China Drying Network News accounted for 97% of the global market for graphite-based lithium-ion battery anode material development encountered bottlenecks, in order to meet the downstream needs, the future development of lithium-ion negative electrode materials should diversify, mainly to high-performance (high specific capacity, high charge and discharge efficiency , high cycle) and high security, low cost development. At the 2012 China Lithium Anode Materials Seminar held in Qingdao on August 23-25, the participating experts put forward the above viewpoint.
Although lithium-ion graphite anode material is relatively mature, but is subject to structural characteristics, its specific capacity has reached the limit, can not meet the large-capacity battery required continuous high current discharge requirements. According to Chen Wei, general manager of Sedent Nanhua Investment Management (Shanghai) Co., Ltd. in China, many of the performances of lithium-ion batteries depend on the negative electrode materials, such as charge and discharge efficiency and lifespan. In the future, breakthroughs will be made in the development of new negative electrode materials. Important.
Dr. Xue Jiayu, an expert from the Beijing Institute of Low-Carbon Clean Energy, emphasized that the recent electric car accidents have caused the safety of the battery to become the focus of attention. In the future, anode materials should pay attention to high performance and high safety at the same time.
At present, composite materials formed of lithium titanate, hard carbon and other non-carbon anode materials, and various new anode materials such as silicon and tin have attracted attention.
Xue Jiayu pointed out that lithium titanate (LTO) is the representative of the emerging lithium battery cathode materials, the electrochemical potential of up to 1.5V, is the safest anode material. The cycle life of up to 20,000 times, 65 °C high temperature cycle to 8000 times. It is worth mentioning that, LTO generally does not generate solid electrolyte interface film, it is very conducive to high current discharge, can improve the battery cycle life and high and low temperature performance. Conventional batteries can only release 20% of energy at -20°C, while LTO materials can still release 40% of energy at -40°C, and large current discharges work well. If the LTO battery's specific capacity increases and the price drops, it will surpass the lithium iron phosphate battery, which is also the future technological development direction of the LTO negative electrode material. Chen Wei added that the raw material cost of lithium titanate is not high. To reduce the total cost, enterprises should make efforts in equipment, engineering, and quality control.
Xue Jiayu said that the life, power and safety of hard carbon materials are good. Its microporous structure is conducive to the movement of lithium ions, can quickly out of fast charge, is very favorable for power applications. However, hard carbon prices are high and applications are limited.
In addition, Xie Chengde, a research and development engineer at Hunan Morgan High-Tech Materials Co., Ltd., said that Helen has conducted composite research on graphite and materials such as silicon, tin, and bismuth, and that mature products will be introduced in the next year or two.
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