How To Measure The Quality Of Lithium-ion Battery Cathode Materials

The development of cathode materials has become an important factor restricting the further improvement of lithium-ion battery performance and the further reduction of price. In the current commercial production of lithium-ion batteries, the cost of cathode materials accounts for about 40% of the cost of the entire battery, and the cost of cathode materials directly determines the price of lithium-ion batteries.

How to measure the quality of lithium-ion battery cathode materials?

To measure the quality of lithium-ion battery cathode materials, it can be roughly evaluated from the following aspects:

(1) The positive electrode material should have a higher redox potential, so that the battery has a higher output voltage;

(2) Lithium ions can be reversibly intercalated and deintercalated in a large amount in the positive electrode material, so that the battery has a high capacity;

(3) During the lithium ion intercalation/deintercalation process, the structure of the positive electrode material should not change or change as little as possible to ensure good cycle performance of the battery;

(4) The redox potential of the positive electrode should change as little as possible during the intercalation/deintercalation process of lithium ions, so that the voltage of the battery will not change significantly, so as to ensure the smooth charging and discharging of the battery;

(5) The positive electrode material should have high electrical conductivity, so that the battery can be charged and discharged with a large current;

(6) The positive electrode does not chemically react with the electrolyte, etc.;

(7) Lithium ions should have a large diffusion coefficient in the electrode material, which is convenient for fast charging and discharging of the battery;

(8) The price is cheap and no pollution to the environment.

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