固态电池因其优异的性能备受关注，但是与传统的液态电池相比，离子传输能力偏弱，原因是固-固界面离子传输困难。本文制备了以聚偏氟乙烯-六氟丙烯（PVDF-HFP）为基的固态电解质膜，并探究PVDF-HFP 和增塑剂乙氧基化三羟甲基丙烷三丙烯酸酯（ETPTA）质量比例为1.0∶0.3、1.0∶0.4、1.0∶0.5 时对电解质膜离子传输的影响，并组装成以磷酸铁锂为正极、锂片为负极的固态电池，研究其电化学性能。研究发现：当PVDF-HFP 和ETPTA 比例为1.0∶0.4 时，锂离子迁移数达0.89，电化学窗口可达4 V，离子电导率达到8×10-5 S/cm，表现出良好的稳定性。将比例为1.0∶0.4 的电解质膜装配成固态电池，经过激活之后，首先在0.1 C 的倍率下进行测试，首圈充电比容量为133 mA·h/g，首圈放电比容量为129 mA·h/g；在20 圈循环测试后，放电比容量也能保持在120 mA·h/g 以上，容量保持率为92%。
Electrolyte interface resistance and low ionic conductivity are essential issues for commercializing solid-state lithium metal batteries (SSLMBs). This work details the fabrication of a double-layer solid composite electrolyte (DLSCE) for SSLMBs. The composite comprises poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF‒HFP) and poly(methyl methacrylate) (PMMA) combined with 10 wt.% of Li6.4La3Zr1.4Ta0.6O12 (LLZTO), synthesized through an ultraviolet curing process. The ionic conductivity of the DLSCE (2.6 × 10−4 S·cm−1) at room temperature is the high lithium-ion transference number (0.57), and the tensile strength is 17.8 MPa. When this DLSCE was assembled, the resulted LFP/DLSCE/Li battery exhibited excellent rate performance, with the discharge specific capacities of 162.4, 146.9, 93.6, and 64.0 mA·h·g−1 at 0.1, 0.2, 0.5, and 1 C, respectively. Furthermore, the DLSCE demonstrates remarkable stability with lithium metal batteries, facilitating the stable operation of a Li/Li symmetric battery for over 200 h at both 0.1 and 0.2 mA·cm−2. Notably, the formation of lithium dendrites is also effectively inhibited during cycling. This work provides a novel design strategy and preparation method for solid composite electrolytes.
激光选区熔化技术(selective laser melting,SLM)是一种以粉末为原材料的金属增材制造技术,通过对激光选区熔化技术制备316L不锈钢零件的成形工艺参数(激光功率、打印速度)进行变更,研究不同参数对316L不锈钢SLM成形零件材料组织形貌及微观结构的影响,优化316L不锈钢SLM成形工艺参数,保证316L不锈钢的致密成形.采用扫描电子显微镜(SEM)、光学金相显微镜(OM)等测试方法为激光选区熔化成形316L不锈钢提供合理参数与方法.结果表明:SLM成形316L不锈钢试样组织主要由奥氏体组成;当激光功率较大时,不锈钢内部有极大概率会出现未熔化的颗粒;当激光功率为290 W,打印速度为800 mm/s时,试样内部组织较为致密,为最佳的打印工艺参数.
Under the condition of 80℃ and lauryl sodium sulfide was used as the emulsor, organosilicone prepolymer and arcylic ester (mass ratio was 8%)were copolymerised, the arcylic resin emulsion modified by organosilicone was obtained. The temperature of the emulsion was then reduced to 40℃, 3% photopolymerisable monomer (based on mass of acrylic resin) and 3% photo-initiator 184 (based on mass of photopolymerisable monomer) were added, the UV-curable organosilicon acrylic resin emulsion was yielded by stirred for 0.5 h. The film of the resin irradiated by UV-light has break elongation of 367%, tensile strength of 19.3MPa, water absorption rate of 32.2% and glass transition temperature(Tg) of -45.7℃.
