The "Preparation Method of a Lithium Iron Phosphate/Vanadium Phosphate Composite Material," developed by researchers at the Xinjiang Institute of Physical and Chemical Technology, part of the Chinese Academy of Sciences, has been granted a national invention patent (Patent Number: ZL201110219480.7). This breakthrough represents a significant advancement in the field of lithium-ion battery technology.
Lithium-ion batteries are widely recognized as a key electrochemical energy source due to their high operating voltage, lightweight design, high specific energy, low self-discharge rate, long cycle life, no memory effect, and reduced environmental impact. However, the cathode material remains one of the most critical factors that influence the performance and development of lithium-ion batteries. The quality of the cathode directly affects the battery's overall performance and cost, making it a major bottleneck in the broader lithium industry.
To address these challenges, scientists from the Xinjiang Institute have developed an innovative method for producing a carbon-coated lithium iron phosphate/vanadium phosphate composite material. The process involves using iron phosphate and vanadium pentoxide as primary raw materials, combined with lithium salts. A chelating agent is added to the mixture, which is then ground and homogenized. After heat treatment under an inert atmosphere, a carbon source is introduced, followed by further heating and calcination. Once cooled to room temperature, the resulting composite material is coated with carbon, enhancing its electrochemical properties.
When tested, this composite material demonstrated impressive performance. At room temperature, it delivered a discharge capacity of 144 mAh/g at a current density of 150 mA/g. Even at -20°C, it maintained a capacity of 105 mAh/g at 30 mA/g, showcasing excellent low-temperature performance. The material also exhibits a complete crystal structure and regular particle morphology, making it highly suitable for advanced battery applications.
What makes this method particularly promising is the use of inexpensive bulk chemical raw materials, along with a simple and scalable production process. These advantages make it highly feasible for large-scale industrial manufacturing. With its superior performance and cost-effectiveness, this composite material holds great potential for future applications in energy storage systems, electric vehicles, and other emerging technologies.
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