Composite cathode material used for lithium-sulfur battery and having high-rate performance and preparation method

A composite cathode material, lithium-sulfur battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as not being well solved, and achieve reduced loss of active materials, excellent rate performance, and improved rate performance. The effect of cycle performance

Inactive Publication Date: 2015-04-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, maintaining high initial capacity and improving cycle performance at high discharge rates are still not well resolved

Method used

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  • Composite cathode material used for lithium-sulfur battery and having high-rate performance and preparation method
  • Composite cathode material used for lithium-sulfur battery and having high-rate performance and preparation method
  • Composite cathode material used for lithium-sulfur battery and having high-rate performance and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Mesoporous carbon material / sulfur composite cathode material, the preparation method of which is as follows:

[0041] 1) Take porous multi-walled carbon nanotubes (h-CNT) as the conductive carbon material (C), weigh 0.2g; weigh 0.2g of the electrochemically active substance sulfur (S);

[0042] 2) Preparation by melting method: pour the sulfur weighed in step 1) into the weighed porous multi-walled carbon nanotube (h-CNT), the setting conditions of the melting method are: 2 Under the atmosphere of protective gas, the air flow rate is set to 50mL / min, under the condition of ventilation, stand still for 30min, discharge the air in the tube furnace, then rise to 155℃ after 100℃, keep it for 10h, and then cool naturally to prepare porous multi-layer furnace. Walled carbon nanotube / sulfur composite cathode material (h-CNT / S).

[0043] The methods of preparing the positive electrode sheet, assembling the battery and testing the battery are the same as those in the comparativ...

Embodiment 2

[0045] A composite positive electrode material for a lithium-sulfur battery with high rate performance, consisting of a conductive agent, an electrochemically active substance sulfur, and a modifier ZrO 2 Composition, the conductive agent is a porous multi-walled carbon nanotube (h-CNT), the electrochemically active substance sulfur is dispersed in the pores of the porous multi-walled carbon nanotube, and the modifier is connected with the mesoporous carbon material by chemical bonding . Wherein, the amount of each composition is calculated by mass percentage: 50 wt% of the conductive agent, 49.95 wt% of the electrochemical active material, and 0.05 wt% of the modifier.

[0046] The preparation method of the composite positive electrode material of the above-mentioned high-rate performance lithium-sulfur battery, the specific steps are as follows:

[0047] 1) Take porous multi-walled carbon nanotube (h-CNT) as conductive carbon material, weigh 0.2g; electrochemically active s...

Embodiment 3

[0054] A composite positive electrode material for a lithium-sulfur battery with high rate performance, consisting of a conductive agent, an electrochemically active substance sulfur, and a modifier ZrO 2 Composition, the conductive agent is a porous multi-walled carbon nanotube (h-CNT), the electrochemically active substance sulfur is dispersed in the pores of the porous multi-walled carbon nanotube, and the modifier is connected with the mesoporous carbon material by chemical bonding . Wherein, the dosage of each composition is calculated by mass percentage: conductive agent 51wt%, electrochemical active substance 48.88wt%, modifier 0.12wt%.

[0055] In this example, the preparation of the composite positive electrode material, the preparation of the positive electrode sheet, the method of assembling the battery and the battery test are all the same as in Example 2. The battery charge and discharge test results show that: at a rate of 0.5C, the first charge of the battery pr...

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Abstract

A composite cathode material used for a lithium-sulfur battery and having high-rate performance comprises a conductive agent, electrochemical active substances and a modifier, wherein the conductive agent adopts a mesoporous carbon material, the electrochemical active substances are dispersed in holes of the mesoporous carbon material, and the modifier is introduced in a chemical bonding manner to adjust the property of the holes, so that lithium ions freely pass to inhibit passing of polysulfide ions. According to the composite cathode material, by means of the characteristic of selective passing of ions, efficient immigration and moving out of the lithium ions in the cathode material can be guaranteed, meanwhile, lithium polysulfide is effectively inhibited from overflowing from the holes of the mesoporous carbon material in a charge-discharge process, and dissolution of lithium polysulfide in an electrolyte is inhibited. Therefore, the composite cathode material can have excellent high-rate performance and can effectively reduce influence of active substance loss as well as lithium cathode corrosion, fast capacity fading and the like caused by a shuttling effect because of lithium polysulfide dissolution, and the cycle performance of the lithium-sulfur battery is remarkably improved.

Description

technical field [0001] The invention relates to a composite positive electrode material and a preparation method of a lithium-sulfur battery with high rate performance. Background technique [0002] Currently, with Li 2 COO 2 、LiFePO 4 Lithium-ion secondary batteries such as cathode materials have been widely used. However, limited by the theoretical specific energy of these positive electrode materials, the existing lithium-ion battery system is difficult to meet the needs of lightweight, miniaturized, low-cost and non-toxic power supplies in the fields of portable electronic devices and mobile transportation in the future. The research and development of lithium secondary batteries with high energy density has attracted more and more attention, especially the lithium sulfur secondary battery system with elemental sulfur as the positive electrode and metallic lithium as the negative electrode. The research and development of this system has become a near A research hots...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/13H01M4/139H01M4/362H01M4/38H01M4/62Y02E60/10
Inventor 周成冈周吟吴金平韩波
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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