Preparation method of aluminum-doped cobaltosic oxide

A technology of cobalt tetroxide and cobalt carbonate, which is applied in the field of preparation of aluminum-doped cobalt tetroxide, can solve problems such as unproposed solutions, and achieve the effect of uniform particles

Pending Publication Date: 2020-09-11
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some cobalt tetroxide manufacturers have gradually begun to pay atten...

Method used

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  • Preparation method of aluminum-doped cobaltosic oxide
  • Preparation method of aluminum-doped cobaltosic oxide
  • Preparation method of aluminum-doped cobaltosic oxide

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Embodiment 1

[0031] A kind of preparation method of aluminum-doped cobalt tetroxide described in this embodiment, the specific steps are as follows:

[0032] Step 1. Prepare the solution: the concentration of the aluminum-doped cobalt sulfate solution is 2.4 mol / L, the mass ratio of aluminum-cobalt element in it is 0.014, and the concentration of the ammonium bicarbonate solution is 2.8 mol / L.

[0033] Step 2, crystal seed synthesis: inject pure water into the reaction kettle and add the low-concentration ammonium bicarbonate solution after mixing and diluting the ammonium bicarbonate solution in step 1 as the bottom liquid, the bottom liquid volume is 6%, and the ammonium bicarbonate concentration in the bottom liquid 40 g / L, the pH value of the bottom solution was controlled at 8.3. At a high stirring speed of 500rpm, the aluminum-cobalt solution and ammonium bicarbonate solution configured in step 1 are simultaneously pumped into the reactor in a certain proportion. The capacity is 16%...

Embodiment 2

[0039] A kind of preparation method of aluminum-doped cobalt tetroxide described in this embodiment, the specific steps are as follows:

[0040] Step 1. Prepare the solution: the concentration of the aluminum-cobalt chloride solution is 2.2 mol / L, the mass ratio of the aluminum-cobalt element in it is 0.00972, and the concentration of the ammonium bicarbonate solution is 2.7 mol / L.

[0041]Step 2, crystal seed synthesis: Inject pure water into the reactor and add the low-concentration ammonium bicarbonate solution after mixing and diluting the ammonium bicarbonate solution in step 1 as the bottom liquid, the bottom liquid volume is 10%, and the ammonium bicarbonate concentration in the bottom liquid 30 g / L, and the pH value of the bottom solution was controlled at 8.0. At a high stirring speed of 400rpm, the aluminum-cobalt solution and ammonium bicarbonate solution configured in step 1 are simultaneously pumped into the reactor in a certain proportion. The capacity is 30%, t...

Embodiment 3

[0047] A kind of preparation method of aluminum-doped cobalt tetroxide described in this embodiment, the specific steps are as follows:

[0048] Step 1. Prepare the solution: the concentration of the aluminum-doped cobalt sulfate solution is 1.5 mol / L, the mass ratio of the aluminum-cobalt element in it is 0.0083, and the concentration of the ammonium bicarbonate solution is 2.5 mol / L.

[0049] Step 2. Synthesis of seed crystals: Inject pure water into the reaction kettle and mix and dilute the low-concentration ammonium bicarbonate solution in step 1 as the bottom liquid. The volume of the bottom liquid is 20%, and the concentration of ammonium bicarbonate in the bottom liquid is 20 g / L, the pH value of the bottom solution was controlled at 7.8. At a high stirring speed of 320 rpm, the aluminum-cobalt solution and ammonium bicarbonate solution configured in step 1 are simultaneously pumped into the reactor in a certain proportion, the molar ratio of cobalt salt and ammonium b...

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Abstract

The invention relates to the technical field of battery material preparation, in particular to a preparation method of aluminum-doped cobaltosic oxide. The preparation method specifically comprises the following steps of: step 1, solution preparation: preparing an aluminum-doped cobalt solution and an ammonium bicarbonate solution; step 2, seed crystal synthesis; step 3, growing of cobalt carbonate; step 4, washing and drying; step 5, calcining; and step 6, mixing and packaging. According to the preparation method of the aluminum-doped cobaltosic oxide, the prepared aluminum-doped cobaltosic oxide is uniform in particle and free of compact blocky particles and particle aggregates.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a method for preparing aluminum-doped tricobalt tetroxide. Background technique [0002] With the upgrading of 3C products and the introduction of various high-end wearable devices, people's requirements for lithium-ion batteries are getting higher and higher. Cathode material manufacturers often mix large and small particles to increase the compaction density of the positive electrode, thereby improving the lithium-ion battery. energy density. Cobalt tetroxide is an important precursor for the preparation of lithium cobalt oxide, a cathode material for lithium batteries, and its various indicators affect the performance of lithium cobalt oxide cathode materials and downstream lithium-ion batteries. Recently, manufacturers of lithium cobaltate cathode materials not only put forward higher requirements on the traditional indicators of cobalt tetroxide such as...

Claims

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Application Information

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IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/03C01P2004/61C01P2006/80
Inventor 夏勇田礼平刘人生胡招文熊铜兴秦才胜祝婷张琳琳
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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