-Which is better, graphene battery or lead-acid battery?

Which is better, graphene battery or lead-acid battery?
author:enerbyte source:本站 click131 Release date: 2024-06-17 08:37:00
abstract:
Graphene batteryGraphene battery is a new energy battery developed by utilizing the rapid and massive shuttle motion of lithium ions between the graphene surface and electrodes. Nanotek Instruments, based in Ohio, USA, has developed a new battery by utilizing the rapid and massive shuttle motion of...

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Graphene battery

Graphene battery is a new energy battery developed by utilizing the rapid and massive shuttle motion of lithium ions between the graphene surface and electrodes. Nanotek Instruments, based in Ohio, USA, has developed a new battery by utilizing the rapid and massive shuttle motion of lithium ions between graphene surfaces and electrodes.

The success of the experimental stage of the new graphene battery will undoubtedly become a new development point in the battery industry. Battery technology is the biggest threshold for the vigorous promotion and development of electric vehicles, and the battery industry is currently facing bottlenecks in the development of lead-acid batteries and traditional lithium batteries. After the successful development of graphene energy storage equipment, if it can be mass-produced, it will bring new changes to the battery industry and even the electric vehicle industry.

Due to its unique characteristics, graphene is known as a "magical material", and scientists even predict that it will "completely change the 21st century". Professor Colin Bailey, Vice President of the University of Manchester, said: "Graphene has the potential to revolutionize a large number of applications, from smart phones and ultra high-speed broadband to drug delivery and computer chips."

Lead-acid battery

Lead acid battery (VRLA) is a type of battery where the electrodes are mainly made of lead and its oxides, and the electrolyte is a sulfuric acid solution. In the discharge state of lead-acid batteries, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; In the charging state, the main component of the positive and negative electrodes is lead sulfate. The nominal voltage of a single cell lead-acid battery is 2.0V, which can discharge up to 1.5V and charge up to 2.4V; In applications, six single cell lead-acid batteries are often connected in series to form lead-acid batteries with a nominal voltage of 12V, as well as 24V, 36V, 48V, etc.

When it comes to electric vehicle batteries, most people are familiar with these three types of batteries: lead-acid batteries, lithium batteries, and recently popular graphene batteries. So, what kind of battery do you think electric vehicles will choose in the future when the new national standard is officially implemented? For this question, let's first take a look at the characteristics of each type of battery.

Lead acid batteries mainly consist of tubular positive electrode plate, negative electrode plate, electrolyte, separator, battery compartment, battery cover, pole, and liquid injection cover. The electrode is composed of lead and lead oxide, and the electrolyte is an aqueous solution of sulfuric acid. The main advantages are stable voltage and low price, but the disadvantages are low specific energy, relatively short service life, and the need for frequent maintenance. It is undeniable that in the current market, lead-acid batteries dominate.

Generally speaking, lithium-ion batteries mainly consist of four components: positive electrode, negative electrode, separator, and electrolyte. Positive electrode materials are generally layered compounds rich in lithium. Currently, common commercial positive electrode materials include lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4), and ternary materials (LiMnxCo1-x-yNiyO2). Compared with lead-acid batteries, lithium batteries are relatively lightweight, portable, have higher energy density, and have a much longer lifespan. However, they are more expensive and have poor stability.

The so-called graphene battery can be understood as what we usually refer to as a black gold battery, which is a new energy battery developed by utilizing the rapid and massive shuttle motion of lithium ions between the graphene surface and the electrode. As the thinnest, hardest, and most conductive and thermal conductive new type of nanomaterial currently available. Meanwhile, the weight of graphene polymer batteries is only 50% of traditional batteries, and the cost will be 77% lower than lithium batteries. In terms of performance, charging all graphene lithium batteries once takes no more than 10 minutes. (In general, the industry directly refers to graphene based energy storage materials doped with electrodes as graphene batteries, rather than all graphene.)

From the perspective of characteristics, the comprehensive performance of graphene batteries is the best, but why has it not become dominant? The application of graphene in batteries is mainly to combine with silicon in the negative electrode of the battery to replace the original graphite, which can improve the overall capacity and charging speed of the battery, but the performance improvement effect is limited. On the other hand, although many companies have launched black gold batteries, most of them are in the exploratory stage in this field, and their prices are relatively high, so this is also one of the reasons why they cannot be significantly applied. In addition, graphene pollution is relatively severe, and graphene production requires a large amount of sulfuric acid, which is also very troublesome to treat. Simply put, first, price; Secondly, technology; Thirdly, handle the trouble.

Let's take a look at the introduction of the new national standard, which has clear regulations on the speed and weight of electric bicycles. This means that large lead-acid batteries will gradually lose their market, while small lead-acid batteries will experience certain development in the short term. But with the promotion of environmental protection rectification, there will still be a transition from lead-acid batteries to lithium batteries, and lithium electric vehicles will inevitably usher in an explosive period. Someone might say, what about graphene batteries? Although graphene batteries have many advantages that lead-acid and lithium batteries do not have, their technology must undergo breakthrough development in order to become dominant. Therefore, personally, I am more optimistic about the application of small lead-acid batteries and lithium batteries in future new national standard electric vehicles.

Compared to lead-acid batteries, lithium batteries have a higher average voltage and higher energy density. In other words, batteries of the same size have more capacity. In addition, lithium batteries are relatively lightweight, convenient to carry, and have a much longer lifespan. In addition, lithium batteries have stronger adaptability to high and low temperatures, are less affected by temperature factors, and are more environmentally friendly.

Of course, lithium batteries also have three drawbacks, their safety and stability are relatively poor, and if operated improperly, there is a high risk of explosion. In addition, lithium batteries cannot discharge at high currents and require high production conditions, resulting in higher costs.

Compared with lithium batteries, lead-acid batteries are relatively cheaper and more easily accepted by the public. In addition, lead-acid batteries have better high rate discharge performance. The most important thing is that the recycling price of lead-acid batteries is higher than that of lithium batteries.

However, lead-acid batteries also have their own drawbacks, such as heavy metals easily causing environmental pollution; Compared with lithium batteries, lead-acid batteries have lower energy density; And its service life is not as long as that of lithium batteries.

Although lithium-ion electric vehicles have many advantages, currently, lead-acid electric vehicles are the main factor, and the main factor is the imperfect technology. Although some lead-acid and electric vehicle giants have started to develop lithium-ion products, as a new field of entry, many enterprises are constantly exploring and exploring, and early products may not reach a mature level.


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