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LiFePO4 batteries Analysis of difficulties in light electric vehicle market

2021-09-14

LiFePO4 batteries Analysis of difficulties in light electric vehicle market

Lithium iron phosphate batteries have the following outstanding advantages:

1. It does not contain precious metals such as cobalt and nickel, the preparation process is simple, and the cost is relatively low

2. Longer cycle life, some high-end products can reach a cycle life of more than 6000 times

3. The material has good thermal stability and relatively outstanding safety performance

4. The domestic industrial chain is mature, the production capacity is large, and the product models are abundant

In the light electric vehicle market, with the continuous improvement of the degree of lithium-ionization, the installed capacity of lithium iron phosphate batteries has also continued to increase, but the inherent shortcomings of lithium iron phosphate batteries have a certain negative impact on the expansion of the market share of lithium iron phosphate batteries.


Straight charge and discharge voltage curve

As we all know, the charging and discharging voltage curve of lithium iron phosphate battery is relatively straight. This problem has little effect on charging. Charging is basically blind charging. Protect it at 3.6~3.65V and stop charging. However, the impact on the discharge is very large, mainly affecting the estimation accuracy of the SOC. A piece of software BMS with SOC calculation function costs at least one hundred yuan or more, which is somewhat unbearable for light-duty electric vehicles that are very cost-sensitive.

 

Poor charging and discharging performance at low temperature

Some lithium iron phosphate batteries that have not been optimized for low-temperature design are difficult to charge below zero and difficult to effectively discharge below -20°C. In recent years, research on the improvement of low-temperature performance of lithium iron phosphate batteries has made very significant progress. Through the surface carbon coating and ion doping of the positive electrode material, the increase of carbon nanotubes/graphene as the conductive agent and the lithium salt of the electrolyte Material optimization and the addition of low temperature resistant additives, as well as the amorphous carbon coating for the negative electrode graphite material, can improve the low temperature performance of the lithium iron phosphate battery to a certain extent, and can ensure that the lithium iron phosphate battery is at a temperature of -30°C , It can still charge and discharge effectively, and the reversible capacity can reach 80% of normal temperature.

However, these improvements will inevitably lead to an increase in cost while significantly improving low-temperature performance.


We can believe that through the efforts of many enterprises, these problems will be effectively solved, allowing lithium iron phosphate batteries to occupy an important position in the light electric vehicle market.


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