Lithium-ion battery and method of manufacturing the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsAkira TSUJIKO, Hiroki IGUCHI
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Abstract
The lithium-ion battery includes a positive electrode, a negative electrode, and an electrolyte. The negative electrode contains a negative electrode active material. The negative electrode active material contains a silicon material. The silicon material contains a silicon alloy phase and a silicate phase. The silicon alloy phase has a three-dimensional network structure. The silicate phase is arranged in a mesh of the three-dimensional network structure. The three-dimensional network structure has an average mesh size of 2.8 nm to 3.5 nm.
Claims4
A lithium-ion battery comprising:
- a positive electrode;
- a negative electrode;
- and
- an electrolyte, wherein:
- the negative electrode contains a negative electrode active material;
- the negative electrode active material contains a silicon material;
- the silicon material contains a silicon alloy phase and a silicate phase;
- the silicon alloy phase has a three-dimensional network structure;
- the silicate phase is arranged in a mesh of the three-dimensional network structure;
- and
- the three-dimensional network structure has an average mesh size of 2.8 nm to 3.5 nm.
A manufacturing method of a lithium-ion battery comprising:
- assembling the lithium-ion battery;
- and
- performing an initial charging on the lithium-ion battery, wherein:
- the lithium-ion battery includes a positive electrode, a negative electrode, and an electrolyte;
- the negative electrode contains a negative electrode active material;
- the negative electrode active material contains a precursor of a silicon material;
- the precursor has a composition represented by SiOx where a relationship of 0<x<2 is satisfied;
- the initial charging includes a first step and a second step;
- in the first step, the charging is performed to an intermediate voltage at a first current rate;
- in the second step, the charging is performed from the intermediate voltage to a maximum voltage at a second current rate;
- the first current rate is lower than 0.5 C;
- the second current rate is higher than the first current rate;
- and
- the intermediate voltage is 3.75 V or higher.
Dependencies are inferred from the claim text.