Oxygen heteroatom enhanced sulfur-rich polymers synthesized by inverse vulcanization for high-performance lithium-sulfur batteries
Oxygen heteroatom enhanced sulfur-rich polymers synthesized by inverse vulcanization for high-performance lithium-sulfur batteries
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DOI：
10.1016/j.jpowsour.2022.231921
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发表时间：
2022-10
影响因子：
9.2
通讯作者：
Haoran Wang;Bowen Zhang;Romy A. Dop;Peiyao Yan;A. R. Neale;L. Hardwick;T. Hasell
中科院分区：
文献类型：
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作者：
Haoran Wang;Bowen Zhang;Romy A. Dop;Peiyao Yan;A. R. Neale;L. Hardwick;T. Hasell
采用反硫化法制备了含可调杂原子交联剂的富硫聚合物，研究了其作为锂硫电池含硫正极活性材料的性能。该聚合物含有高达73%的活性硫，而重要的是，不含任何未反应的结晶硫。对于含有80 wt%硫、10 wt%结构交联剂（双环戊二烯）和10 wt%含氧交联剂（乙二醇二甲基丙烯酸酯）的活性材料聚合物，li - s聚合物电池的比容量为1206 mAh gs−1。在该组合物中获得的高容量与该样品有关，在聚合物结构中具有较高的平均硫阶。此外，与没有功能化杂原子交联剂的聚合物（0.165% /循环）和单质硫（0.312% /循环）相比，带有杂原子交联剂的s -聚合物的容量衰减（0.093% /循环）更低。x射线光电子能谱显示交联剂内酯基羰基氧与长链锂多硫化物之间存在固有的结合，这可能抑制了这些中间体的溶解。
Sulfur-rich polymers, synthesized through inverse vulcanization, with tunable heteroatom containing crosslinkers were investigated as the S-containing cathode active material within Li–S cells. The polymers possess up to 73% active sulfur while, importantly, not containing any unreacted, crystalline sulfur. Li–S-polymer cells achieve specific capacities of 1206 mAh gs−1for an active material polymer containing 80 wt% sulfur, with 10 wt% of a structural crosslinker (dicyclopentadiene), and 10 wt% of an oxygen-containing crosslinker (ethylene glycol dimethacrylate). The high capacity achieved within this composition is associated with of this sample, in a higher average sulfur rank within the polymer structure. Furthermore, S-polymers with heteroatomic crosslinkers exhibited lower capacity fade (0.093% per cycle) compared with polymers without functionalized heteroatomic crosslinkers (0.165% per cycle) and elemental sulfur (0.312% per cycle). X-ray photoelectron spectroscopy showed the inherent binding between the ester group carbonyl oxygen within the crosslinker to the long-chain lithium polysulfides, which may inhibit dissolution of these intermediates.