Zirconia ceramic positioning pin ceramic positioning needle performance characteristics: good wear resistance, long service life. High precision, R angle can be processed as required, corrosion resistance is good, can be directly operated by hand, no special preservation is required. The coefficient of thermal expansion is smaller than that of steel. Quality characteristics: roughness ≤ Ra0.20mm Product accuracy: ± 0.001 mm, ± 0.002 mm, ± 0.005 mm. The diameter is from 0.8mm to 30mm, the minimum interval is 0.01mm, the length is generally 3mm-----50mm or other special requirements according to customer requirements. Uses: on precision equipment such as electroplating equipment Zirconia Ceramic Pin,Ceramic Welding Location Pins,Alumina Zirconia,Zirconia Medical Ceramic Pin Dongguan Haikun New Material Co., Ltd. , https://www.hkceram.com
In recent years, low-speed electric bicycles have gained significant popularity in certain cities across Shandong due to their economic efficiency, low operating costs, and convenient charging options. However, the widespread use of lead-acid batteries in these vehicles has hindered their development, primarily due to environmental concerns and other related issues.
To address these challenges, lithium-ion capacitors have emerged as a promising green energy solution. With an energy density of 30 Wh/kg, they offer high energy and power densities, making them a strong alternative to traditional lead-acid batteries. Under the national "863" project (2011AA050905) and the support of Qingdao City's Strategic Emerging Industry Incubation Project (13-4-1-10-gx), a research team led by Senior Engineer Han Pengxian and Engineer Yao Jianhua from the Advanced Energy Storage Technology Center at the Qingdao Institute of Bioenergy and Process Research, Chinese Academy of Sciences, successfully developed key process technologies for lithium-ion capacitors. This includes pre-embedded lithium technology, leveraging Qingdao’s abundant graphite resources, and achieving a cycle life with over 93% capacity retention after 1,500 charge-discharge cycles. The technology has been patented and is now protected nationally.
Moreover, the team explored graphene-based carbon electrode materials to enhance the high-value utilization of local graphite. Their work was published in journals such as *Journal of Materials Chemistry* (2012, 22: 24918) and *Journal of Materials Chemistry A* (2013, 1: 5949). They also investigated catalytic materials for vanadium flow batteries, focusing on high-performance graphene-based materials. Their studies, including the preparation of RuSe/reduced graphene oxide nanocomposites, significantly improved redox reversibility and battery performance, as reported in *RSC Advances* (2014, 4: 20379).
In addition to electrode materials, the electrolyte used in lithium-ion batteries plays a crucial role in enhancing energy density. Lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) has shown superior thermal stability, conductivity, and electrochemical performance compared to lithium hexafluorophosphate. However, addressing aluminum foil corrosion and reducing internal resistance at high potential windows remains a critical challenge.
Researchers have successfully developed a flexible graphite film with a highly oriented structure that demonstrates excellent electrochemical corrosion resistance in LiTFSI-based electrolytes. At room temperature, the single cell retained over 89% of its capacity after 1,000 cycles, and at 55°C, it maintained more than 80% after 300 cycles. In contrast, when using aluminum foil as a current collector, severe corrosion occurred after just 10 cycles, leading to electrode delamination and rapid capacity loss (*Electrochem. Commun.*, 2014, DOI: 10.1016/j.elecom.2014.05.001).
These advancements highlight the growing potential of lithium-ion capacitors and advanced electrolyte systems in shaping the future of energy storage solutions.