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US 12,119,481 B2Granted
Negative electrode active material for secondary batteries and secondary battery
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYohei Uchiyama, Norihisa Yamamoto, Keita Okazaki
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Abstract
A negative electrode active material for a secondary battery includes silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase, the silicate phase is an oxide phase containing Si, O, and alkali metals, the alkali metals include at least Na and Li, and an atomic ratio: Na/Li of Na to Li is 0.1 to 7.1.
Claims9
A negative electrode active material for a secondary battery, comprising:
- silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase,
- wherein the silicate phase is an oxide phase which contains Si, O, and alkali metals,
- the alkali metals include at least Na and Li, and
- an atomic ratio:
- Na/Li of Na to Li is 0.1 to 7.1,
- wherein the silicate phase further contains Ca,
- wherein, in a cross-sectional SEM-EDX analysis of the negative electrode active material,
- a ratio:
- I(Ca/O) of an intensity which belongs to Ca to an intensity which belongs to O is 0.5 or less.
6 more elements
A secondary battery comprising:
- a positive electrode;
- a negative electrode;
- an electrolyte;
- and a separator provided between the positive electrode and the negative electrode,
- wherein the negative electrode includes a collector and a negative electrode active material layer, and
- the negative electrode active material layer contains a negative electrode active material comprising:
- silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase,
- wherein the silicate phase is an oxide phase which contains Si, O, and alkali metals,
- the alkali metals include at least Na and Li, and
- an atomic ratio:
- Na/Li of Na to Li is 0.1 to 7.1,
- wherein the silicate phase further contains Ca,
- wherein, in a cross-sectional SEM-EDX analysis of the negative electrode active material layer in a discharge state,
- a ratio:
- I(Ca/O) of an intensity which belongs to Ca to an intensity which belongs to O is 0.5 or less.
12 more elements
Dependencies are inferred from the claim text.