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(4) The electrolyte is generally an organic system, such as carbonate solvent dissolved with lithium hexafluorophosphate, and some polymer batteries use gel electrolyte;

(5) The battery shell is mainly divided into two types: hard shell (steel shell, aluminum shell, nickel plated iron shell, etc.) and soft shell (aluminum-plastic film).

When the battery is charged, lithium ions are detached from the positive electrode and embedded in the negative electrode, and vice versa during discharge. This requires an electrode to be in a lithium embedded state before assembly. Generally, a lithium embedded transition metal oxide with a potential greater than 3V relative to lithium and stable in air is selected as the positive electrode, such as LiCoO2, LiNiO2, LiMn2O4.

As negative electrode materials, lithium compounds that can be embedded with potentials as close as possible to the lithium potential are selected, such as various carbon materials including natural graphite, synthetic graphite, carbon fibers, intermediate phase small ball carbon, and metal oxides, including SnO, SnO2, tin composite oxide SnBxPyOz (x=0.4-0.6, y=0.6-0.4, z=(2+3x+5y)/2), etc.

The electrolyte is a mixed solvent system composed of alkyl carbonates such as ethylene carbonate (EC), propylene carbonate (PC), and low viscosity diethyl carbonate (DEC) prepared from LiPF6.

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