Organosilicon materials: the "invisible guardians" of the new energy and energy storage industries.
Unassuming organosilicon is sparking a materials revolution in the new energy field!
In today's booming new energy industry, while we focus on battery energy density and photovoltaic conversion efficiency, a type of "invisible material" is silently safeguarding the safety and stability of new energy systems-organosilicon materials. From photovoltaic encapsulation to battery thermal management, from electrolyte additives to buffer protection, organosilicon, with its unique molecular structure and properties, has become an indispensable key material in the new energy field.
The "Guardian Angel" of the Photovoltaic Industry: Organosilicon Encapsulation Materials
In the photovoltaic field, modules are exposed to the outdoors for extended periods, facing multiple challenges including ultraviolet radiation, temperature variations, and moisture corrosion. The Polymer Energy Chemistry team at Gannan Normal University recently developed a high-performance organosilicon elastomer encapsulation material. This not only drives innovation in photovoltaic cell encapsulation technology but also effectively solves key challenges related to flame retardancy, environmental friendliness, and wear resistance.
The value of this encapsulation material lies not only in its protection but also in its ability to improve power generation efficiency. Researchers at Sichuan University have developed an ultra-slippery, self-cleaning coating based on silicone resin and methyl silicone oil, which can be applied to the surface of photovoltaic panels. This coating is not only hydrophobic (with a static water contact angle of up to 109°), but also possesses excellent optical transmittance, which can improve the initial efficiency of solar cells by 0.18%. Even more surprisingly, the coating's performance remains essentially unchanged even after 100 cycles of polishing with 400-grit sandpaper.
A "firewall" for battery safety: Organosilicon thermal management and protection materials
Battery thermal runaway is the biggest safety challenge facing new energy vehicles and energy storage power stations. When a single battery experiences thermal runaway, preventing heat propagation and stopping the spread of fire becomes a key technological challenge.
The "Research and Development of High Thermal Conductivity and Strong Insulation Multifunctional Organosilicon Materials" project recently launched by Wuhan University of Technology has invested 10.94 million yuan to overcome the core technologies of thermal management materials. This material will simultaneously meet the dual requirements of high thermal conductivity and strong insulation, providing a solution for dissipating heat from power batteries and preventing short circuits.
The "buffer" of the battery module: achieving both lightweight and safety
In battery modules, a buffer pad is needed between the battery cell and the module end plate to perform multiple functions such as mechanical buffering, thermal management assistance, and electrical insulation protection. The manufacturing of polyurethane buffer pads is inseparable from the "precise control" of special silicone oil.
Specialized silicone oil acts as a "cell regulator" and "interface stabilizer" in the polyurethane foaming process. By precisely controlling the gas-liquid interfacial tension, it enables hundreds of millions of micron-sized bubbles to nucleate and grow uniformly and orderly, increasing the closed-cell rate to over 92%. Experiments show that after adding specialized silicone oil, the average pore diameter decreased from 450 μm to 280 μm, and the standard deviation of pore size distribution was reduced by 40%.
This precise control not only leads to structural optimization but also performance improvement. The compression set of the buffer pad containing special silicone oil decreased from 18.7% to 9.3% after 1000 hours at 85℃, while the thermal decomposition initiation temperature increased from 275℃ to 298℃. More importantly, in electrolyte compatibility testing, the mass change rate of the buffer pad modified with special silicone oil was only -0.03%, while ordinary materials exhibited surface powdering and cracking.
"Stabilizer" for high-voltage batteries: Organosilicon electrolyte additives
As lithium-ion batteries move towards higher voltages, traditional electrolytes are prone to decomposition under high voltage, affecting battery performance. Researchers at Hubei University have discovered that using bis(trimethylsiloxymethylsilane) (HTMS) as a high-voltage additive can effectively solve this problem.
The silicon-oxygen bonds (Si-O) in HTMS can bind to acidic products in the electrolyte, slowing down their corrosion of the cathode material. Simultaneously, in conjunction with fluoroethylene carbonate (FEC), a low-resistivity interface layer containing lithium fluoride and organosilicon compounds is formed between the electrode and the electrolyte. Li/LNMO batteries using this technology maintain a high capacity of 120.78 mAh/g after 100 cycles at 1C under a high voltage of 5V. Even more impressively, at a low temperature of -20℃, the battery still maintains a specific capacity of 103.96 mAh/g after 200 cycles at 1C, significantly outperforming traditional electrolytes.
Future Outlook: The Limitless Potential of Organosilicon in the New Energy Field
From photovoltaic packaging to battery thermal management, from electrolyte additives to buffer protection, organosilicon materials are becoming an indispensable key material in the new energy industry due to their excellent high and low temperature resistance, electrical insulation, chemical stability and designability.
In the future, with the continued development of new energy vehicles, energy storage power stations, photovoltaic power generation, and other fields, the requirements for material performance will become more stringent. High thermal conductivity, strong insulation, high voltage resistance, and high temperature resistance will become important development directions for organosilicon materials. As demonstrated by the project at Wuhan University of Technology, through precise molecular design and formulation optimization, organosilicon materials are expected to achieve industrialization breakthroughs within 1-2 years, providing reliable and low-cost domestically produced materials for my country's new energy industry.
In this new energy revolution, organosilicon materials may not be the most dazzling protagonists, but they are the "invisible heroes" who silently safeguard the safety and stability of the system. With the continuous advancement of materials science, this "invisible guardian" will play an increasingly important role in the field of new energy.
