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PVP-induced VS4 microstructure regulated magnesium ion battery positive electrode material PVP-VS4 and application

A PVP-VS4, magnesium ion battery technology, applied in battery electrodes, positive electrodes, structural parts, etc., can solve the problems of low specific capacity, poor cycle stability of magnesium ion batteries, slow diffusion kinetics, etc., to improve electrical conductivity, Excellent electrochemical performance, the effect of reducing polarization

Active Publication Date: 2022-01-14
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although magnesium-ion batteries have many advantages, there are still some problems, such as: poor cycle stability of magnesium-ion batteries, low specific capacity, slow diffusion kinetics, etc. (see literature: Cation-deficient TiO2( B) nanowires with protonscharge compensation for regulating reversible magnesium storage, Luo et al. Nano Energy, 2020, 72, 104716)

Method used

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  • PVP-induced VS4 microstructure regulated magnesium ion battery positive electrode material PVP-VS4 and application
  • PVP-induced VS4 microstructure regulated magnesium ion battery positive electrode material PVP-VS4 and application
  • PVP-induced VS4 microstructure regulated magnesium ion battery positive electrode material PVP-VS4 and application

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Embodiment

[0029] Weigh 0.58g of ammonium metavanadate and 0.0058g of polyvinylpyrrolidone and dissolve them in 30ml of deionized water, stir magnetically at a constant temperature at 60°C until completely dissolved to obtain solution A; at the same time, weigh excess thioacetamide and dissolve in In 30ml of ethylene glycol, magnetically stir at room temperature until completely dissolved to obtain solution B; under constant temperature magnetic stirring at 60°C, fully mix solution A and solution B. Then, the mixed solution was transferred to a 100ml reaction kettle, and after reacting for 4 hours at 200°C, it was cooled to room temperature with the furnace; the precipitate was washed with deionized water and absolute ethanol for 3 times, and placed in a vacuum drying oven. Dry at 60°C for 12 hours to obtain the positive electrode material PVP-VS for magnesium ion batteries 4 .

[0030] After hydrothermal reaction, PVP was intercalated into VS 4 Interchain, and expanded PVP-VS 4 chain...

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Abstract

The invention discloses a PVP-induced VS4 microstructure regulated magnesium ion battery positive electrode material PVP-VS4 and application, which belong to the technical field of battery materials. The preparation method comprises the following steps of firstly, preparing an aqueous solution with the concentration of 0.167 M from ammonium metavanadate and polyvinylpyrrolidone according to the ratio of 1: 100, then mixing the aqueous solution with an ethylene glycol solution of excessive thioacetamide, and carrying out hydrothermal treatment for 4 hours at the temperature of 200 DEG C in a reaction kettle, and then respectively washing with deionized water and ethanol for three times, and drying to obtain the magnesium ion battery positive electrode material PVP-VS4. PVP is embedded between VS4 chains through a one-step hydrothermal method, PVP-VS4 chain spacing expansion, V<3+> self-doping, sulfur-rich vacancy formation and high-index crystal face exposure are induced, co-embedding of Mg <2+> and MgCl<+> ions is realized, more active sites are exposed, the ion diffusion speed is increased, the reaction kinetics and structural stability are enhanced, and further, the electrochemical performance of the magnesium ion battery is improved. The magnesium ion battery assembled by the composite material has high specific capacity, excellent cycling stability and rate performance, and has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a PVP-induced VS 4 PVP-VS cathode material for magnesium ion battery with microstructure regulation 4 and applications. Background technique [0002] The development of low-cost renewable energy storage technology is undoubtedly an effective way to solve the energy and environmental crisis faced by today's society. Magnesium-ion batteries have a high volume specific capacity (3833mAh cm -3 ), low cost, high safety, and low environmental impact have attracted widespread attention (see literature: Cu 2 MoS 4 hollow nanocages with fast and stable Mg 2+ -storage performance, Zhang et al. Chem. Eng. J., 2020, 387, 124125). Although magnesium-ion batteries have many advantages, there are still some problems, such as: poor cycle stability of magnesium-ion batteries, low specific capacity, slow diffusion kinetics, etc. (see literature: Cation-deficient TiO 2 (B) nanowir...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/36H01M4/58H01M10/054
CPCH01M4/604H01M4/362H01M4/5815H01M10/054H01M2004/028Y02E60/10
Inventor 丁诗琦李镇江孟阿兰戴鑫
Owner QINGDAO UNIV OF SCI & TECH
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