Ya-feng Deng,Yong Chen,Xiu-li Zhang,Qian Zhang,Zi-jian Wei,Dong Wang
An in-situ one-step hydrothermal method is used to prepare hybrid CuSe@NiSe nanosheets with vertical orientation and interpenetrating structure on the surface of copper foam (S-CuSe@NiSe). The S-CuSe@NiSe has excellent electrochemical performance and outstanding cycling performance. The specific capacitance of the S-CuSe@NiSe is 1478 F g -1 at a current density of 1 A g -1 and stabilizes at 990 F g -1 at 8 A g -1 . The specific capacitance retention of S-CuSe@NiSe is 81.7% after 10,000 cycles. The all-solid-state flexible capacitors prepared with S-CuSe@NiSe as electrode (S-CuSe@NiSe-SFCs) also exhibit excellent flexibility, superior electrochemical performance and cycle stability. Its capacitance reaches 333 F g -1 at a current density of 1 A g -1 . Capacitance retention of 79.3% has been obtained after 10,000 charge-discharge cycles at 2 A g -1 .
Jie Zhao,Saifang Huang,Yuyan Zhao,Bing Wu,Haiqin Lin,Zixuan Chen,Yudong Zhang,Weiji Dai,Can Cui
Solid-state lithium metal batteries (SSLMBs) face critical challenges, including low ionic conductivity, unstable electrode–electrolyte interfaces, and lithium dendrite growth issues. To address these issues, we designed a PVDF-based composite electrolyte embedded with NiSe nanosheets (PVDF-NS). The two-dimensional NiSe facilitated the in situ formation of Li2Se at the interface, promoting dendrite suppression by enhancing Li+ transport (room-temperature ionic conductivity: 5.53 × 10–4 S·cm–1; transference number: 0.449) and constructing a stable SEI layer. Notably, PVDF-NS supported Li||Li symmetric cells demonstrated excellent stability for over 2000 h at 0.2 mA·cm–2. When paired with NCM811 cathodes, full cells demonstrated 86.3% capacity retention over 300 cycles at 2 C. Additionally, the electrolyte exhibited high oxidative stability (4.83 V vs Li+/Li) and retained a capacity of 65.6 mAh·g–1 at 5 C, underscoring its practical applicability. This interfacial engineering approach presents a scalable and effective route for developing durable, high-performance solid electrolytes for next-generation SSLMBs.
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