A kind of preparation method of acicular spinel type lithium manganese oxide cathode material

A type of lithium manganate and positive electrode material technology, applied in the field of preparation of lithium ion battery positive electrode materials, can solve the problems of difficult and difficult product morphology, and achieve easy control of particle size and shape, low equipment requirements, and high efficiency Effect

Active Publication Date: 2017-04-12
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The above-mentioned preparation methods have certain difficulties in controlling the morphology of the products, especially the preparation of materials with special morphology such as needles is even more difficult.

Method used

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  • A kind of preparation method of acicular spinel type lithium manganese oxide cathode material
  • A kind of preparation method of acicular spinel type lithium manganese oxide cathode material
  • A kind of preparation method of acicular spinel type lithium manganese oxide cathode material

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Embodiment 1

[0045] A preparation method of the needle-shaped spinel-type lithium manganate cathode material of the present invention includes the following steps:

[0046] (1) Prepare lithium hydroxide as a lithium source, potassium permanganate as a manganese source, and sodium sulfite as a strong reducing agent, in which potassium permanganate is used as both a manganese raw material and a strong oxidant;

[0047] (2) The potassium permanganate and lithium hydroxide obtained in step (1) are added to the aqueous solution and mixed uniformly, and then the mixed aqueous solution is added to the reactor, and sodium sulfite is added to the reactor. The molar ratio of the reaction amount of lithium hydroxide, potassium permanganate and sodium sulfite is n(LiOH): n(KMnO 4 ):n(Na 2 SO 4 )=3:2:3.5, the reaction temperature is 84°C, the reaction time is 3 hours, and the stirring method is magnetic stirring; the specific reactions that occur during the reaction are as follows: (1) 2KMnO 4 +3Na 2 SO 3 +H...

Embodiment 2

[0053] A preparation method of the needle-shaped spinel-type lithium manganate cathode material of the present invention includes the following steps:

[0054] (1) Prepare lithium hydroxide as a lithium source, potassium permanganate as a manganese source, and sodium sulfite as a strong reducing agent, in which potassium permanganate is used as both a manganese raw material and a strong oxidant;

[0055] (2) The potassium permanganate and lithium hydroxide obtained in step (1) are added to the aqueous solution and mixed uniformly, and then the mixed aqueous solution is added to the reactor, and sodium sulfite is added to the reactor. The molar ratio of the reaction amount of lithium hydroxide, potassium permanganate and sodium sulfite is n(LiOH): n(KMnO 4 ):n(Na 2 SO 4 )=4:2:3.5, the reaction temperature is 64°C, the reaction time is 8 hours, and the stirring method is magnetic stirring; the specific reactions that occur during the reaction are as follows: (1) 2KMnO 4 +3Na 2 SO 3 +H...

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Abstract

The invention discloses a preparation method of a needle-like spinel lithium manganese oxide positive electrode material. The preparation method comprises the steps of preparing raw materials comprising lithium sources and manganese sources, a strong oxidant and a strong reducing agent at first; evenly mixing the raw materials in a water solution according to a certain molar ratio, adding the strong oxidant and the strong reducing agent into the solution, and obtaining mixed slurry after a sufficient reaction; filtering, washing and drying the mixed slurry to obtain a precursor; finally, placing the precursor in air or oxygen-enriched atmosphere for primary sintering or secondary sintering to obtain the needle-like spinel lithium manganese oxide positive electrode material. The preparation method has the advantages that the technology is simple and easy to control, and production efficiency is high, and the obtained product is uniform in ingredient, stable in quality and excellent in physical and chemical performance and electric performance.

Description

Technical field [0001] The invention relates to a preparation method of a lithium ion battery positive electrode material, in particular to a preparation method of a spinel type lithium manganate positive electrode material. Background technique [0002] Lithium-ion batteries are a new generation of green and environmentally friendly batteries, and its cathode material is one of the key materials for manufacturing lithium-ion batteries (see Zhang SS, Read J AA new direction for the performance improvement of rechargeable lithium / sulfur batteries[J]. Journal of Power Sources ,2412,244:77-82.). The cathode materials currently used and studied mainly include lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium iron phosphate (LiFePO 4 ) And spinel lithium manganate (LiMn 2 O 4 ) And other materials. LiCoO 2 Although the material has been commercialized earlier, it has been gradually restricted due to its high cost, poor safety under high temperature conditions, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12H01M4/505
CPCY02E60/10
Inventor 廖达前习小明周春仙
Owner CHANGSHA RES INST OF MINING & METALLURGY
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