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 innovative method represents a significant breakthrough in the field of lithium-ion battery technology.
Lithium-ion batteries are widely recognized as one of the most promising electrochemical energy storage systems due to their high operating voltage, lightweight design, high specific energy, low self-discharge rate, long cycle life, absence of memory effect, and reduced environmental impact. However, the development of these batteries has been largely constrained by the performance of cathode materials. The cathode plays a crucial role in determining the overall performance and cost of the battery, making it a key challenge in the advancement of lithium-ion technology.
To address this issue, researchers from the Xinjiang Institute have developed a novel preparation technique for a carbon-coated lithium iron phosphate/vanadium phosphate composite material. This process involves using iron phosphate and vanadium pentoxide as primary raw materials, along with lithium salts. A chelating agent is introduced to enhance homogeneity, followed by mechanical mixing and grinding. The resulting mixture is then heat-treated under an inert atmosphere. Afterward, a carbon source is added, and the material undergoes further heating and calcination. Once cooled to room temperature, a high-performance composite material with a carbon coating is obtained.
When tested, the composite material demonstrated impressive electrochemical performance. At room temperature, it delivered a discharge capacity of 144 mAh/g at a current density of 150 mA/g. Even under extreme conditions, such as -20°C, it maintained a discharge capacity of 105 mAh/g at 30 mA/g. The material exhibits a well-defined crystalline structure and uniform particle morphology, indicating excellent stability and efficiency in both normal and low-temperature environments.
One of the major advantages of this method is the use of inexpensive bulk chemical materials, which significantly reduces production costs. Additionally, the process is straightforward and easily scalable for industrial manufacturing, making it highly suitable for mass production. With its outstanding performance and cost-effectiveness, this new composite material holds great potential for future applications in energy storage systems, electric vehicles, and portable electronics.
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