Energy density is three times more than the current lithium batteries, and the safety is higher, What type of this lithium battery is ? The battery industry named it “new whole solid batteries”.
Whole solid lithium battery in the energy density, safety and flexibility have a leap-style upgrade, which makes it unanimously optimistic about the industry, and in recent years spread the major corporate solid battery news, industrialization can be expected.
Whole solid-state battery energy density theoretically is very high, but the current engineering capacity is not enough.The package is in the range of the 100-200wh / kg, which is a lot of room for improvement. To achieve whole-solid-state battery large-scale industrialization,we need get start from the following aspects:
- To determine one or several mature production process, improve the scale effect, reduce the use of cost.
- To formate standardized products, improve production efficiency and yield.
- To find the appropriate material system in order to solve the problem of low output energy density and lithium dendrite.
At present there are major cars makers and battery manufactories have started to study and layout of solid battery R & D and production. Let’s see who they are.
According to reports, the Hyundai independently researches and develops solid batteries for their electric vehicles. Hyundai has established pilot production facilities. Someone of Industry told reporters: “Hyundai is through the Nanyang R & D Center (Namyang R & D Center) under the battery research and development team of solid battery research and development, has achieved a certain level of technology.”
According to media reports, BMW is expected to achieve solid battery breakthrough in 2026 and then mass production, the battery using solid electrolyte to replace the existing electrolyte, lighter, more secure, more efficient, will be applied to its main mix, Electric vehicle type. This new battery will use solid electrolyte instead of the current lithium-ion battery commonly used electrolyte, this change can bring multiple benefits for the battery pack, such as lighter, lower risk of collision fire, while the battery capacity will be 15% 20% improvement. However, foreign media said that this solid-state electrolyte battery is still unable to mass production because it is exposed in the test of long-term use of poor reliability problems, and thus the current state can not be mass production, the future is expected to formal Production needs to wait until 2026 to achieve.
Sulfide solid electrolyte is an important research and development direction for CATL. For the sulfur-based whole solid batteries,both the interface of positive and negative have a problem of interface reaction. For the problem of positive interface, it could be solved by the way of the positive coating, and the negative interface could be formed on the surface of lithium metal layer of a stable buffer layer.
In practical applications, sulfide also exists the problem in contact with ionic conductivity, poor stability of contacting with air and water. It’s release of highly toxic hydrogen sulfide gas, that is smelly. The human beings in the can will not bear this.
The guy in the company said they are using hot-pressing way to improve the interface to improve the overall ion conductivity of the battery system, and the improvement of the sulfide material research to improve its stability.
Even if the prospects of solid batteries are infinitely optimistic and even if the major companies have layout, and industrialization can be expected, we still need to be calm down to it. At present, the industry has a consensus, that now talk about whole solid lithium battery industry is still too early. Although solid lithium ion battery technology has been existed long ago, but to achieve industrialization and replace the traditional lithium-ion battery still needs a long process. In the next 5-10 years, lithium-ion battery will remain the mainstream route.