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release time:2024-03-18 Hits: Popular:AG11 battery
New breakthrough in battery technology: 3.7v 2200mah 18650 lithium battery
The "Key Technologies for Lithium Iron Phosphate Power Battery Manufacturing and Application Process" project is a model case of industrial breakthroughs achieved through close industry-university-research cooperation. Professor Ma Zifeng's team is an influential electrochemical energy technology innovation team in China. They proposed a new reaction for the synthesis of LiFePO4 (LFP) based on FePO4 and went deep into this scientific research project.
Lithium iron phosphate cathode material is a kind of environmentally friendly power and energy storage battery system with good safety and long cycle life. It uses abundant iron and phosphorus elements without the need for expensive non-ferrous metals such as cobalt and nickel. Lithium iron phosphate power Batteries will play a long-term role in future new energy vehicles, especially large-scale transportation vehicles and large-scale energy storage systems. To achieve its sustainable development, it is necessary to develop a greener and more atom-economical lithium iron phosphate synthesis process, optimize the lithium iron phosphate power battery system and its manufacturing process, and improve the accuracy and efficiency of application system management and control. This project conducts systematic research on the technical needs for sustainable development of lithium iron phosphate batteries. The main research contents and technological innovation points are as follows:
Innovation point 1: New process for synthesis and modification of lithium iron phosphate materials
In order to synthesize high-quality lithium iron phosphate cathode materials, an atomically economical synthesis reaction using elemental iron and iron phosphate as iron sources was proposed for the first time: Fe+2FePO4.0.5H2O=3LiFePO4+0.5H2O, and sucrose was added during the reaction. LiFePO/C composite cathode material is obtained through polypyrrole and other carbon coating processes, with a specific capacity of 165mAh/g, close to the theoretical capacity of 170mAh/g. A continuous nano-lithium iron phosphate synthesis process from nano-spherical lithium iron phosphate synthesis to high-temperature carbon fusion has been developed, which has improved the rate characteristics and cycle stability of lithium iron phosphate materials.
Innovation point 2: Optimization of design and manufacturing process of lithium iron phosphate power battery
Optimize the 3.7v 2200mah 18650 lithium battery material system, improve the energy density of the battery through the development and improvement of silicon-based negative electrode materials, take the lead in introducing the quaternary solvent system, and develop flame-retardant and low-temperature electrolytes and gel electrolytes respectively, improving the battery for the first time Coulombic efficiency and low temperature charging characteristics. In the electrode manufacturing process, the concept of mixing multiple positive active components is proposed, and lithium iron phosphate and other active components are combined with carbon nanotubes or graphene to improve battery performance and capacity; the aluminum foil is pre-coated with nano-conductive carbon substrate to improve battery performance and capacity. Positive electrode performance, reducing the shedding of positive electrode sheets to improve battery production batch consistency.
Innovation point 3: Battery state prediction model and application system construction
Based on the analysis of battery reaction transfer mechanism and operating characteristics, a prediction mechanism model for battery state of charge (SOC), state of health (SOH) and power state (SOP) was established, and a solution based on the open circuit voltage (OCV) model and its global optimization was developed. technology. The model has been verified by NASA's standard battery database, confirming that the model's SOC prediction accuracy is high and the error is less than 1%. Apply relevant models to the development of battery management systems, propose new technologies for battery module and power system assembly design, and develop large-capacity energy storage systems for balancing the power grid.
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