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Many people have a question when considering purchasing energy storage products, which energy storage product is better (longer life)? However, this is often determined by the battery inside. Generally, it is a ternary lithium battery and a lithium iron phosphate battery. So which one is better and what is the difference?
Lithium iron phosphate battery (LiFePO4) refers to a lithium ion battery with lithium iron phosphate as the positive electrode material. The cathode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, etc., of which lithium cobalt oxide is the cathode material used in most lithium-ion batteries.
Ternary polymer lithium battery refers to a lithium battery whose positive electrode material is lithium nickel cobalt manganese oxide (Li(NiCoMn)O2) or nickel cobalt aluminate ternary positive electrode material. The ternary composite cathode material uses nickel salt, cobalt salt and manganese salt as raw materials, and the ratio of nickel, cobalt and manganese can be adjusted according to actual needs. The battery with the ternary material as the positive electrode is safer than the lithium cobalt oxide battery, but the voltage is too low, so when it is used in the mobile phone (the cut-off voltage of the mobile phone is generally around 3.0V), there will be an obvious feeling of insufficient capacity.
The energy density of ternary lithium batteries will be higher than that of lithium iron phosphate batteries. If it is the same power, the volume of the ternary lithium battery will be about twice smaller than that of the lithium iron phosphate battery. Most ternary lithium batteries are also used as 18650 batteries, which are also commonly used by Tesla, and lithium iron phosphate batteries are often used on buses. Tesla can go further with a ternary battery because of its light weight and long range. Another reason why buses do not use ternary lithium batteries is for safety reasons. Lithium iron phosphate batteries do not burn in the event of a short circuit. In actual use, the lithium iron phosphate battery has high temperature resistance and strong safety and stability. Cheaper and better cycle performance.
Both of these batteries can be used for energy storage, but it depends on which point you value, but if you want to use it at home, for safety, because charging indoors is more dangerous, it is easy to short circuit and cause fire, it is recommended to choose lithium iron phosphate battery. If it is only used outdoors, it is no problem to choose a ternary battery.