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A kind of preparation method of positive electrode material of lithium-sulfur battery

A production method and technology of positive electrode materials, which are applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems that the amount and dispersion affect the electrochemical performance of lithium-sulfur batteries, reduce the conductivity of the main body of sulfur, and achieve improved sulfur loading on electrodes The effect of improving the amount, improving electrochemical performance, and good adsorption performance

Active Publication Date: 2021-04-09
NINGBO UNIV
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Problems solved by technology

However, metal oxides usually reduce the conductivity of sulfur hosts, and the amount and dispersion of metal oxides will also affect the electrochemical performance of lithium-sulfur batteries. Therefore, the preparation method of this carbon-sulfur composite cathode needs to be further improved

Method used

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Embodiment Construction

[0027] Below in conjunction with embodiment the present invention is described in further detail.

[0028] The manufacturing method of the lithium-sulfur battery positive electrode material of the present embodiment comprises the following steps,

[0029] 1. Make GDC powder, synthesize gadolinium oxide and cerium salt into GDC precursor, and heat the prepared GDC precursor at a temperature of 300-500°C to obtain GDC powder;

[0030] 2. To make a nickel-containing solution, dissolve the nickel salt in water and stir until completely dissolved;

[0031] 3. Make a nickel-containing carbon solution, dissolve the soluble sugar in water, stir until completely dissolved, then mix the prepared sugar-containing solution with the nickel-containing solution in step 2, and stir evenly, or dissolve the soluble sugar in In the nickel-containing solution that step 2 makes, stir until soluble sugar dissolves completely;

[0032] 4. Add the GDC powder prepared in step 1 to the nickel-carbon ...

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Abstract

A method for making a positive electrode material for a lithium-sulfur battery, comprising the following steps: making GDC powder; making a nickel-containing carbon solution; adding the GDC powder to the nickel-containing carbon solution and heating and stirring until the solution becomes a paste; drying the paste solution to obtain Powder; heat the powder to 700-900°C for 1-5 hours in an inert gas atmosphere to obtain a black powder; heat the black powder to 600-850°C in an inert gas and hydrogen mixed gas atmosphere, and keep it for 1 ~ 3 hours to get a black powder containing Ni, GDC and porous carbon; react the black powder with sulfur powder to make a finished product; heat the finished product to remove excess sulfur attached to the carbon surface. The advantages of the present invention are: GDC can suppress the shuttle effect of polysulfides, improve the catalytic performance of lithium-sulfur battery positive electrode materials for redox, Ni and GDC can be combined to have higher electronic conductance and ion vacancies, and improve the performance of lithium-sulfur battery positive electrodes. The electrical conductivity of the material.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium batteries, in particular to a method for manufacturing positive electrode materials for lithium-sulfur batteries. Background technique [0002] With the rapid development of new energy technologies, the limit energy density of lithium-ion batteries has been difficult to meet the needs of future large-capacity energy storage technology, and lithium-sulfur batteries are due to their high theoretical specific capacity, high energy density, low price of elemental sulfur and environmental protection. It is considered to be the most promising energy storage device because of its friendliness and other characteristics. However, the commercialization of lithium-sulfur batteries is limited by some disadvantages of this battery, such as the poor electrical conductivity of sulfur, the "shuttle effect" of polysulfide intermediates, low sulfur loading, large volume expansion, and complex internal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052
CPCH01M4/38H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 郑道光王琴
Owner NINGBO UNIV
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