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Preparation method of transition metal hydroxide and oxides thereof and positive pole materials

A transition metal and hydroxide technology, applied in chemical instruments and methods, nickel oxide/nickel hydroxide, manganese oxide/manganese hydroxide, etc., can solve the problem that the tap density of positive electrode materials is not high enough to meet high specific capacity Battery and other problems, to achieve the effect of regular shape, uniform particle distribution, and smooth surface

Inactive Publication Date: 2009-12-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tap density of the positive electrode material prepared by the transition metal hydroxide obtained by the existing co-precipitation technology is not high enough to meet the needs of batteries with high specific capacity.

Method used

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  • Preparation method of transition metal hydroxide and oxides thereof and positive pole materials
  • Preparation method of transition metal hydroxide and oxides thereof and positive pole materials
  • Preparation method of transition metal hydroxide and oxides thereof and positive pole materials

Examples

Experimental program
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Embodiment 1

[0033] This example is used to illustrate the method for preparing transition metal hydroxide provided by the present invention.

[0034] (1) prepare the water-soluble salt solution of transition metal: the ascorbic acid of 0.5 mol / liter nickel sulfate, 0.5 mol / liter manganese sulfate and 0.01 mol / liter;

[0035] (2) prepare alkaline solution: 2.0 mol / liter sodium hydroxide, 0.4 mol / liter ammonia and 0.2 mol / liter sodium thiosulfate and 0.1 mol / liter sodium sulfite;

[0036] (3) Join the saline solution prepared by step (1) with a speed of 25 ml / min into the reactor with argon with a peristaltic pump; add the alkali solution prepared by step (2) dropwise to the reactor with a peristaltic pump , and detect the pH value of the reaction system by a pH controller, control the speed of dropping the alkali solution, keep the pH value of the reaction system at about 10, and keep the temperature of the reaction system at 30°C. After 12 hours of feeding, the reaction mixture Reaction ...

Embodiment 2

[0038] This example is used to illustrate the method for preparing transition metal oxides provided by the present invention.

[0039] With the hydroxide Ni that embodiment 1 obtains 0.5 mn 0.5 (OH) 2 Place in a calciner and calcinate at 600°C for 5 hours to obtain Ni 0.5 mn 0.5 o 1.5 .

Embodiment 3

[0041] This example is used to illustrate the method for preparing transition metal hydroxide provided by the present invention.

[0042] (1) Preparation of salt solution: 0.5 mol / liter of nickel sulfate, 0.5 mol / liter of manganese sulfate, 0.5 mol / liter of cobalt sulfate and 0.3 mol / liter of ascorbic acid;

[0043] (2) prepare alkali solution: 3.0 mol / liter potassium hydroxide, 3.0 mol / liter ammoniacal liquor and 1.5 mol / liter sodium sulfite;

[0044] (3) drip the salt solution prepared by step (1) with a speed of 25 ml / min into the reactor with nitrogen gas with a peristaltic pump; add the alkali solution prepared by step (2) dropwise with a peristaltic pump in the reactor , and the pH value of the reaction system is detected by a pH controller, and the drop rate of the alkali solution is controlled, so that the pH value of the reaction system is kept at about 11 and the temperature of the reaction system is 40 ° C, and the feeding time is 10 hours. , the reaction mixture w...

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Abstract

The invention provides a preparation method of transition metal hydroxides, comprising the following step: contacting a water-soluble salt solution and a lye solution of transition metal in inert atmosphere , wherein the lye solution also contains an additive which is selected from one or several of sodium thiosulfate, sodium sulfite and hydrazine hydrate. The invention also provides a preparation method of transition metal oxides, comprising the following step: calcining the transition metal hydroxides with the presence of oxygen gas, wherein the transition metal hydroxides are prepared by the method. The invention also provides a preparation method of lithium ion battery positive pole materials. The transition metal hydroxides and the transition metal oxides which are prepared by the methods are uniformly distributed, and the tap density of the lithium ion battery positive pole materials prepared by the transition metal hydroxides or the transition metal oxides prepared by the method is higher.

Description

technical field [0001] The invention relates to a preparation method of a transition metal hydroxide and an oxide thereof and a preparation method for preparing a positive electrode material of a lithium ion battery from the transition metal hydroxide and an oxide thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long life, no memory effect, and low pollution. They are the mainstream products of chemical power sources and are widely used in mobile communication equipment and military fields. The electrochemical performance of lithium-ion batteries mainly depends on the performance of the electrode materials and electrolyte materials used, especially the performance of the electrode materials. [0003] At present, the cathode materials used in the production of commercial lithium-ion batteries are mainly layered LiCoO 2 and LiNiO 2 The preparation process is simple, the performance is stable, the specific capacity is high and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G45/02C01G51/04H01M4/48
CPCC01G51/00C01G53/50C01G53/42C01P2006/40C01G51/50C01G45/02C01P2004/03C01P2004/51C01P2002/54C01G53/04C01G53/006C01P2006/11C01G53/00C01P2004/61C01G45/1228
Inventor 夏文强徐茶清姜占锋
Owner BYD CO LTD