US 2022/0069340 A1 · CERAMIC-SOFT COMPOSITES FOR SOLID-STATE SILICON ANODES

Abstract

An anode composite (AC) for use in an anode for solid-state lithium batteries includes particles of a silicon active material, a carbon additive for electrical conductivity, and a solid electrolyte that combines solid elastic electrolyte (SEE) with a solid non-elastic electrolyte. The solid non-elastic electrolyte is a lithium thiophosphate or other ceramic lithium ion conductor and the SEE includes an ammonium or phosphonium ion closo-borate doped with a lithium salt. The SEE is diffused onto the combined particles uniformly by heating, where pressing achieves about 100% relative density at modest pressures. The anode displays high stability upon charge-discharge cycles of a solid-state lithium battery prepared with the AC layer, appearing to maintain stable intrinsic and extrinsic interfaces.

Claims20

Dependent claims

An anode composite (AC) for storage and release of lithium, comprising:

a plurality of silicon particles;
a plurality of carbon particles;
and
a plurality of solid electrolyte particles comprising a solid elastic electrolyte (SEE) and a solid non-elastic electrolyte, wherein the solid non-elastic electrolyte comprises lithium ion, and wherein the silicon particles, the carbon particles, and the solid electrolyte particles are uniformly dispersed;
and wherein the SEE is diffused throughout the AC.

2 more elements

A lithium battery comprising:

an anode composite (AC) comprising:
from about 20 to about 80 weight % silicon particles;
from about 5 to about 30 weight % carbon particles;
and
from about 20 to about 50 weight % solid electrolyte particles, wherein the solid electrolyte particles comprise:
an soft elastic electrolyte (SEE);
and
a solid non-elastic electrolyte, wherein the solid non-elastic electrolyte comprises lithium ion, wherein the silicon particles, the carbon particles, and the solid electrolyte particles are uniformly dispersed in the AC, and wherein the SEE is diffused throughout the AC.

5 more elements

A method of preparing an anode, the method comprising:

combining a plurality of silicon particles, a plurality of carbon particles, and a plurality of solid electrolyte particles to form a combined powder, the solid electrolyte particles comprising a soft elastic electrolyte (SEE) and a solid non-elastic electrolyte;
grinding or milling the combined powder to form an anode composite (AC) powder;
heating the AC powder to a temperature of between a melting point of the SEE and a crystallization temperature of the solid non-elastic electrolyte;
and
pressing the AC powder to form the anode as an AC layer with a relative density of about 100%.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/004,496Filed 27 Aug 2020

Published

3 Mar 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification19 codes

H01M 4/133
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 10/0562
The electrolyte being constituted of inorganic materials only: solid materials
H01M 4/043
Processes of manufacture in general: involving compressing or compaction
H01M 4/0471
Processes of manufacture in general: involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal…

Ceramic-soft composites for solid-state silicon anodes

Life of this patent

Ceramic-soft composites for solid-state silicon anodes

Life of this patent

Abstract

Claims20