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A boron-doped composite for lithium-sulfur battery, a process for preparing said composite, an electrode material and a lithium-sulfur battery comprising said composite

A lithium-sulfur battery and composite technology, applied in the field of lithium-sulfur battery composites, can solve problems such as unsatisfactory cycle performance

Inactive Publication Date: 2017-02-22
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the cycling performance of S / N-C cathodes is still unsatisfactory

Method used

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  • A boron-doped composite for lithium-sulfur battery, a process for preparing said composite, an electrode material and a lithium-sulfur battery comprising said composite
  • A boron-doped composite for lithium-sulfur battery, a process for preparing said composite, an electrode material and a lithium-sulfur battery comprising said composite
  • A boron-doped composite for lithium-sulfur battery, a process for preparing said composite, an electrode material and a lithium-sulfur battery comprising said composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Embodiment 1: Preparation of S / BPC

[0090] 1) Provide boron-doped carbon substrates:

[0091] a) Provide template SBA-15 as reported by Zhao:

[0092] SBA-15 was prepared by the procedure described previously. First, 4 g of Pluronic P123 (EO 20 PO 70 EO 20 ) was dissolved in 120mL of hydrochloric acid (2M). Then 9 mL of tetraethylorthosilicate was added to the solution. The mixture was vigorously stirred at 38°C for 8 minutes, allowed to stand for 24 hours, and then hydrothermally treated in an autoclave at 100°C for a further 24 hours. The white product was filtered, washed, dried, and finally calcined in air at 550°C for 4 hours to obtain SBA-15 without surfactant.

[0093] b) Preparation of BPCs:

[0094] First, 1 gram of boric acid was dissolved in 5 mL of water under the action of ultrasonic waves, and heated at 70 °C for 1 hour. Then add 1 gram of fructose, 0.14 gram of concentrated H 2 SO 4 and 1.0 g of SBA-15 were successively added to the above solu...

Embodiment 2

[0107] Embodiment 2: preparation S / CMK-3

[0108] 1) Provide undoped carbon substrate:

[0109] a) Preparation of SBA-15:

[0110] Repeat the operation of step a) in Example 1.

[0111] b) Preparation of CMK-3:

[0112] As in Example 1, CMK-3 was also prepared using the nanocasting method. Dissolve 1.25 g fructose in 5.0 mL containing 0.14 g concentrated H 2 SO 4 of water. Then 1.0 g of SBA-15 was dispersed in the solution, and sonication was performed for 1 hour. The mixture was heated at 100°C for 12 hours and at 160°C for a further 12 hours, then another 5 mL containing 0.8 g fructose and 0.09 g H 2 SO 4 The aqueous solution repeats the injection process once.

[0113] c) Annealing:

[0114] The obtained dark brown intermediate product was completely carbonized at 900 °C in Ar flow for 5 h.

[0115] d) remove the template:

[0116] To remove the SBA-15 template, the carbonized product was stirred in 10 wt% HF solution for 4 hours. The prepared CMK-3 was collect...

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Abstract

The present invention relates to a composite for lithium-sulfur battery, containing a boron-doped carbon substrate and sulfur loaded; as well as a process for preparing said composite, an electrode material and a lithium-sulfur battery comprising said composite.

Description

technical field [0001] The present invention relates to composites for lithium-sulfur batteries, comprising a boron-doped carbon substrate and loaded sulfur; and methods of preparing said composites, electrode materials comprising said composites, and lithium-sulfur batteries. Background technique [0002] Lithium-sulfur (Li-S) batteries have attracted considerable attention due to their high energy density and low cost. However, the inherent insulating properties of sulfur and the problem of dissolution of polysulfide intermediates into the electrolyte lead to low S utilization and poor battery life of Li-S batteries, thus hindering the commercial application of Li-S batteries. Various carbon materials have been used as substrates to accommodate S to enhance electronic conductivity while confining polysulfides. Although strategies to tune organizational properties are beneficial to address the above issues, methods to alter the intrinsic properties of carbon substrates suc...

Claims

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Application Information

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IPC IPC(8): H01M4/136
CPCH01M4/0471H01M4/136H01M4/362H01M4/38H01M10/052Y02E60/10
Inventor 郭玉国杨春鹏殷雅侠赵娜红陈赟华周龙捷
Owner ROBERT BOSCH GMBH
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