Composite modified layer and anode-free lithium metal battery thereof
Present invention is related to a composite modified layer attached on a current collector comprising a lithiophilic particle being covered or coated by a polymer layer. The composite modified layer further could be coated with an additional carbon layer or artificial protective film as several suitable embodiments presented in this invention. The lithiophilic particle, such as sliver nano-particle, will firstly form a lithium-silver alloys to reduce a thermodynamic instability during the growth of lithium nuclei. The sliver nano-particle is able to be attached securely on the current collector by the polymer with high adhesion ability. The fuel cell including the composite modified layer in the present invention has higher average Coulombic efficiency and higher capacity retention.
1. An anode-free lithium metal battery comprises:
a current collector, wherein the current collector has a first surface and a second surface opposite the first surface; and
a dual layer assembly attached to the first surface of the current collector,
the dual layer assembly comprising:
a composite modified layer directly attached to the first surface of the current collector, the composite modified layer comprising multiple silver nano-particles and a polydopamine layer, wherein the composite modified layer has a thickness in a range of 1-50 μm; and
an artificial solid electrolyte interface attached on a surface of the polydopamine layer of the composite modified layer, wherein the artificial solid electrolyte interface is a graphene oxide layer.
2. The anode-free lithium metal battery as claimed in claim 1 , wherein:
the metal of the first surface of the current collector comprises one or a combination of Copper, Silver, Nickel, Platinum, Gold or stainless steel.
3. The anode-free lithium metal battery as claimed in claim 2 , wherein the composite modified layer further comprises an artificial protective layer attached onto the surface of the polydopamine, wherein the artificial protective layer is a mixture or a composite of Polyvinylidene fluoride-hexafluoropropylene copolymer with lithium bis(trifluoromethanesulfonyl)imide.
4. The anode-free lithium metal battery as claimed in claim 3 , wherein the mass ratio of Polyvinylidene fluoride-hexafluoropropylene copolymer with lithium bis(trifluoromethanesulfonyl)imide is at a range from 5:1 to 5:3.