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Technological breakthroughs in negative electrode materials

The improvement of negative electrode materials is also a key link in improving the energy density of lithium iron phosphate batteries. At present, in addition to graphite, other materials that may improve the performance of negative electrode materials, including silicon and various oxide additives, are added to traditional graphite. This is currently a feasible method, and many companies are already adopting it. Huang Yunhui stated that adding these materials as additives to the negative electrode is completely feasible, but the amount added should not be too large.

Huang Yunhui revealed that currently, China has just launched the key 863 major project for the preparation and application of nano functional materials for energy and vehicles. This project is important for producing high specific energy battery materials. We propose a unipolar battery with an energy density of over 260Wh/kg. The positive electrode materials are lithium rich layered and high nickel layered positive electrode materials; Regarding negative electrode materials, we also need to break through the traditional graphite system, so we are currently selecting hard carbon and silicon based materials for research and development. In addition, the capacity of hard carbon materials is also quite high. For example, a type of hard carbon materials that we use as precursors through polymer materials exhibit excellent performance. The energy density of the single cell battery produced in this way should reach over 280Wh/kg.

In addition, Huang Yunhui believes that many experts in car manufacturing now hope to increase the energy density of lithium-ion batteries to over 450Wh/kg, which is impossible for traditional lithium-ion batteries. Currently, the most realistic option is to use lithium-sulfur batteries, but it is impossible for them to achieve industrial production within five or ten years.

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