The reporter learned from the Kodak Institute of Coal Chemistry on the 15th that a special carbon anode material for high-capacity and high-density lithium batteries with pure carbon as the main component was introduced in the hospital. At present, new lithium-ion batteries for electric vehicles based on this material Official trial production in Chengdu Nanguang New Energy Company.

It is understood that in the power system of new energy electric vehicles, the capacity of lithium batteries (that is, the energy density of battery cells) depends entirely on the composition of the negative electrode materials of lithium ion batteries. Dr. Liu Changguo, the inventor of China's first new energy vehicle lithium battery and chief engineer of Chengdu Nanguang New Energy Company, said that since the localization of lithium batteries, the anode material has always used natural graphite as the main component, with long charging time and low monomer capacity density. Technical bottlenecks make it difficult for China's new energy vehicles to break the 300km range. From the experimental data and product performance tests, this lithium battery made of new materials can achieve a cruising range of more than 600 kilometers.

He Feng, the technical inventor and general manager of Yulin Keda Coal Chemical Research Institute Co., Ltd., introduced that the energy storage material of the new single cell has abandoned the traditional natural graphite in research and development, and made pure carbon into high carbon through physical and chemical methods. High-density lithium battery negative electrode material.

Experiments show that the gram capacity of this new negative electrode material can reach 2200mAh / g, the compact density of the negative electrode sheet exceeds 2.0g / cm3, and the ternary material for the positive electrode plus lithium cobalt oxide, the mass energy density of the lithium battery can exceed 350Wh / kg. "In addition, the charging time of lithium batteries based on new materials does not exceed 15 minutes, which is beyond the reach of traditional batteries. After testing, the temperature of new material batteries during charging and use is always normal." He Feng said.

Liu Changguo said that domestic experts in the field of new energy power batteries have expressed concern about whether domestic lithium batteries can achieve a single energy density of 350Wh / kg in 2020, and the new batteries in trial production have exceeded this goal. (Reporter Zhang Jingyang)

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