Power storage device

摘要

A power storage device a positive electrode including a positive electrode active material layer and a negative electrode including a negative electrode active material layer. The positive electrode active material layer includes a plurality of particles of x[Li2MnO3]-(1−x)[LiCo1/3Mn1/3Ni1/3O2] (obtained by assigning 0.5 to x, for example) which is a positive electrode active material, and multilayer graphene with which the plurality of particles of the positive electrode active material are at least partly connected to each other. In the multilayer graphene, a plurality of graphenes are stacked in a layered manner. The graphene contains a six-membered ring composed of carbon atoms, a poly-membered ring which is a seven or more-membered ring composed of carbon atoms, and an oxygen atom bonded to one or more of the carbon atoms in the six-membered ring and the poly-membered ring, which is a seven or more-membered ring.

主权项

1. A power storage device comprising:
a positive electrode including a positive electrode active material layer; and a negative electrode including a negative electrode active material layer, wherein the positive electrode active material layer comprises a first particle and a second particle, each of the first particle and the second particle comprising x[Li2MnO3]-(1−x)[LiCo1/3Mn1/3Ni1/3O2] which is a positive electrode active material, and multilayer graphene bonding the first particle and the second particle, wherein the multilayer graphene has oxygen at a concentration of 3 atomic % to 10 atomic %, wherein in the multilayer graphene, a plurality of graphenes are stacked in a layered manner, and wherein the plurality of graphenes each comprise a six-membered ring composed of carbon atoms, a poly-membered ring which is a seven or more-membered ring composed of carbon atoms, and an oxygen atom bonded to one or more of the carbon atoms in the six-membered ring and the poly-membered ring.