Capture of Polysulfides Enabled by a Nitrogen-Doped Carbon-Coated Halloysite Nanotube-Modified Separator to Enhance Performance for Lithium–Sulfur Batteries

• DOI: 10.1021/acsami.4c19937
• Publication Date: 2024-12-18T11:04:56Z
• Authors: Qingyu Zhang; Yangai Liu; Bing Zhu; Yaning Du; Zhaofeng Tian; Zhaohui Huang
• Keywords: Separator (oil production); Halloysite; Lithium–sulfur battery; Carbon fibers

Lithium–sulfur (Li–S) batteries stand out as highly promising energy storage systems because of their superior theoretical capacity and the affordability sulfur an active material. However, inherent drawbacks have hindered commercialization Li–S batteries. Of these, polysulfide shuttle effect is one most critical issues, leading to rapid decline in battery capacity. To specifically address this issue, we successfully synthesized nitrogen-doped carbon-coated halloysite nanotubes (HNT@NC) using a one-step sintering method modified Celgard 2325 separator on side facing cathode (HNT@NC-Separator). The study found that HNT@NC-Separator exhibits excellent electrolyte wettability superb mechanical strength. Its surface has abundant polar sites effectively capture lithium polysulfides, thereby improving cycling rate performance At current density 0.2 C, assembled with achieved initial discharge 840.8 mAh g–1, maintaining 486.1 g–1 after 100 cycles. 1 was 770.4 412.9 In test, retention exceeded 75%.