Preparation of a transition metal oxide cathode material and its application in sodium-ion batteries

A technology of sodium ion batteries and transition metals, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that it is difficult to directly prepare layered transition metal oxide cathode materials, and achieve excellent rate performance and cycle performance. Effects of discharge capacity and high conductivity

Active Publication Date: 2022-05-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods are difficult to directly prepare layered transition metal oxide cathode materials with special morphology (microspheres, nanowires, etc.)

Method used

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  • Preparation of a transition metal oxide cathode material and its application in sodium-ion batteries
  • Preparation of a transition metal oxide cathode material and its application in sodium-ion batteries
  • Preparation of a transition metal oxide cathode material and its application in sodium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: (MnO 2 Preparation of Na by Nanowire Template Method 2 / 3 Fe 1 / 2 Mn 1 / 2 O 2 Nanowires)

[0021] Weigh 0.822g potassium permanganate and 0.278g ammonium chloride, add them to a 250mL hydrothermal kettle, add 195ml deionized water, and react at 140°C for 36h. The obtained mixed solution was centrifuged, washed three times with deionized water and ethanol, and then placed in an oven at 120 °C for 8 h to obtain MnO 2 Nanowires. The obtained MnO was mixed in a molar ratio of 4:3:3 (Na:Fe:Mn) 2 The nanowires were dispersed into a mixed solution of ferric nitrate and sodium carbonate, a stirrer was added, the solvent was evaporated in a water bath at 80°C, and then placed in an oven at 100°C for 12 hours to obtain precursor A. The precursor A was pre-sintered at 350 °C for 2 h in an air atmosphere, and sintered at a high temperature of 900 °C for 12 h. After cooling, the cathode material Na was obtained. 2 / 3 Fe 1 / 2 Mn 1 / 2 O 2 nanowires, as attached fig...

Embodiment 2

[0022] Embodiment 2: (MnO 2 Preparation of Na by Microsphere Template Method 2 / 3 Fe 1 / 2 Mn 1 / 2 O 2 Microspheres)

[0023] Weigh 0.507g of manganese sulfate and 2.371g of ammonium bicarbonate, dissolve them into 210ml of deionized water, add 21ml of ethanol to the manganese sulfate solution, quickly pour the ammonium bicarbonate solution into the manganese sulfate solution, and stir at room temperature for 3 hours. The obtained suspension was centrifuged, washed three times with deionized water and ethanol, and then placed in an oven at 100 °C for 12 h to obtain MnCO 3 Microspheres. The resulting MnCO 3 The microspheres were sintered at 400 °C for 5 h to obtain MnO 2 Microspheres. The obtained MnO was mixed in a molar ratio of 4:3:3 (Na:Fe:Mn) 2 The microspheres were dispersed into a mixed solution of ferric nitrate and sodium carbonate, a stirrer was added, the solvent was evaporated in a water bath at 80°C, and then placed in an oven at 100°C for 12 hours to obtain p...

Embodiment 3

[0024] Embodiment 3: (Fe 3 O 4 Preparation of Na by Microsphere Template Method 2 / 3 Fe 1 / 2 Mn 1 / 2 O 2 Microspheres)

[0025] Weigh 0.947g of ferric chloride, 2.46g of urea, 2.5g of ascorbic acid, and 2g of PVP (molecular weight: 40000), add them to a 100mL hydrothermal kettle, add 80ml of deionized water, and react at 160°C for 6h. The obtained mixed solution was centrifuged, washed three times with deionized water and ethanol, and then placed in an oven at 60 °C for 8 h to obtain FeCO 3 Microspheres. The resulting MnCO 3

[0026] The microspheres were sintered at 400 °C for 5 h to obtain Fe 3 O 4 Microspheres. The obtained Fe was converted into a molar ratio of 4:3:3 (Na:Fe:Mn) 3 O 4 The microspheres were dispersed into a mixed solution of manganese acetate and sodium carbonate, a stirrer was added, the solvent was evaporated in a water bath at 80°C, and then placed in an oven at 100°C for 12 hours to obtain precursor A. The precursor A was pre-sintered at 350 °C ...

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Abstract

The invention relates to a transition metal oxide cathode material and its preparation and application, the composition of the cathode material is Na x A y B z o 2 . Na of the present invention x A y B z o 2 It is prepared by metal oxide template-high temperature solid phase method, using metal oxide with special morphology as template, no need to introduce additional template, no post-treatment process such as template removal, simple and easy. Na x A y B z o 2 The microspheres can relieve the mechanical stress generated during the intercalation and extraction of sodium ions, reduce the contact area between the active material and the electrolyte, thereby improving the structural stability and cycle stability of the material. Na x A y B z o 2 Nanowires have shorter ion transport paths, higher electrical conductivity, and stronger strain adaptability, thus exhibiting higher discharge capacity and cycle stability. Prepared Na x A y B z o 2 The microspheres and nanowires have passed the electrochemical performance test, showing high discharge specific capacity and excellent rate performance and cycle performance.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for sodium ion batteries, in particular to a preparation method and application of a transition metal oxide positive electrode material for sodium ion batteries with special morphology. Background technique [0002] With the development of society, the problems of energy shortage and environmental pollution caused by excessive consumption of fossil energy are becoming more and more serious, which seriously affects the sustainable development of human society. Therefore, vigorously developing solar energy, wind energy, tidal energy and other renewable energy has become an inevitable trend. However, renewable energy generation (wind energy, solar energy, etc.) is discontinuous and unstable, and it is difficult to connect to the grid for utilization. Therefore, large-scale energy storage technology is the bottleneck technology to realize the popularization and application of renewable ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/054
CPCH01M4/48H01M10/054Y02E60/10
Inventor 郑琼吕志强张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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