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Preparation method of positive active material hollow spherical lithium manganate of lithium ion battery

A positive electrode active material, spherical lithium manganese oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficulty in ensuring uniform mixing of reaction raw materials, uneven size and structure of products, and damage to the structure of reaction raw materials

Inactive Publication Date: 2015-05-06
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The grinding and mixing of raw materials in the traditional solid-state reaction method will not only damage the structure of the reaction raw materials, but also make it difficult to ensure that the reaction raw materials are mixed evenly, and the size and structure of the final product are not uniform, which affects the performance

Method used

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  • Preparation method of positive active material hollow spherical lithium manganate of lithium ion battery
  • Preparation method of positive active material hollow spherical lithium manganate of lithium ion battery
  • Preparation method of positive active material hollow spherical lithium manganate of lithium ion battery

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Effect test

Embodiment 1

[0025] 1. Preparation of hollow manganese dioxide spheres: 3.0g of MnSO 4 ·H 2 O was added to 30ml deionized water, and 4g of K 2 S 2 o 8 Dissolve in 35ml of deionized water, then mix the two solutions, stir evenly with a mechanical stirrer, add 3ml of concentrated sulfuric acid dropwise, transfer to a stainless steel reaction kettle lined with polytetrafluoroethylene, react at a temperature of 110°C for 8 hours, and then Centrifuge to obtain a solid phase, wash and dry the solid phase to obtain hollow manganese dioxide spheres.

[0026] 2. Preparation of hollow spherical lithium manganate: take Li with a concentration of 0.1 mol / L 2 CO 3 40ml of aqueous solution, then add 0.2g of manganese dioxide spheres, continue ultrasonic treatment for 30 minutes, the conditions of ultrasonic treatment are: 50KHz, then dry ethanol, and then calcined at 700°C for 6h, the final product is hollow spherical lithium manganate.

Embodiment 2

[0028] 1. Preparation of hollow manganese dioxide spheres: 1.5g of MnSO 4 ·H 2 O was added to 25ml deionized water, and 3g of K 2 S 2 o 8 Dissolve in 30ml of deionized water, then mix the two solutions, stir evenly with a mechanical stirrer, add 2ml of concentrated sulfuric acid dropwise, transfer to a stainless steel reaction kettle lined with polytetrafluoroethylene, react at 110°C for 8 hours, and then Centrifuge to obtain a solid phase, wash and dry the solid phase to obtain hollow manganese dioxide spheres.

[0029] 2. Preparation of hollow spherical lithium manganese oxide: Take 40ml of LiCl aqueous solution with a concentration of 0.1 mol / L, then add 0.2g of manganese dioxide balls, and continue ultrasonication for 25 minutes. The conditions of ultrasonic treatment are: 50KHz, then dry ethanol, and then 750 Calcined at ℃ for 6h, the final product is hollow spherical lithium manganate.

Embodiment 3

[0031] 1. Preparation of hollow manganese dioxide spheres: mix 1.0g of MnSO 4 ·H 2 O was added to 15ml of deionized water, and 2g of K 2 S 2 o 8 Dissolve in 15ml of deionized water, then mix the two solutions, stir evenly with a mechanical stirrer, add 2ml of concentrated sulfuric acid dropwise, transfer to a stainless steel reaction kettle lined with polytetrafluoroethylene, react at 110°C for 6 hours, The solid phase is obtained by centrifugation, and the solid phase is washed and dried to obtain hollow manganese dioxide spheres.

[0032] 2. Preparation of hollow spherical lithium manganate: take LiOH·H with a concentration of 0.2 mol / L 2 O aqueous solution 20ml, then add manganese dioxide spheres 0.1g, continue ultrasonication for 25 minutes, the conditions of ultrasonic treatment are: 50KHz, then dry ethanol, and then calcined at 500°C for 5h, the final product is hollow spherical lithium manganate.

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Abstract

The invention relates to a preparation method of positive active material hollow spherical lithium manganate of a lithium ion battery, and belongs to the technical field of a chemical battery. The method comprises the steps of uniformly mixing a manganese sulfate aqueous solution with a potassium persulfate aqueous solution, adding concentrated sulfuric acid, carrying out hydrothermal reaction, then centrifuging the mixed solution, taking out solid phase, and washing and drying the solid phase to obtain spinous hollow manganese dioxide spheres; mixing soluble lithium salt and the spinous hollow manganese dioxide spheres to obtain a mixture I, ultrasonically processing, drying and burning the mixture I to obtain hollow spherical lithium manganate. The prepared spherical lithium manganate belongs to a spinel type, the diameter of the spherical lithium manganate is 0.5 to 5 micrometers, the degree of crystallinity is good, the spherical lithium manganate is mainly formed by clustering and assembling spinous nanowires, a large clearance is formed between two adjacent nanowires, a porous structure is formed inside the spherical lithium manganate, the lithium atom density is reasonable, the activity is low, the chemical stability is high, adequate contact when the lithium salt is dissolved and the lithium manganate is synthesized in the later period can be facilitated, the insertion and separation of lithium ions can be facilitated, and the electrochemical cycling reversibility and stability of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and in particular relates to a preparation method of a hollow spherical lithium manganate cathode material. Background technique [0002] Lithium manganate is mainly spinel lithium manganate, spinel lithium manganate LiMn 2 o 4 It is the positive electrode material with three-dimensional lithium ion channels that Hunter first produced in 1981. It has been greatly concerned by many scholars and researchers at home and abroad. The theoretical capacity is 148mA·h / g, and the voltage platform is 3.7V. As an electrode material, it has the advantages of low price, high potential, environmental friendliness, and high safety performance, and is the most promising substitute for lithium cobaltate LiCoO 2 Become the cathode material of a new generation of lithium-ion batteries. But the spinel LiMn 2 o 4 Most of them are prone to structural transformation during material synthesis and charge-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCY02E60/10
Inventor 刁国旺倪鲁彬童俊笙李忠翠吴震王世双余洋童晶晶
Owner YANGZHOU UNIV
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