A battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation method thereof

A technology of bacterial cellulose and bacterial cellulose membrane, which is applied in the battery positive electrode based on N-doped carbonized bacterial cellulose, lithium-sulfur battery and its preparation, to achieve the effects of controlling the shuttle effect, increasing the load capacity, and high specific capacity

Active Publication Date: 2019-06-21
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the small pore content of CBC obtained by high-temperature carbonization is low, so the ability to control the adsorption of soluble polysulfides in Li-S battery operation is relatively limited (Yang Huang et al. Journal of Materials Chemistry A, 2015, 3: 10910-10918 .)

Method used

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  • A battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation method thereof
  • A battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation method thereof
  • A battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation method thereof

Examples

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Embodiment 1

[0027] A method for preparing a positive electrode of a battery based on N-doped carbonized bacterial cellulose, the specific steps are as follows:

[0028] In step 1, the BC membrane with a thickness of 3.0 mm was taken out of the culture medium, and the excess fermentation liquid on the surface of the membrane was washed with deionized water, and then freeze-dried to obtain BC aerogels containing N source.

[0029] Step 2: Flatten the BC airgel containing N source (0.2Mpa positive pressure), and then keep it warm at 800°C for 2h under the protection of an inert atmosphere to obtain NCBC airgel.

[0030] Step 3, infiltrating NCBC airgel into S / CS 2 In the solution, let it stand at room temperature for 2 hours, take it out, put it in a closed container, and keep it at a temperature of 130°C for 6 hours, so that the elemental S is in a molten state and diffuses evenly into the inside of the NCBC mesh, and the S / NCBC positive electrode is obtained after cooling , the S content ...

Embodiment 2

[0037] A method for preparing a positive electrode of a battery based on N-doped carbonized bacterial cellulose, the specific steps are as follows:

[0038] In step 1, the BC membrane with a thickness of 2.0 mm was taken out from the culture medium, and the excess fermentation liquid on the surface of the membrane was washed with deionized water, and then freeze-dried to obtain BC aerogels containing N source.

[0039] Step 2: Flatten the BC airgel containing N source (0.2Mpa positive pressure), and then keep it at 900°C for 1 hour under the protection of an inert atmosphere to obtain NCBC airgel.

[0040] Step 3, infiltrating NCBC airgel into S / CS 2 In the solution, let it stand at room temperature for 4 hours, take it out, put it in a closed container, and keep it at 200°C for 10 hours, so that the elemental S is in a molten state and diffuses evenly into the inside of the NCBC mesh, and the S / NCBC positive electrode is obtained after cooling , the S content of the prepared...

Embodiment 3

[0047] A method for preparing a positive electrode of a battery based on N-doped carbonized bacterial cellulose, the specific steps are as follows:

[0048] In step 1, the BC membrane with a thickness of 2.0 mm was taken out from the culture medium, and the excess fermentation liquid on the surface of the membrane was washed with deionized water, and then freeze-dried to obtain BC aerogels containing N source.

[0049] Step 2: Flatten the BC airgel containing N source (0.2Mpa positive pressure), and then keep it at 1000°C for 1 hour under the protection of an inert atmosphere to obtain NCBC airgel.

[0050] Step 3, infiltrating NCBC airgel into S / CS 2 In the solution, let it stand at room temperature for 6 hours, take it out, put it in a closed container, and keep it at a temperature of 160 ° C for 12 hours, so that the elemental S is in a molten state and diffuses evenly into the inside of the NCBC mesh, and the S / NCBC positive electrode is obtained after cooling , the S con...

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Abstract

The invention discloses a battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, a lithium-sulfur battery and a preparation method thereof. The invention utilizes the N source required in the bacterial cellulose biological culture process to carry out N doping to prepare battery positive electrode materials; prepares a battery interlayer with strong adsorption capacity by combining ultra-light carbonized bacterial cellulose interlayer with porous carbon; by means of ion selection The battery separator material was prepared by combining Nafion, a permanent barrier layer, with bacterial cellulose aerogel, and a lithium-sulfur battery was assembled from a battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, a functional interlayer of carbonized bacterial cellulose, and a Nafion / BC separator. The present invention controls the diffusion of polysulfides to the lithium negative electrode at multiple levels through N element doping, the introduction of functional interlayers, and the combined use of Nafion / BC diaphragms, and realizes multi-level suppression of polysulfide diffusion, effectively controls the shuttle effect, and is formed by assembly. Li‑S batteries have high specific capacity, high Coulombic efficiency, and stable cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and relates to a battery positive electrode based on N-doped carbonized bacterial cellulose, a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is the secondary battery with the best comprehensive performance at present, and has been widely used in various portable devices. With the rapid development of high-energy-consuming equipment and facilities such as electric vehicles, smart grids, and aerospace, the requirements for energy density and power density of lithium-ion batteries are also getting higher and higher. However, due to the limitation of the theoretical lithium storage capacity of cathode materials, traditional lithium-ion secondary batteries are difficult to make breakthroughs in improving energy density, such as the most widely used LiCoO 2 The theoretical energy density of the cathode material is only 387Wh kg -1 , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/66H01M4/62H01M10/0525H01M4/139H01M10/058
CPCH01M4/13H01M4/139H01M4/628H01M4/666H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 黄洋孙瑞宁杨加志张衡陈春涛梁光芸顾焱
Owner NANJING UNIV OF SCI & TECH
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