Semi-solid lithium ion battery – What are the improvements for batteries?
Solid state batteries are a hot topic in the new energy industry. News about the mass production and release of solid-state batteries in 2024 constantly stirs the nerves of industry practitioners.
In fact, what can be confirmed at present is that the mass-produced batteries on the market are all semi-solid state batteries, and all solid state ev batteries are still in the laboratory stage. This article will discuss the relevant information of semi-solid lithium ion battery, in order to provide you with a better understanding of battery related information and to obtain more information as an additional reference when purchasing.
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Definition of semi-solid lithium ion battery
The classification of solid-state batteries is as follows, which can be classified according to the different electrolyte forms and electrolyte materials. According to electrolyte morphology classification:
All solid state battery: completely using solid electrolyte instead of electrolyte, without any liquid electrolyte.
Semi solid state battery: The electrolyte adopts a solid-liquid mixed form, and the liquid battery electrolyte accounts for about 5-10% by mass.
From the classification of solid-state batteries, it can be seen that semi-solid and quasi solid state batteries still contain electrolyte, but the content is lower compared to liquid lithium-ion batteries. Energy density of a battery in semi solid state is higher than liquid state battery by optimizing electrode materials and structural design, meeting the needs of most applications.
Improvements of semi-solid lithium ion battery
The transition from liquid batteries to solid-state batteries is a major trend in the long-term development of battery technology. The main reasons for promoting this transformation are safety and energy density. We believe that when car companies replace liquid batteries with solid-state batteries, safety is the short-term driving factor and energy density is the medium – to long-term driving factor.
Compared with liquid state batteries, the biggest feature of semi-solid state batteries is the introduction of solid electrolytes. To replace the existing battery structure of electrolyte and separator.
The use of solid electrolytes makes the interior of the battery more compact, reducing the risk of liquid electrolyte leakage. The high stability of solid electrolytes further improves the safety of batteries and reduces the possibility of combustion accidents during use, which actually solves the problem of lithium batteries being prone to “spontaneous combustion”.
Due to the addition of solid electrolytes, batteries can store more energy in the same volume, thereby improving the endurance of cars.
The market of semi-solid lithium ion battery
At present, all solid state batteries are mainly in the research and development and trial production stage worldwide. The main limitations that restrict the industrialization of all solid state batteries are that the material technology preparation technology is not mature enough and the production cost is too high. The industry generally believes that the large-scale industrialization node of all solid state batteries will be around 2030.
Before all solid state batteries officially enter the commercialization stage, semi-solid state batteries are an ideal transitional technology solution. The semi-solid lithium ion battery material system has less variation compared to liquid batteries, and the overlap between process equipment and liquid batteries is higher. It can inherit the existing mature industrial chain and is expected to be the first to achieve industrialization. Currently, many domestic enterprises choose semi-solid state batteries as transitional products.
Semi solid state batteries also have a trend of becoming the new favorite in the market. But currently, the influence of semi-solid lithium ion battery is not strong.
One reason is that many car models equipped with semi-solid state batteries promote them under the name of solid-state batteries, which can easily cause resentment. Secondly, early models equipped with semi-solid batteries did not perform outstandingly and did not trigger a market trend.
Battery used in electric vehicle taking NIO ET7 as an example, its energy densities are said to have reached 360Wh/kg respectively, which can be said to have achieved certain technological breakthroughs. However, compared to the current high nickel ternary battery with a single energy density of 280Wh/kg, it has only increased by 10% -20%. At present, the advantages of semi-solid state batteries are not obvious in achieving the 1000 kilometer range goal of pure electric vehicles.
How to choose semi-solid lithium ion battery
According to industry insiders, based on the semi solid state battery that have been announced for mass production, their yield rate is only about 80%, far lower than the 98% level of traditional lithium batteries.
Therefore, when choosing a semi-solid lithium ion battery, the following points can be considered.
We need to consider the energy density of the battery. The energy density determines the energy storage capacity of a battery, usually measured by the amount of energy stored per unit volume or unit mass.
Charging speed is also one of the considerations when choosing a semi-solid lithium ion battery. Compared with traditional lithium-ion batteries, semi-solid state batteries have a faster charging rate, which means we can obtain sufficient power faster and no longer need to wait for the battery to fully charge for a long time.
In addition, safety is also an important factor to consider when choosing semi-solid batteries. Semi solid state batteries use solid electrolytes instead of liquid electrolytes, effectively reducing the risk of explosion and combustion and providing a safer and more reliable operating environment. Therefore, when considering purchasing a semi-solid lithium ion battery, we should choose products that have undergone rigorous testing and certification.
In addition, we also need to pay attention to the cost-effectiveness of batteries. Although semi-solid batteries have more advantages compared to traditional batteries, the price may be slightly higher. Therefore, we need to weigh factors such as performance, quality, and price to choose the battery that suits our needs.
Finally, we can also consider the brand and reputation of the battery. Choosing well-known brands of semi-solid lithium ion battery not only ensures high quality, but also provides more reliable after-sales service. In addition, we can also understand the user experience and satisfaction with the brand’s batteries by reviewing their reviews and feedback.
Conclusion
From the development status of the battery industry, it is almost impossible to launch a perfect solution at a certain point in time. Instead, it is necessary to continuously improve manufacturing capabilities, material properties, and cost-effectiveness in combination with market conditions in order to achieve more long-term goals.
The industry should provide more development space for semi-solid lithium ion battery, allowing more consumers to understand the advantages of semi-solid battery and promoting the healthy development of the entire industry.
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