-(2)How to improve the high rate performance of lithium batteries?

(2)How to improve the high rate performance of lithium batteries?
author:enerbyte source:本站 click345 Release date: 2023-11-01 09:05:05
abstract:
The niobium titanium oxide NTO new negative electrode material developed by Toshiba Corporation in Japan has a reversible capacity of 341mAh/g, which is much higher than LTO material and close to graphite material. However, with the advantage of high pressure solid density, the volume energy d...

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The niobium titanium oxide NTO new negative electrode material developed by Toshiba Corporation in Japan has a reversible capacity of 341mAh/g, which is much higher than LTO material and close to graphite material. However, with the advantage of high pressure solid density, the volume energy density of the material reaches twice that of graphite negative electrode, while also retaining the characteristics of fast charging.

② Formula optimization

Another key factor determining the rate performance of lithium-ion batteries lies in the formulation design of the battery. There are two forms of conductivity within the lithium-ion battery, namely ion conductivity and electronic conductivity. The important form of ion conductivity includes the diffusion of Li+in the electrolyte, internal pores of the electrode, and internal pores of the active substance. The important form of electronic conductivity is the conductivity between particles of the active substance.

The high rate performance of lithium-ion batteries is a comprehensive reflection of several conductive forms. When the compaction density is too high, it will cause a sharp decrease in electrode porosity, leading to an increase in ion diffusion impedance. However, when the compaction density is low, it will lead to an increase in contact impedance. Therefore, only an appropriate compaction density can ensure the excellent rate performance of lithium-ion batteries while also taking into account the characteristics of high energy density.

③ Selection of battery structure

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