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A kind of lithium-sulfur battery composite positive electrode material and its preparation method and application

A composite positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of poor conductivity of sulfur and discharge end products, low utilization of active materials, hindering industrial application, etc., to achieve inhibition Shuttle effect, ease of electrode volume change, effect of high load

Active Publication Date: 2022-05-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium-sulfur batteries still face problems such as poor conductivity of sulfur and discharge end products, dissolution and shuttling of soluble intermediate products (polysulfides), and volume expansion of charging and discharging electrodes, resulting in low utilization of active materials, rapid capacity decay, and electrode structure damage. , which seriously hinders its industrial application

Method used

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  • A kind of lithium-sulfur battery composite positive electrode material and its preparation method and application
  • A kind of lithium-sulfur battery composite positive electrode material and its preparation method and application
  • A kind of lithium-sulfur battery composite positive electrode material and its preparation method and application

Examples

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Embodiment 1

[0027] This embodiment provides a method for preparing a lithium-sulfur battery composite positive electrode material, comprising the following steps:

[0028] (1) Preparation of porous carbon fiber Ni / PCF with Ni nanoparticles embedded on the surface:

[0029] 1×1cm 2 Commercial carbon fibers were arranged in a mixed solution of concentrated nitric acid (68wt%) and concentrated sulfuric acid (98wt%) with a volume ratio of 1:3, refluxed at 80°C for 2h, then ultrasonically cleaned with acetone and absolute ethanol, and dried; configure 1M NaNO 3 and 1MNi(NO 3 ) 2 The mixed solution was used as the electrolyte, and Ni(OH) was deposited on the surface of carbon fiber (CF) by constant current electrodeposition. 2 , deposited at a current density of 6 mA cm -2 , the deposition time is 10min, and Ni(OH) 2 @CF Composite Materials; Finally Ni(OH) 2The @CF composite material was calcined at 800 °C for 5 h in an argon atmosphere to obtain porous carbon fiber Ni / PCF with Ni nanopar...

Embodiment 2

[0048] The preparation method of this example is the same as that of Example 1, except that the Ni / PCF prepared in step (1) is placed in 3M hydrochloric acid, pickled at 80°C for 6 hours to prepare PCF, and then the PCF is placed in hexahydrate The crystallization growth was carried out in the mixed solution of cobalt nitrate and 2-methylimidazole, and the conductive carrier Co / NC@PCF with no Ni particles on the surface of PCF but only Co / NC loaded on the surface of PCF was prepared, and other implementation conditions remained unchanged. Compared with Example 1, the capacity and cycle stability of the lithium-sulfur battery assembled with the positive electrode material prepared in this example are reduced, and the initial discharge capacity at 0.5C is 1073mAh g -1 , the discharge capacity after 300 cycles is 812mAh g -1 , the capacity retention rate is 75.7%; in addition, the rate performance is also reduced.

Embodiment 3

[0050] The preparation method of this embodiment is the same as that of Example 1, except that the calcination temperature in step (2) is 800° C., and other implementation conditions remain unchanged. Compared with Example 1, the capacity and cycle stability of the lithium-sulfur battery assembled with the positive electrode material prepared in this example remained basically unchanged, and the initial discharge capacity at 0.5C was 1092mAh g -1 , the discharge capacity after 300 cycles is 886mAhg -1 , the capacity retention rate was 81.1%; in addition, the rate performance remained basically unchanged.

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Abstract

The invention belongs to the technical field of new energy materials and devices, and relates to a lithium-sulfur battery composite positive electrode material and a preparation method and application thereof. The lithium-sulfur battery composite cathode material is composed of active sulfur and Co / NC@Ni / PCF sulfur carrier, where Co / NC is N-doped porous carbon embedded with Co nanoparticles formed by calcining ZIF‑67, and Ni / PCF is Porous carbon fibers embedded with Ni nanoparticles are dispersed on the surface, and Co / NC is uniformly loaded on the surface of Ni / PCF. The composite cathode material synergistically exploits the high specific surface area, excellent conductivity, high sulfur loading / limiting capacity of the porous carbon fiber / N-doped porous carbon / Ni, Co nanoparticles system, as well as the N-doped sites and Ni, Co nanoparticles The adsorption-catalysis of soluble polysulfides not only achieves high sulfur loading, but also effectively inhibits the "shuttle effect" and alleviates the electrode volume change.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and devices, and in particular relates to a lithium-sulfur battery composite cathode material and a preparation method and application thereof. Background technique [0002] "Clean energy + smart grid" is known as the fourth industrial revolution. Energy storage technology is one of the core technologies urgently needed to realize the grid-connected popularization and application of renewable energy such as solar energy and wind energy and the construction of smart grids. The development trend of clean energy requires that the future development direction of energy storage technology must be: low-cost, long-life, high-efficiency energy storage batteries. Among the existing energy storage systems, lithium-ion batteries (LIBs) are widely used in portable electronic devices, electric vehicles and other fields due to their advantages such as high energy density, long cycle life, small se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/625H01M10/052H01M4/628H01M2004/028Y02E60/10
Inventor 吴玉程吴迪王忠杰刘家琴
Owner HEFEI UNIV OF TECH
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