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MoreThe voltage range of lithium-ion batteries and the discharge curve of lithium batteries
The theoretical standard voltage of the battery is determined by the difference between the standard electrode potential of the positive electrode and the standard electrode potential of the negative electrode; the discharge curve is one of the basic methods for studying battery performance. According to the discharge curve, it can be judged whether the battery performance is stable, and when the battery is working stably The maximum allowable current. Lithium battery manufacturers will explain the voltage range and discharge curve of lithium-ion batteries.
2020-09-27 -
MoreIntroduction to the main components of lithium-ion batteries
The middle reaches of the lithium battery industry chain are mainly divided into battery materials and lithium battery equipment. Battery materials involve various positive and negative materials, as well as electrolyte, tabs, separators, and batteries.
2020-09-21 -
MoreThe power battery of future new energy vehicles-graphene power battery
After the successful development of graphene batteries, if mass production is possible, it will bring new changes to the power battery industry and even the electric industry. Change the way people travel and promote changes in the automotive industry.
2020-09-18 -
MoreLow salt concentration electrolyte reduces the cost of sodium ion batteries
Electrolyte is an indispensable part of energy storage batteries, and regulating the concentration of electrolyte is one of the effective strategies to realize its functional design.
2020-09-17 -
MoreNew Materials Institute has made progress in manganese-based spinel cathode materials for lithium batteries
The cathode material is generally considered to be the decisive factor in determining the performance of lithium-ion batteries. Ideally, the positive electrode should provide high specific capacity, high operating voltage, low cost, superior safety and long cycle life within a wide operating temperature range to meet requirements such as hybrid electric vehicles, embedded hybrid electric vehicles and pure Requirements for applications such as electric vehicles. Among the existing cathode materials, manganese-based spinel lithium manganese oxide LiMn2O4 (LMO) has been widely used due to its high voltage (Li/Li+≈4.0V) and low cost. However, poor cycle performance and relatively low capacity greatly limit its wide application as a lithium battery cathode material. The reason is that poor cycle stability is directly related to the structural transformation caused by Jahn-Teller (JT) distortion, the disproportionation reaction of Mn3+ and the dissolution of Mn. The relatively low LMO capacity is because only one Li is embedded in the Mn2O4 spinel framework during discharge. Theoretically speaking, the second lithium ion is inserted into the octahedral vacancies in the LMO (below 3V) to form an excessively inserted Li2Mn2O4 that can double the capacity, but this is difficult to achieve because it will cause Mn4+ to be reduced to Mn3+. It causes more serious Jahn-Teller distortion, resulting in irreversible phase transition (cubic phase to tetragonal phase) and particle cracks during the cycle. Therefore, in order to obtain the double capacity and excellent electrochemical performance of LMO, the key lies in how to suppress the serious Jahn-Teller distortion in the process of excessive lithium insertion.
2020-09-16 -
MoreWhat are the anode materials for lithium batteries?
Lithium battery anode materials are roughly divided into the following categories:
2020-09-15