Germany launches EV lithium battery with ultra-high cycle life
The German Institute of Solar Energy and Hydrogen Energy recently developed a high-cycle-life lithium battery that can be used in electric vehicles. The power density of this lithium battery is 1,100 watts/kg.
Researchers have produced samples of new lithium batteries based on 18650 batteries. Careful people may find that 18650 batteries are also used in Tesla Model S cars. New lithium battery technology also provides major manufacturers with the basis for manufacturing large-sized and prismatic battery cells.
In experiments, the capacity of the new lithium battery can maintain more than 85% of its original capacity after 10,000 charge and discharge cycles under 2C discharge rate conditions. This feature will be very suitable for electric vehicle applications. Lithium batteries for automobiles are required to have a capacity value of no less than 80% of the original value after 10 years of operation.
Researchers pointed out that the manufacturing of lithium battery electrodes is based on a series of complex processes and is affected by multiple factors. Adjusting the electrode size to an appropriate size can greatly improve the electrochemical performance and battery energy density. Research shows that in LiNi0.8Co0.15Al0.05O2 electrode materials, electrode thickness, compaction, conductive agent type and mixing ratio have a great impact on electrochemical performance, especially in high discharge ratio environments.
The reaction reaches dynamic equilibrium when the speed at which the metal becomes a cation enters the solution and the metal ions in the solution deposit onto the metal surface are equal. That is, the material migration and charge transport speeds of the forward and reverse processes are the same, that is, the material migration and charge transport speeds of the forward and reverse processes are the same, that is, there is a constant potential value on the electrode. At this time, the charges and substances in the forward and reverse processes of the electrode reaction have reached balance.
The new electrode must be adjusted to reach a balanced state, otherwise it will cause excessive lithium ions to be deposited on the electrode surface. The size of the anode will also increase to avoid lithium ion deposition. When the particle size on the electrode is too large, it will lead to a loss of battery energy density.
In the next phase, the researchers will develop large-scale prismatic lithium batteries.
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