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Battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation methods therefor

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 field, to achieve the effect of increasing load capacity, high specific capacity, and stable cycle performance

Active Publication Date: 2017-04-26
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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  • Battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation methods therefor
  • Battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation methods therefor
  • Battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, lithium-sulfur battery and preparation methods therefor

Examples

Experimental program
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Effect test

Embodiment 1

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

[0028] Step 1. Remove the BC membrane with a thickness of 3.0mm from the culture medium, rinse the excess fermentation liquid on the membrane surface with deionized water, and then freeze-dry to obtain a BC aerogel containing N source.

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

[0030] Step 3. Infiltrate NCBC aerogel into S / CS 2 In the solution, let stand at room temperature for 2h, take it out and put it in a closed container, keep it at 130℃ for 6h, make the elemental S in a molten state, and evenly diffuse into the inside of the NCBC mesh, after cooling, the S / NCBC positive electrode is obtained The prepared S / NCBC cathode material contains 75wt% of S.

[0031] A Li-S battery assembled using the above N-d...

Embodiment 2

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

[0038] Step 1. Remove the BC membrane with a thickness of 2.0mm from the culture medium, rinse the excess fermentation liquid on the membrane surface with deionized water, and then freeze-dry to obtain a BC aerogel containing N source.

[0039] Step 2, flatten the BC aerogel 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 aerogel.

[0040] Step 3. Infiltrate NCBC aerogel into S / CS 2 In the solution, let it stand at room temperature for 4h, take it out and put it in a closed container, keep it at 200℃ for 10h, make the elemental S in a molten state, and evenly diffuse into the inside of the NCBC mesh, after cooling, the S / NCBC positive electrode is obtained The prepared S / NCBC cathode material contains 80wt% of S.

[0041] A Li-S battery assembled using the above ...

Embodiment 3

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

[0048] Step 1. Remove the BC membrane with a thickness of 2.0mm from the culture medium, rinse the excess fermentation liquid on the membrane surface with deionized water, and then freeze-dry to obtain a BC aerogel containing N source.

[0049] Step 2, flatten the BC aerogel 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 aerogel.

[0050] Step 3. Infiltrate NCBC aerogel into S / CS 2 In the solution, let it stand at room temperature for 6h, take it out and put it in a closed container, keep it at 160℃ for 12h, make the elemental S in a molten state, and evenly diffuse into the inside of the NCBC mesh, after cooling, the S / NCBC positive electrode is obtained The prepared S / NCBC positive electrode material contains 82wt% of S.

[0051] A Li-S battery assembled usin...

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Abstract

The invention discloses a battery positive electrode based on nitrogen-doped carbonized bacterial cellulose, a lithium-sulfur battery and preparation methods therefor. An N source required in a bacterial cellulose biological culture process is adopted for N doping to prepare a battery positive electrode material; a battery sandwich layer with strong adsorption capacity is prepared by compounding of a super-light carbonized bacterial cellulose sandwich layer and porous carbon; a battery diaphragm material is prepared by combination of an ion selectivity barrier layer Nafion and bacterial cellulose aerogel; and the battery positive electrode based on the nitrogen-doped carbonized bacterial cellulose, the carbonized bacterial cellulose functional sandwich layer, and the Nafion / BC diaphragm are assembled into the lithium-sulfur battery. By virtue of the N element doping, the functional sandwich layer introducing and joint use of the Nafion / BC diaphragm, the dispersion of polysulfide to a lithium negative electrode is controlled in a multi-dimension manner, so that multi-level suppression specific to the dispersion of polysulfide is realized, and a shuttle effect is effectively controlled; and the assembled Li-S battery has 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 batteries are currently the best secondary batteries with the best overall performance and have 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 energy density and power density requirements of lithium-ion batteries are becoming higher and higher. However, traditional lithium ion secondary batteries are restricted by the theoretical lithium storage capacity of the positive electrode material, and it is difficult to make breakthrough progress in increasing the energy density, such as the most widely used LiCoO 2 The theoretical energy density of the cathode material is only ...

Claims

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Application Information

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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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