What material is recommended for the data center?
Lithium iron phosphate "Goodenough"
The 2019 Nobel Prize in Chemistry was awarded to John B Goodenough, M. Stanley Whittingham and Akira Yoshino in recognition of their contributions to the development of lithium-ion batteries.
In particular, John Goodenough became the oldest Nobel Prize winner in history. His lifetime exploration of lithium batteries is particularly admirable. Lithium iron phosphate (LFP) is one of his important contributions. The most environmentally friendly lithium ion battery cathode material.
The application of lithium batteries, especially lithium iron phosphate in data centers and communication base stations, is just like the name of the old man, which is already Goodenough.
Why is lithium iron phosphate recommended?
At present, the mainstream lithium batteries in the industry are divided into lithium cobaltate, lithium manganate, lithium iron phosphate, and ternary lithium. Lithium cobaltate is mainly used in the mobile phone battery industry; lithium manganate is mainly used in the electric bicycle industry; lithium iron phosphate is widely used in buses / buses for energy storage and energy storage power stations; ternary lithium is widely used in household vehicles / taxi storage Energy, energy storage power station industry. In the data center scene, lithium iron phosphate and ternary lithium batteries are commonly used. Lithium iron phosphate has higher reliability and ternary lithium has an energy density advantage.
1.Lithium iron phosphate structure is more stable
From the perspective of molecular structure, the molecular structure of lithium iron phosphate is an olive-shaped three-dimensional structure, while the molecular structures of lithium cobaltate and ternary lithium are both layered two-dimensional structures. The 2D layered structure is prone to collapse. Relatively speaking, lithium iron phosphate molecules Structure is more stable.
2.Lithium iron phosphate has high thermal stability, slow heat production rate, and low heat production.
Lithium iron phosphate is stable at high temperature, and the high-temperature heat generation peak is not obvious. The peak heat generation power is only about 1W. At high temperature or high pressure, the ternary is easy to evolve oxygen and intensify combustion. Second level), the system is difficult to react to control the total heat output, lithium iron phosphate is significantly lower than ternary, lithium manganate and other materials (the area of the heat generation power curve and the horizontal axis represents the total heat output)
Figure 3: Comparison of heat generation curves under different high-temperature conditions of lithium batteries
Source: P. Peng, F. Jiang. , Thermal safety of lithium-ion batteries with various cathode materials: A numericalstudy.
International Journal of Heat and Mass Transfer. 103 (2016) 1008 & ndash; 1016
3.The thermal runaway reaction of lithium iron phosphate does not produce combustion promoters
Lithium iron phosphate does not generate oxygen after thermal runaway, while lithium manganate, lithium cobaltate, and ternary lithium all generate oxygen after thermal runaway, so it is easier to catch fire.
The temperature required for thermal runaway of lithium iron phosphate is relatively high. Relatively speaking, the temperature points for thermal runaway of lithium manganate, lithium cobaltate, and ternary lithium are far lower than that of lithium iron phosphate.