Solid-state lithium battery is the future of lithium battery?
With the rise of electric vehicles, the top ten power battery companies have become the focus, and the research on lithium batteries has heated up again. In addition to meeting the requirements of long mileage and high-power charging and discharging, the safety of automotive power batteries is particularly important. Liquid lithium batteries are prone to spontaneous combustion and have low volumetric energy density. Currently, commercial lithium-ion batteries release a large amount of heat when short-circuited, which can ignite the organic electro-fluid and pose an explosion hazard.
Even Tesla vehicles, currently considered the safest vehicles, use complex battery management systems and safeguards, and are still experiencing multiple fires and explosions in just a few years. That's why scientists are trying to replace this organic electrolyte with a safer one for a more suitable operation. Thus, they revealed the use of electrolytes for solid-state lithium batteries.
What is a solid state battery
In a liquid battery, or organic battery, we use a liquid electrolyte to facilitate ion movement and a separator between the anode and cathode to prevent short-circuit accidents. In contrast, in solid-state batteries, a solid electrolyte is used instead of a liquid electrolyte and separator. It works well at low and high temperatures (-73°C to 120°C), while organic electrolytes are limited (about 60°C). Its electrolyte is solid, and its density and structure allow more charged ions to gather at one end, conduct greater current, and increase battery capacity.
Therefore, for the same amount of power, solid-state batteries will become smaller. Not only that, but storage will be easier since there is no electrolyte in solid-state batteries. When used on large equipment such as automobiles, there is no need to add additional cooling pipes, electronic controls, etc., which not only saves costs, but also effectively reduces weight. Therefore, many battery manufacturers have begun to develop solid-state batteries, and solid-state batteries are about to come out, and commercial use is imminent.
What is a solid state lithium battery
When lithium ions are transported between the positive and negative electrodes throughout the solid film, it is called a solid-state lithium battery. In this type of battery, lithium ions stored in the cathode electrode move to the anode portion during charging. That is to say, during the charging process, Li+ is released from the positive electrode film and undergoes a reduction reaction in the negative electrode film through the electrolyte; the discharge process is the opposite.
Could solid-state lithium batteries be possible?
Yes, for the sake of safety, scientists have made a lot of efforts to accelerate the popularization of solid-state lithium batteries in the near future. A major challenge for commercialization is the low ionic conductivity of solid electrolytes compared to liquid electrolytes.
However, solid-state batteries have the characteristics of high energy density, high temperature resistance, non-volatility, non-corrosion, and small size, which avoid the main weaknesses of traditional liquid lithium batteries. In recent years, the capacity of solid-state lithium batteries has increased, approaching that of traditional liquid electrolytes. Therefore, it is expected that membranes will start to replace organic electrolytes in the market in a few years.
How long will it take for solid-state batteries to hit the market?
Fethium and its investments have kick-started mass production of solid-state lithium batteries; however, there are still some challenges that need to be addressed before this step can be taken. The main problems are that the electrolyte of the solid electrolyte is sensitive to air, poor solid interface contact, and poor stability.
The second problem is that the manufacturing process is complicated, the production process is immature, and the output of finished products cannot be guaranteed. In addition, the cost of solid-state batteries is very high and very expensive. Therefore, mass production in the market becomes more difficult.
What are the advantages and disadvantages of solid-state batteries
Based on the above, solid-state batteries have many advantages and disadvantages. The advantage of a solid-state lithium battery is that it offers greater safety because it does not contain a flammable electrolyte. In addition, the solid film can prevent the short circuit between anode and cathode caused by lithium dendrites. Additional benefits compared to liquids are light weight, high safety, high energy density, strong cycling performance, and short charging times. Here you can refer to the top ten cathode material manufacturers of cathode material manufacturers.
Here, lithium metal anode material is one of the most important anode materials for all-solid-state lithium batteries due to its high capacity and low potential, and in commercial lithium batteries it is graphite. Another advantage is that solid-state batteries charge six times faster than conventional lithium-ion batteries.
Despite these advantages, solid-state batteries still suffer from serious weaknesses, such as volume expansion during charging and discharging due to the use of lithium metal as the anode. Membranes are still expensive and complex to manufacture. In addition, the life of the battery is still short compared to the liquid type due to poor contact between all the solid parts of the battery resulting in excessive interfacial impedance.
What materials are used in solid-state batteries
Solid batteries have the same configuration as liquid types, but the liquid electrolyte and separator are replaced by a solid membrane. Usually in solid-state lithium batteries, solid-state lithium battery technology uses glass compounds made of lithium, sodium, etc. as conductive substances, the anode is lithium metal, and the cathode is lithium materials such as lithium. In the case of a solid electrolyte, it is made of ceramic or polymer materials that allow the transport of lithium ions during charge and discharge, like lithium lanthanum zirconium oxide. However, this material required some modifications to provide battery performance.
Does Tesla have solid state batteries?
Tesla unveiled its aircraft to demonstrate a solid-state battery prototype in an electric vehicle in 2025. According to official sources from the owner, the battery will be able to recycle and extract heavy metals for greater sustainability. The fast charging speed and light weight of solid-state lithium batteries have encouraged automakers to move in this direction and invest more. In addition to Tesla, many lithium-ion battery manufacturers also plan to use solid-state batteries, you can read the top ten solid-state battery companies to learn more.
Will solid-state batteries replace lithium-ion?
All those in the field of batteries are expected to use solid batteries instead of Li-ion batteries (liquid) for absolute safety and energy density purposes. Extensive research has been conducted to improve battery lifetime and capacity while maintaining chemical and thermal stability. To avoid volume changes in lithium metal anodes, other materials are being tested and improved to provide mechanical stability.
Do solid-state batteries use separators?
In fact, the solid electrolyte does two things, it facilitates ion transfer and separates between anode and cathode to avoid short-circuit problems. Therefore, the solid film should be strong enough to avoid lithium dendrites and chemically stable enough not to dissolve. In addition, solid-state lithium batteries should have high ionic conductivity for large-scale applications.
Are solid-state lithium-ion batteries better than other batteries?
There are many factors that should be considered when choosing a battery type. Compared with other batteries, solid-state lithium batteries have the highest safety, robustness and flexibility because they contain less flammable materials and do not leak. However, it still has serious problems such as high cost, low storage power, and short lifespan. All these issues hinder the commercialization of solid-state batteries. But the scientists aim to further increase the energy density by using alternative, less expensive materials in the near future.
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