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　　In order to promote and support the research and trial production of electric vehicles, the United States established the Advanced Battery Association (USABC) in the early 1990s to provide batteries for electric vehicles. The institution has invested 260 million US dollars to support the development of batteries for electric vehicles (mainly lithium-ion batteries), including 11.8 million US dollars in the development of lithium-ion batteries by SAFT Company in the United States, and 85 million US dollars in the development of lithium-ion batteries and lithium-polymer batteries by Quebec Company in Canada; In addition, $14.5 million has been invested in the development of lithium-ion batteries by Duracell and its partner Varta in Germany. The technical specifications are as follows: The Japanese government has also invested $100 million and developed a plan called LIBES to develop lithium-ion batteries for electric vehicles.

　　With the support of governments from various countries, electric vehicles with different performance have been unveiled one after another. Firstly, Sony Corporation of Japan launched an electric vehicle powered by lithium-ion batteries in 1995. The vehicle weighs 1.7T and carries 4 people. It can travel 200km/h on each charge, with a maximum speed of 120km/h. It only takes 12 seconds to accelerate from zero start to 80km/h; The power supply of this car is composed of 96 lithium-ion batteries with a size of 67 * 410mm and LiCoO2 as the positive electrode. Each battery has a capacity of 100Ah, and the specific energy of the entire power system reaches 110Wh/kg, with an energy density of 250Wh/l. Following Sony, Mitsubishi Corporation of Japan launched an electric vehicle in 1996, which uses lithium-ion batteries with LiMn 2O 4 as the positive electrode as the power supply, and can travel up to 250km at a time. Mitsubishi Heavy Industries, Honda Nissan and other electric vehicles have made their debut, and in early 1997, they officially sold electric vehicles powered by lithium-ion batteries. After Japan, some companies in the United States and Europe have also launched their own electric vehicles powered by lithium-ion batteries.

　　As a future means of transportation, electric vehicles will inevitably compete with the traditional means of transportation - fuel vehicles in terms of entering the market, which puts forward certain requirements on the price and performance of electric vehicles. As far as the performance of the vehicle is concerned, the driving range, acceleration performance, climbing ability, etc. of electric vehicles are more concerned, which largely depends on the performance of batteries as power. The requirements for battery performance generally focus on energy density, power density, cycle life, and other aspects, and the industry generally uses USABC's planning as a reference

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