Preparation method for saline solution doped with oxide of anode material of lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor high temperature safety performance and cycle performance, slow solid-phase diffusion, and low bulk density of powder materials. Achieve the effect of good cycle characteristics and excellent high temperature stability

Inactive Publication Date: 2013-03-13
深圳市天骄科技开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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] The positive electrode material obtained by the above co-precipitation method is suitable for general batteries. For power batteries, the high temperature safety performance and cycle performance are not very good

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  • Preparation method for saline solution doped with oxide of anode material of lithium ion battery
  • Preparation method for saline solution doped with oxide of anode material of lithium ion battery

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Embodiment 1

[0024] NiSO 4 、CoSO 4 , MnSO 4 Moore than Ni 2+ :CO 2+ :Mn 2+ =5:2-0.2:3 mixed in a ratio of 5:2-0.2:3, dissolved in deionized water, adding nano-sized aluminum oxide into the solution according to Ni::Co:Mn:Al=5:2-0.2:3:0.2 to form A salt solution with a combined concentration of 2 mol / L. Prepare 4mol / L sodium hydroxide solution, and add NH in the sodium hydroxide solution 3 : Ammonia water with NaOH=0.2. Add the two mixed solutions into the reaction kettle in parallel, and control the reaction in a continuous reaction mode. The pH value is controlled between 10.0-12, and the temperature is 50-60°C. When the particle size meets the requirements, filter, wash, and dry to obtain Ni 0.5 co 0.18 mn 0.3 (OH) 2 ﹒ (Al 2 o 3 ) 0.01 Precursor.

[0025] Weigh lithium carbonate and aluminum-doped precursors according to the molar ratio of Li / (Ni+Co+Mn+Al) = 1.1, mix uniformly for 4 hours, put the uniformly mixed materials into a sintering furnace for sintering, and heat a...

Embodiment 2

[0029] NiCl, CoCl, mole ratio Ni 2+ :CO 2+ :Mn 2+ =7:1.5-0.2:1.5, mix with deionized water, add nano-scale aluminum oxide into the solution according to Ni::Co:Mn:Al=7:1.5-0.2:1.5:0.2 to form a composite A solution with an ion concentration of 2 mol / L. Prepare a 2mol / L sodium hydroxide solution, and add NH to the sodium hydroxide solution 3 : Ammonia water with NaOH=0.2. Add the two mixed solutions into the reaction kettle in parallel, and control the reaction in a continuous reaction mode. The pH value is controlled between 10.0-12, and the temperature is 50-60°C. When the particle size reaches the requirement, filter, wash, and dry to obtain Ni 0.70 co 0.13 mn 0.15 (OH) 2 ﹒ (Al 2 o 3 ) 0.01 Precursor.

[0030] According to the molar ratio of Li / (Ni+Co+Mn+Al) = 1.05, lithium hydroxide and the precursor coated with doped aluminum were weighed, mixed uniformly for 4 hours, and the uniformly mixed materials were put into a sintering furnace for sintering. Raise the ...

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Abstract

The invention discloses a preparation method for a saline solution doped with an oxide of an anode material of a lithium ion battery. The preparation method comprises the following steps of: firstly, mixing soluble salts of nickel, cobalt and manganese in appropriate mole ratio, dissolving by water, then directly adding a nanoscale oxide to be doped to the saline solution according to a regulated proportion, then carrying out precipitation reaction with an aqueous alkali to form precursor particles, and then, washing, drying to obtain nickel, cobalt and / or manganese hydroxide precursors doped with the oxide; then, mixing with a lithium salt; and finally, sintering the particles obtained at a high temperature, cooling to room temperature, smashing and sieving to obtain the anode material of the lithium ion battery doped with the oxide. The oxide M can be selected from Al2O3, MgO or Cr2O3. The invention further discloses the anode material of the lithium ion battery obtained by the anode material prepared by the method. As the anode material of the lithium ion battery provided by the invention is doped by way of the saline solution, comparatively uniform doped products can be easily obtained in the doping process. Experiments show that the anode material prepared by the method has superior high temperature stability and good circulating characteristics.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a preparation method of an oxide-doped nickel-cobalt-manganese ternary material. 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 materials have attracted e...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M4/131
CPCY02E60/122Y02E60/10
Inventor 丁倩倩王伟东
Owner 深圳市天骄科技开发有限公司
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