Shandong Weigao New Energy Technology Co., Ltd., energy is the cornerstone of social science and technology development. At present, with the increasing global pollution, energy conservation and environmental protection has become the top priority of social development. At present, China vigorously promotes environmental protection and has introduced some related Policies, so there are more and more environmentally friendly equipment on the market. Including the reduction of gasoline vehicles, the market launch of new energy vehicles, and products such as charging treasures are all environmentally friendly batteries. That is, the lithium battery, the ternary lithium ion battery has the characteristics of short charging time, long cycle life, energy saving, environmental protection, no pollution, light weight and long service life. Said that it has a long life, can it be several years?
The ternary lithium ion battery is a lithium battery with a positive electrode material of three yuan. The lithium iron phosphate crystal has stable chemical properties, and in actual use, it will not be hot or explode even in the case of over-charging or high temperature. The cycle life of lead-acid batteries can also reach 500 times, and the cycle life of ternary lithium-ion batteries can reach more than 1000 times, which far exceeds that of lead-acid batteries.
According to the ternary lithium-ion battery cycle 1000 times, it is fully charged and discharged in three days, and the service life reaches 8.3 years. Even if there is a loss process, it can reach more than 7 years.
Lead-acid batteries have a fast depreciation rate and require constant maintenance. The long-term use time is no more than one and a half years. In contrast, the lifetime of a ternary lithium-ion battery can reach 7 years under the same conditions. The ternary lithium-ion battery adapts to a wide operating temperature, and its electric heating peak can reach 350 ° C -500 ° C. Compared with ordinary lead-acid batteries, its energy storage capacity is stronger, and its materials are relatively lighter.
The ternary lithium-ion battery does not contain any rare earth metals and heavy metals, and is environmentally friendly. It is a new type of green battery. However, ternary lithium-ion batteries also have their own shortcomings, such as poor performance in low-temperature environments, volume is greater than the lead-acid battery under the same conditions, so there must be a big gap in the development of micro-batteries.
As a rechargeable lithium battery, the ternary lithium battery has stable output voltage, high output voltage, stable performance, large capacity, long service life, wide operating temperature range, good safety and environmental protection, so it has a future development path for lithium batteries. There is a lot of room for improvement, but it needs to be continuously researched in order to achieve the goal of improving its own defects.
Lithium iron phosphate battery: refers to a lithium ion battery using lithium iron phosphate as a positive electrode material. Its characteristics are that it does not contain precious elements such as cobalt. The raw material price is low and phosphorus and iron are abundant in the earth's resources, and there is no problem of feeding. Its working voltage is moderate (3.2V), its capacity per unit weight is large (170mAh/g), high discharge power, fast charging and long cycle life, high stability under high temperature and high heat environment.
Advantages Compared with the more common lithium cobalt oxide and lithium manganate batteries currently on the market, lithium iron phosphate batteries have at least five advantages: higher safety, longer service life, and no heavy metals and rare metals ( Low raw material cost), fast charging and wide operating temperature range.
Disadvantages Lithium iron phosphate has some performance defects, such as low tap density and compaction density, resulting in low energy density of lithium ion battery; material preparation cost and battery manufacturing cost are high, battery yield is low, consistent Poor sex; poor product consistency; intellectual property issues.
Ternary polymer lithium battery: A lithium battery of a lithium lanthanum manganese oxide (Li(NiCoMn)O2) ternary positive electrode material is used as a positive electrode material. According to Tsinghua University Ouyang Minggao: The "three yuan" material referred to in this survey refers to the "three-dimensional power battery" in the usual saying that the positive electrode is ternary and the negative electrode is graphite. In actual research and development applications, there is also a positive electrode is ternary, the negative electrode is lithium titanate, commonly known as "lithium titanate", its performance is relatively safe, long life, does not belong to the common "three yuan" material."
Advantages The ternary lithium ion battery has high energy density and better cycle performance than normal lithium cobaltate. At present, with the continuous improvement of the formula and the perfect structure, the nominal voltage of the battery has reached 3.7V, and the capacity has reached or exceeded the level of lithium cobalt oxide battery.
Disadvantages ternary material power lithium battery mainly includes nickel-cobalt-aluminum lithium battery, nickel-cobalt-manganese lithium battery, etc., due to the high temperature structure of nickel-cobalt aluminum, the high-temperature safety is poor, and the pH value is too high, so that the monomer is flatulent. This raises danger and is currently costly.
In contrast, the ternary polymer lithium battery does have a better quality than the lithium iron phosphate battery, but why is its development hindered? The key to the development of new energy vehicles is also the key to the mobile digital products - the development of batteries. How to ensure that battery technology can meet the growing needs of consumers in a safe situation, not only in the automotive industry-related industry, but also in the pursuit of scientific research workers in the whole field.
When it comes to buying new energy vehicles, most consumers may think of "policy concessions" for the first time. Although lithium manganese oxide lithium batteries are a bit embarrassing, they are indeed quite real reasons. In the domestic sales environment, new energy vehicles need to open up the situation, not only because of the long-term mission of “environmental protection”. The advantages of new energy vehicles in terms of selling price and maintenance cost have indeed attracted most of the consumers who still use car-based costs at this stage.
However, some consumers may stop their curiosity about new energy vehicles for some reason, because it will be overwhelmed by the various spontaneous combustion events of new energy vehicles. And this is why I wrote this article today. You must know that you don't understand the fundamentals of new energy vehicles - the advantages and disadvantages of energy modules, and if you don't understand the things you need to pay attention to during use, it is no different from buying a time bomb.
Lithium iron phosphate lithium ion battery: mature but not enough
Lithium iron phosphate lithium ion battery material is currently the most safe lithium ion battery cathode material, plus its cycle life of more than 2000 times, standard charging (5 hour rate) use, lithium manganese oxide lithium ion battery
It can achieve 2,000 cycles, coupled with the price threshold and technology decline brought about by the maturity of the industry, many manufacturers will use lithium iron phosphate batteries for various reasons. It can be said that the rise of new energy vehicles has an inseparable relationship with lithium iron phosphate batteries.
However, lithium iron phosphate batteries have a fatal disadvantage, that is, poor low temperature performance, even if they are nano-sized and carbon coated, this problem is not solved. Studies have shown that a battery with a capacity of 3500 mAh, if operated in a -10 ° C environment, after less than 100 charge and discharge cycles, the power will be abruptly attenuated to 500 mAh, basically scrapped. This is indeed not a good thing for China, which has a vast territory and a relatively low temperature in winter.
In addition, the preparation cost of the material and the manufacturing cost of the battery are high, the battery yield is low, and the consistency is poor, which is also an important reason that many pure electric vehicles have no endurance ability to reach the nominal value. Therefore, we can see that there are quite a few new energy vehicles in China (whether pure electric or hybrid electric), or some relatively cheap new energy vehicles, which will choose lithium iron phosphate batteries for different reasons. It can be said that the use of lithium iron phosphate batteries has an indelible foundation for the mass production and promotion of new energy vehicles.
In contrast, the ternary polymer lithium battery does have a better quality than the lithium iron phosphate lithium ion battery, but why is its development hindered?