California-based company Ampirus has shipped the first batch of what it claims are the most energy-intensive lithium batteries available to date. These silicon anode cells hold 73 percent more energy than Tesla Model 3 cells by weight, and they take up 37 percent less volume.
The current Tesla Model 3 cells serve as a modern comparison and contain about 260 W / g / kg and 730 W / g / l, according to Enpower. The new Ampirus cells are a significant step forward in both specific energy and energy density, with 450W · g / kg and 1,150 W · g / l – and the company says an undisclosed number of elements has just been delivered to the industry leader. the new generation of high-altitude pseudo-satellites “give it the right to boast of” the highest energy density cells available today in the battery industry. “
Ampirus says the impressive performance of the batteries is due to their anode technology with silicon nanowire. When you charge a lithium-ion battery, you are actually distracting an electron from each lithium atom that happily sits on the cathode, and moving them to the anode through external wiring because electrons cannot pass through the electrolyte or separator between the anode and cathode. Their negative charge draws positively charged lithium ions through the electrolyte and separator, where each finds an electron and is embedded in what is usually a graphite lattice at the anode.
Ampirus replaced this graphite lattice with silicon nanowires. Silicon can store 10 times more lithium than graphite, but it tends to swell and crack, dramatically reducing the life of the element. Ampirus says that if you mold silicon into porous superconductors arranged in a forest of longer wires with shorter ones in between, silicon is able to tolerate swelling and resist cracks, extending cell life to a point where silicon anodes can become competitive technology.
The company says that silicon nanowires are embedded directly into the anode substrate, so the conductivity (and therefore power) is high. It says that the life of the cell is “excellent” and “constantly improving”, although it does not put any numbers, and also says that the anode is the only part of the battery that changes; the rest can be manufactured using existing manufacturing methods and components.
Obviously, the world is ready and looking forward to next-generation rechargeable batteries that can store more energy at smaller sizes and weights – everything from smartphones to electric cars will benefit from weight or space reduction, and new technologies such as VTOL electric planes are paying for batteries that can improve their range and capabilities.
And, of course, energy density and specific energy – these are just two indicators on which the battery should compete. Thermal performance, safety, charging / discharging speed and service life – all of this will play a big role, as will cost. The fact that the first customer of Ampirus is engaged in advanced aerospace and produces satellites, suggests that at the moment these cells are not going to compete on price.
Soon the company will choose a site on which to begin construction of mass production, which will provide economies of scale, which can make this technology relevant in the EV market and elsewhere. By the time the factory is up and running, we will also be able to supply some accurate performance figures for the other advanced electrode manufacturer we reported: Nawa Technologies says it is designed a method of cheap fabrication of vertically aligned electrodes from carbon nanotubes, arguing that this could lead to a 300 percent improvement in modern lithium batteries. We’ll see.
Amprius sends the first batch of batteries with the world’s highest density
Source link Amprius sends the first batch of batteries with the world’s highest density