What is the reason graphene batteries have not replaced lithium batteries as batteries for electric vehicles

Known as the "king of new materials" by researchers and media, graphene is a new type of nanomaterial with high strength, good toughness, light weight, high light transmittance and good electrical conductivity.

Graphene polymer batteries, which shine in all their brilliance, have advantages such as higher energy ratio and faster charging rate, which are exactly the pain points of today's electric cars. Back in 2015, for example, huawei watt laboratory unveiled a fast-charging technology at the 56th Japan battery conference in Japan. This 3000mAh graphene battery can achieve up to 48% power in just five minutes.

What's more, back in 2014, the company Graphenano in Spain cooperated with the university of corvado in Spain to develop the first graphene polymer battery.

According to them, the battery has a number of advantages:

1. The specific energy of a graphene battery is over 600wh/kg, which is three times of the best product in the market at that time. This performance can be seen as a rolling situation in today's world (for example, the energy density of byd lithium iron phosphate battery is 150~160Wh/kg, and the energy density of tesla's latest 21700 battery system is around 300Wh/kg);

2. The range of a single voyage can be up to 1000 km;

3. Only 8 minutes or less for a single full charge;

4. The service life is four times as long as traditional hydrogenated batteries and twice as long as lithium batteries;

It weighs only half as much as a conventional battery.

6.Graphenano says the cost of this battery is 77% lower than lithium battery.

From a laboratory perspective, these data are not very doubtful, as graphene batteries are also known as "money-spinning devices" or "paper weapons". Do not believe to go to a university to look knew, research this thing very good hair article, but true arrive practical level, basic dumb fire.

To see if this is deliberately demeaning to graphene batteries, the method is simple. For example, it has been 4 years since Graphenano company came into our sight.

According to its website, the latest news is mostly about attending national conferences or the use of graphene in other products (such as dental products). With the vast electric car market, don't make money from medical supplies, either because they're crazy or because we're overestimating their products.

In fact, in terms of the current applications of graphene to batteries, it's mostly silicon, and what's called a graphene battery is essentially a lithium battery. For lithium-ion batteries, there is no way for graphene, as a carbon-based anode material, to fundamentally change the energy ratio order of magnitude.

Replacing the original graphite in the negative electrode of the battery can improve the overall capacity and charging speed of the battery, but the effect of performance improvement is limited, which is not as strong as described above.

Of course, this is not the main reason why graphene batteries are not ready for the market.

1. All-graphene batteries are very expensive and difficult to prepare and almost impossible to produce energy. Now some of the amazing data that's been published is basically from very pure graphene batteries, only in the concept stage or in the lab;

2. Doped graphene battery ACTS as a conductive agent or electrode embedded with lithium in lithium battery, but compared with the low cost of traditional conductive carbon and graphite, the performance improvement brought by the former is not enough to attract manufacturers;

3. The high specific surface area and other properties of graphene materials are incompatible with the current technical system of lithium ion battery industry;

4. In addition, the impact of other materials (for example, silicon has a higher theoretical capacity on the negative electrode) and the high difficulty in the dispersion process restrict its application in lithium batteries.

In conclusion, the first thing to note is that replacing lithium batteries with graphene batteries is unlikely in the short to medium term. "Doped graphene lithium battery" has certain application prospects, but the effect is not big enough to shake the current pattern.

The page contains the contents of the machine translation.