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Positive electrode material for sodium phase rich sodium-ion batteries and preparation method and application thereof

A technology for sodium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor rate performance, low conductivity, and difficult to exert capacity, and achieve high capacity exertion, improved conductivity, and high performance. Effect of magnification performance

Active Publication Date: 2018-11-16
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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  • Positive electrode material for sodium phase rich sodium-ion batteries and preparation method and application thereof
  • Positive electrode material for sodium phase rich sodium-ion batteries and preparation method and application thereof
  • Positive electrode material for sodium phase rich sodium-ion batteries and preparation method and application thereof

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 of 0.2C cycle, and the capacity retention rate reaches 91%, indicating that further reduction of titanium content wi...

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 positive electrode material for sodium phase rich sodium-ion batteries which is a composite material of sodium phase rich titanium-manganese-sodium phosphate and carbon; and the chemical formula of the sodium phase rich titanium-manganese-sodium phosphate is Na3+4xMnTi1-x(PO4)3, wherein x isgreater than 0 and smaller than or equal to 0.3. The invention also discloses preparation of the composite material and application thereof in the sodium-ion batteries. According to the composite material, the sodium phase rich titanium-manganese-sodium phosphate is creatively adopted, and the content of sodium in the material is improved through an appropriate proportion of titanium defect. Redundant sodium content in the character is beneficial for maintaining the stability of the structure in the process that sodium ions are taken out, and then the long cycling stability of the material ispromoted. Moreover, the sodium phase rich titanium-manganese-sodium phosphate is cooperative with carbon, so that the electrical properties, such as capacity and cycle performance, of the obtained composite material can be promoted obviously. Moreover, the system of Na-Mn-Ti-P-O is rich in resources and low in cost, and the preparation method is simple in operation and wide in commercial application prospects.

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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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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