Preparation and performance study of nitrogen-rich binder in lithium-sulfur battery cathodes
Ideal polymer binders for sulfur cathodes should have abundant polar groups for effective polysulfide adsorption to suppress the shuttle effect,together with good binding properties.Herein,a nitrogen-rich com-plex binder(CS&PEI)is synthesized via aqueous mixing of chitosan(CS)with polyethyleneimine(PEI)contai-ning profuse NH2 groups.The CS&PEI binder shows advantageous binding performance and polysulfide ad-sorption over the CS counterpart.As a result,improved rate capability and long-term cyclic stability are exhibi-ted by lithium-sulfur battery assembled from the cathodes with the CS&PEI binder.The specific capacity is re-tained as 814 mAh/g after 150 cycles at 0.2 C,contributed by the suppressed shuttle effect and the integrated cathodes upon cycling.
万方数据
维普
