Five major cathode materials and important indicators of lithium batteries for electric vehicles

Without a perfect battery, automakers plan battery packs to make up for the lack of performance. Therefore, battery manufacturers generally plan batteries according to order requirements and strengthen the important characteristics required during use. The following are some important policies for batteries in power systems. Safety: It is one of the most important policies for choosing electric vehicle batteries. An accident and expanded speech in the media may lead to public rejection of electric vehicles. Similar problems occurred 100 years ago, such as steam engines and fuel tank explosions. The first problem is that the battery is out of control. With Anjing's accessories and well-designed safety circuits, the problem should be basically solved, but there are still risks. The safety of the battery after long-term use and misuse should be ensured. Life: Reflect the cycle time and storage life of the battery. The battery life of most electric vehicles guarantees that they can travel 160 kilometers (about 100 miles) on a single charge within 8-10 years of use. Battery capacity degradation caused by battery aging is a serious problem (especially in hot weather conditions). On the other hand, car manufacturers lack battery aging data for users under different conditions and climates. Therefore, manufacturers usually add battery pack specifications to make up for the loss of battery capacity, so as to ensure that the car can be used normally for a fixed period of time. High and low temperature function of the battery: It reflects the function of the battery in extremely hot summer and extremely low temperature. Unlike the internal combustion engine, the battery of an electric car has a higher temperature. When the power source of the car is only the battery, the temperature of the battery and the energy required for internal heating and cooling will also come from the battery. Specific energy: The energy contained in the unit weight of the battery, reflecting the feasible stroke of the car. As we all know, the energy per unit weight of the battery is only 1% of the fossil fuel. The capacity of 1 kg (1.4l 0.37 gallons) of gasoline is approximately 12 kWh, while the capacity of a 1 kg battery is only 120 watt-hours. But what we need to know is that the engine power exceeds 90%, while the internal combustion engine power is only about 30%. Although the power difference is so large, if the energy storage capacity of the battery cannot be increased by 2 to 4 times, it is unlikely to be confused with the internal combustion engine. Specific power: For talents related to the acceleration of cars, the specific power of most electric vehicles is not low. Compared with an internal combustion engine of the same horsepower, an electric motor has a better torque ratio. Cost: This is the first disadvantage of electric vehicles. The Boston Consulting Group believes that the battery policy cost is difficult to control at 250-400 US dollars/kWh. In addition, there are other factors that will increase costs, such as conventional safety protection circuits, battery operating conditions, compliance with environmental temperature control, and a warranty period of 8-10 years. These factors cause the price of batteries to be comparable to that of non-electric vehicles, which is actually twice the price of electric vehicles. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it. Previous: Should I 'eat less and eat more' for lithium batteries or charge them overnight?