US12573671USUSPTO Grant XML

Solid state battery apparatus

Solid state battery apparatus are provided. The present disclosure relates to a solid state battery comprising a cell which comprises a cathode, an anode, and a solid electrolyte positioned between the cathode and the anode. The anode comprises first particles comprising silicon and second particles comprising a material configured to form an alloy with lithium. The second particles are substantially softer than the first particles and configured to compensate for size changes of the first particles during charging and discharging cycles of the solid state battery such that, as the first particles expand in size, the second particles are compressed in size at a given pressure applied to the solid state battery and further such that, as the first particles shrink in size, the second particles expand in size at a given pressure applied to the solid state battery.

Patent

Brief

Patent brief

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Novelty

The present disclosure relates to a solid state battery comprising a cell which comprises a cathode, an anode, and a sol...

Uses

Patent review

Assignee

LG ENERGY SOLUTION, LTD.

Published

Mar 10, 2026

Inventors

Jung-Pil Lee, Jiyoung Kim, Yuju Jeon, Dongju Lee, Zheng Chen

Domain

Mobility / storage

Plain-English summary

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

Solid state battery apparatus are provided.

Key novelty

The present disclosure relates to a solid state battery comprising a cell which comprises a cathode, an anode, and a solid electrolyte positioned between the cathode and the anode.

Applications

Patent review

Relevant search intents

1d9c77aa6f99

Claims preview

1 . A solid state battery comprising a cell which comprises: a cathode electrode; an anode electrode comprising an anode active material: first particles comprising silicon, and second particles comprising a tin-lithium alloy, wherein a weight concentration of tin in the tin-lithium alloy is greater than a weight concentration of lithium in the tin-lithium alloy; and a solid electrolyte positioned between the cathode electrode and the anode electrode and configured to enable transport of lithium ions between the cathode electrode and the anode electrode, wherein the solid electrolyte is in contact with at least a portion of the second particles, wherein the first particles and the second particles individually form discrete domains in the anode electrode as opposed to forming a combined domain comprising silicon and the material, wherein the second particles are substantially softer than the first particles and configured to compensate for size changes of the first particles during charging and discharging cycles of the solid state battery such that, as the first particles expand in size, the second particles are compressed in size at a given pressure applied to the solid state battery and further such that, as the first particles shrink in size, the second particles expand in size at a given pressure applied to the solid state battery, whereby the second particles generally maintain contact with one another and further with the first particles directly or indirectly, which allows the solid state battery to operate at a substantially lower pressure applied thereto than one that would be required in the absence of the second particles in the anode, wherein the second particles and the first particles form a bimodal distribution in the anode electrode, wherein the bimodal distribution is configured to reduce porosity of the anode electrode as the second particles are positioned in void space in a lattice of the first particles, the bimodal distribution increases surface contact during charging and discharging cycles of the solid state battery such that the second particles generally maintain contact with one another and further with the first particles directly or indirectly, which allows the solid state battery to operate at a substantially lower pressure applied thereto than one that would be required in the absence of the bimodal distribution in the anode, and wherein a pressure under 10 MPa is applied to the solid state battery. 2 . The solid state battery of claim 1 , wherein lithium ion diffusivity in the anode electrode ranges from 1 10 14 cm 2 /s to 1 10 7 cm 2 /s and wherein the anode electrode has a thickness, wherein the thickness changes less than 10% during the charging and discharging cycles at a given pressure applied to the solid state battery. 3 . The solid state battery of claim 1 , wherein the first particles have a first hardness in a range of 6 to 8 Mohs hardness values, wherein the second particles have a second hardness in a range of 1 to 4 Mohs hardness values.

Solid state battery apparatus

Plain-English summary

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