# US 12,119,493 B2 · Negative electrode and secondary battery including the same

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- Number: US 12,119,493 B2
- Document ID: US12119493B2
- Status: Granted
- Kind: B2
- Application number: 17/283,109
- Filed: 2019-10-14
- Published: 2021-12-09
- Granted: 2024-10-15
- Earliest claimed: 2018-10-12
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Hye Youn Lee; Ji Hye Park; Su Rim Lee
- Web page: https://patentgrep.com/patent/US12119493B2

## CPC

- H01M 4/364: {as mixtures}
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0562: Solid materials
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2300/0068: inorganic
- 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

A negative electrode and a secondary battery including the negative electrode, the negative electrode includes a negative electrode active material layer containing negative electrode active material particles and an additive. The additive is present in an amount of 1.8 parts by weight to 3.2 parts by weight based on 100 parts by weight of the negative electrode active material particles. The additive includes at least one selected from the group consisting of Li1+m1Alm1Ti2−m1(PO4)3, wherein 0<m1≤1, Li1+m2Alm2Ge2−m2(PO4)3, wherein 0<m2≤1, Li3m3La2/3−m3TiO3, wherein 0.2≤m3≤0.05, and Li3m4La2/3−m4ZrO3, wherein 0.2≤m4≤0.05 (LATP, LAGP, LLTO, and LLZO, respectively).

## Claims

### Claim 1

A negative electrode comprising:
a negative electrode active material layer comprising negative electrode active material particles and an additive,
wherein the negative electrode active material particles comprise artificial graphite and SiOx, wherein 0<x≤2,
wherein the additive is present in an amount of 1.8 parts by weight to 3.2 parts by weight based on 100 parts by weight of the negative electrode active material particles, wherein an average particle diameter (D50) of the additive is 0.8 μm to 5 μm, and
wherein the additive comprises at least one selected from the group consisting of Li1+m1Alm1Ti2-m1(PO4)3 (LATP), wherein 0<m1≤1, Li1+m2Alm2Ge2-m2(PO4)3 (LAGP), wherein 0<m2≤1, Li3m3La2/3-m3TiO3 (LLTO), wherein 0.05≤m3≤0.2, and Li3m4La2/3-m4ZrO3 (LLZO), wherein 0.05≤m4≤0.2.

### Claim 2 (depends on 1)

The negative electrode of claim 1, wherein the additive is present in an amount of 2 parts by weight to 2.5 parts by weight based on 100 parts by weight of the negative electrode active material particles.

### Claim 3 (depends on 1)

The negative electrode of claim 1, wherein the additive is LATP.

### Claim 4 (depends on 1)

The negative electrode of claim 1, wherein an average particle diameter (D50) of the additive is 0.8 μm to 2 μm.

### Claim 5 (depends on 1)

The negative electrode of claim 1, wherein the negative electrode active material particles comprise other particles that are silicon-based or graphite-based.

### Claim 6 (depends on 1)

The negative electrode of claim 1, wherein the negative electrode active material particles comprise SiOx, wherein x is 1.

### Claim 7 (depends on 1)

The negative electrode of claim 1, wherein the negative electrode active material particles are present in the negative electrode active material layer in an amount of 80 wt % to 97 wt %.

### Claim 8 (depends on 1)

The negative electrode of claim 1, wherein the negative electrode active material layer further comprises a conductive material.

### Claim 9 (depends on 1)

A secondary battery comprising:
the negative electrode of claim 1;
a positive electrode;
a separator interposed between the positive electrode and the negative electrode; and
an electrolyte.

### Claim 10 (depends on 1)

The negative electrode of claim 1, wherein an average particle diameter (D50) of the additive is 2 μm to 5 μm.