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Method for preparing three-dimensional hierarchical pore carbon of lithium-sulfur battery cathode material by template method

A technology for lithium-sulfur batteries and positive electrode materials, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve problems such as low conductivity, achieve low prices, accelerate redox reaction kinetics, and relieve volume expansion

Pending Publication Date: 2020-08-18
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the process of exploring lithium-sulfur batteries, their commercial production faces many difficulties: (1) The conductivity of elemental sulfur at room temperature is only 5×10-30S cm-1, and the product Li2S after full discharge is also the same Has a low electrical conductivity (1×10-14S cm-1), so a good conductive framework is required to provide electron / ion transport media for active materials

Method used

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  • Method for preparing three-dimensional hierarchical pore carbon of lithium-sulfur battery cathode material by template method
  • Method for preparing three-dimensional hierarchical pore carbon of lithium-sulfur battery cathode material by template method
  • Method for preparing three-dimensional hierarchical pore carbon of lithium-sulfur battery cathode material by template method

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specific Embodiment approach 1

[0028] Specific embodiment 1: A template method of this embodiment to prepare three-dimensional hierarchical porous carbon for lithium-sulfur battery cathode material is carried out according to the following steps:

[0029] 1. Preparation of Precursor Film

[0030] Put 2g of cellulose acetate, 0.5g of polymethyl methacrylate and 0.67g of zinc oxide into a clean beaker, add 20ml of N,N-dimethylacetamide as a solvent, heat and stir in a water bath at 50°C for 12h, then Cast the mixed solution on a glass plate and vacuum dry to obtain a white film;

[0031] 2. Preparation of active material carrier conductive carbon materials

[0032] Place the white film obtained in step 1 under a nitrogen atmosphere, raise the temperature to 475°C for 1 hour at a heating rate of 5°C·min Ultrasonic cleaning with % HCl, washing with a large amount of deionized water and drying to obtain a three-dimensional hierarchical porous conductive carbon material;

[0033] 3. Preparation of conductive c...

specific Embodiment approach 2

[0042] Specific embodiment two: The difference between the specific embodiment and the specific embodiment one is that the mass ratio of cellulose acetate and zinc oxide described in step one is 1:1, and the mass ratio of carbon and sulfur in step three is 3:7. Others It is the same as the first embodiment.

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the solvent N,N-dimethylacetamide in step 1 is 22ml. Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention discloses a method for preparing three-dimensional hierarchical pore carbon of a lithium-sulfur battery positive electrode material by a template method, and particularly relates to a preparation method of the lithium-sulfur battery positive electrode material. The preparation method sequentially comprises the following specific steps of 1, preparing a precursor film; 2, preparing anactive substance carrier conductive carbon material; 3, preparing a conductive carbon-sulfur composite material; 4, preparing a positive electrode material of the lithium-sulfur battery; 5, assembling the battery. A battery assembled by the lithium-sulfur battery positive electrode material prepared by the method disclosed by the invention can reach 1314.6 mAh. G <-1 > for the first time at 0.2 C, the capacity retention ratio after 100 cycles is 69.13%, and the average coulombic efficiency is 97.62%. The preparation method has the advantages of simple synthesis process, clean and renewable raw materials, stable electrode structure, good charge-discharge performance of the assembled lithium-sulfur battery and the like, and is applied to the field of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional hierarchical porous carbon for lithium-sulfur battery anode materials by a template method, and specifically relates to the technical field of lithium-sulfur batteries. Background technique [0002] Greenhouse gas emissions have worsened the Earth's climate since the Industrial Revolution. Droughts, torrential rains and rising sea levels are all ominous warning signs. In modern times, fossil energy is being exhausted day by day, and people urgently need green and clean energy storage devices to solve energy problems. Lithium-ion batteries have dominated the battery market since Sony Corporation commercialized lithium-ion batteries in 1991. Compared with lithium batteries with traditional intercalation mechanism, lithium-sulfur batteries have ultra-high energy density (2600Wh kg-1), which is almost six times that of current lithium-ion batteries. At the same time, elemental sulfur is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 李丽波单宇航
Owner HARBIN UNIV OF SCI & TECH
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