Positive electrode material for sodium-ion battery and preparation method thereof

A sodium-ion battery and cathode material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as low voltage and lower battery energy density, and achieve the effects of simple operation, low cost, and excellent electrical performance

Active Publication Date: 2018-05-18
湖南钠邦新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its voltage is generally low, which reduces the energy density of the battery

Method used

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  • Positive electrode material for sodium-ion battery and preparation method thereof
  • Positive electrode material for sodium-ion battery and preparation method thereof
  • Positive electrode material for sodium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take 0.01mol of sodium pyrophosphate, 0.02mol of ferrous oxalate, 0.01mol of manganese acetate and 0.02mol of ammonium dihydrogen phosphate in 80ml of deionized water, stir and dissolve, add 0.05mol of tetraethylene glycol, heat and stir in a water bath at 80°C until a colloid is formed, and then Dry the precursor powder in an oven at 120°C; calcinate the precursor at 550°C for 10h under an inert atmosphere to obtain the product Na 4 Fe 2 Mn(PO 4 ) 2 (P 2 o 7 ).

[0049] The produced Na 4 Fe 2 Mn(PO 4 ) 2 (P 2 o 7 ) Morphology (SEM) of the material see figure 1 , is a three-dimensional sheet-like porous material. The sodium ion battery composite positive electrode material prepared in this embodiment and the sodium sheet are assembled into a button battery, from image 3 It can be seen that the rate performance of the material is superior, even at a rate of 2C, it still has a capacity of 82mAh / g. From Figure 4 It can be seen from the rate cycle diagram t...

Embodiment 2

[0051] Take 0.01 mol of sodium pyrophosphate, 0.02 mol of ferrous oxalate, 0.01 mol of manganese acetate and 0.02 mol of ammonium dihydrogen phosphate in 80 ml of deionized water, stir and dissolve, add 0.08 mol of tetraethylene glycol, heat and stir in a water bath at 80°C until a colloid is formed, and then Dry the precursor powder in an oven at 120°C; calcinate the precursor at 550°C for 10h under an inert atmosphere to obtain the product Na 4 Fe 2 Mn(PO 4 ) 2 (P 2 o 7 ). The composite positive electrode material of the sodium ion battery prepared in this example and the sodium sheet were assembled into a button battery, and the specific capacity was 73.2mAh / g at a rate of 2C. The capacity retention rate was 88%.

Embodiment 3

[0053] Take 0.01mol of sodium pyrophosphate, 0.02mol of ferrous oxalate, 0.01mol of manganese acetate and 0.02mol of ammonium dihydrogen phosphate in 40ml of deionized water, stir and dissolve, add 0.05mol of tetraethylene glycol, heat and stir in a water bath at 80°C until a colloid is formed, and then Dry the precursor powder in an oven at 120°C; calcinate the precursor at 550°C for 10h under an inert atmosphere to obtain the product Na 4 Fe 2 Mn(PO 4 ) 2 (P 2 o 7 ). The composite positive electrode material of the sodium ion battery prepared in this example and the sodium sheet were assembled into a button battery, and the specific capacity was 72.8mAh / g at a rate of 2C. The capacity retention rate was 88%.

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Abstract

The invention specifically discloses a phosphate-pyrophosphate composite polyanionic iron-based positive electrode material with a chemical formula of Na4Fe2M(PO4)2(P2O7), belonging to the field of positive electrode materials for sodium-ion batteries. In the chemical formula, M is at least one selected from a group consisting of Mn, Co and Ni. In addition, the invention also discloses a preparation method and application of the positive electrode material. The positive electrode material provided by the invention has good electrical properties. Study results show that the positive electrode material has a high voltage platform of 3.5 v or more and excellent thermal stability, rate performance and cycle performance. The preparation method of the invention is simple in process, high in repeatability and low in cost and has great commercial application prospects.

Description

technical field [0001] The invention relates to the field of sodium ion battery materials, in particular to a phosphate pyrophosphate composite polyanion type iron-based positive electrode material. Background technique [0002] Due to its high specific capacity and high energy density, lithium-ion batteries are widely used in portable electronic devices and the promotion and application of ion batteries in the field of large-scale energy storage systems. Sodium-ion batteries are regarded as an effective substitute for lithium-ion batteries and have become a research hotspot at home and abroad. Sodium has similar physical and chemical properties to lithium, and the reserves of sodium resources in the crust are considerable (the crustal abundance of lithium is 0.006%, and the crustal abundance of sodium is 2.64%), so it has a great advantage in cost. This also makes sodium-ion batteries one of the most promising battery systems for large-scale energy storage commercial appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01B25/42H01M4/58H01M10/054
CPCC01B25/42C01B25/45H01M4/5825H01M10/054H01M2004/028Y02E60/10
Inventor 张治安赖延清李煌旭肖志伟张凯李劼
Owner 湖南钠邦新能源有限公司
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