The emergence of power lithium-ion batteries has made new energy and clean energy an inevitable trend. Battery technology is developing towards new materials and clean energy, and has made significant breakthroughs. However, there are few commercial applications. The main reason is that it cannot deliver on the promise of low cost and high capacity. Therefore, current research on batteries for electric vehicles is still focused on lithium-ion batteries, followed by lead-acid batteries, nickel-metal hydride batteries and sodium batteries. These two types of batteries rank first and second in the number of patent applications for electric vehicle batteries and their management systems.
The close collaboration between Tesla and Panasonic, in particular, demonstrates that they didn't deliberately change the battery materials—they still use lithium-ion batteries. By simply improving efficiency and refining production, they were able to optimize the battery to meet the specific needs of automobiles. This illustrates that close integration of manufacturing and engineering technology is a viable path to the commercialization of battery technology. However, the room for improvement in lithium-ion batteries is limited, production costs are high, and the use and recycling of lithium-ion batteries cause environmental pollution. Furthermore, the uneven distribution of lithium mines means that even if all electric vehicles use lithium-ion batteries, they will still be subject to dependence on lithium-producing countries, a situation strikingly similar to that of gasoline-powered vehicles.
Since the beginning of the 21st century, many countries have begun to formulate medium- and long-term solar energy development plans, such as the National Photovoltaic Program, Japan's Sunshine Program, and my country's western provinces' electrification plan for rural areas without electricity. Solar energy application technologies will gradually deepen in five areas: monocrystalline silicon and devices, thin-film photovoltaic technology, PVMat, photovoltaic modules and system performance and engineering, photovoltaic applications and market development.
As a result, solar cell technology has made significant progress. One aspect is the advancement of silicon solar cells, which are divided into three types: monocrystalline silicon solar cells, polycrystalline silicon thin-film solar cells, and amorphous silicon thin-film solar cells. Currently, monocrystalline silicon solar cell technology is mature, but due to its high cost, it will gradually be replaced by polycrystalline silicon thin-film solar cells. However, amorphous silicon thin-film solar cells are still the most promising. Secondly, nanocrystalline solar cells are gradually coming into view. They achieve stable performance with extremely low manufacturing costs and simple processes. Their manufacturing cost is only 1/5 to 1/10 of that of silicon solar cells, and their lifespan can reach more than 20 years.
