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A carbon-sulfur composite positive electrode for a secondary battery

A composite cathode and secondary aluminum battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor cycle performance, low sulfur load, low energy density, etc., and achieve improvement High-rate charge-discharge performance, improved reactivity, and high energy density

Inactive Publication Date: 2016-08-24
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low sulfur loading, small specific capacity, low energy density and poor cycle performance in the existing electrodes, and provide an electrode with simple preparation process, high specific capacity, high rate capability and good cycle performance. good composite cathode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of carbon nanotube arrays: Using stainless steel as the substrate, Fe as the catalyst, ethylene as the carbon source, hydrogen and nitrogen as the carrier gas, the carbon nanotube arrays were prepared by chemical vapor deposition (CVD).

[0045] (2) Composite sulfur: Put the prepared carbon nanotube array and elemental sulfur in a tube furnace at a mass ratio of 1:10, heat to 155°C, and keep it for 10 hours under nitrogen gas to form sulfur / carbon nano Tube Array Composite.

[0046] (3) Coated graphene: Prepare a graphene oxide aqueous solution with a concentration of 10mg / mL, ultrasonically disperse for 10h, then add reducing agent ammonia water to it, and react under ultrasonic conditions for 24h to obtain a graphene dispersion, which is vacuum filtered and washed with water , to prepare a graphene dispersion with a graphene content of 8wt%, and then place the prepared sulfur / carbon nanotube array composite in it, let it stand for 24h, make its surface...

Embodiment 2

[0050] Preparation of carbon nanotube arrays: based on conductive carbon fiber paper, Fe(NO 3 ) 3 As a catalyst, it is pre-coated on the surface of carbon paper, with methane as the carbon source and nitrogen as the protective gas, and the carbon nanotube array is prepared by chemical vapor deposition (CVD).

[0051] All the other preparation methods are the same as in Example 1. The measured open circuit voltage of the battery is 1.65V, the first discharge capacity is 839mAh, and after 50 charge and discharge cycles, the capacity retention rate is 82.4%.

Embodiment 3

[0053] The preparation of aligned carbon nanotubes is the same as in Example 2.

[0054] Composite sulfur: heat the elemental sulfur to a molten state, put the prepared carbon nanotube array into it under the protection of nitrogen, keep it for 5~10h, take it out and dry it in an oven to form a sulfur / carbon nanotube array composite material.

[0055] Coated graphene: prepare a graphene oxide aqueous solution with a concentration of 15 mg / mL, ultrasonically disperse it for 5 hours, then add reducing agent ammonia water to it, and react under ultrasonic conditions for 48 hours to obtain a graphene dispersion, which is vacuum filtered and washed with water to prepare The graphene content is the graphene dispersion liquid of 10wt%, and then the prepared sulfur / carbon nanotube array composite material is placed in it, let it stand for 48h, and its surface is coated with a few layers of graphene sheets, and the product is taken out at 40°C Dry in an oven for 10 hours to obtain a co...

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Abstract

The invention discloses a carbon sulfur compound anode for a secondary battery. The anode is formed by compounding a carbon nanotube array, sulfur and graphene, is provided with a three-dimensional network conductive framework and is good in electrochemical performance. A preparation method of the anode comprises the following steps: compounding elemental sulfur in the carbon nanotube array at first and then wrapping an outer layer with few graphene sheet layers. The preparation method is simple in process, low in cost and environment-friendly due to nonuse of toxic raw materials; moreover, the compound anode does not need to be added with a conductive agent and a bonder, and is high in energy density and sulfur utilization rate, and the rate performance and the cycle performance of the secondary aluminum battery are greatly improved.

Description

technical field [0001] The invention belongs to the field of battery material science, and relates to a composite positive electrode for a secondary aluminum battery, in particular to a sulfur / carbon nanotube array composite positive electrode coated with graphene on the surface and a preparation method thereof. Background technique [0002] As a new type of green chemical power source, rechargeable aluminum battery has the characteristics of high specific energy, safety, low price, and no pollution. It is expected to become a new generation of high-capacity power battery and energy storage system. The theoretical volume specific capacity of aluminum is 8050mAh / cm 3 , is 4 times that of lithium, and the chemical activity is stable, it is an ideal negative electrode material; the theoretical volume specific capacity of sulfur is 3467mAh / cm 3 , is one of the cathode materials with the highest energy density known. The secondary battery composed of aluminum and sulfur is an e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62B82Y30/00
CPCH01M4/13H01M4/139H01M4/366H01M4/625H01M10/05Y02E60/10
Inventor 赵宇光钟毓娟
Owner NANJING ZHONGCHU NEW ENERGY
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