Lithium titanate: the ill-fated first generation of quick-charge batteries
Under this background, micromacro enters the “quick charging stage”. “” in 2010, we launched the LpTO lithium titanate battery, officially launched the quick charge technology route and applied in chongqing bus.” ” “For the fixed line between A and B, the quick charge operation mode is to set charging station at point A or A and B simultaneously. The battery capacity of the vehicle does not need to be large, and the fast charge can be used to meet the normal operation,” song explained.
As far as we know, lithium titanate is not a new thing, and has been doing preliminary research and development since the 1990s. “Lithium titanate, as a negative electrode material, has excellent life and quick charging characteristics, but it is easy to react with electrolyte, producing gas that leads to the swelling of the battery, which greatly affects the battery life. We have modified the lithium titanate material, preventing the reaction of the active level of the material and electrolyte, basically eliminating the generation of gas expansion and realizing the industrialization. Song Han said.
Lithium titanate has obvious characteristics, it can be charged quickly and has long cycle life. “Our 31 vehicles in chongqing have been running for nearly four years, and the battery decay is still not obvious from the test results. However, if we use other slow rechargeable battery systems, we need to replace the batteries in about two years, which is the additional investment cost.” He said.
Multiple compound: the second generation of quick rechargeable batteries spawned by policy changes
However, the sudden change in national policy has led to the “extinction” of the promising lithium titanate. In September 2013, the state introduced new new energy vehicles subsidies (i.e., “about to carry out the work of new energy automobile application notice), which regulates, for super capacitor, lithium titanate fast filling pure electric bus quota subsidies of 150000 yuan, after the new energy vehicles subsidies standards are all pure electric bus can enjoy subsidies of $500000. The subsidy plunged by 350,000 yuan, which made weihong realize that the advantage of lithium titanate is no longer, and launched the second generation of rapid charge battery, namely LpCO multiple composite lithium battery in October 2013.
“Ordinary batteries use graphite, but ordinary graphite is limited to the material structure and cannot support rapid charge. The key technology of multiple composite lithium battery is that porous composite carbon material is used in the negative pole. Porous carbon composite treated the surface on the basis of graphite, and increased the migration channel of lithium ions. This is our innovative technology. The increase of lithium ion migration channel enables the rapid charging of the battery. “According to the operating demand of the bus, the multiple combination increases the energy density (up to 120~140 watt-hour/kg), guarantees quick charging (up to full within 15 minutes), and the charging times reach about 10,000 times. In theory, the battery does not need to be replaced during the life of the vehicle. More attractive, the cost of the multiple composite battery is 30-40% lower than lithium titanate.