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Rechargeable magnesium battery cathode material and preparation method thereof

A cathode material, magnesium battery technology, applied in secondary batteries, battery electrodes, positive electrodes, etc., can solve the problems of complicated preparation process, low battery efficiency, low theoretical capacity, etc., achieve broad application prospects, enhance conductivity, Excellent performance

Active Publication Date: 2017-09-15
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its preparation process is cumbersome and complicated, and the experimental conditions required are relatively harsh.
Moreover, the Chevrel phase compound Mo 6 S 8 The theoretical capacity is relatively low, which limits its application in high energy density secondary magnesium batteries
Wang Chunsheng et al. (Tian H, Gao T, Li X, et al. High powerrechargeable magnesium / iodine battery chemistry [J]. Nature Communications, 2017, 8: 14083.) The iodine cathode magnesium battery has high initial capacity, high voltage platform, The cycle performance is good, but because iodine and magnesium iodide dissolve in the electrolyte, the shuttle effect is serious, resulting in low battery efficiency

Method used

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  • Rechargeable magnesium battery cathode material and preparation method thereof
  • Rechargeable magnesium battery cathode material and preparation method thereof
  • Rechargeable magnesium battery cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Use the elemental powder of titanium, aluminum and carbon as raw materials, mix according to the ratio of Ti:Al:C=3:1.1:1.9, add grinding balls at a ball-to-material ratio of 10:1, and operate at 300r / min under argon atmosphere After ball milling for 12 hours, the powder was taken out and sintered by SPS (Spark Plasma Sintering) at a pressure of 50 MPa and a heating rate of 100 °C / min to 1350 °C, kept for 10 min, and argon assisted cooling to room temperature. The XRD pattern of the obtained product is as follows figure 1 Shown, indicating that the obtained product is Ti 3 AlC 2 . Ti 3 AlC 2 The surface is polished clean, ground into powder, and the powder below 200 mesh is sieved, soaked in 40% hydrofluoric acid at 40°C for 12 hours, washed with deionized water until neutral, centrifuged, and dried to obtain Ti 3 C 2 T x (T is -F, -OH or -O-); take 0.5g Ti 3 C 2 T x Added to 20mL of 1% glucose solution, ultrasonically oscillated for 30min, transferred to a hyd...

Embodiment 2

[0032] Use the elemental powder of titanium, aluminum and carbon as raw materials, mix according to the ratio of Ti:Al:C=3:1.1:1.9, add grinding balls at a ball-to-material ratio of 10:1, and operate at 300r / min under argon atmosphere After ball milling for 12 hours, the powder was taken out and sintered by SPS (Spark Plasma Sintering) at a pressure of 50 MPa and a heating rate of 100 °C / min to 1350 °C, kept for 10 min, and cooled to room temperature with argon gas assistance. The obtained product Ti 3 AlC 2 ; 3 AlC 2 The surface is polished clean, ground into powder, and the powder below 200 mesh is sieved, soaked in 40% hydrofluoric acid at 40°C for 12 hours, washed with deionized water until neutral, centrifuged, and dried to obtain Ti 3 C 2 T x (T is -F, -OH or -O-); take 0.2g Ti 3 C 2 T x Add it into 50mL of 0.5% glucose solution, ultrasonically oscillate for 30min, transfer to a hydrothermal reactor, react at 220°C for 12h, cool to room temperature, wash and dry t...

Embodiment 3

[0035] Use the elemental powder of titanium, aluminum and carbon as the raw material, mix it according to the ratio of Ti:Al:C=3:1.1:1.9, put it into the grinding ball with the ratio of ball to material 10:1, 300r / min under argon atmosphere After ball milling for 12 hours, the powder was taken out and sintered by SPS (Spark Plasma Sintering) at a pressure of 50 MPa and a heating rate of 100°C / min to 1350°C, held for 10 minutes, and argon assisted cooling to room temperature. The resulting product was Ti 3 AlC 2 ; 3 AlC 2 The surface is polished clean, ground into powder, and the powder below 200 mesh is sieved, soaked in 40% hydrofluoric acid at 40°C for 12 hours, washed with deionized water until neutral, centrifuged, and dried to obtain Ti 3 C 2 T x (T is -F, -OH or -O-); take 2g Ti 3 C 2 T x Add it into 50mL of 2% glucose (or sucrose) solution, ultrasonically shake for 30min, then transfer to a hydrothermal reaction kettle, react at 220°C for 12h, cool to room temper...

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Abstract

The invention relates to a rechargeable magnesium battery cathode material. The percentages by weight of the chemical components of the rechargeable magnesium battery cathode material are: 80 to 90 percent of titanium dioxide, 5 to 10 percent of activated carbon and 5 to 10 percent of carbon nanotubes. A preparation method for the rechargeable magnesium battery cathode material mainly includes the following steps: the powder of three types of elements, i.e. titanium, aluminium and carbon, is sintered by spark plasma, so that Ti3AlC2 is synthesized; Ti3C2Tx is obtained by hydrofluoric acid erosion; Ti3C2Tx is put into glucose or sucrose solution, and activated carbon-coated Ti3C2Tx is obtained by hydrothermal carbonization; aqueous hydrogen peroxide solution is added into activated carbon-coated Ti3C2Tx, and after oxidation in a hydrothermal reaction kettle, activated carbon-coated two-dimensional layered titanium dioxide is obtained; the activated carbon-coated two-dimensional layered titanium dioxide is mixed with the carbon nanotubes, an appropriated amount of deionized water is added, and after stirring and ultrasonic oscillation, the rechargeable magnesium battery cathode material is obtained. The rechargeable magnesium battery cathode material obtained by the invention is nontoxic, harmless, safe and environment-friendly, the structure is novel, and both the cycle performance and rate capability of the magnesium battery are greatly enhanced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a secondary magnesium battery positive electrode material and a preparation method thereof. Background technique [0002] Due to its high voltage, good rate performance, and stable cycle, lithium-ion batteries have been widely used in portable electronic devices, electric and hybrid vehicles, but in large-capacity storage, lithium is prone to form dendrites during the deposition process , safety issues cannot be ignored. [0003] Compared with lithium batteries, the deposition of magnesium on the electrode does not form dendrites, which has high safety; and magnesium is abundant in the earth's crust and low in price. Magnesium batteries have received more and more attention. Compared with lithium ions, magnesium ions are more polar and difficult to intercalate into electrodes. Therefore, it is very important to study a suitable cathode material for magnesium batteries. At pre...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/62H01M10/054
CPCH01M4/366H01M4/48H01M4/485H01M4/625H01M10/054H01M2004/028Y02E60/10
Inventor 彭秋明窦洋彭程葛炳成
Owner YANSHAN UNIV
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