KR20200034692A - Negative electrode material for rechargeable lithium battery, method for manufacturing the same, and rechargeable lithium battery including the same - Google Patents

Abstract

The present invention relates to a negative electrode active material for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery using the same. According to an embodiment of the present invention, provided is a negative electrode active material for a lithium secondary battery, which is a graphite material including secondary particles, wherein the secondary particles are formed as a plurality of primary particles are agglomerated, and the primary particles are isotropic cokes having a thermal expansion index (CTE) of 20X10^(-7)/°C or higher.

Description

A negative electrode active material for a lithium secondary battery, a method for manufacturing the same, and a lithium secondary battery comprising the same

One embodiment of the present invention relates to a negative electrode active material for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery comprising the same.

As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing. Among such secondary batteries, lithium secondary batteries exhibiting high energy density and operating potential, long cycle life, and low self-discharge rate have been commercialized and widely used.

A lithium secondary battery is generally a secondary battery composed of a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator, and an electrolyte, and charging and discharging by intercalation-deintercalation of lithium ions. Lithium secondary batteries have a high energy density, a large electromotive force, and have the advantage of exerting a high capacity, and thus have been applied to various fields.

A metal oxide such as LiCoO ₂ , LiMnO ₂ , LiMn ₂ O ₄ or LiCrO ₂ is used as the positive electrode active material constituting the positive electrode of the lithium secondary battery. As the negative electrode active material constituting the negative electrode, a metal based material such as metal lithium, graphite or activated carbon, or a material such as silicon oxide (SiO _x ) is used.

Among the negative electrode active materials, metal lithium was mainly used initially, but as charging and discharging cycles progress, lithium atoms grow on the surface of the metal lithium to damage the separator and damage the battery. Recently, carbon-based materials are mainly used.

In addition, although the graphite-based material exhibits excellent capacity preservation characteristics and efficiency, it is still somewhat insufficient to provide theoretical characteristics of high energy and high power density required in related markets. In addition, in the case of graphite, there is a problem in that adhesive strength is reduced when forming an electrode, and thus it is difficult to reach a satisfactory level of life characteristics and impact resistance.

Therefore, it is necessary to develop a new technology that can make use of the advantages of using graphite, but can solve the disadvantages.

Accordingly, a high-end market is being formed around artificial graphite, which has a long service life based on structural stability. As the main raw material of artificial graphite, expensive needle coke is used, but there is difficulty in stable procurement due to the uncertainty of supply competition and supply competition between enterprises.

One embodiment of the present invention is to provide a negative electrode active material for a lithium secondary battery using isotropic coke.

In some embodiments towing negative active material of the present invention is a back black yeonjaeyi comprising the secondary particles, the secondary particles have a plurality of primary particles agglomerated, the primary particles have a thermal expansion index (CTE) is 20X10 ^{- And} isotropic coke of ⁷ / ° C or higher.

The specific surface area (BET) of the negative electrode active material for a lithium secondary battery may be 1 to 4 m ² / g or less.

The degree of graphitization of the negative active material for a lithium secondary battery may have an XRD value based on a d (002) plane of 3.350 to 3.365 kPa.

In another embodiment of the present invention, a method of manufacturing a negative electrode active material for a lithium secondary battery includes preparing isotropic coke as primary particles, mixing secondary particles with a binder and a catalyst to produce secondary particles, and secondary Carbonizing the particles, and graphitizing the carbonized secondary particles, the thermal expansion index (CTE) of the isotropic coke may be 20X10 ^-7 / ℃ or more.

The thermal expansion index (CTE) of the isotropic coke may be 20 to 40X10 ^-7 / ℃.

The particle diameter (D50) of the isotropic coke may be 5 to 10㎛.

The catalyst includes Si, a Si compound, or a combination thereof, and the particle diameter (D50) of the catalyst may be 60 μm or less (excluding 0 μm).

In the step of preparing secondary particles by mixing the primary particles and the binder, the secondary particles are kneaded with a binder: 20 to 80 parts by weight, and a catalyst: 5 to 30 parts by weight with respect to 100 parts by weight of the primary particles Can be produced.

