Technical complementarity between NI-MH rechargeable battery and lithium-ion battery

Ni-MH rechargeable batteries and lithium-ion batteries are two mainstream rechargeable battery technologies, each with its own unique advantages and limitations. In terms of technical complementarity, the two can learn from each other and jointly promote the progress and development of battery technology.
Lithium-ion batteries are significantly better than NI-MH rechargeable batteries in terms of energy density. At present, the energy density of lithium-ion batteries has reached 240-300Wh/kg or even higher, while the energy density of nickel-metal hydride batteries is up to about 140Wh/kg. This means that under the same volume or weight, lithium-ion batteries can store more energy and are suitable for use in scenarios with higher energy density requirements, such as portable electronic devices, electric vehicles, etc. On the contrary, NI-MH rechargeable battery is relatively heavy in weight, but its low cost and better safety performance give it an advantage in certain situations with higher cost and safety requirements.
In terms of cycle life, lithium-ion batteries usually have a longer service life, with the number of charge and discharge cycles reaching more than 1,000 times, while the cycle life of NI-MH rechargeable batteries is generally around 500 times. This advantage of lithium-ion batteries makes them more durable in applications that require frequent charging and discharging, reducing long-term use costs. However, NI-MH rechargeable battery has better cycle stability in high-temperature environments and strong resistance to overcharge and over-discharge, which is particularly important for applications in certain special working environments.
NI-MH rechargeable battery has good performance in terms of safety, is not easy to burn and has a relatively mature overcharge and over-discharge protection mechanism. The inorganic electrolyte system used inside makes the battery less prone to thermal runaway when overcharged or overdischarged. Although lithium-ion batteries have high energy density, there is a risk of thermal runaway and explosion, especially under bad conditions such as high temperature, short circuit or external impact. Therefore, in terms of safety, NI-MH rechargeable battery provides important reference and reference for lithium-ion batteries.