# US 12,224,433 B2 · Negative electrode for lithium secondary battery with improved safety or internal short, lithium secondary battery containing the same and lithium secondary battery system therefor

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- Number: US 12,224,433 B2
- Document ID: US12224433B2
- Status: Granted
- Kind: B2
- Application number: 18/436,819
- Filed: 2024-02-08
- Published: 2024-12-19
- Granted: 2025-02-11
- Earliest claimed: 2023-06-19
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Seong Kyu Lee; Suk Woo Lee; Jun Min Kim; Kyoung Min Choi
- Web page: https://patentgrep.com/patent/US12224433B2

## CPC

- H01M 4/366: {as layered products}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/463: {Aluminium based}
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/622: {being polymers}
- H01M 4/623: {fluorinated polymers}
- 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 10/441: {for several batteries or cells simultaneously or sequentially}
- H01M 10/448: {End of discharge regulating measures}
- H01M 10/486: {for measuring temperature}
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- 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

A negative electrode for a lithium secondary battery includes: a negative electrode active layer provided on at least one surface of a negative electrode current collector, and including a negative electrode active material; and a coating layer disposed on the negative electrode active layer. The coating layer contains silicon-containing particles, aluminum-containing particles and a dispersant, and a volume resistance of the coating layer is about 1.0×10−4 Ω·cm to 1.0 Ω·cm.

## Claims

### Claim 1

A negative electrode for a lithium secondary battery, the negative electrode comprising:
a negative electrode active layer provided on at least one surface of a negative electrode current collector, and including a negative electrode active material; and
a coating layer disposed on the negative electrode active layer,
wherein the coating layer contains silicon-containing particles, aluminum-containing particles and a dispersant, and
a volume resistance of the negative electrode is 1.0×10−4 Ω·cm to 1.0 Ω·cm.

### Claim 2 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein the negative electrode has the volume resistance of 3.0×10−3 Ω·cm to 9.0×10−1 Ω·cm.

### Claim 3 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the silicon-containing particles contain particles in which a ratio of a silicon element and an oxygen element is 1:0.5 to 2.0.

### Claim 4 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the aluminum-containing particles contain a metal compound represented by the following Formula 1:
AlpOq(OH)r [Chemical Formula 1]
in the Formula 1,
p is an integer of 1 to 10, q is an integer of 0 to 20, and p≤q, and
r is an integer of 1 to 5.

### Claim 5 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the aluminum-containing particles include one or more types of boehmite, pseudoboehmite, diaspore, akdalaite and aluminium trihydroxide.

### Claim 6 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the silicon-containing particles have an average particle size (D50) of 0.5 μm to 10 μm, and
the aluminum-containing particles have an average particle size (D50) of 0.1 μm to 3.0 μm.

### Claim 7 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the silicon-containing particles include a carbon layer on surfaces thereof.

### Claim 8 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the coating layer contains
1% to 30% by weight of silicon-containing particles;
30% to 89% by weight of aluminum-containing particles; and
10% to 40% by weight of dispersant relative to a total weight.

### Claim 9 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the dispersant includes:
a first dispersant including one or more carboxylic acids groups; and
a second dispersant including one or more amino groups.

### Claim 10 (depends on 1)

The negative electrode for the lithium secondary battery according to claim 1, wherein
the coating layer further includes one or more types of binders among styrene butadiene rubber (SBR), polyvinylidenefluoride (PVdF), polyacrylic acid (PAA), polyalkylacrylate, polyamide (PA) and polystyrene (PS).

### Claim 11 (depends on 1)

A lithium secondary battery comprising: a positive electrode, the negative electrode according to claim 1, and a separator disposed between the positive electrode and the negative electrode.

### Claim 12 (depends on 11)

The lithium secondary battery according to claim 11, wherein
the positive electrode includes a positive electrode active layer on a positive electrode current collector, the positive electrode active layer containing one or more types of positive electrode active materials among compounds represented by the following Formulas 2 and 3:
LiFeaM11-aXO4 [Chemical Formula 2]
Lix[NiyCozMnwMv2]O2
in the Formulas 2 and 3,
M1 is one or more types of W, Cu, Fe, V, Cr, Co, Ni, Mn, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, or Mo,
X is one or more of P, Si, S, As or Sb,
a satisfies 0<a≤1.0,
M2 is one or more types of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, or Mo, and
x, y, z, w and v satisfy 1.0≤x≤1.30, 0≤y<1, 0≤z≤1, 0≤w≤1, 0≤v≤0.1 respectively, and y+z+w+v=1.

### Claim 13 (depends on 11)

A lithium secondary battery system comprising:
a plurality of cell assemblies each including n lithium secondary batteries according to claim 11 where n is an integer of 3 to 100;
a charger/discharger electrically coupled to each of the cell assemblies to individually charge or discharge each of the cell assemblies;
a sensing unit electrically coupled to an electrode of each lithium secondary battery included in the cell assemblies to individually measure at least one type of electricity amount between an electric voltage and an electric current of each lithium secondary battery during charging/discharging of each lithium secondary battery; and
a control part electrically coupled to the charger/discharger and the sensor to control charging or discharging of each of the cell assemblies;
wherein when the electricity amount of a corresponding lithium secondary battery measured by the sensor satisfies a predetermined value, the control part stops charging or discharging of a cell assembly including the corresponding lithium secondary battery.

### Claim 14 (depends on 13)

The lithium secondary battery system according to claim 13, wherein the control part performs:
selecting a cell assembly having error rate of about 5% or more, in comparison between an average electricity amount of the cell assemblies and an electricity amount of an individual cell assembly;
among individual lithium secondary batteries provided in the corresponding cell assembly selected at the selecting, determining that an internal short has occurred in a corresponding lithium secondary battery having electricity amount measured by the sensor is lower than an applied electricity amount of each lithium secondary battery by about 0.5% or more; and
stopping charging or discharging of the cell assembly including the corresponding lithium secondary battery determined to be internally short-circuited.

### Claim 15 (depends on 13)

The lithium secondary battery system according to claim 13, wherein
the sensing unit further includes a temperature measurement sensor configured to measure a temperature of each lithium secondary battery provided in the cell assembly.

### Claim 16 (depends on 13)

A method of operating a lithium secondary battery system, the method comprising:
selecting a cell assembly having error rate of about 5% or more, in comparison between an average electricity amount of cell assemblies and an electricity amount of an individual cell assembly in a lithium secondary battery system according to claim 13;
among individual lithium secondary batteries provided in the corresponding cell assembly selected at the selecting, determining that an internal short has occurred in a corresponding lithium secondary battery having electricity amount measured by a sensor is lower than an applied electricity amount of each lithium secondary battery by about 0.5% or more; and
stopping charging or discharging of the cell assembly including the corresponding lithium secondary battery determined to be internally short-circuited.