Which is more durable, nickel-metal hydride battery or lithium battery?

Nickel-metal hydride battery (NIMH) is a nickel-cadmium battery (NiCd battery). It replaces cadmium (Cd) with a metal that can absorb hydrogen (rare earth alloy or tini alloy). It can be recycled and reused.

The advantages and disadvantages of NiMH batteries are as follows:

The capacity is higher in the same volume. Taking the common No. 5 battery as an example, the nominal capacity of the Ni-MH battery can reach 2900mAh (mAh), while the Ni-Cd battery has only 1100mAh (mAh).

Ni-MH 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 have even higher output current than ordinary nickel-cadmium batteries.

Less obvious memory effects, even many brands of nickel-metal hydride batteries have claimed no memory effect.

It has a long cycle life and can be recycled more than 500 times under the correct use conditions.

The old nickel-metal hydride battery has a high self-discharge rate, and the self-discharge rate is 30 to 35% at full power and normal temperature, but the new nickel-hydrogen battery has a relatively low self-discharge rate.

Poor high temperature performance, try not to let the battery temperature exceed 45 degrees. Otherwise, the life 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.

Lithium batteries are more suitable for use on mobile phones than NiMH batteries, but in digital cameras, digital cameras have a large demand for current, and the power consumption is much larger than that of mobile phones. The battery is slightly better.

Nickel-metal hydride and nickel-cadmium batteries operate at 1.2V. However, the volumetric specific energy of nickel-hydrogen is higher than that of nickel-cadmium batteries. According to different factors in the process of making the battery, the nickel-cadmium battery has a strong memory effect, and the nickel-hydrogen memory effect is small. At the same time, nickel-cadmium batteries contain heavy metal cadmium, which has been banned. However, due to the excellent large-rate discharge performance of nickel-cadmium batteries, nickel-hydrogen batteries are not a substitute for nickel-cadmium batteries in many power tools. Therefore, nickel-cadmium batteries are temporarily allowed in the field of power tools in the ROSH standard.

The advantage of the nickel-cadmium battery is that the discharge current is large, and the nickel-hydrogen battery that is later introduced has a larger battery capacity than the nickel-hydrogen battery. Both are 1.25V batteries that used to be used on the 7th/5th battery. Now the newly introduced lithium battery is made of No. 7/5 battery, which is charged by USB port. Since the activity of lithium battery is 3.7V accessory, it is necessary to release the 1.5V/1.25V, so the circuit is tested. It can adapt to high current, and the lithium battery has higher electric density, so the capacity is higher than the above two.

If the circuit of the battery is done well, the lithium battery is better than the former.

The difference between lithium battery and nickel-metal hydride battery is mainly because lithium battery is suitable for use on mobile phones, but on digital cameras, because the demand for current is quite large, and the power consumption is much larger than that of mobile phones, the use of nickel-metal hydride batteries requires better.

Advantages and disadvantages of lithium batteries

Advantages: no memory effect, light weight.

Disadvantages: high cost, low current, not overcharged (compared to nickel metal hydride).

The lithium battery has a lithium battery (non-rechargeable) and a secondary lithium battery (rechargeable), and the secondary lithium battery is divided into a Li-ion lithium ion battery and a Li-Polymer lithium polymer battery.

In general, digital cameras use secondary lithium batteries (rechargeable), which are lighter in weight and have a volumetric energy density ratio of 48% higher than that of nickel-hydrogen batteries. Because of this, the production and sales of lithium ion secondary batteries are gradually exceeding that of nickel-metal hydride batteries. The battery has a small self-discharge and no memory effect. The number of charge and discharge cycles can reach more than 600 times, especially the Li-Polymer lithium polymer battery developed in recent years. In addition to the smaller volume, it is not subject to the general battery cylinder or square. The shape is limited and the weight is lighter.

Lithium batteries are not able to withstand full charge. If you use them carelessly, there is a danger of explosion. Therefore, you need to build a control IC to prevent overcharge, but the cost is also relatively high. Lithium batteries are not uniform because of the specifications, so there is a case where the organic type cannot be bought after the production is stopped. However, it has improved a lot.

Advantages and disadvantages of nickel-metal hydride batteries

Advantages: low price, versatility, large current, environmentally stable.

Disadvantages: heavy weight and short battery life.

The design of nickel-metal hydride batteries is derived from nickel-cadmium batteries, but there has been great progress in improving the memory effect of nickel-cadmium batteries. The main change is to replace the cadmium used in the negative electrode with a hydrogen storage alloy. Therefore, the nickel-hydrogen battery can be said to be a typical representative of material innovation. The pollution caused by nickel-metal hydride batteries is much smaller than that of nickel-cadmium batteries containing cadmium. Therefore, nickel-cadmium batteries have been gradually replaced by nickel-hydrogen batteries.

Lithium batteries, except for a few lithium batteries (NIKONEN-EL1 and 2CR5), have no battery replacement. This is very troublesome for a long time to go abroad, or a large number of users. NiMH batteries do not have such problems. Digital cameras that use NiMH batteries can usually be replaced with alkaline batteries.

In recent years, digital cameras are increasingly using nickel-hydrogen batteries. Battery manufacturers are also optimistic about this market. They have introduced high-capacity nickel-metal hydride rechargeable batteries, making the technology of nickel-hydrogen batteries soaring and increasing in capacity. The battery is comparable, and the charger is getting more and more refined, and the charging time is greatly shortened.

The difference between lithium battery and nickel hydrogen battery charging method

Many consumers often use the same concept when using the battery. Now lithium batteries are the mainstream, but the use of nickel-hydrogen batteries is still applied to lithium batteries. In fact, lithium batteries and nickel-metal hydride In addition to the different products, the battery is used in different ways.

Newly purchased lithium battery: the first three times of use to natural shutdown, and then with the original charge in the phone boot charge to full, and then continue to keep charging for about 1 hour (2000mah above about 2 hours).

Daily use: It’s full, and it’s more than an hour. Avoid late night charging (high grid voltage). The battery can be used with the charge and can be used for alarm or shutdown. Note that the battery that is turned off should be charged as soon as possible. Otherwise, the battery will self-discharge and the voltage will continue to drop, which may cause the self-locking protection to fail to charge. To develop a habit: when you arrive at the unit in the daytime and arrive at home in the evening, start charging. When you are full, leave or leave the power before you go to sleep.

Use: General lithium battery can be charged, used, and stopped. Cycle life refers to the number of full charge and full discharge, and partial charge and discharge can be understood as a fraction of the life. The key to battery use: the battery is full, you can charge for 20 minutes - half an hour to achieve saturation, but be sure to avoid charging after a long time. After a long time to continue charging will lead to side effects, the result is a drop in capacity and greater internal resistance, the capacity is shortened, a call to shut down the situation. PPC and other machines with power chip, the best has been used no power recharging, mainly to consider the problem of power display measurement.

Continue charging after the battery is fully charged is very harmful to the lithium battery. After the battery is fully charged, the battery will generate side reactions, the active material will decrease, the amount of garbage will increase, the capacity will decrease, and the internal resistance will increase. The serious overcharge will directly damage the battery structure and cause the battery to be scrapped. Some chargers now also provide a charging protection mode, which can effectively protect the battery according to whether the battery is fully charged or not.

Lithium-ion batteries can be charged at any time, and have a limited impact on life. For batteries with a fuel gauge such as PPC, it is recommended to use the automatic shutdown to charge, so as not to affect. It can be charged at any time and can be stopped at any time. If it is full, it will affect the battery life.

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