The binder may be coal tar, petroleum-based pitch, coal-based pitch, or a combination thereof, and the softening point of the binder may be 90 to 250 ° C.

The step of preparing the secondary particles by mixing the primary particles and the binder may be performed at a softening point or higher of the binder.

The step of carbonizing the secondary particles may be performed at 800 to 1500 ° C.

The step of graphitizing the carbonized secondary particles may be performed at 2600 to 3200 ° C.

The step of preparing the secondary particles by kneading the primary particles with the binder and the catalyst may further include molding the kneaded secondary particles.

The step of preparing the secondary particles by kneading the primary particles with the binder and the catalyst may further include disintegrating the kneaded secondary particles.

In another embodiment of the present invention, a lithium secondary battery may provide a positive electrode, a negative electrode including a negative electrode active material for a lithium secondary battery according to one embodiment of the present invention described above, and a lithium secondary battery including an electrolyte.

According to one embodiment of the present invention, an anode active material using isotropic coke may be prepared. Specifically, even using an isotropic coke, which was evaluated as low quality, a negative electrode active material for a lithium secondary battery can be manufactured, and accordingly, the performance of the secondary battery may be excellent.

1 is a lithium secondary battery according to Example 1 observed by SEM.
2 is a lithium secondary battery according to Example 2 observed by SEM.
3 is a lithium secondary battery according to Example 3 observed by SEM.
4 is a lithium secondary battery according to a comparative example observed by SEM.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and are conventional in the art to which the present invention pertains. It is provided to fully inform the knowledgeable person of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Thus, in some embodiments, well-known techniques are not specifically described to avoid obscuring the present invention. Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by a person having ordinary skill in the art to which the present invention pertains. When a part of the specification "includes" a certain component, this means that other components may be further included rather than excluding other components, unless specifically stated to the contrary. Also, the singular form includes the plural form unless otherwise specified in the phrase.

In some embodiments towing negative active material of the present invention is a back black yeonjaeyi comprising the secondary particles, the secondary particles have a plurality of primary particles agglomerated, the primary particles have a thermal expansion index (CTE) is 20X10 ^- It is possible to provide a negative electrode active material for a lithium secondary battery that is isotropic coke of ⁷ / ° C or higher.

Specifically, the specific surface area (BET) of the negative electrode active material for a lithium secondary battery may be 1 to 4 m ² / g or less.

The degree of graphitization of the negative active material for a lithium secondary battery may have an XRD value based on a d (002) plane of 3.350 to 3.365 kPa.

Another embodiment of the present invention, a method of manufacturing a negative electrode active material for a lithium secondary battery comprises preparing isotropic coke as primary particles; Kneading the primary particles with a binder and a catalyst to produce secondary particles; Carbonizing the secondary particles; And graphitizing the carbonized secondary particles.

First, a step of preparing isotropic coke as primary particles may be performed.

At this time, the thermal expansion index (CTE) of the isotropic coke may be 20X10 ^-7 / ℃ or more. Specifically, it may be 22 to 40X10 ^-7 / ℃.

At this time, coke having uniform directionality of tissue may be referred to as isotropic coke. In addition, a coefficient of thermal expansion (CTE) can be used as an indicator of the isotropy of coke.

More specifically, the thermal expansion index refers to a phenomenon in which a substance receives heat and becomes bulky. That is, that the thermal expansion index according to the embodiment of the present invention is in the above range means that the tendency of randomization of the orientation degree of the material has a structure suitable for insertion / release during charging and discharging of Li ions.

Accordingly, the rapid rate characteristic of the lithium secondary battery using coke according to one embodiment of the present invention may be better than when using coke of an anisotropic structure having a thermal expansion index of less than the above range.

The particle diameter (D50) of the isotropic coke may be 5 to 10㎛.

Specifically, when the particle size of the coke is within the above range, it is possible to express an excellent effect in terms of rate characteristics, discharge capacity, efficiency, and swelling when producing secondary particles.

Thereafter, the step of preparing the secondary particles by kneading the primary particles with the binder and the catalyst may be performed.

Specifically, the secondary particles may be prepared by kneading a binder: 20 to 80 parts by weight, and a catalyst: 5 to 30 parts by weight with respect to 100 parts by weight of the primary particles.

