Which is better between NiMH rechargeable batteries and lithium batteries? This can’t be concluded. The two have their own advantages. It mainly depends on what kind of electrical appliances you use. For example, a mobile phone battery is more suitable for using lithium batteries. However, on digital cameras, digital cameras have a considerable demand for current, plus The power consumption is also much larger than that of the mobile phone, and the nickel-metal hydride battery is slightly better in the high current output.
NiMH rechargeable batteries:
NiMH battery is a kind of battery with good performance. Ni-MH batteries are divided into high-voltage Ni-MH batteries and low-voltage Ni-MH batteries. The positive active material of nickel-hydrogen battery is Ni, the negative active material is metal hydride, also known as hydrogen storage alloy, and the electrolyte is 6mol/L potassium hydroxide solution. As an important direction of hydrogen energy application, nickel-metal hydride batteries have attracted more and more attention.
In terms of battery power, Ni-MH rechargeable batteries of the same size are about 1.5 to 2 times higher than Ni-Cd batteries and have no cadmium pollution. They have been widely used in mobile communications, notebook computers and other small portable electronic devices. . Higher-capacity nickel-metal hydride batteries have begun to be used in gasoline/electric hybrid vehicles.
Pay attention to maintenance when using NiMH batteries
1. Avoid overcharging during use. Within the cycle life, overcharging should be avoided during use, because overcharging will easily cause the positive and negative electrodes to expand, causing the active material to fall off and the diaphragm to be damaged, the conductive network to be destroyed, and the ohmic polarization of the battery to increase.
2. Prevent electrolyte deterioration. During the cycle life of the NiMH battery, the hydrogen evolution of the battery should be suppressed.
3. Storage of NiMH batteries. The nickel-metal hydride battery should be stored after being fully charged. If the battery is stored for a long time without storing electrical energy in the battery, the function of the hydrogen storage alloy of the negative electrode of the battery will be weakened, and the battery life will be shortened.
Which is better between NiMH rechargeable batteries and lithium batteries?
The advantages and disadvantages of nickel-metal hydride batteries
Nickel-metal hydride batteries have a larger output current than carbon-zinc batteries or alkaline batteries and are relatively more suitable for high power consumption products. Some special models of power type even have a larger output current than ordinary nickel-cadmium batteries.
Less obvious memory effect and even many brands of NiMH batteries have claimed no memory effect.
Long cycle life, can be used more than 500 times under correct use conditions.
The old nickel-metal hydride battery has a high self-discharge rate, and the self-discharge rate is 30-35% when fully charged at room temperature, but the new nickel-metal hydride battery has a relatively low self-discharge rate.
Poor high-temperature resistance, try not to let the temperature of the battery be higher than 45 degrees. Otherwise, the lifespan will be quickly reduced, and the internal resistance of the battery will increase.
Overcharging has a great impact on battery life and is dangerous, so stop charging when the battery is fully charged.
The advantages and disadvantages of lithium batteries
energy is relatively high. It has a high reserve density, which has reached 460-600Wh/kg, which is about 6-7 times that of lead-acid batteries;
Long service life, the service life can reach more than 6 years;
With high power tolerance, the lithium iron phosphate lithium-ion battery for electric vehicles can reach 15-30C charge and discharge capacity, which is convenient for high-intensity startup acceleration;
The self-discharge rate is very low, which is one of the most prominent advantages of the battery, generally less than 1%/month, less than 1/20 of the nickel-metal hydride battery;
Lightweight, the weight is about 1/6-1/5 of lead-acid products under the same volume;
The lithium battery has strong adaptability to high and low temperatures and can be used in an environment of -20℃--60℃. After technical treatment, it can be used in the environment of -45℃;
Lithium batteries are green and environmentally friendly. Regardless of the production, use, or scrap, they do not contain or produce any toxic and harmful heavy metal elements and substances such as lead, mercury, and cadmium;
Lithium primary batteries have poor safety and there is a danger of explosion;
The use conditions are limited, and the high and low-temperature use is dangerous.
The main difference between lithium batteries and nickel-metal hydride batteries is that lithium batteries are more suitable for use in mobile phones, but on digital cameras, due to the considerable demand for current and the power consumption is much larger than that of mobile phones, it is necessary to use nickel-metal hydride batteries. better. In recent years, more and more digital cameras use nickel-metal hydride batteries, and battery manufacturers are optimistic about this market. They have launched high-capacity nickel-metal hydride rechargeable batteries, making the technology of nickel-metal hydride batteries advance by leaps and bounds, and the capacity is also increasing. The batteries are comparable, even the chargers are getting better and better, and the charging time is greatly shortened.
As a relatively mature product, nickel-metal hydride batteries have a much lower manufacturing cost than lithium batteries. In addition, the quality control of nickel-metal hydride batteries is very difficult, and the yield of nickel-metal hydride batteries produced is much higher than that of lithium batteries. , so under the combined effect of manufacturing cost and high yield, nickel-metal hydride batteries are more economical. In addition, nickel-hydrogen batteries do not contain harmful substances and are relatively friendly to the environment. At the same time, because the components of nickel-hydrogen batteries contain rare earth, they can also be recycled, which is more environmentally friendly than lithium batteries.
At present, in many high-tech fields, nickel-metal hydride batteries have become the first choice. Even in the automotive industry, many manufacturers have begun to use nickel-metal hydride batteries to improve their market response.
Rechargeable lithium batteries are widely used in many new mobile devices due to their advantages of small size (relatively), lightweight, low self-discharge rate, and no memory effect compared with ordinary nickel-cadmium/nickel-metal hydride batteries. The batteries of mobile phones, notebook computers, PDAs, and other mobile devices we usually use have been gradually replaced by lithium batteries.
The above is the comparison between nickel-metal hydride rechargeable batteries and lithium batteries. No matter what kind of battery it is, the one that suits you is the best!
