新材料周报：小米SU7 Ultra正式发布，钠电+固态电池中试量产基地开建

Investment Rating - The industry investment rating is "Outperform the Market" [5][56]. Core Insights - The semiconductor materials sector is experiencing accelerated domestic production, with rapid expansion in downstream wafer factories, highlighting the advantages of leading companies in maximizing industry dividends [10]. - The report emphasizes the importance of photoresist as a critical core link in China's self-sufficiency journey, with a positive outlook on Tongcheng New Materials' rapid progress in import substitution [10]. - The demand for high-performance materials is expected to increase as domestic manufacturing upgrades continue, leading to rapid development in the new materials industry [10]. - The report identifies key companies to watch, including Huate Gas in the electronic specialty gas sector, which has been innovating and achieving import substitution [10]. - The report also highlights the growth potential of domestic polymer materials, particularly in the context of carbon neutrality, with recommendations to focus on leading companies in the upstream raw materials sector [10]. Market Overview - The Wind New Materials Index closed at 3686.46 points, down 0.46% week-on-week [3][14]. - Among six sub-industries, the semiconductor materials index rose 0.42% to 6612.31 points, while the organic silicon materials index fell 4.29% to 6046.83 points [3][14]. - The lithium battery index increased by 3.75% to 2002.51 points, indicating a positive trend in that sector [3][14]. Recent Industry Highlights - Xiaomi's SU7 Ultra was officially launched, featuring extensive use of carbon fiber materials and advanced battery technology, priced at 529,900 yuan [4][27]. - The construction of a pilot production base for sodium-ion and solid-state batteries by Zhongna Energy is underway, with a planned total capacity of 2.5GWh [4][36]. - Arkema announced a 15% expansion of its PVDF production capacity to meet the growing demand for high-performance resins in lithium-ion batteries and the semiconductor market [4][33].