A kind of high-efficiency lithium-ion battery and its manufacturing method
A technology of lithium-ion battery and manufacturing method, which is applied in the field of high-efficiency lithium-ion battery and its manufacturing, can solve the problem of low initial charging and discharging efficiency of silicon carbon negative electrode, and achieve the effect of improving the first charging and discharging efficiency
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Embodiment 1
[0033] A high-efficiency lithium-ion battery and a manufacturing method thereof, the manufacturing method steps are as follows:
[0034] (1) Homogenize 650mAh / g silicon carbon powder, conductive agent SP, hydroxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) according to the mass ratio of 90:5:2.5:2.5. Coating on copper foil, one side coating surface density is 2mg / cm 2 , made of silicon-based negative electrode;
[0035] (2) In a glove box where the water vapor content is controlled to be less than 1ppm and the oxygen content is less than 1ppm, use an electrolysis device equipped with a lithium-intercalated electrolyte, use a metal lithium sheet as a counter electrode, and a silicon-based negative electrode as a working electrode. Electrodeposit lithium metal;
[0036] (3) Electrodeposition of metal lithium: In lithium intercalation electrolyte, pre-lithiation treatment is performed by two-step constant current pulse deposition method:
[0037] (a) at 4mA / cm 2 ...
Embodiment 2
[0048] A high-efficiency lithium-ion battery and a manufacturing method thereof, the steps are as follows:
[0049] (1) Homogenize 650mAh / g silicon carbon powder, conductive agent SP, hydroxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) according to the mass ratio of 90:5:5:5. Coating on copper foil, one side coating surface density is 2mg / cm 2 , made of silicon-based negative electrode;
[0050](2) In a glove box where the water vapor content is controlled to be less than 1ppm and the oxygen content is less than 1ppm, use an electrolysis device equipped with a lithium-intercalated electrolyte, use a metal lithium sheet as a counter electrode, and a silicon-based negative electrode as a working electrode. Electrodeposit lithium metal;
[0051] (3) Electrodeposition of metal lithium: In lithium intercalation electrolyte, pre-lithiation treatment is performed by two-step constant current pulse deposition method:
[0052] (a) at 2mA / cm 2 The current density is con...
Embodiment 3
[0063] A high-efficiency lithium-ion battery and a manufacturing method thereof, the steps are as follows:
[0064] (1) Homogenize 650mAh / g silicon carbon powder, conductive agent SP, hydroxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) according to the mass ratio of 90:5:1:1. Coating on copper foil, one side coating surface density is 2mg / cm 2 , made of silicon-based negative electrode;
[0065] (2) In a glove box where the water vapor content is controlled to be less than 1ppm and the oxygen content is less than 1ppm, use an electrolysis device equipped with a lithium-intercalated electrolyte, use a metal lithium sheet as a counter electrode, and a silicon-based negative electrode as a working electrode. Electrodeposit lithium metal;
[0066] (3) Electrodeposition of metal lithium: In lithium intercalation electrolyte, pre-lithiation treatment is performed by two-step constant current pulse deposition method:
[0067] (a) at 8mA / cm 2 The current density, cont...
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