Advantages and disadvantages of ternary lithium battery

Ternary lithium-ion battery.

The ternary lithium-ion battery is a kind of lithium-ion battery: the first is to make the positive data of the battery. Typically, the cathode of a lithium-ion battery is lithium cobalt oxide.

The ternary lithium-ion battery is a battery with excellent comprehensive performance and balanced capacity and safety. The main functions and strengths of the three metallic elements are as follows:
Co3+: Reduces cationic mixing occupancy, stabilizes data hierarchical structure, reduces impedance value, increases conductivity, and improves cycling and power performance.

Ni2+: can increase the capacity of the data (improve the volume energy density of the data), and due to the similar Li radii and Ni, too much Ni can also lead to mixed Li-Ni due to dislocations with Li-large Ni concentration in the Li layer, The more difficult Li is to overcome the layered structure, resulting in poor electrochemical performance.

Mn4+: Not only reduce the cost of data, but also improve the security and stability of data. However, too high manganese content is prone to spinel phase, which destroys the layered structure, resulting in reduced capacitance and cycle attenuation.

The advantages of the ternary lithium-ion batteries

1. High voltage channel
The voltage channel is an important indicator of the battery energy density, which determines the basic efficiency and cost of the battery. The higher the voltage channel, the larger the specific capacity, the battery with the same volume, components, and even the same ampere-hour, the higher the voltage channel, the longer the ternary data range of the lithium-ion battery. The voltage channel of ternary data is significantly higher than that of lithium iron phosphate, the high voltage line reaches 4.2 volts, and the discharge channel reaches 3.6 or 3.7 volts.

2. High energy density
The biggest advantage of high energy density is the ternary lithium-ion battery, and the energy density of the voltage channel battery is an important goal, the higher the resolution unit, basic performance and cost, the higher the voltage channel, the larger the specific capacity, so the same volume, weight , Even when the same battery, high-voltage channel ternary lithium-ion battery life is longer.

3. High vibration density
Vibration density refers to the mass per unit volume measured after the powder in the container is vibrated under specified conditions. Bulk density or bulk density (called bulk density in some industries) is the mass of a sample divided by its volume, which includes the sample itself and the pore and interstitial volume of the sample.

Defects of ternary lithium-ion batteries

Poor safety, high temperature resistance, short life, poor discharge performance. Poor safety and short cycle life are the main shortcomings of ternary lithium-ion batteries, especially their safety performance has always been an important factor restricting their large-scale configuration and large-scale integrated applications. A large number of actual measurement results show that it is difficult for large-capacity ternary batteries to pass safety tests such as acupuncture and overcharge, which is why large-capacity batteries generally introduce more manganese, or even mix with lithium manganate. The 500 cycle life of lithium-ion batteries is at a medium level, so the important application areas of ternary lithium-ion batteries are consumer electronic products such as 3C digital products.