When the binder is added and kneaded by the above range, the granulation effect of the primary particles may be improved.

Further, the binder may be coal tar, petroleum-based pitch, coal-based pitch, or a combination thereof. However, it is not limited to this.

The softening point of the binder may be 90 to 250 ℃.

The step of preparing the secondary particles by kneading the primary particle, the binder, and the catalyst may be performed at a softening point or higher of the binder.

Specifically, by kneading at a softening point or higher of the binder, fluidity increases and kneading can be facilitated.

When the content of the catalyst is in the above range, the graphitization yield may be excellent.

In this case, the catalyst may be Si, a Si compound, or a combination thereof. Specifically, it may be Si, SiO, SiO ₂ , SiC, or a combination thereof.

The particle diameter (D50) of the catalyst may be 60 μm or less (excluding 0 μm).

When the particle diameter of the catalyst is within the above range, the graphitization effect may not be uniform when producing secondary particles.

After the step of preparing the secondary particles by kneading the primary particles with the binder and the catalyst, the step of forming the secondary particles may be further included.

Specifically, the secondary particles may be uniaxially molded. Uniaxial molding may be a method of molding by pressing through vertical pressing in a cylindrical mold.

At this time, the pressure may be 50 to 100 MPa. More specifically, it may be 70 to 100MPa. More specifically, it may be 90 to 98MPa.

By further performing the molding step as described above, the catalyst can be maintained in a uniform composition state. Accordingly, the catalytic graphitization effect can be easily expressed.

However, the molding process is not an essential process, and may be performed as necessary.

The step of preparing the secondary particles by kneading the primary particles with the binder and the catalyst may further include disintegrating the kneaded secondary particles.

Specifically, performing the disintegration process as described above is to release the powders entangled in the van der Waals bond in the previous step.

Thereby, the powdering characteristics of the secondary particles in the form where the primary particles are assembled can be improved.

In addition, the disintegration step may be carried out after the carbonization step or graphitization step, which will be described later. However, it is not necessarily carried out and can be carried out as necessary.

Thereafter, the step of carbonizing the secondary particles may be performed.

Specifically, it can be carbonized at 800 to 1500 ° C. More specifically, it can be carbonized at 1000 to 1300 ° C.

The carbonization step may be performed for 1 to 3 hours.

At this time, the heating rate up to the temperature may be 5 to 20 ° C / min. More specifically, it may be 5 to 15 ℃ / min. More specifically, it may be 5 to 10 ℃ / min. It is possible to minimize structural changes by slowly raising the temperature at the above speed.

Accordingly, when carbonization is performed under the above conditions, it is possible to control the weight of volatile matter to 5% or less with respect to 100% by weight of the secondary particles.

Specifically, in the graphitization process, the volatile component is controlled to a minimum, thereby contributing to improving the powder properties.

Accordingly, when the weight of the volatile component is controlled to 5% or less in the carbonization step, it is a level capable of removing all remaining volatile components by the graphitization step described later.

Finally, the step of graphitizing the carbonized secondary particles can be carried out.

Specifically, graphitization may be performed at 2600 to 3200 ° C. More specifically, graphitization may be performed at 2700 to 3000 ° C.

The graphitization step may be performed for 1 to 120 hours.

In addition, it is possible to increase the temperature at the same rate to maintain the structure in the carbonization step.

In another embodiment of the present invention, a positive electrode, a negative electrode, and an electrolyte, and the negative electrode provides a lithium secondary battery including a negative electrode active material prepared by the above-described method.

Specifically, the electrolyte is at least one selected from the group comprising fluoro ethylene carbonate (fluoro ethylene carbonate, FEC), vinylene carbonate (VC), ethylene sulfonate (ES), and combinations thereof It may be to further include the above electrolyte additives.

This is because the cycle characteristics can be further improved by additionally applying an electrolyte additive such as FEC, and a stable solid electrolyte interphase (SEI) can be formed by the electrolyte additive. This fact is supported by examples to be described later.

The negative electrode active material and thus the characteristics of the lithium secondary battery are as described above. In addition, the battery configuration other than the negative electrode active material is generally known. Therefore, detailed description will be omitted.

