Tesla hat ein neues Patent für eine NCA-Elektrode beantragt, die günstiger als bisherige Batterien sein soll und gleichzeitig eine höhere Energiediche bieten soll. Spannend!
The new battery tested is a Li-Ion battery cell with a next-generation “single crystal” NMC 532 cathode and a new advanced electrolyte, which they patented. They were able to show over 4,000 cycles in the battery cells made with the novel cathode. Now Tesla is patenting “single crystal” NCA electrodes as disclosed in a recently published patent application called ‘Method for Synthesizing Nickel-Cobalt-Aluminum Electrodes’. New studies by the inventors have identified a two-step synthesis process for preparing single crystal nickel-cobalt-aluminum electrodes. In certain embodiments, the two step synthesis process includes two lithiation steps. In the first lithiation step, in order to avoid forming Li5Al04 at high sintering temperature, precursors with Li/OM ratios of less than 1.0 (e.g. Li/OM=0.6, 0.8, 0.9, 0.95) are lithiated at higher sintering temperature, such as 800°C to 950°C. This sintering step might take between 1 hour to 24 hours depending on the temperature selected, the furnace configuration used and the final crystallite size desired. In the first lithiation step, Li(i-X)[Nio.88Coo.o9Alo.o3](i+x)02 is obtained. In the second lithiation step, in order to compensate for the lithium deficiency, the material is sintered with more LiOHTUO at standard NCA lithiation temperature (approximately 650 to 760°C) for approximately 12 hours. This sintering step might take between 1 hour to 24 hours depending on the temperature selected and the furnace configuration used. The amount of added LiOHTLO in the second lithiation step is determined by overall target of the Li/OM ratio in the final product. In some embodiments, in the first lithiation step if a Li/OM ratio of “b” is selected, then in the second lithiation step a further additional Li/OM ratio of“1.0 -b,”“1.01 – b”,“1.02 – b”, 1.03 – b”, etc. is selected depending on the amount of lithium loss anticipated in both the first and second lithiation steps. In other words, the sum of the Li/OM ratio in the first lithiation step and the Li/OM ratio in the second lithiation step is 1.0, 1.01, 1.02, or 1.03. In some embodiments, the goal is to make a final product with a Li/OM ratio very near 1.00 and with very little Ni atoms in the Li layer of the material (less than 2%).