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A kind of positive electrode material of sodium-rich phase sodium-ion battery and its preparation and application

A sodium-ion battery and positive electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult capacity, low conductivity, and poor rate performance, and achieve high capacity, improved conductivity, and high Effect of Magnification Performance

Active Publication Date: 2021-01-29
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

Na 3 MnTi(PO 4 ) 3 The conductivity is low, the capacity is difficult to develop, and the rate performance is extremely poor

Method used

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  • A kind of positive electrode material of sodium-rich phase sodium-ion battery and its preparation and application
  • A kind of positive electrode material of sodium-rich phase sodium-ion battery and its preparation and application
  • A kind of positive electrode material of sodium-rich phase sodium-ion battery and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] First, take 36mmol sodium acetate, 10mmol manganese acetate, 8.5mmol titanium dioxide, 30mmol ammonium dihydrogen phosphate, add appropriate amount of absolute ethanol, ball mill at 450rpm with ordinary planetary ball mill for 12h, and calcinate at 650°C for 10h under argon atmosphere to obtain the precursor. The precursor and 10wt% (based on the total mass of the mixed material) CNTs were milled by 10000HZ high-energy vibration ball for 1 hour, and then the mixed material was placed in an argon atmosphere tube furnace and sintered at 650°C for 10 hours. The obtained solid product was for Na 3.6 MnTi 0.85 (PO 4 ) 3 / CNT composite cathode material. The produced Na 3.6 MnTi 0.85 (PO 4 ) 3 / CNT cathode material X-ray diffraction pattern (XRD) see figure 1 . Depend on figure 2 It can be seen that the obtained Na 3.6 MnTi 0.85 (PO 4 ) 3 The particles are irregular, and there are carbon nanotubes in the outer layer of the particles.

[0063] The positive elect...

Embodiment 2

[0065] First, take 42mmol sodium acetate, 10mmol manganese acetate, 0.7mmol titanium dioxide, 30mmol ammonium dihydrogen phosphate, add appropriate amount of absolute ethanol, ball mill at 450rpm with ordinary planetary ball mill for 12h, and calcinate at 650°C for 10h under argon atmosphere to obtain the precursor. The precursor and 10wt% (based on the total mass of the mixed material) CNTs were milled by 10000HZ high-energy vibration ball for 1 hour, and then the mixed material was placed in an argon atmosphere tube furnace and sintered at 650°C for 10 hours. The obtained solid product was for Na 4.2 MnTi 0.7 (PO 4 ) 3 / CNT composite cathode material. The positive electrode material of the sodium ion battery prepared in this example and the sodium sheet are assembled into a button battery, and the discharge specific capacity reaches 82mAh / g after 200 cycles at 0.2C, and the capacity retention rate reaches 91%, indicating that further reduction of titanium content will aff...

Embodiment 3

[0067]First, take 32mmol of sodium acetate, 10mmol of manganese acetate, 0.95mmol of titanium dioxide, and 30mmol of ammonium dihydrogen phosphate, add an appropriate amount of absolute ethanol, ball mill with a common planetary ball mill at 450rpm for 12h, and calcinate at 650°C for 10h under an argon atmosphere to obtain a precursor. The precursor and 10wt% (based on the total mass of the mixed material) CNTs were milled by 10000HZ high-energy vibration ball for 1 hour, and then the mixed material was placed in an argon atmosphere tube furnace and sintered at 650°C for 10 hours. The obtained solid product was for Na 3.2 MnTi 0.95 (PO 4 ) 3 / CNT composite cathode material. The positive electrode material of the sodium ion battery prepared in this example and the sodium sheet were assembled into a button battery, and the discharge specific capacity reached 93mAh / g after 200 cycles at 0.2C, and the capacity retention rate reached 94%.

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Abstract

The invention belongs to the technical field of sodium-ion battery materials, and specifically discloses a sodium-rich phase sodium-ion battery cathode composite material, which is a composite material of sodium-rich phase sodium titanomanganese phosphate and carbon, and the chemical formula of the sodium-rich phase sodium titanomanganese phosphate is Na 3+4x MnTi 1‑x (PO 4 ) 3 , where 0<x≤0.3. The invention also discloses the preparation of the composite material and its application in sodium ion batteries. The composite material of the present invention innovatively adopts the sodium-rich titanium manganese phosphate sodium, which increases the sodium content in the material through the appropriate proportion of titanium defects. The excess sodium content in the lattice is conducive to maintaining the stability of the structure during the extraction of sodium ions, thereby improving the long-term cycle stability of the material. In addition, the synergy between the sodium-rich phase sodium titanomanganese phosphate and carbon can significantly improve the electrical properties of the composite material, such as improving the capacity and cycle performance of the composite material. In addition, the "Na‑Mn‑Ti‑P‑O" system is rich in resources and low in cost, and the preparation method is simple to operate and has broad prospects for commercial application.

Description

technical field [0001] The invention relates to a sodium-ion battery positive electrode material, in particular to a sodium-rich phase positive electrode material with a sodium fast ion conductor structure, and the application of the material as a sodium-ion battery, belonging to the field of sodium-ion batteries. Background technique [0002] Due to the advantages of high energy density, high stability, and long life, lithium-ion batteries have rapidly occupied the market of portable electronic products (notebook computers, smart mobile devices, tablet computers, etc.), and continue to penetrate into the field of electric vehicles. However, the reserves of lithium resources in the earth's crust are low and the geographical distribution is uneven, which makes lithium prices continue to rise during the process of large-scale promotion and application of lithium-ion batteries, resulting in high prices for lithium-ion batteries. Therefore, the application of lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 张治安赖延清李煌旭李天伟张凯李劼
Owner 湖南钠邦新能源有限公司
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