Effect of cross-linking of polymer precursors on electrochemical properties of resultant carbons

Urea-formaldehyde resin and polymethacrylate, as two typical polymers for h eterochain and carbon chain polymers, respectively, were synthesized and py rolyzed to prepare carbonaceous materials for the anode of lithium ion batt eries. The effect of cross-link-mg structure of both polymeric precursors o n the physical and electrochemical properties of as-prepared carbons was in vestigated by thermal analysis, X-ray diffraction and cyclic charge/dischar ge method and compared with each other. It was found that, even though two typical types of polymers were used, the two types of resultant carbons sho wed the same trend with the change of cross-linking density of polymers in the size of graphene layers and in the lithium accommodation capacity, The same positive influence of the cross-link structure of both representative polymers on the ability of lithium insertion in resultant carbons was confi rmed.,(C) 2001 Elsevier Science B.V. All rights reserved.