phase process. The aluminum-doped material of the cathode of the lithium ion battery with the solid phase process which can substantially improve the safety performance and the cycle characteristic of the lithium ion battery at a high temperature can be applied to power batteries.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a method for preparing the positive electrode material of a lithium ion battery doped with aluminum. Background technique [0002] Lithium-ion batteries, which are widely used at present, are undergoing continuous updating and improvement of cathode materials. There are many systems of cathode materials for lithium-ion batteries, and the layered lithium cobalt oxide series (LiCoO 2 ), layered lithium nickel oxide series (LiNiO 2 ) and spinel-like lithium manganese oxide series (LiMn 2 o 4 ). However, there are significant deficiencies in the above-mentioned systems, which affect their practical application. Nickel-cobalt lithium manganate multi-component electrode material is a new type of positive electrode material for lithium-ion batteries developed in recent years. It concentrates LiCoO 2 , LiNiO 2 and LiMnO 2 The advantages of the three materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 王伟东王海涛
Owner 山东天骄新能源有限公司
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