What is the progress of the progress of lithium battery technology? -Lithium - Ion Battery Equipment
The performance of high -voltage lithium battery depends on the structure and properties of active materials and electrolytes. The positive material is the most critical core material, and the matching effect of the electrolyte is also important.
At present, the most widely used high -voltage cathode material is a two -dimensional layered lithium cobalt oxide. This structure is & alpha; -nafeo2, which is more suitable for insertion and removal of lithium ions. The theoretical energy density of lithium cobalt oxides is 274mAh/g. The processing process is simple, the electrochemical performance is stable, and the market share is high. The actual energy density of lithium cobalt oxides is about 167mAh/g (working voltage is 4.35V). Increasing its working voltage can significantly increase its energy density. For example, increase its working voltage from 4.2V to 4.35V, which can increase its energy density by about 16%.(Lithium - Ion Battery Equipment)
However, under Gaodianya, lithium ions have been embedded and degraded from the materials many times, resulting in the structure of lithium cobalt acid changed from a three -way system to a single -inclined system. At this time, lithium cobaltate materials no longer have the ability to embed and de -activated lithium ions. At the same time, the particles of positive substances become loose and falling off from the set fluid, resulting in the increase in the internal resistance of the battery and poor electrochemical performance.
At present, the modification of lithium cobaltate positive materials is important to improve the stability of the crystal structure and interface stability lithium cobalt oxide high -pressure material in terms of doping and coating.
For example, high -end mobile phone battery manufacturers put forward higher requirements for the performance of batteries, which importantly reflects higher requirements for energy density. For example, the energy density of the 4.35V mobile phone battery with carbon as the negative electrode is about 660Wh/L, and the energy density of the 4.4V mobile phone battery is about 740Wh/L. This requires the positive electrode material. Higher compact density, high spatial utilization, high, and high -pressure material structures have good stability.
However, the disadvantages such as cobalt resources and expensive disadvantages such as cobalt resources are lack of cobalt resources. In addition, cobalt ions have a certain toxicity, which limits its widespread application in power lithium ion batteries.
At present, the most widely used high -voltage cathode material is a two -dimensional layered lithium cobalt oxide. This structure is & alpha; -nafeo2, which is more suitable for insertion and removal of lithium ions. The theoretical energy density of lithium cobalt oxides is 274mAh/g. The processing process is simple, the electrochemical performance is stable, and the market share is high. The actual energy density of lithium cobalt oxides is about 167mAh/g (working voltage is 4.35V). Increasing its working voltage can significantly increase its energy density. For example, increase its working voltage from 4.2V to 4.35V, which can increase its energy density by about 16%.(Lithium - Ion Battery Equipment)
However, under Gaodianya, lithium ions have been embedded and degraded from the materials many times, resulting in the structure of lithium cobalt acid changed from a three -way system to a single -inclined system. At this time, lithium cobaltate materials no longer have the ability to embed and de -activated lithium ions. At the same time, the particles of positive substances become loose and falling off from the set fluid, resulting in the increase in the internal resistance of the battery and poor electrochemical performance.
At present, the modification of lithium cobaltate positive materials is important to improve the stability of the crystal structure and interface stability lithium cobalt oxide high -pressure material in terms of doping and coating.
For example, high -end mobile phone battery manufacturers put forward higher requirements for the performance of batteries, which importantly reflects higher requirements for energy density. For example, the energy density of the 4.35V mobile phone battery with carbon as the negative electrode is about 660Wh/L, and the energy density of the 4.4V mobile phone battery is about 740Wh/L. This requires the positive electrode material. Higher compact density, high spatial utilization, high, and high -pressure material structures have good stability.
However, the disadvantages such as cobalt resources and expensive disadvantages such as cobalt resources are lack of cobalt resources. In addition, cobalt ions have a certain toxicity, which limits its widespread application in power lithium ion batteries.
