Which is better for power lithium battery?
Currently, the most promising cathode materials used in power lithium-ion batteries are lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4) and lithium nickel manganese oxide (Li(Ni, Co, Mn) O2). Meta material. Nickel manganese lithium manganate ternary material is generally considered to be difficult to become the mainstream of power-type lithium-ion batteries for electric vehicles due to the lack of drilling resources, nickel, high drilling rate, and large price fluctuations, but it can be compared with spinel manganese acid. Lithium is mixed and used within a certain range.
For so long, there are lithium manganese oxide batteries (LiMn2O4) and lithium iron phosphate batteries (LiFePO4). Which is better for power lithium batteries?
Let’s compare their advantages and disadvantages below:
Advantages of lithium iron phosphate battery
1. Improvement of safety performance
The PO bond in lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperature or overcharge, it will not collapse and generate heat like lithium cobalt oxide or form strong oxidizing properties. Substance, so it has good safety.
2. Life-span improvement
Lithium iron phosphate battery refers to a lithium battery pack that uses lithium iron phosphate as a positive electrode material.
The cycle life of a long-life lead-acid battery is about 300 times, and the maximum is 500 times. The lithium iron phosphate power battery has a cycle life of more than 2000 times. It can be used with standard charging (5 hours rate). Reached 2000 times. Lead-acid batteries of the same quality are 'new half a year, half a year old, and half a year for maintenanceComprehensive consideration, the performance-price ratio is theoretically more than 4 times that of lead-acid batteries. High-current discharge can quickly charge and discharge high-current 2C. With a dedicated charger, the battery can be fully charged within 40 minutes of 1.5C charging, and the starting current can reach 2C, but lead-acid batteries have no such performance.
3. Good high temperature performance
The peak value of lithium iron phosphate electric heating can reach 350℃-500℃, while lithium manganate and lithium cobaltate are only around 200℃. Wide operating temperature range (-20C-75C), with high temperature resistance, lithium iron phosphate electric heating peak can reach 350℃-500℃, while lithium manganate and lithium cobaltate are only around 200℃.
4. Large capacity
When the battery is always fully charged and not discharged, the capacity will quickly fall below the rated capacity value. This phenomenon is called the memory effect. Like nickel-metal hydride and nickel-cadmium batteries, there is memory, but lithium iron phosphate batteries do not have this phenomenon. No matter what state the battery is in, it can be charged and used without having to discharge it first.
6. Light weight
The volume of a lithium iron phosphate battery with the same specification and capacity is 2/3 of the volume of a lead-acid battery, and its weight is 1/3 of that of a lead-acid battery.
7. Environmental protection
Lithium iron phosphate batteries are generally considered to contain no heavy metals and rare metals (Ni-MH batteries require rare metals), non-toxic (SGS certification passed), no Pollution, in line with European RoHS regulations, is an absolute green battery certificate. Therefore, the reason why lithium batteries are favored by the industry is mainly due to environmental protection considerations. Therefore, the battery has been included in the '863' national high-tech development plan during the 'Tenth Five-Year Plan' period and has become a key national support and encouragement project. With China's entry into the WTO, China's export volume of electric bicycles will increase rapidly, and electric bicycles entering Europe and the United States have been required to be equipped with pollution-free batteries.
But some experts said that the environmental pollution caused by lead-acid batteries mainly occurs in the company's irregular production process and recycling process. In the same way, lithium batteries belong to the new energy industry, but it cannot avoid the problem of heavy metal pollution. Lead, arsenic, cadmium, mercury, chromium, etc. in the processing of metal materials may be released into dust and water. The battery itself is a kind of chemical substance, so it is possible to produce two kinds of pollution: one is the pollution of process excrement in the production engineering; the other is the pollution of the battery after it is scrapped.
Lithium iron phosphate batteries also have their shortcomings: for example, poor low-temperature performance, low tap density of the cathode material, and the volume of lithium iron phosphate batteries with equal capacity is larger than lithium-ion batteries such as lithium cobalt oxide. There is no advantage. When used in power batteries, lithium iron phosphate batteries, like other batteries, need to face battery consistency issues.
Related lithium battery pack knowledge articles:
How to test low temperature batteries? What about the lithium iron phosphate battery?
Working principle diagram of lithium iron phosphate battery The significance of the balanced handling of the lithium battery pack pack
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