The invention relates to the technical field of
lithium batteries, in particular to a preparation method of a composite modified
lithium metal soft
package battery, which comprises the following steps: in the
assembly process of the soft
package lithium battery, placing microporous
copper foils between a
metal lithium
alloy negative
electrode and a diaphragm, and placing the
metal lithium
alloy negative
electrode in two microporous
copper foils; the two microporous
copper foils being jointly connected to the
nickel tab, the microporous copper foils forming a
physical protection effect on the
lithium metal negative
electrode, and arranging the positive plate on the other side of the diaphragm; and inhibiting the growth of
lithium metal dendrites by adopting the carbon-coated diaphragm. Themicroporous
copper foil modified metal lithium
alloy negative electrode provided by the invention realizes good application in a
lithium battery, the modification method is simple and easy to implement, the control requirement is low,
mass production is easy, no special test environment or special device investment is needed, an original
lithium battery production line and equipment can be utilized, a production
system does not need to be modified, meanwhile, the electrochemical performance of the metal lithium alloy negative electrode can be improved, and the electrochemical
cycling stabilityis improved.