Hui Chang,Hongkai Hu,Weiya Li,Guohong Kang,Vladimir G. Sergeyev,Wei Liu,Yongcheng Jin
The advancement of solid-state lithium metal batteries (SSLMBs) with high rate capability possess challenges due to the relatively slow kinetics of ion transport properties and the lack of compatibility between the phases derived from solid-state electrolytes. Here, the tris(pentafluorophenyl) boron (TPFPB) is incorporated as an highly effective additive into a poly(ionic liquid)-based solid-state composite polymer electrolyte (CPE) to realize SSLMBs with enhanced high rate performance. The theoretical calculation and experimental analysis demonstrated that the TPFPB serves as an anion receptor agent and a modifier of the electrode/electrolyte interphase. In a notable advancement, the ionic conductivity, lithium transport kinetics, and electrochemical stability of CPE have been significantly enhanced. Additionally, TPFPB has demonstrated an impressive capacity to suppress undesirable side reactions with both the cathode and lithium anode. The presence of Li 2 O, Li 2 CO 3 and an adequate amount of LiF derived from TPFPB in the interphase between the CPE and Li metal anode results in enhanced high-rate performance. The reasonable design enables the achievement of a considerable ion conductivity of 5.28 × 10 −4 S cm −1 (25 °C) and a lithium-ion transference number of 0.48 for CPE. The solid-state LiFePO 4 /CPE/Li batteries delivers excellent rate performance and cycle stability, with a high discharge specific capacity of 94.4 mAh g −1 at 10 C (1 mA cm −2 ) and a remarkable capacity retention of 76.5 % after 700 cycles at 8 C. Moreover, the TPFPB functionalized CPE is capable of operating in conjunction with the high-voltage LiNi 0.85 Co 0.15 Al 0.05 O 2 cathode. The excellent performance of the as-prepared SSLMBs at a wide temperature range of −15 °C and 60 °C also verified that the effectiveness of TPFPB as additives into solid-state electrolytes.
Boyang Zhang,Xiaola Li,Ziyang Liang,Wenzhao Huang,Yuqing Liu,Chenyu Liu,Zhan Lin,Dong Luo
Lithium-rich manganese-based oxides (LMOs) are regarded as promising cathodes for next-generation high-energy Li-ion batteries due to their ultrahigh discharge capacity (>250 mAh/g) and low cost. However, their practical application is significantly hindered by issues such as transition metal dissolution and structural evolution under high working voltage. In this study, a stable SEI protective film based on carbon phosphorus is successfully constructed by introducing two solid–liquid interface-stabilizing additives, ethylene carbonate (VC) and tri(pentafluorophenyl)borane (TPFPB), into the base electrolyte. This significantly enhances the interface stability between the lithium-rich manganese-based cathode material and the electrolyte, suppresses the generation of harmful HF and the dissolution of transition metals, thereby improving the overall stability of the electrode–electrolyte system. Experimental results indicate that after 200 cycles, the capacity retention of the LMO cathode is increased by 21% due to the significant suppression of nanopore formation and phase transitions. This additive optimization strategy provides promising technical guidance for the application of lithium-rich manganese-based oxide cathode materials in next-generation high-energy-density rechargeable batteries.
Haoyue Li,Qintao Wang,Haimin Li,Jia Zhuang,Heng Guo,Xingchong Liu,Hanyu Wang,Ronghong Zheng,Xiaoli Gong
As a superstars of photovoltaic devices, organic–inorganic hybrid perovskite solar cells (PSCs) have garnered plenty of interest due to their superior character. However, many defects, such as carrier recombination, inferior stability, poor interface contact, have prevented their further development. Here, we demonstrate a novel approach of interface engineering to form a compact perovskite layer with decreased defects on SnO2 film by adding tris(pentafluorophenyl)boron (TPFPB) as an interfacial modification layer, which validly improves the interface performance and enhances the crystallinity of MAPbI3. Hence the planar MAPbI3 PSCs with TPFPB modification show fast charge transfer and low trap state density with an enhanced champion power conversion efficiency (PCE) from the original of 16.92% to 19.41%, as well as long-term stability with 80.7% of its initial PCE after 1000 h of aging in N2 atmosphere without encapsulation, while the pristine one only shows 68.9% of the original PCE. The results reveal that TPFPB can be used as an effective interface modification layer for high efficiency and stability PSCs, and it maybe also be used in other devices due to its superior interface modification for high quality crystallinity thin films.
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