All-solid-state battery
Provided is an all-solid-state battery that utilizes a precipitation-dissolution reaction of metallic lithium as a reaction of a negative electrode. The all-solid-state battery has a negative electrode current collector, a Li storage layer containing a fibrous carbon material and a resin, a metal M layer capable of being alloyed with lithium, a solid electrolyte layer, and a positive electrode layer in this order.
1. An all-solid-state battery that utilizes a precipitation-dissolution reaction of metallic lithium as a reaction of a negative electrode, the battery comprising, in the following order:
a negative electrode current collector;
a Li storage layer containing a fibrous carbon material and a resin;
a Li-M alloy layer containing an alloy of lithium and a metal M;
a solid electrolyte layer; and
a positive electrode layer;
wherein the metal M is metallic magnesium and an amount of the fibrous carbon material is larger than an amount of the resin.
2. The all-solid-state battery according to claim 1 , wherein a thickness of the Li storage layer is 3 μm or more and 33 μm or less.
3. The all-solid-state battery according to claim 2 , wherein a thickness of the metal M layer is 100 nm or more and 5 μm or less.
4. The all-solid-state battery according to claim 1 , wherein a thickness of the metal M layer is 30 nm or more and 5 μm or less.
5. The all-solid-state battery according to claim 4 , wherein a thickness of the metal M layer is 100 nm or more and 5 μm or less.
6. The all-solid-state battery according to claim 1 , wherein a proportion of Li in the Li-alloy is 30.0 atomic % or more and 99.8 atomic % or less in a state where the all-solid-state battery is fully charged.
7. The all-solid-state battery according to claim 1 , wherein the fibrous carbon material is vapor grown carbon fiber and the resin is polyvinylidene fluoride.
8. The all-solid-state battery according to claim 1 , wherein the negative electrode current collector is in contact with the Li storage layer.