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Element-doped oxide-sulfur composite material for positive electrode of lithium-sulfur battery and preparation method thereof

A technology of element doping and lithium-sulfur batteries, which is applied in the direction of electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problems that the cycle life of lithium-sulfur batteries cannot meet the requirements of industrialization, the electrode structure is damaged, and the elemental sulfur is not conductive, etc., to achieve It is conducive to mass industrial production, easy to control, and easy to obtain raw materials

Active Publication Date: 2017-01-04
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still several key problems in the commercialization of lithium-sulfur battery systems based on sulfur electrodes: (1) elemental sulfur is not conductive; (2) the dissolution of intermediate polysulfides; (3) electrolyte and polysulfides on the carrier Corrosion of carbon materials leads to electrode structure damage
However, insufficient attention to the third issue is one of the important factors that cause the cycle life of lithium-sulfur batteries to fail to meet the requirements of industrialization.

Method used

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  • Element-doped oxide-sulfur composite material for positive electrode of lithium-sulfur battery and preparation method thereof
  • Element-doped oxide-sulfur composite material for positive electrode of lithium-sulfur battery and preparation method thereof
  • Element-doped oxide-sulfur composite material for positive electrode of lithium-sulfur battery and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method and effect verification of the element-doped oxide-sulfur composite material for the positive electrode of lithium-sulfur batteries are as follows:

[0044] The first step: uniformly grind nitrogen-doped tin dioxide and elemental sulfur in a ball mill at a mass ratio of 1:1.5;

[0045] Step 2: In a nitrogen gas atmosphere, heat the nitrogen-doped tin dioxide sulfur mixture to 150°C at a heating rate of 1°C / min, and cool to room temperature after constant temperature for 10 hours to obtain a composite material;

[0046] The third step: fully grind the composite material, conductive agent graphite and binder polytetrafluoroethylene according to the mass ratio of 70:20:10 to form a slurry, and then coat the mixed slurry on the aluminum foil to make it Pole piece;

[0047] Step 4: Dry the pole pieces in a vacuum oven at 60°C for 12 hours, and then cut them into discs with a diameter of 1.6 cm for later use.

[0048] Take the cut-out pole piece as th...

Embodiment 2

[0050] The preparation method and effect verification of the element-doped oxide-sulfur composite material for the positive electrode of lithium-sulfur batteries are as follows:

[0051] Step 1: Grinding nitrogen-doped titanium dioxide and elemental sulfur in a ball mill evenly at a mass ratio of 1:1.5;

[0052] Step 2: In an argon gas atmosphere, heat the nitrogen-doped titanium dioxide sulfur mixture to 150°C at a heating rate of 3°C / min, keep the temperature for 10 hours and then cool to room temperature to obtain a composite material;

[0053]The third step: fully grind the composite material, conductive agent carbon black and adhesive polyethylene oxide according to the mass ratio of 60:20:20 to form a slurry, and then coat the mixed slurry on the aluminum foil to make it Pole piece;

[0054] Step 4: Dry the pole pieces in a vacuum oven at 110°C for 10 hours, and then cut them into discs with a diameter of 1.6 cm for later use.

[0055] All the other steps are the same ...

Embodiment 3

[0057] The preparation method and effect verification of the element-doped oxide-sulfur composite material for the positive electrode of lithium-sulfur batteries are as follows:

[0058] Step 1: Grind the obtained fluorine-doped tin dioxide and elemental sulfur in a ball mill evenly in a mass ratio of 1:1;

[0059] Step 2: In a nitrogen gas atmosphere, heat the fluorine-doped tin dioxide-sulfur mixture to 155°C at a heating rate of 5°C / min, keep the temperature for 24 hours and then cool to room temperature to obtain a composite material;

[0060] The third step: fully grind the composite material, conductive agent graphene and adhesive gelatin according to the mass ratio of 90:5:5 to form a slurry, and then apply the mixed slurry on the aluminum foil to make a pole piece ;

[0061] Step 4: Dry the pole pieces in a vacuum drying oven at 40°C for 12 hours, and then cut them into discs with a diameter of 1.6 cm for later use.

[0062] All the other steps are the same as in Exa...

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Abstract

The invention discloses an element-doped oxide-sulfur composite material for positive electrodes of lithium-sulfur batteries and a preparation method thereof. The element-doped oxide and elemental sulfur are mixed according to the mass ratio, mixed by ball milling, and then calcined in an inert atmosphere at 120°C-450°C, and kept for 1-48 hours, and the element-doped oxide for lithium-sulfur batteries is prepared. Sulfur composite cathode material. Compared with conventional porous carbon / sulfur composite materials, the composite cathode material for lithium-sulfur batteries prepared by the formulation and preparation method of the present invention shows better corrosion resistance and lower loss of electrochemically active surface area, effectively improving The utilization rate of the active material sulfur is improved, and the specific capacity and cycle life of the battery are improved. The preparation method is easy to operate, low in cost, suitable for large-scale production, and is a composite material for the cathode of lithium-sulfur batteries with a series of advantages such as high energy density, environmental friendliness and low price.

Description

technical field [0001] The invention relates to an element-doped oxide-sulfur composite material for positive electrodes of lithium-sulfur batteries and a preparation method thereof, belonging to the field of inorganic nanometer materials and chemical power sources. Background technique [0002] In recent years, with the steady growth of demand for chemical energy storage batteries in portable electronic devices, consumer electronic devices, electric vehicles and large power grids, secondary batteries have ushered in the best opportunity for development. However, the energy density and cycle life of existing lithium-ion batteries are still insufficient for many of the above applications, and electrode materials with higher capacities are urgently needed. Over the years, significant progress has been made in new high-performance anode materials such as silicon and tin for rechargeable batteries, but the major limiting factor remains the relatively low capacity of cathode mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M4/139
CPCH01M4/0404H01M4/139H01M4/362H01M4/624H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 赵生荣范瑞娟冯皓田占元邓增社
Owner SHAANXI COAL & CHEM TECH INST