Advantages and disadvantages of lithium iron phosphate (LiFePO4) battery and nickel hydrogen battery

Lithium iron phosphate battery is a new type of lithium ion battery with lithium iron phosphate (LiFePO4) as its positive electrode material. Its remarkable feature is that lithium iron phosphate has a wide range of raw materials and low price (about 1/5 of lithium cobalt oxide), and is safe. Excellent performance (no need to worry about explosion hazard), excellent overcharge resistance, excellent discharge performance, excellent cycle performance, good storage performance, low discharge, and environmental protection. It not only takes into account the advantages of LiCoO2, LiNiO2 and LiMnO2 materials, but also has heat. Stable, several simple advantages are simply "durable, safe, and cheap." LiFePO4 is considered to mark the "new arrival of a new era of lithium-ion batteries", is a new generation of rechargeable batteries, can be widely replaced with disposable dry batteries.

Since lithium iron phosphate batteries have so many advantages, why are they not widely used in consumer electronics such as mobile phones and digital cameras?

The original lithium iron phosphate battery material has a problem at present - the low density of tapping during the production process (simply said that the volume of the large-capacity battery will be a bit large), such as used in consumer electronics products that are very concerned about the volume. Lithium iron phosphate battery is difficult to achieve large capacity. Today, AA-type nickel-metal hydride rechargeable batteries have achieved 2000 mAh or more. Commercial AA-type lithium iron phosphate batteries can only achieve 600 mAh capacity, and the nominal capacity is a little small. However, the following practical application still makes us prefer lithium iron phosphate battery. Many friends' digital cameras use 2500mAh, 2700mAh brand-name NiMH batteries. After using them for a period of time, they are not easy to use. On the low-power alarm, even the machine can not be opened, a large number of batteries, can not take a few photos, the reason is that the camera often has a low-power alarm, because the camera voltage detection is too early protection, it was found that when it is below 2.37V Start the alarm, when the 2.10 volts, shut down and prompt to change the battery. Taking the battery measurement found that there is still 60% of the electricity. Nickel-metal hydride batteries are 1.2V single-section, two-section series is 2.4V, and the voltage requirements of all digital cameras with 5th battery are based on disposable alkaline batteries: generally 3V (2 batteries), also 6V (4 batteries), ordinary 5th alkaline battery nominal 1.5V, new battery up to 1.7V. To provide a high supply voltage, only multiple cells are connected in series, which leads to an increase in the internal resistance of the battery in the entire circuit cycle, and the output current is limited. This is the reason why the remaining battery power is too large to drive the camera. As a result, the voltage of the nickel-metal hydride battery is obviously too low! Even though there is more than 2,700 mAh of electricity, the voltage is too low and there is no electricity. Solving the battery voltage is king! The terminator of NiMH battery, Ronda's new generation 3.2V lithium iron phosphate battery, the most cost-effective battery, for you to easily solve the digital camera power problem, a 5th AA battery is only 600 mAh The power, but a battery can take more than 300 photos, 45-50 minutes of video, let you enjoy the fun of photography! Enjoy the fun of life!

In this regard, the average user can also understand from the following figure. Although the nickel-hydrogen battery has a high nominal capacity, the actual usable capacity is not high. It is like a large bucket placed on the ground. The water flow is not as good as a small bucket placed at a high place. The nickel-hydrogen battery is used on a digital camera. Can't use it!