Lithium ion battery in-situ pre-lithiation method and lithium ion battery
An in-situ technology for lithium-ion batteries, applied in battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve the problems of fast capacity decay and low Coulombic efficiency, achieve improved cycle performance, simple process, The effect of increasing energy density
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[0030] The silicon-carbon composite material with an active silicon content of 15% is used as the negative electrode material, and the lithium-rich manganese-based material is 0.4Li 2 MnO 3 0.6Li(Ni 0.33 co 0.33 mn 0.33 )O 2 As the positive electrode material, N1 / P1=0.90 (N2 / P2 is 1.05) is designed, and a soft-packed lithium-ion battery with a winding structure is prepared.
[0031] Among them, the silicon-carbon composite material with an active silicon content of 15% has a first Coulombic efficiency of 85% and a reversible specific capacity (N2) of 850mAh / g in the voltage range of 5mV to 1.5V; the lithium-rich manganese-based material is 0.4Li 2 MnO 3 0.6Li(Ni 0.33 co 0.33 mn 0.33 )O 2 In the voltage range of 2.0-4.8V, the first Coulombic efficiency is 73%, and the reversible specific capacity (P2) is 230mAh / g.
[0032] The prepared lithium-ion battery is charged to a fully charged state in the first week at a voltage range of 2.0-4.7V and a rate of 0.1C. The desig...
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