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Title:
SELF-ASSEMBLED POLYIMIDE POROUS MATERIAL, PREPARATION METHOD THEREFOR AND USE THEREOF IN LITHIUM SULFUR BATTERY
Document Type and Number:
WIPO Patent Application WO/2018/214844
Kind Code:
A1
Abstract:
Disclosed are a self-assembled polyimide porous material, a preparation method therefor and a use thereof in a lithium sulfur battery. An aromatic dianhydride and an aromatic diamine are used as raw materials, and layered porous polyimide particles are formed by means of the self-assembly of molecules in a single organic solvent, and are then subjected to high-temperature carbonization and sulfur washing processes to obtain the self-assembled polyimide porous material. The polyimide porous material is assembled from carbonized polyimide sheet layers, wherein each sheet layer has a thickness of 20-40 nm, and there are gaps of 50-200 nm between the sheet layers. The self-assembled polyimide porous material is used to prepare a positive electrode material for a lithium sulfur battery. The beneficial effects thereof are as follows: the operations are simple and the reaction conditions are mild; the morphology thereof can be controlled only by controlling the reaction time and the concentration of the reactants; the synthesized carbon material itself contains the element nitrogen, and has a certain inhibitory effect on the shuttle of a polysulfide in a lithium sulfur battery; and the size is relatively large, wherein same can reduce the contact resistance, and is favorable for performing charging and discharging at a large rate.

Inventors:
ZHANG FENGXIANG (CN)
ZHAO SHUPENG (CN)
MA YANJIAO (CN)
GUO JUNLING (CN)
Application Number:
PCT/CN2018/087659
Publication Date:
November 29, 2018
Filing Date:
May 21, 2018
Export Citation:
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Assignee:
UNIV DALIAN TECH (CN)
International Classes:
H01M4/36; H01M4/38; H01M4/62; H01M10/052
Foreign References:
CN106997947A2017-08-01
CN106340632A2017-01-18
CN106159205A2016-11-23
CN105336930A2016-02-17
Other References:
ZHIXIAO XU ET AL: "Nitrogen-Doped Porous Carbon Superstructures Derived from Hierarchical Assembly of Polyimide Nanosheets", ADVANCED MATERIALS, vol. 28, no. 10, 11 January 2016 (2016-01-11), pages 1981 - 1987, XP055550407, ISSN: 0935-9648
XIAOQI HAN ET AL: "Nitrogen-doped carbonized polyimide microsphere as a novel anode material for high performance lithium ion capacitors", ELECTROCHIMICA ACTA, vol. 196, 3 March 2016 (2016-03-03), pages 603 - 610, XP029480901, ISSN: 0013-4686, DOI: doi:10.1016/j.electacta.2016.02.185
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