18650 rechargeable battery lithium 3.7v 3500mah
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18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah

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Improve the treatment of Iron(II) phosphate lithium battery

release time:2023-10-07 Hits:     Popular:AG11 battery


  Therefore, increasing the bulk density and volume specific capacity of Iron(II) phosphate lithium has decisive significance for the practicability of Iron(II) phosphate lithium. The particle morphology, particle size and distribution of powder materials directly affect the packing density of materials. Therefore, people have studied the spherical direction of Iron(II) phosphate lithium materials. Research and practical applications have shown that spherical products not only have outstanding advantages such as high stacking density and large volume specific capacity, but also have excellent flowability, dispersibility, and processability, which are very conducive to the production of cathode material slurry and electrode coating, and improve the quality of electrode sheets; In addition, compared to irregular particles, the surface of regular spherical particles is easier to wrap a complete, uniform, and firm modification layer, so spherical products are more likely to further improve their comprehensive performance through surface modification.

  People conduct research on wet precursor pretreatment and secondary sintering. On this basis, carbon containing materials, transition element oxides, rare earth element oxides and other methods are added. Using ferrous salts or ferric salts, phosphoric acid or phosphate, and ammonia as raw materials, high-density spherical Iron(II) phosphate precursors are synthesized by controlled crystallization technology, and then mixed with lithium sources and carbon sources for heat treatment. Carbon doped high-density near spherical Iron(II) phosphate lithium is synthesized by carbothermal reduction method. The Iron(II) phosphate lithium powder material is composed of monodisperse spherical particles, and the particle size can reach 4.5-10 μ m. LiFePO4 cathode material with tamping density of 1.4-1.8g/cm3, reversible capacity of more than 150mAh/g and conductivity of 1 million times, which makes it possible for Iron(II) phosphate lithium material to be applied to high-capacity and high-power lithium ion batteries, and greatly promotes the industrialization of this material


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