New solid-state lithium-ion battery: self-contained overcharge function charge and discharge 120 capacity loss 2%

Автор: Iflowpower – Kannettavien voimalaitosten toimittaja

New chemical methods are expected to overcome lithium-air battery defects. Under the same weight, the lithium-air battery can supply more power, so it is widely used in electric vehicles and other mobile electronic devices. However, there are many disadvantages of lithium-air battery: high heat generation (large amounts of chemical can be converted into thermal energy without supplying to equipment), short life, is expensive and complex, and is complex to the battery.

very troublesome). Recently, Li Ju, Professor of Nuclear Engineering, Massachusetts Institute of Technology, Zhu Zhi (transliteration, zhizhu) and other five work in Massachusetts Institute of Technology, Algun National Laboratory and Peking University Author in "Natural Energy" journal, report A new technique called "nano-lithium cathode" can be used to make performance and lithium-air batteries in which a closed lithium ion battery is similar to overcome the above problems. Li Ju said that one of the weaknesses of the lithium-air battery is that the charging and discharge voltage are not equal, the discharge voltage is 1.

2 volts than the charging voltage, so during each charging process, the energy of the thermal energy is as high as 30%. "If you charge too fast, your lithium-ion battery is really possible to burn. "When the gas locates the traditional lithium-air battery, chemical reaction is chemically reacted with the lithium in the battery.

At the time of charging, the oxygen in the lithium oxide is released into the atmosphere. The new nano-lithium cathode battery also utilizes the use of oxygen elements and lithium. Difference is that when discharges, oxygen will not be released in the form of gas, but is blocked in the solid.

Specifically, oxygen is enclosed in three solid compounds in three solid compounds in three kinds of oxidation, and these three substances are wrapped in cobalt dioxide glass. The advantage of this is that the voltage difference of the nano-lithium cathode battery will decrease by 5 times - from 1.2 volts to 0.

24 volts, so only 8% of energy is lost in thermal energy. This means that you can charge the car battery with faster speed and don't worry about overheating. The second disadvantage of the lithium-air battery is that the oxygen released in the form of gas disrupts the ion channel in the battery, thus reducing the life of the lithium ion battery.

New technology uses cobalt dioxide glass to wrap lithium and oxygen in the nanometer-scale space, scientists refer to this structure as nano. In this way, the transformation of LiO2, Li2O2, and Li2O does not change the macro structure of the material. In addition, since the nano-lithium particles itself are very unstable, the glass can be stabilized in the nanotic cobalt oxide.

Cobalt dioxide also plays a role of catalyst in charge and discharge. Li Ju said that traditional lithium-air battery is actually only a lithium-oxygen battery because water vapor and carbon dioxide in the air will have a side reaction with lithium, so the lithium-air battery must be equipped with a huge auxiliary system to remove water vapor And carbon dioxide, this is a very difficult step. And the new solid lithium-ion battery has no this problem.

Since the new anti-pre-charge function, the solid lithium-ion battery is also self-charged because the chemical reactivity in the battery will be adjusted by negative feedback. When the electrical is filled, the reaction is automatically stopped. If the traditional battery is overcharge, it will cause irreversible damage to the battery, and even explosion.

However, the solid lithium ion battery continues to charge for 15 days in the experiment, and the charge power is 100 times the battery capacity, but the battery is not damaged. In charge and discharge experiment, the solid lithium-ion battery charge and discharge 120 times, the capacity is only 2%, which means far exceeding the life of traditional lithium-air batteries. Since the solid lithium ion battery does not need to assist air purification systems, it can be easily applied to electric cars, and even a power grid-level energy storage station.

Since the solid oxygen cathode is much larger than the cathode of the lithium ion battery, the new solid lithium ion battery can store more than one-fold amount than the same weight of lithium ion battery. With the improvement of technology, the power of new batteries can be doubled. The greater advantage of new batteries is that it does not need to use expensive rare materials.

The carbonate electrolyte of the battery is very cheap. In addition, the cobalt dioxide glass is 50% lightly 50%. Therefore, compared with lithium-air batteries, the new battery is very cheap, safe, and has a large-scale application potential.

Research team plans to complete the manufacture of practical prototypes in 1 year. Qi Xu Lei (transliteration, Xiuleiji), an associate professor of Oregon State University, said that the performance of new lithium-ion battery technology is more important than traditional lithium-air batteries. The superoxide solute is well working in the carbonate dielectric, completely eliminating the intervention of oxygen.

During the charge and discharge process, the cathode material is solid, so the installation and use of new batteries is very convenient.