Double-ion battery based on molybdenum selenide-graphite and preparation method thereof

A molybdenum selenide, double ion technology, applied in chemical instruments and methods, graphite, secondary batteries, etc., can solve the problems of easy shedding, large volume change, poor conductivity, etc., and achieve high reversible capacity, good cycle stability, low cost effect

Active Publication Date: 2019-12-31
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problems referred to above, the object of the present invention is to provide a kind of preparation method based on molybdenum selenide-graphite dual-ion battery, utilize MoSe 2 The characteristics of high lithium storage capacity, while modifying its shortcomings of large volume change, easy to fall off, and poor conductivity, and using it in the negative electrode of dual-ion batteries to obtain high working voltage, high reversible capacity, and high rate Good performance dual-ion battery

Method used

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  • Double-ion battery based on molybdenum selenide-graphite and preparation method thereof
  • Double-ion battery based on molybdenum selenide-graphite and preparation method thereof
  • Double-ion battery based on molybdenum selenide-graphite and preparation method thereof

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Embodiment 1

[0023] A preparation method based on molybdenum selenide-graphite double-ion battery, comprising the following steps:

[0024] (1) Preparation of molybdenum selenide / nitrogen-doped carbon composite: Dissolve 100mg of phosphomolybdic acid, 400mg of citric acid and 4g of urea in 20mL of a mixed solvent of water and ethanol with a volume ratio of 1:1, and then at 75°C Stir for 3 hours, then place the product obtained in an oven at 100°C for 12 hours. After the solvent is evaporated to dryness, take out the product and place it in a tube furnace, and place selenium powder of the same quality on the upstream of the gas path. 2 / Ar volume ratio of 5 / 95 in a mixed atmosphere, calcined at 650 ° C for 6 hours, after the tube furnace is naturally cooled, MoSe can be obtained 2 / NC complex;

[0025] (2) Preparation of positive and negative electrodes: Disperse the positive electrode active material in water according to the mass ratio of graphite / sodium alginate / acetylene black of 8 / 1 / 1...

Embodiment 2

[0036] A preparation method based on molybdenum selenide-graphite double-ion battery, comprising the following steps:

[0037] (1) Preparation of molybdenum selenide / nitrogen-doped carbon composite: Dissolve 50mg of phosphomolybdic acid, 200mg of citric acid and 2g of urea in 20mL of a mixed solvent of water and ethanol with a volume ratio of 1:1, and then at 75°C Stir for 3 hours, then place the product in an oven at 100°C for 12 hours. After the solvent is evaporated to dryness, take out the product and place it in a tube furnace, and place selenium powder of the same quality on the upstream of the gas path. 2 / Ar volume ratio of 5 / 95 in a mixed atmosphere, calcined at 650 ° C for 6 hours, after the tube furnace is naturally cooled, MoSe can be obtained 2 / NC complex;

[0038] (2) Preparation of positive and negative electrodes: disperse the positive electrode active material in water according to the mass ratio of graphite / sodium alginate / acetylene black of 8 / 1 / 1, mix and ...

Embodiment 3

[0045] A preparation method based on molybdenum selenide-graphite double-ion battery, comprising the following steps:

[0046] (1) Preparation of molybdenum selenide / nitrogen-doped carbon composite: Dissolve 20mg of phosphomolybdic acid, 100mg of citric acid and 1g of urea in 20mL of a mixed solvent of water and ethanol with a volume ratio of 1:1, and then at 75°C Stir for 3 hours, then place the product in an oven at 100°C for 12 hours. After the solvent is evaporated to dryness, take out the product and place it in a tube furnace, and place selenium powder of the same quality on the upstream of the gas path. 2 / Ar volume ratio of 5 / 95 in a mixed atmosphere, calcined at 650 ° C for 6 hours, after the tube furnace is naturally cooled, MoSe can be obtained 2 / NC complex;

[0047] (2) Preparation of positive and negative electrodes: disperse the positive electrode active material in water according to the mass ratio of graphite / sodium alginate / acetylene black of 8 / 1 / 1, mix and ...

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Abstract

The invention discloses a double-ion battery based on molybdenum selenide-graphite and a preparation method of the double-ion battery. The gel containing phosphomolybdic acid is obtained through a simple sol-gel method. The preparation method comprises steps of calcining to synthesize the molybdenum selenide/nitrogen-doped carbon (MoSe2/NC) compound, and designing the molybdenum selenide-graphite-based dual-ion battery by taking the MoSe2/NC compound as a negative electrode material of the dual-ion battery and taking graphite as a positive electrode material. The method is advantaged in that the battery designed by the method is low in cost, the working voltage range of the assembled dual-ion battery is as high as 2-5V, and the assembled dual-ion battery is good in cycling stability, relatively high in reversible capacity and good in high-rate performance, the capacity is 86 mA h/g after 100 times of circulation under 2C multiplying power, and the 76 mA h/g reversible capacity can still be provided after circulation under 20 C super-large multiplying power.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a molybdenum selenide-graphite-based dual-ion battery and a preparation method thereof. Background technique [0002] Dual-ion batteries are a battery system that is different from traditional lithium-ion batteries. Traditional lithium-ion batteries only have Li + Moving between the positive and negative electrodes, while the double ions are in the process of charging and discharging, the anions and cations in the electrolyte will be intercalated and extracted in the positive and negative electrodes respectively. Due to the high potential of anion intercalation and extraction at the positive electrode, this new reaction mechanism can significantly increase the working voltage of the battery and increase the energy density of the battery. Molybdenum selenide (MoSe 2 ) is a typical two-dimensional material, which can undergo conversion reaction with lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/1397H01M4/36H01M4/58H01M4/583H01M10/054C01B32/20C01B32/205
CPCH01M4/1393H01M4/1397H01M4/362H01M4/583H01M4/58H01M10/054C01B32/20C01B32/205Y02E60/10
Inventor 魏明灯郑成刘真威
Owner FUZHOU UNIV
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