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A kind of sodium ion battery electrode material ktiopo 4 Synthesis and application of

A sodium-ion battery and electrode material technology, which is applied in the manufacture of battery electrodes, secondary batteries, and electrolyte batteries, and can solve problems such as low Coulombic efficiency and low working voltage

Active Publication Date: 2021-04-09
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Titanium-based materials have been extensively studied due to the intercalation / extraction mechanism, such as Na 2 Ti 3 o 7 ,TiO 2 , Na 2 Ti 6 o 13 , NaTi 2 (PO 4 ) 3 , Li 4 Ti 5 o 12 , Na 0.66 [Li 0.22 Ti 0.78 ]O 2 etc., but most materials also limit their use due to problems such as low Coulombic efficiency and low operating voltage.

Method used

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  • A kind of sodium ion battery electrode material ktiopo <sub>4</sub> Synthesis and application of
  • A kind of sodium ion battery electrode material ktiopo <sub>4</sub> Synthesis and application of
  • A kind of sodium ion battery electrode material ktiopo <sub>4</sub> Synthesis and application of

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Embodiment 1

[0032] A KTiOPO 4 The preparation method of material, described comprises the following steps:

[0033] 1) Pre-mix 0.003mol potassium dihydrogen phosphate and 0.003mol titanium dioxide in a mortar, moisten with ethanol, and ball mill for 3 hours at 400rpm to obtain a homogeneous mixture, and dry the mixture in an oven at 80°C;

[0034] 2) Take out the precursor after cooling down, grind the precursor powder with a mortar, sinter in a muffle furnace to 800°C and keep it warm for 12 hours, then take it out after natural cooling, and get KTiOPO, a negative electrode material for a rechargeable sodium-ion battery 4 .

[0035] figure 1 For the KTiOPO prepared by the embodiment of the present invention 4 From the scanning electron microscope image of the powder material, it can be seen that the synthesized sample powder is a micron block formed by the accumulation of primary particles with a particle size between 300-500nm, and the particles are closely packed together.

[0036]...

Embodiment 2

[0039] A KTiOPO 4 The preparation method of the material is the same as in Example 1, the difference is that the sintering temperature is 850° C. and the holding time is 8 hours.

[0040] Figure 4 For the KTiOPO prepared by the embodiment of the present invention 4 From the scanning electron microscope image of the powder material, it can be seen that the synthesized sample powder is a micron block formed by the accumulation of primary particles with a particle size between 300-500nm, and the particles are relatively dispersed.

[0041] With embodiment 1, KTiOPO 4 , Super P and PVDF were ground according to the mass ratio of 6:3:1, mixed with NMP to form a slurry, evenly coated on the copper foil current collector, and the obtained electrode sheet was dried in a vacuum oven at 100°C for 12 hours at a constant temperature Dry, after natural cooling, cut the prepared electrode sheet into a disc with a diameter of 10mm as an electrode, use a pure sodium sheet as a counter ele...

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Abstract

A kind of negative electrode material KTiOPO of sodium ion battery 4 The synthesis and application of the invention belong to the field of new chemical power sources. The synthesis method is to premix phosphate and titanium oxide evenly, infiltrate with ethanol in a ball mill tank, then ball mill the mixture and dry to obtain a precursor; then sinter the precursor to obtain KTiOPO 4 . The method has the characteristics of low cost, simple synthesis method, and easy implementation. It is used as an anode material for a sodium ion battery, and the battery has high safety performance, good rate performance, and stable cycle performance. ‑1 ) The reversible capacity is 89mAh g ‑1 , cycled 1000 times, the specific capacity has almost no attenuation, and the formation of sodium dendrites can be avoided in the process of charging and discharging, which solves the problem that dendrites are easily generated at low potentials in existing sodium-ion battery negative electrode materials. The electrode material can be matched with high-voltage cathode materials to improve the performance of sodium-ion batteries.

Description

[0001] The present invention relates to a kind of electrode material of sodium ion battery, especially KTiOPO 4 The synthesis and application of the invention belong to the field of new chemical power sources. Background technique [0002] Due to the advantages of abundant sodium resources, low price, and similar physical and chemical properties to lithium ions, sodium ion batteries are considered to be one of the ideal choices for next-generation large-scale energy storage technologies. However, due to the radius of Na-ion batteries than lithium ion Large, the diffusion rate in the solid state is slow, so that the electrode materials with excellent performance in lithium-ion batteries cannot show good electrochemical performance in sodium-ion batteries. Therefore, seeking new electrode materials has become a major breakthrough in the practical application of sodium-ion batteries. Among the anode materials for rechargeable Na-ion batteries, hard carbon, tin-based, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/054H01M10/058
CPCH01M4/362H01M4/5825H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 陶占良刘双张雪静邵涟漪陈军李海霞梁静
Owner NANKAI UNIV