Hereinafter, it will be described in detail through examples. However, the following examples are merely illustrative of the present invention, and the contents of the present invention are not limited by the following examples.

Example 1

(1) Preparation of negative electrode active material

1 kg of isotropic coke with a coefficient of thermal expansion (CTE) of 37 to 40X10 ^-7 / ° C was prepared. In addition, 200 g of coal tar and 200 g of SiC having a particle diameter (D50) of 50 μm were prepared.

Thereafter, isotropic coke, coal tar, and a catalyst were kneaded at room temperature for 1 hour.

Subsequently, the temperature was raised at a rate of 10 ° C / min, and 100 g of a petroleum pitch was added at 250 ° C, followed by further kneading for 1 hour. At this time, the softening point of the petroleum pitch is 250 ° C. Subsequently, secondary particles were obtained by natural cooling at room temperature.

The secondary particles were crushed at a rate of 800 rpm / min to prepare a powder. At this time, a pin mill device was used.

After the powder was added to the carbonization furnace, the temperature was raised at a rate of 10 ° C / min and carbonized at 1200 ° C for 1 hour. Thereafter, the mixture was naturally cooled at room temperature.

It was confirmed through industrial analysis that the carbonized volatile matter (VM) was 3.5%.

Finally, the carbonized powder was heated at a rate of 10 ° C / min and graphitized at 2700 ° C for 1 day. Subsequently, a negative electrode active material for a lithium secondary battery was prepared by natural cooling at room temperature.

(2) Preparation of cathode

The negative electrode active material slurry was prepared by mixing 97% by weight of the prepared negative electrode active material, 2% by weight of a binder containing carboxy methyl cellulose and styrene butadiene rubber, and 1% by weight of the Super P conductive material in distilled water solvent.

The negative electrode active material slurry was applied to a copper (Cu) current collector, dried at 100 ° C. for 10 minutes, and pressed in a roll press. Thereafter, vacuum drying was performed in a vacuum oven at 100 ° C. for 12 hours to prepare a negative electrode.

After vacuum drying, the electrode density of the negative electrode was 1 to 2 g / cc.

(3) Preparation of lithium secondary battery

Lithium metal (Li-metal) is used as the negative electrode and the counter electrode prepared in (2), and the volume ratio of ethylene carbonate (EC, Ethylene Carbonate): dimethyl carbonate (DMC) is 1: 1 as the electrolyte. What dissolved 1 mol of LiPF ₆ solution in the mixed solvent of 1 person was used.

Using each of the above components, a half coin cell of 2032 coin cell type was manufactured according to a conventional manufacturing method.

Example 2

200 kg of coal-based pitch, 200 g of coal tar, and 200 g of SiC having a particle diameter (D50) of 2 μm were added to 1 kg of isotropic coke having a thermal expansion index (CTE) of 22 to 26 × 10 ⁻⁷ / ° C. and kneaded. At this time, the softening point of the coal-based pitch is 110 ° C.

More specifically, it was heated at a rate of 5 ° C / min, and kneaded at 150 ° C for 1 hour. Subsequently, secondary particles were obtained by natural cooling at room temperature.

The secondary particles were crushed at a rate of 800 rpm / min to prepare a powder. At this time, a pin mill device was used.

After the powder was added to the carbonization furnace, the temperature was raised at a rate of 10 ° C / min and carbonized at 1200 ° C for 1 hour. Thereafter, the mixture was naturally cooled at room temperature.

It was confirmed through industrial analysis that the carbonized volatile matter (VM) was 3.5%.

Finally, the carbonized powder was heated at a rate of 10 ° C / min to graphitize at 2600 ° C for 1 day. Subsequently, a negative active material for a lithium secondary battery was prepared by natural cooling at room temperature.

Example 3

To 1 kg of isotropic coke having a thermal expansion index (CTE) of 22 to 26 × 10 ⁻⁷ / ° C., 300 g of coal-based pitch, 500 g of coal tar, and 200 g of nano silica (SiO) having a particle diameter (D50) of 1 μm or less were added and kneaded. At this time, the softening point of the coal-based pitch is 110 ° C.

