LR41 battery

Three technologies to improve the voltage performance of LR41 battery positive electrode materials

Increasing the voltage of lithium-ion battery positive electrode data is a new idea to improve the energy density of lithium-ion batteries in recent years. High-voltage data includes two types of positive electrode data: spinel crystal structure and olivine crystal structure. LiMPO4 (M = Co, Ni) is a typical high-voltage olivine crystal structure. Among them, the discharge potential of LiCoPO4 is 4.8v, the discharge potential of LiNiPO4 is 5.2v, and the theoretical capacity is close to 170mAh/g.

5.2v is the highest charge and discharge voltage at present. Because there is no electrolyte competition, there is no reported lithium-ion battery function LiNiPO4 positive electrode data. There are more LiCoPO4 data reports, but the cyclic charge and discharge performance of LiCoPO4 data is poor in the current electrolyte system.

The side effects of olivine crystal structure under high pressure are important: 1. The positive electrode data reacts with the electrolyte to form a solid-liquid interface layer; 2.2. The electrolyte will partially dissolve the Co ions, seriously affecting the cyclic charge and discharge performance of the lithium-ion battery; 3. Poor conductivity and low conductivity. Therefore, the selection of high-pressure olivine crystal structure must perform necessary technology to improve its function, and there are three technologies.

1. Nanotechnology. Nanoparticles used for active materials have shorter lithium ion and electron transfer and diffusion pathways than micron-sized particles.

2. Doping. Unlike spinel crystal structure, which can be doped with cations and anions at the same time, olivine crystal structure can only improve the conductivity of positive electrode data by doping with cations.

3. Coating. Amorphous carbon coating can form interconnected electron high-speed transmission channels, thereby improving its function, especially the first discharge capacity and charge and discharge cycle function.

LiMPO4 In general, olivine crystal structure (M = Co, Ni) has more theoretical capabilities than spinel crystal structure, but due to low conductivity and poor blood circulation function, the developed lithium-ion battery positive electrode material does not have the research achievements of spinel crystal structure lithium-ion battery, and the input to the stage of industrialization needs to be more advanced. Functional transformation into skills, the first is electric vehicle power lithium-ion battery.

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