Preparation method of metal lithium composite belt
A composite strip and metal lithium technology, which is applied in electrode manufacturing, final product manufacturing, sustainable manufacturing/processing, etc., can solve the lack of uniformity and compactness of deposited lithium, and the research on pulsed dynamic electrodeposition of lithium metal has not been reported yet. Unable to meet the development needs of lithium batteries and other issues, to achieve good electrochemical performance, promote electrochemical reactions, and high density effects
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Embodiment 1
The invention discloses a method for preparing a metal-lithium composite tape. The soft-packed cell is used as the main material, a pulsed power source is applied, a constant potential stripping pulse and a deposition pulse are used for surface activation of the current collector, and a periodic commutation pulse is used for dynamic charging. Deposition, dismantling the soft-packed cell to obtain an ultra-thin lithium composite tape, including the following steps:
(1) Select the negative electrode current collector, the lithium-containing positive electrode, and the electrolyte to assemble the soft pack battery;
(2) using a potentiostatic stripping pulse and a potentiostatic deposition pulse to perform surface activation treatment on the negative electrode current collector of the pouch cell obtained in step (1);
(3) Periodically commutating pulse dynamic electrodeposition is performed on the soft-wrapped cell obtained in step (2);
(4) Disassemble the soft-packed cell afte...
Embodiment 2
A silver-carbon copper foil with a thickness of 8 μm was used as the negative electrode current collector, a commercial lithium iron phosphate electrode was used as the lithium-containing positive electrode, and the electrolyte was composed of 1 mol / L LiPF 6 It is prepared by dissolving in a mixed solution with a mass ratio of EC:DMC of 1:1. The negative electrode current collector, the lithium-containing positive electrode and the electrolyte are assembled into a soft-packed battery cell.
[0025] A potentiostatic stripping pulse with an amplitude of 1 V and a duration of 10 s and a potentiostatic deposition pulse with an amplitude of -1 V and a duration of 10 s were used to generate pits as Li nucleation sites in advance, and the negative current collectors were surface-actively treated.
[0026] adopted after figure 1 Periodic commutation pulses shown for dynamic electrodeposition, where i f =i r =0.05A, t f,on =t f,off =200ms, n f =100, T f =400ms; t r,on =1ms t r...
Embodiment 3
A nickel foil with a thickness of 20 μm was used as the negative electrode current collector, metal lithium was used as the lithium-containing positive electrode, and the electrolyte was composed of 1 mol / L LiPF 6It is prepared by dissolving in a mixed solution with a mass ratio of FEMC:FEC of 1:1. The negative electrode current collector, the lithium-containing positive electrode and the electrolyte are assembled into a soft-packed battery cell.
[0028] A potentiostatic stripping pulse with an amplitude of 1 V and a duration of 30 s and a potentiostatic deposition pulse with an amplitude of -1 V and a duration of 30 s were used to generate pits as lithium nucleation sites in advance, and the negative current collectors were surface-actively treated.
[0029] adopted after figure 1 Periodic commutation pulses shown for dynamic electrodeposition, where i f =i r =0.5A, t f,on =t f,off =20ms, n f =10, T f =40ms;t r,on =4ms t r,off =40ms, n r =4,T r =80ms; T=120ms, T ...
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Abstract
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