Nickel and cobalt binary anode material precursor preparing method and nickel and cobalt binary anode material precursor prepared through method

A cathode material and precursor technology, which is applied in the field of nickel-cobalt binary cathode material precursors, can solve the problems of easy aggregation of precursor particles, flake or polygonal shape, uneven distribution of material particle size and shape, and achieve surface morphology Good, high tap density, effect of increasing voltage

Active Publication Date: 2015-07-15
HUNAN RESHINE NEW MATERIAL
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Problems solved by technology

[0004] The invention provides a method for continuously preparing the precursor of nickel-cobalt binary positive electrode material and the precursor of nickel-cobalt binary positive electrode material obtained by the method, so as to solve the problem that the precursor particles in the prior art are easy to agglomerate, and are in the form of flakes or multiple Angular shape, poor physical properties, uneven particle size distribution of the obtained material, and technical problems that the reaction cannot be continuous

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  • Nickel and cobalt binary anode material precursor preparing method and nickel and cobalt binary anode material precursor prepared through method
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[0032] The invention provides a method for preparing a nickel-cobalt binary cathode material precursor, comprising the following steps:

[0033] Micropowder elimination step: the aqueous solution for nucleation containing at least a nickel-containing ion donor and a cobalt-containing ion donor is controlled so that the pH value at a liquid temperature of 30°C is 10.2 to 12.5, thereby eliminating fine powder in the reaction solution. Micropowder, to obtain the nucleation base solution in which the crystal nucleus particle size is normally distributed; and

[0034] Particle growth process: Control the nucleation base solution so that the pH value at 30°C is 10.2 to 12.5, so that the nuclei in the nucleation base solution grow and obtain a nickel-cobalt binary cathode material precursor .

[0035] The method improves the conventional co-precipitation method, and first controls the pH value of the reaction to be 10.2-12.5 through the micropowder elimination process, so that the r...

Embodiment 1

[0058]1. Soluble nickel sulfate and cobalt sulfate are dissolved in pure water according to the ratio of nickel and cobalt elements to 1:1, and the nickel-cobalt mixed solution with a molar concentration of metal elements of 1.0mol / L is prepared, and 10wt.% Ammonia solution as complexing agent.

[0059] 2. The micropowder elimination reaction kettle uses pure water as the bottom liquid, the temperature is raised to 30°C, the stirring speed is controlled at 150r / min, and the molar concentration of ammonium ions in the bottom liquid is adjusted to 0.05mol / L by adding ammonium sulfate, and the pH of the bottom liquid is The value is controlled at 10.20 under the liquid temperature reference of 30°C.

[0060] 3. Add nickel salt and cobalt salt mixed solution, 10wt.% sodium hydroxide solution, and ammonia solution into pure water in parallel with 3 metering pumps, the flow rate of nickel-cobalt mixture is 100ml / min, and the flow rate of ammonia solution Control to ensure that the ...

Embodiment 2

[0066] 1. Soluble nickel chloride and cobalt chloride are dissolved in pure water according to the ratio of nickel and cobalt elements to 4:1, and the nickel-cobalt mixed solution with a molar concentration of metal elements of 3.0mol / L is prepared, and 30wt.% ammonium chloride solution as complexing agent.

[0067] 2. The micropowder elimination reaction kettle uses pure water as the bottom liquid, the temperature rises to 80°C, the stirring speed is controlled at 900r / min, and the molar concentration of ammonium ions in the bottom liquid is adjusted to 0.15mol / L by adding ammonium sulfate, and the pH of the bottom liquid is The value is controlled at 12.50 under the liquid temperature reference of 30°C.

[0068] 3. Add nickel salt and cobalt salt mixed solution, 30wt.% sodium hydroxide solution, and ammonium chloride solution into pure water in parallel with 3 metering pumps. The flow rate of nickel-cobalt mixed solution is 800ml / min. The flow rate control of the ammonium s...

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Abstract

The invention provides a nickel and cobalt binary anode material precursor preparing method and a nickel and cobalt binary anode material precursor prepared through the method. According to the nickel and cobalt binary anode material precursor preparing method, the pH value of a solution at the early stage of a reaction is regulated so that the grain size of a nickel and cobalt binary anode material precursor crystal nucleus in the obtained solution can be in normal distribution, then a subsequent reaction is performed with the obtained solution as a base solution, subsequent preparing conditions are regulated, and therefore the grain size of the crystal nucleus is increased in a balanced mode under the distribution condition, and the grain size of the nickel and cobalt binary anode material precursor prepared through the method can be in normal distribution.

Description

technical field [0001] The invention relates to the field of preparation of nickel-cobalt binary positive electrode material precursors, in particular to a method for preparing nickel-cobalt binary positive electrode material precursors and the method for preparing nickel-cobalt binary positive electrode material precursors. Background technique [0002] The new energy automobile industry has developed rapidly in the past ten years. The power battery materials mainly include lithium manganese oxide, ternary lithium and lithium iron phosphate. Due to the poor conductivity of lithium iron phosphate, it needs to be doped with other materials, the tap density is low, the specific capacity is relatively small, the process requirements are strict and special, the manufacturing is difficult, and the research and development of supporting electrolyte is slightly behind. Therefore, the industrialization of lithium iron phosphate power batteries The process is relatively slow. Compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/1397
CPCH01M4/1397H01M4/362H01M4/525H01M10/052Y02E60/10
Inventor 黄海翔池田一崇宋文锋公伟伟宋振伟陈敏
Owner HUNAN RESHINE NEW MATERIAL
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