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1. (WO2018184156) PREPARATION METHOD OF COMPOSITE MATERIAL HAVING NITROGEN-DOPED GRAPHENE/MANGANESE DIOXIDE/HOLLOW SULFUR PARTICLES

Pub. No.:    WO/2018/184156    International Application No.:    PCT/CN2017/079505
Publication Date: Fri Oct 12 01:59:59 CEST 2018 International Filing Date: Thu Apr 06 01:59:59 CEST 2017
IPC: H01M 4/36
H01M 4/38
H01M 4/62
H01M 10/052
B82Y 30/00
Applicants: SHENZHEN PEICHENG TECHNOLOGY CO., LTD
深圳市佩成科技有限责任公司
Inventors: ZHONG, Linglong
钟玲珑
Title: PREPARATION METHOD OF COMPOSITE MATERIAL HAVING NITROGEN-DOPED GRAPHENE/MANGANESE DIOXIDE/HOLLOW SULFUR PARTICLES
Abstract:
Provided in the present invention is a preparation method of a composite material having nitrogen-doped graphene/manganese dioxide/hollow sulfur particles, the method comprising the following steps: step (1), adding sulfur powder into carbon disulfide, and stirring and dissolving the same to obtain a homogeneous solution; step (2), ball milling high purity nickel powder by means of a high energy ball mill, adding the ball-milled product into the aforementioned solution, stirring the same to form a homogeneous suspension, performing mechanical stirring, and spraying and drying to obtain sulfur-coated spherical particles; step (3), adding the spherical particles into a solution added with iron chloride, stirring to react, and rinsing with water and filtering; and step (4), adding the filtered-out precipitate into a solution containing manganese chloride and potassium permanganate, stirring to form a homogeneous suspension, heating and stirring to react, and performing centrifugation and water rinsing to obtain sulfur particles coated with manganese dioxide. The composite material is designed to have a hollow structure to reserve space for volume expansion of the sulfur material during a charging or discharging process, thus effectively improving electrochemical properties.