More specifically, it was heated at a rate of 5 ° C / min, and kneaded at 150 ° C for 1 hour. Subsequently, secondary particles were obtained by natural cooling at room temperature.

The secondary particles were crushed at a rate of 800 rpm / min to prepare a powder. At this time, a pin mill device was used.

Thereafter, 980 MPa pressure was applied to the pulverized powder using up and down pressing to uniaxially form the powder. As a result, a cylindrical block (molded product) having a diameter of 14 cm was produced.

Thereafter, the molded product was introduced into a carbonization furnace, and then heated at a rate of 10 ° C / min to carbonize at 1200 ° C for 1 hour. Thereafter, the mixture was naturally cooled at room temperature.

It was confirmed through industrial analysis that the carbonized volatile matter (VM) was 4.9%.

Finally, the carbonized molded article was heated at a rate of 10 ° C / min and graphitized at 3200 ° C for 1 day. Subsequently, a negative electrode active material for a lithium secondary battery was prepared by natural cooling at room temperature.

Comparative Example 1

Coke having a thermal expansion index (CTE) of less than 20X10 ^-7 / ° C was used.

Specifically, the thermal expansion index in the above range may be a commercially available needle coke level.

Comparative Examples 2 and 3

Comparative Example 2 added a binder in the range included in one embodiment of the present invention, and did not include a catalyst.

In Comparative Example 3, the catalyst was added in a range included in one embodiment of the present invention, but the binder was added so as not to be included in a range according to one embodiment of the present invention.

division Thermal expansion
Indices
(X10 ^-7 / ℃) weight Catalyst particle size
(D50, μm) Isotropic
cokes
(kg) bookbinder
(g) catalyst
(g) Example 1 37-40 One 300 200 50 Example 2 22-26 One 400 200 2 Example 3 22-26 One 800 200 1 or less Comparative Example 1 Less than 20 One 0 0 - Comparative Example 2 37-40 One 500 0 - Comparative Example 3 37-40 One 100 200 50

Experimental Example 1: Measurement of graphitization degree and specific surface area of negative electrode active material

The graphitization degree and specific surface area of the negative electrode active material prepared according to Examples and Comparative Examples were measured, and are shown in Table 2 below.

Specifically, the degree of graphitization was determined to be graphitization when the XRD value is 3.370 MPa or less based on the d (002) plane. The specific surface area means the result measured by a BET.

division XRD (Å)
(24-30º Narrow scan, 0.5º / min.)
Based on d (002) plane (26.5 degrees) Specific surface area
(m ² / g) Example 1 3.356 1.2 Example 2 3.358 1.9 Example 3 3.360 3.8 Comparative Example 1 3.362 1.5

As shown in Table 2, it can be confirmed that both the Examples and Comparative Examples were graphitized.

On the other hand, it can be seen that the specific surface areas of Examples 2 and 3 are larger than those of the comparative examples. Specifically, Examples 2 and 3 are the results of decomposition and volatilization in the graphitization step using catalyst particles of relatively small size. However, the embodiment may implement characteristics of a secondary battery having a level equal to or greater than that of a needle coke, as disclosed in Table 3, despite a large specific surface area.

Experimental Example 2: Measurement of initial discharge capacity, efficiency, and rapid charging characteristics of a lithium secondary battery (Half-cell)

A lithium secondary battery was manufactured using the negative electrode active material prepared according to the above Examples and Comparative Examples. Thereafter, initial discharge capacity, efficiency, and rapid charging characteristics of the lithium secondary battery were measured.

Specifically, the battery was driven under 1.5C-rate, 4.5V, charging and 0V cut-off discharge conditions, and the initial discharge capacity and efficiency were measured and shown in Table 2 below.

The rapid charging characteristics are shown in Table 3 below by measuring the time when the state of charge (SOC) reaches 95.6% when 2.5C is charged at 25 ° C.

Discharge capacity
(mAh / g) Discharge efficiency
(% Of the first cycle) Rapid charging characteristics
(min, minute) Example 1 352 91 95 Example 2 350 93 93 Example 3 335 88 221 Comparative Example 1 345 93 105 Comparative Example 2 320 81 - Comparative Example 3 330 76 -

As disclosed in Table 3, it can be seen that the characteristics of the secondary battery according to the embodiment are generally superior to those of the comparative example.

