The lithium-ion battery is the power source for most modern electric vehicles. Each battery is made up of many smaller units, called cells. The electrical current reaches these cells via conductive surfaces, including aluminum and copper. There is a positive electrode, the cathode, and a negative electrode, the anode. The battery is filled with a transport medium, the electrolyte, so the lithium ions carrying the battery’s charge can flow freely from one electrode to the other. This electrolyte solution needs to be extremely pure in order to ensure efficient charging and discharging.
Virtually every lithium ion cell produced today uses ethylene carbonate (EC), and most battery scientists believe it is essential. Petibon et al. (2016) tested electrolyte systems other than this within Li-Ion battery cells. Surprisingly, totally removing all ethylene carbonate from typical organic carbonate-based electrolytes and adding small amounts of electrolyte additives creates cells that are better than those containing ethylene carbonate. Petibon et al. (2016) used different surface coatings, electrolyte additives, and new solvent systems, and the impact was substantial. Continue reading →
An interesting article on the Clean Technica website, posted by Tina Casey on February 26th, discusses the development of the next generation’s low cost high capacity battery. A company called BioSolar is set to surpass the previous goal of $100 per kwh, set by researchers a few years prior, by achieving $54 per kwh. The company recently completed an international patent application by filling out applications for what they call a “multicomponent-approach to enhance stability and capacitance in polymer-hybrid supercapacitors.” [http://cleantechnica.com/2016/02/26/new-energy-storage-solution-could-hit-magic-54-mark/] Continue reading →
In an interesting article posted on The Guardian on February 5, 2016, blogger Steven Morris discusses the UK’s first home installation of a Tesla Powerwall by a company based in Port Talbot called Solar Plants. The Tesla Powerwall is a wall-mounted 7kWh or 10kWh lithium-ion-battery system that works by absorbing solar energy from exterior panels and then storing that energy for later use. It was first launched in California in May of 2015 with a price tag of $3000 or $3750 depending on the battery capacity. All orders sold out within the first 10 days and Tesla is now working on fulfilling backlog orders in 2016. They are also planning to release a second version of the Powerwall in July or August. Founder Elon Musk has not specified the details of the updates but has stated that the battery cells used in the updated model will come from the Gigafactory rather than their current dispenser, Panasonic. [http://www.fastcompany.com/3056330/fast-feed/tesla-will-launch-a-new-version-of-its-powerwall-battery-this-summer] Powerwall is not the first of its kind as there are other battery systems on the market, but its sleek, slim, and simple design makes it very attractive to consumers. According Mark Kerr, the owner of the Powerwall installed in this article, “its design is very sleek and minimalistic and something you can hang on the wall like a piece of art, definitely nothing like some of the other clunky looking batteries.” [http://www.theguardian.com/environment/2016/feb/05/welsh-home-installs-uks-first-tesla-powerwall-storage-battery] Continue reading →