Preparation method of negative pole piece of lithium battery
A negative electrode pole piece, lithium battery technology, applied in the direction of electrode manufacturing, battery electrodes, lithium batteries, etc., can solve volume expansion and other problems, achieve the effects of reducing production costs, solving volume expansion, and improving charge and discharge performance and capacity
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[0029] The invention provides a method for preparing a negative pole piece of a lithium battery, comprising the following steps:
[0030] ① Preparation of tin-based alloy plating solution: first add the complexing agent into the water to obtain a complexing agent solution, then add tin salt, reducing agent, grain refiner, dispersant and metal salt to the complexing agent solution in sequence, Stir evenly to obtain a tin-based alloy plating solution;
[0031] ② Copper foil current collector pretreatment: first immerse the copper foil in the chemical degreasing solution, then wash the copper foil with tap water and deionized water in sequence, then immerse the cleaned copper foil in the activation solution as a whole, and finally use Clean the copper foil with tap water and deionized water to obtain a copper foil current collector;
[0032] ③Electrodeposited tin-based alloy / silicon-based particle composite coating: first add silicon-based particles to the tin-based alloy platin...
Embodiment
[0043] ① First add the complexing agent into the water to obtain a complexing agent solution, then divide the complexing agent solution into two parts on average, add tin salt and nickel salt to one part, add reducing agent, grain refiner, dispersing agent in sequence Add the tin-nickel alloy plating solution, add tin salt and copper salt to the other part, add the reducing agent, grain refiner, and dispersant in turn, and stir evenly to obtain the copper-tin alloy plating solution.
[0044] ②Immerse the copper foil in a chemical degreasing solution at a temperature of 70°C for 5 minutes, then wash it with tap water and deionized water in sequence, and then immerse the cleaned copper foil as a whole in an activation solution at room temperature for degreasing. Activated for 2 minutes, and finally washed with tap water and deionized water in sequence to obtain a copper foil current collector.
[0045] ③ First, add nano-silicon particles to the tin-nickel alloy plating solution ...
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