What are the key factors in the performance of lithium-ion batteries

Cathode material is one of the key materials that determine the performance of lithium-ion batteries, and is also an important source of lithium in current commercial lithium-ion batteries. Its performance and price have a greater impact on lithium-ion batteries. At present, Gripp has successfully developed and widely used lithium cobalt oxide, lithium iron phosphate, and ternary materials. Regarding how to choose between the three, let's briefly analyze today. Lithium iron phosphate lithium iron phosphate lithium ion battery is a kind of lithium ion battery, which uses lithium iron phosphate ion as the positive electrode material. It is characterized by strong safety and stability, high temperature resistance, and good cycle performance. Ternary lithium ion is also referred to as a ternary polymer lithium ion battery, which refers to a lithium ion battery with nickel cobalt manganate lithium ion or nickel cobalt aluminate lithium ion as the positive electrode material. Due to the smaller size and higher capacity density of ternary lithium-ion batteries, they are currently being widely used in new energy vehicles. For example, we are familiar with Tesla, and all its models use ternary lithium-ion batteries. Lithium cobalt oxide lithium cobalt oxide battery has stable structure, high specific capacity and outstanding comprehensive performance. It is mainly used for small and medium-sized batteries, and is widely used in notebook computers, mobile phones, MP3/4 and other small electronic devices, and other portable electronic devices , The nominal voltage is 3.7V. Its characteristics: superior electrochemical performance, excellent production performance, high density, help to increase the volumetric capacity of the battery, stable product performance, and good consistency. From the perspective of energy density and safety, lithium iron phosphate batteries, ternary lithium ion batteries and lithium cobalt oxide batteries with better comprehensive performance have become the mainstream of power lithium batteries. 1. Lithium iron phosphate (LFP): Low energy density and high safety. Lithium iron phosphate is currently one of the cathode materials that has received wide attention. The theoretical specific capacity is 170mAh/g, and the actual specific capacity can reach more than 150mAh/g. With low cost, good safety, and long cycle life, lithium iron phosphate batteries are widely used in industrial fields. 2. Lithium cobalt oxide (LCO): suitable for small batteries, high capacity, safe and stable. Lithium cobalt oxide is the first-generation commercial cathode material. Its performance has improved in decades of development and has become the most mature lithium-ion battery cathode. material. Lithium cobalt oxide has the advantages of high discharge platform, high specific capacity, good cycle performance, and simple synthesis process. Lithium cobalt oxide is the best choice for small lithium-ion batteries. At present, most of 3C electronics use lithium cobalt oxide ions. In small batteries that pay more attention to volume density, lithium cobalt oxide occupies a place. 3. Ternary materials (NCM, NCA): performance-adjustable ternary materials are commonly known as lithium ion nickel cobalt manganese oxides (LiNixCoyMn1-x-yO2), which are very similar in structure to lithium cobalt oxide. , Cyclicality, safety and cost can be balanced and regulated. The different configurations of the three elements of nickel, cobalt and manganese will bring different properties to the material: the increase in nickel content will increase the capacity of the material, but will make the cycle performance worse; the presence of cobalt can make the material structure more stable, but the content is too high. High content will reduce the capacity; the presence of manganese can reduce costs and improve safety performance, but too high a content will destroy the layered structure of the material. Therefore, finding the proportional relationship of the three materials to achieve the optimization of comprehensive performance is the focus of the research and development of ternary materials. Common ratios are NCM111, 523, 622, 811, etc. NCA (LiNi0.8Co0.15Al0.05O2) replaces the manganese element with aluminum element, which improves the structural stability of the material to a certain extent, but its aluminum content is less, which can be approximately regarded as a binary material . Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.