Anode active material and battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTetsuya Waseda, Satoshi Wakasugi, Jun Yoshida, Masaki Adachi
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Abstract
A main object of the present disclosure is to provide an anode active material whose volume variation due to charging and discharging is small. The present disclosure achieves the object by providing an anode active material comprising a primary particle including a Si phase, an MSi phase that is a silicide phase wherein M is a transition metal element, and a first void.
Claims7
A battery comprising a cathode active material layer, an anode active material layer, and an electrolyte layer formed between the cathode active material layer and the anode active material layer, wherein
- the anode active material layer includes an anode active material,
- the anode active material comprises a primary particle including a Si phase, a MSi phase that is a silicide phase wherein M is a transition metal element, and a first void,
- a cross-section of the primary particle comprises a sea-island structure wherein the Si phase is the sea and the silicide phase (MSi phase) is the island,
- the transition metal element is at least one selected from the group consisting of Cr, Ti, Zr, Hf, and Os,
- the anode active material is an aggregate of a plurality of primary particles, and is a secondary particle including a second void, and
- when a thickness of the anode active material layer in a stacked direction is a α μm, and an average particle size of the secondary particle is β μm, β/α is 0.02 or more and 0.5 or less, determined by SEM.
Dependencies are inferred from the claim text.