Explain the history of lithium batteries

The history of lithium batteries is summarized. In the early design of lithium batteries, researchers mainly considered the design from the positive electrode, negative electrode, and electrolyte. According to the combination of materials, there are a total of 110 million combinations, and there are only more than 30 practical applications, less than 30PPM, which makes us wonder why there are so few combinations that can be industrialized. Researchers have found that packing the active material into a container with positive and negative electrodes is a big problem. In the early stage, researchers found that lithium secondary batteries and nickel-hydrogen batteries can achieve energy storage and transfer, but the hydrogen storage alloy is too heavy, and lithium secondary batteries will form lithium dendrites due to the charging and discharging process, and they are easy to burn. In response to the current difficulties, the researchers put forward various ideas and reviewed the materials. Such as alloy: AL, wood alloy (bi50%, pb26.7%, sn13.3%, cd10%mp70℃), carbon and other materials. After a series of investigations, people found that the AL cycle is not good, wood alloy CD Wuhan environment, and C is a better choice, but C/Li alloy is difficult to manufacture in the industry. According to the characteristics of the battery, it means the positive electrode material of the battery: if the positive electrode contains Li, Li can go in and out freely. In the early days, a battery of Sony used silver oxide AgNiO2, which was layered and relatively easy to deintercalate Ag. The principle was the same as that of the patented product LiNiO2/LiCoO2 at the time, but lithium was used as the negative electrode. Taking LiCoO2 as an example, the important principle is as follows: The positive electrode LiCoO2, in order to maintain neutrality, has the same amount of electrons and lithium ions. During charging, lithium ions are separated from the positive electrode material, pass through the electrolyte and membrane, and reach the negative electrode. The negative electrode remains neutral, and the same amount of electrons flow from the external circuit to the negative electrode. In the opposite case, lithium ions flow from the negative electrode to the positive electrode, and current flows from the external circuit to the positive electrode. Researchers have conducted a series of explorations based on the characteristics of batteries and customer needs. Many ideas have been industrialized and accepted by most consumers. In order to improve the safety of lithium batteries, we should consider several aspects. 1. Small short circuit; 2. Uneven electrodes (such as uneven surface density of the coating); 3. How to better match the positive and negative electrodes in a larger area; 4. How to conduct safety tests, especially for the Yuelai The bigger the battery; 5. Whether the soft pack battery is easy to dissipate heat and how to conduct heat dissipation management. Conclusion Although the development of the industry faces many difficulties, we firmly believe that only by continuous learning can we achieve brilliant results. In the development, processing and application of new energy vehicle batteries, it is necessary to continuously deepen intra-industry exchanges. Only cooperation can achieve a win-win situation. 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.