# US 2026/0100359 A1 · Negative electrode and secondary battery including the same

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- Number: US 2026/0100359 A1
- Document ID: US20260100359A1
- Status: Published application
- Kind: A1
- Application number: 19/353,259
- Filed: 2025-10-08
- Published: 2026-04-09
- Earliest claimed: 2019-12-17
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Se Mi PARK; Yong Ju LEE; Su Min LEE; Dong Hyuk KIM
- Web page: https://patentgrep.com/patent/US20260100359A1

## CPC

- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/362: {Composites}
- H01M 4/364: {as mixtures}
- H01M 4/366: {as layered products}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/625: {Carbon or graphite}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided are a negative electrode, which includes a current collector and a negative electrode active material layer disposed on the current collector, wherein the negative electrode active material layer includes a conductive material, a negative electrode active material, and a binder, the negative electrode active material includes a silicon-based active material having a convexity of 0.8 or more as measured using a particle shape analyzer, and the convexity is defined by the following Formula 1, and a secondary battery including the negative electrode. Convexity ⁢ ( C x ) = Convex ⁢ hull ⁢ perimeter ⁢ ( P c ) / Actual ⁢ perimeter ⁢ ( P ) [ Formula ⁢ 1 ]

## Claims

### Claim 1

A negative electrode active material having:
a convexity of 0.8 or more and 0.97 or less as measured using a particle shape analyzer, and
the convexity is defined by the following Formula 1:
Convexity
=
Convex
⁢
hull
⁢
perimeter
/
Actual
⁢
perimeter
Formula
⁢
1
wherein the convex hull perimeter is a total length of sides of the smallest convex polygon that contains all surface roughness points of particles of the silicon-based active material measured from a two-dimensional image thereof.

### Claim 2 (depends on 1)

The negative electrode active material of claim 1, wherein the negative electrode active material has a convexity of 0.9 or more and 0.97 or less.

### Claim 3 (depends on 1)

The negative electrode active material of claim 1, wherein the negative electrode active material has a BET specific surface area of from 1 m2/g to 60 m2/g.

### Claim 4 (depends on 1)

The negative electrode active material of claim 1, wherein the negative electrode active material comprises a silicon-based active material.

### Claim 5 (depends on 4)

The negative electrode active material of claim 4, wherein the silicon-based active material includes a metal silicate phase including a metal silicate.

### Claim 6 (depends on 5)

The negative electrode active material of claim 5, wherein the metal silicate includes one or more selected from the group consisting of lithium, magnesium, calcium, aluminum, sodium, and titanium.

### Claim 7 (depends on 4)

The negative electrode of claim 4, wherein the silicon-based active material includes at least one of a material comprising Si or SiOx (0≤x≤2).

### Claim 8 (depends on 1)

The negative electrode active material of claim 1, wherein the negative electrode active material includes a carbon coating layer on a surface thereof.

### Claim 9

A negative electrode comprising a negative electrode active material,
the negative electrode active material has a convexity of 0.8 or more and 0.97 or less as measured using a particle shape analyzer, and
the convexity is defined by the following Formula 1:
Convexity
=
Convex
⁢
hull
⁢
perimeter
/
Actual
⁢
perimeter
Formula
⁢
1
wherein the convex hull perimeter is a total length of sides of the smallest convex polygon that contains all surface roughness points of particles of the silicon-based active material measured from a two-dimensional image thereof.

### Claim 10 (depends on 9)

A secondary battery comprising the negative electrode according to claim 9.