In particular, it can be seen that the Examples have excellent discharge capacity. In addition, it can be seen that, even with regard to the rapid charging characteristics, the time when the charging state reaches 95.6% when charging at 2.5C is excellent within 100 minutes.

This can also be confirmed through the drawings of the present invention.

1 is a lithium secondary battery according to Example 1 observed by SEM.

2 is a lithium secondary battery according to Example 2 observed by SEM.

3 is a lithium secondary battery according to Example 3 observed by SEM.

4 is a lithium secondary battery according to a comparative example observed by SEM.

As shown in FIGS. 1 to 3, it can be seen that the shape of the secondary particles according to the embodiment is not uniform and rather coarse particles are dispersed. In addition, it can be seen that the particle size range of the coarse particles is also relatively diverse.

On the other hand, as shown in Figure 4, the shape of the secondary particles according to the comparative example can be seen that the particles of relatively uniform size are dispersed.

In addition, in the case of Comparative Examples 2 and 3, which do not satisfy the weight range of the binder or catalyst, it can be confirmed that both the discharge capacity and the efficiency are inferior.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You will understand.

Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present invention. .

Claims (12)

Graphite material containing secondary particles,
The secondary particles are a plurality of primary particles aggregated,
The primary particles are isotropic coke having a coefficient of thermal expansion (CTE) of 37X10 ^-7 / ℃ to 40X10 ^-7 / ℃,
A negative electrode active material for a lithium secondary battery having a specific surface area (BET) of 1.2 to 1.9 m ² / g.
In claim 1,
The degree of graphitization of the negative electrode active material for a lithium secondary battery is a negative electrode active material for a lithium secondary battery having an XRD value of 3.350 to 3.365 kPa based on the d (002) plane.
Preparing isotropic coke as primary particles;
Kneading the primary particles with a binder and a catalyst to produce secondary particles;
Carbonizing the secondary particles; And
Graphitizing the carbonized secondary particles,
The thermal expansion index (CTE) of the isotropic coke is 37X10 ^-7 / ℃ to 40X10 ^-7 / ℃,
In the step of preparing the secondary particles by mixing the primary particles and a binder,
The secondary particles, a method for producing a negative electrode active material for a lithium secondary battery prepared by kneading a binder: 30 to 40 parts by weight, and a catalyst: 5 to 30 parts by weight with respect to 100 parts by weight of the primary particles.
In claim 3,
The method of manufacturing a negative electrode active material for a lithium secondary battery having a particle diameter (D50) of the isotropic coke is 5 to 10㎛.
In claim 4,
The catalyst includes Si, Si compounds, or a combination thereof,
Method of manufacturing a negative electrode active material for a lithium secondary battery having a particle diameter (D50) of the catalyst is 60 μm or less (excluding 0 μm).
In claim 3,
The binder is coal tar, petroleum-based pitch, coal-based pitch, or a combination thereof,
Method of manufacturing a negative electrode active material for a lithium secondary battery having a softening point of the binder is 90 to 250 ℃.
In claim 6,
The step of preparing the secondary particles by mixing the primary particles and the binder,
Method for producing a negative electrode active material for a lithium secondary battery carried out at a softening point or higher of the binder.
In claim 7,
Carbonizing the secondary particles,
Method for producing a negative electrode active material for a lithium secondary battery carried out at 800 to 1500 ℃.
In claim 8,
Graphitizing the carbonized secondary particles,
Method for producing a negative electrode active material for a lithium secondary battery performed at 2600 to 3200 ° C.
In claim 9,
The step of preparing the secondary particles by kneading the primary particles with the binder and the catalyst,
Method for producing a negative electrode active material for a lithium secondary battery further comprising the step of molding the kneaded secondary particles.
In claim 10,
The step of preparing the secondary particles by kneading the primary particles with the binder and the catalyst,
Method for producing a negative electrode active material for a lithium secondary battery further comprising the step of disintegrating the kneaded secondary particles.
anode;
A negative electrode comprising the negative electrode active material for a lithium secondary battery according to any one of claims 1 to 2; And
A lithium secondary battery comprising an electrolyte.

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