Preparation method of spherical hydroxyl cobaltous oxide-cobaltosic oxide composite material

A technology of cobalt oxyhydroxide and tricobalt tetroxide, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high cut-off voltage, strong structural stability, low vibration, etc., and achieves low cost, simple preparation process, and good electricity. Effects of chemical properties

Active Publication Date: 2015-06-17
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current lithium cobaltate precursors, tricobalt tetroxide, are low-tapped and loose, which cannot meet the strong structural stability required for high cut-off voltage.

Method used

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  • Preparation method of spherical hydroxyl cobaltous oxide-cobaltosic oxide composite material
  • Preparation method of spherical hydroxyl cobaltous oxide-cobaltosic oxide composite material
  • Preparation method of spherical hydroxyl cobaltous oxide-cobaltosic oxide composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The production steps are as follows:

[0025] 1. Raw material preparation

[0026] Add an appropriate amount of 10.0mol / L NaOH solution into the lye preparation tank, add a corresponding amount of pure water into the tank according to the final concentration of 5.0mol / L, use a circulating pump to make the concentration of lye in the tank uniform, and check the concentration of lye After the range of 5.0±0.1mol / L, put the lye into the lye feeding tank.

[0027] Add an appropriate amount of CoSO to the cobalt liquid preparation tank 4 Solution, after detecting the concentration of metal Co, add a corresponding amount of pure water to the tank according to the final Co concentration of 1.7mol / L, and circulate to make the concentration uniform. The cobalt liquid (ie cobalt salt solution) is poured into the cobalt liquid transfer tank. In the cobalt liquid transfer tank, add complexing agent and auxiliary agent, the concentration is (1kg auxiliary agent+4kgEDTA-2Na) / m 3 ...

Embodiment 2

[0037] The production steps of this example are basically the same as in Example 1, only the following indicators are different: the cobalt liquid flow rate is 210±2L / h, the stirring is controlled at 210±1rpm, and the air flow rate is 20m 3 / h, the concentration of adding complexing agent and auxiliary agent is (2kg auxiliary agent+10kgEDTA-2Na) / m 3 (The mass ratio of triethanolamine to ascorbic acid in the auxiliary agent is 0.2:1). After synthesis, cyclone classification, pressure filtration, washing and drying, the sample was obtained, with a D50 of 15.3 μm and a tap density of 2.79 g / cm 3 , a large-sized spherical cobalt oxyhydroxide-cobalt tetroxide composite sample with a cobalt content of 69.1%.

Embodiment 3

[0039] The production steps of this example are basically the same as in Example 1, only the following indicators are different: the cobalt liquid flow rate is 100±1L / h, the stirring is controlled at 170±1rpm, and the air flow rate is 12m 3 / h, the concentration of adding complexing agent and auxiliary agent is (0.5kg auxiliary agent+4kgEDTA-2Na) / m 3 (The mass ratio of triethanolamine to ascorbic acid in the auxiliary agent is 0.8:1). After synthesis, cyclone classification, pressure filtration, washing and drying, the sample was obtained, with a D50 of 21.8 μm and a tap density of 2.93 g / cm 3 , a large-sized spherical cobalt oxyhydroxide-cobalt tetroxide composite sample with a cobalt content of 68.9%.

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Abstract

The invention discloses a preparation method of a precursor of a positive material for a lithium ion battery, namely a spherical hydroxyl cobaltous oxide-cobaltosic oxide composite material. Existing lithium cobalt oxide precursor cobaltosic oxide is low in compaction and loose and cannot satisfy strong structural stability required by high cutoff voltage. The preparation method comprises the following steps: adding a complexing agent and an auxiliary into a cobalt salt solution at the same time; stirring uniformly to obtain a mixed solution; flowing the solution with alkaline liquor in parallel into a reaction kettle; adding a proper amount of an oxidizing agent; and synthesizing spherical hydroxyl cobaltous oxide with a certain pH value and at a reaction temperature and a stirring rotating speed.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a method for preparing a spherical cobalt oxyhydroxide-cobalt trioxide composite material precursor of a high voltage lithium ion battery positive electrode material. Background technique [0002] In recent years, the functions of electronic products have increased day by day, and people began to expect electronic products to have a longer standby time. Therefore, high-capacity lithium-ion batteries have gradually become a research hotspot. In order to obtain a higher capacity, increasing the charging cut-off voltage of the lithium battery is a more effective and practical way. Today, the cut-off voltage of lithium batteries on the market has been raised from 4.2 to 4.3V, and 4.35V has also been applied to high-end models of iPhone, Samsung, Huawei and other brands. The focus of research has now turned to the charging cut-off voltage of 4.4 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/139
CPCY02E60/10
Inventor 刘茨梅陈要忠程中原
Owner ZHEJIANG HUAYOU COBALT
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