Bingsheng Qin,Zhihong Liu,Jie Zheng,Pu Hu,Guoliang Ding,Chuanjian Zhang,Jianghui Zhao,Desheng Kong,Guanglei Cui
A couple of thermally stable polyborate salts, polymeric lithium pentaerythrite borate (PLPB) and polymeric lithium di(trimethylolpropane)borate (PLDB), for applications in lithium ion batteries were synthesized via a facile one-step reaction in aqueous solution. Both the lithium polyborate salts exhibited a high thermal decomposition temperature at about 240 °C. Besides, their corresponding single-ion dominantly conducting gel polymer electrolytes of ethylene carbonate (EC) and dimethyl carbonate (DMC) (1 : 1, v/v) swollen PLPB@PVDF-HFP (poly(vinylidenefluoride-co-hexafluoropropene)) and PLDB@PVDF-HFP exhibited favorable ionic conductivity over a wide temperature range, superior electrochemical stability, high lithium ion transference number and Al passivating ability. The Li/LiFePO4 batteries using these single-ion dominantly conducting electrolytes exhibited stable charge–discharge behavior and excellent cycling performance both at room temperature and at elevated temperatures. These superior performances could make this class of gel polymer electrolytes very promising candidates for lithium batteries especially at elevated temperatures.
Shiyu Xiong,Xingwei Ding,Ling Zhou,Ziqian Liu,Wenyan Jiang,Fanrong Ai,Kaiyong Cai
The management of diabetic wounds (DW) is a significant challenge within the medical field. Effectively regulating the levels of reactive oxygen species (ROS) at the wound site and orchestrating the inflammatory response are effective strategies for DW treatment. In this study, a novel hydrogel was developed by cross-linking polyboronic acid-modified carboxymethyl chitosan with herbal active ingredient rosmarinic acid (RA), an active herbal ingredient, through dynamic boronic esters formation. In this RA hydrogel (RAgel), RA serves both as an active pharmaceutical ingredient and as a linker for the creation of a dynamic covalent hydrogel, which can decrease the potential toxicity of chemical crosslinking agents and improve the utilization of RA. RAgel demonstrated potential for controlling RA loading and responsiveness to ROS and glucose levels in a diabetic wound environment. Additionally, the intrinsic antioxidant and antibacterial properties of RA were effectively preserved and enhanced upon integration into RAgel. Furthermore, RAgel not only promoted the migration of L929 cells, a key aspect of tissue repair, but also induced M2 polarization in macrophages,while inhibiting the secretion of pro-inflammatory cytokines. In a murine model of diabetic wound healing, RAgel significantly enhanced the proliferation of both the epidermal and granulation tissues. It also exerts a marked anti-inflammatory effect and promotes collagen deposition, thereby expediting the overall wound healing process. The reported RAgel formulation has potential to address the complex challenges associated with diabetic wound management.
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