JP2022526701A - Lithium polymer battery and its preparation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lithium polymer battery and a method for preparing the same. The present invention provides a lithium polymer battery. The lithium polymer battery contains a positive electrode material containing a component of lithium cobalt oxide, a conductive agent, a binder, a carbon nanotube slurry or graphene, and a component of graphite carbon black, a conductive agent, a binder, fullerene, nanowire and nanotitanium. It contains a negative electrode material to be used, and an electrolytic solution containing diethyl carbonate, diphenyl ether, and ethylene carbonate. In the present invention, by adding carbon nanotube slurry or graphene to the positive electrode material of the battery and adding fullerene to the negative electrode material, the capacity of the lithium polymer battery of the present invention is increased from the capacity of the conventional battery, and the current density is increased. Internal resistance is reduced, heat generation and combustion are difficult, and even if it is pierced or damaged, it is difficult to short-circuit, improving the performance of lithium polymer batteries. [Selection diagram] Fig. 1

Description

The present invention relates to the battery field, and more particularly to a lithium polymer battery and a method for preparing the same.

Lithium polymer batteries have a long cycle life, high safety, and are widely used in pure large electric buses, but their application is limited due to their poor low temperature performance and low electron conductivity of the material. As the fuel saving index of hybrid vehicles is continuously improved, the excellent fast charge, fast discharge capacity, and low temperature performance of the modified high magnification lithium polymer battery will be applied to hybrid vehicles to help the fuel saving of automobiles. Especially in the cold winter, in order to guarantee the normal operation of the hybrid power system, the normal operation of the battery can be guaranteed by ensuring the excellent conductivity of the electrolytic solution at a low temperature.

An object of the present invention is to provide a lithium polymer battery and a method for preparing the same, in order to solve the above-mentioned problems.

In order to achieve the above object, the following technical measures have been taken in the present invention.
A lithium polymer battery containing a positive electrode material containing lithium cobaltate, a conductive agent, a binder, a carbon nanotube slurry or graphene, and a component such as graphite carbon black, a conductive agent, a binder, fullerene, nanowire and nanotitanium. It contains a negative electrode material contained therein, and an electrolytic solution containing diethyl carbonate, diphenyl ether, and ethylene carbonate.

Preferably, the positive electrode material comprises 2-10 parts by weight of lithium cobaltate, 5-30 parts by weight of the conductive agent, 1-15 parts by weight of the binder, 2.5-30 parts by weight of carbon nanotube slurry or graphene; The negative electrode material is graphite carbon black 1 to 20 parts by weight, conductive agent 5 to 30 parts by weight, binder 1 to 15 parts by weight, fullerene 0.8 to 25 parts by weight, nanowire 5 to 15 parts by weight, nanotitanium 2 to It is a mixed solution containing 8 parts by weight, and the electrolytic solution is composed of 10 to 40% diethyl carbonate, 2 to 10% diphenyl ether, and 30 to 60% ethylene carbonate in a volume percentage.

Preferably, the positive electrode is an aluminum foil.

Preferably, the negative electrode is a copper foil.

Preferably, the conductive agent is acetylene black.

Preferably, the binder is polyvinylidene fluoride (PVDF).

The present invention also provides a method for preparing the above lithium polymer battery, which comprises the following steps (1) to (3). That is,
(1) Raw material composition: Lithium cobalt oxide, a conductive agent, a binder, and a carbon nanotube slurry are mixed to obtain a mixed positive electrode slurry, and graphite carbon black, a conductive agent, a binder, fullerene, nanowire, and nanotitanium are mixed and mixed. The process of obtaining a negative electrode slurry,
(2) Coating: A process in which the positive electrode slurry is applied to the positive electrode with a coating machine and the negative electrode slurry is applied onto the negative electrode with a coating machine.
(3) A step of obtaining the battery of the present invention by rolling, slitting, laser cutting, winding, assembling, top / side sealing, drying, electrolytic solution injection, and chemical conversion, and finally packaging.

Preferably, it is necessary to extract fullerene before the step (1), and in the extraction method, carbon powder is placed in an oxidation-reduction firing kiln, energized and burned, and then black fine particles of carbon adhering to the inner wall of the firing kiln. Is extracted, and the process of obtaining the fullerene through electrostatic processing is used.

Preferably, the electrolytic solution needs to be prepared before the step (1), and is prepared by the following method, that is, when the organic solvents diethyl carbonate and ethylene carbonate are mixed and finally diphenyl ether is added, the electrolytic solution is prepared. To get.

Preferably, the negative electrode material of the step (2) is prepared by the following method, that is, graphite carbon black, a conductive agent, a binder, fullerene, nanowire, and nanotitanium are mixed and then pulverized into a powder to obtain a powder. The negative electrode material is obtained by transferring to a high pressure reactor having a pressure of 30 to 50 mPa, then placing the reactor in a microwave oven having an output of 1800 to 2200 w, heating for 200 to 1200 seconds, and cooling to room temperature.

According to the present invention, by adding diethyl carbonate, ethylene carbonate and diphenyl ether to the electrolytic solution, the transfer of lithium salt ions at low temperature can be effectively improved in the lithium polymer battery of the present invention, and the low temperature performance can be improved. Diethyl carbonate and ethylene carbonate as solvents play a role in lowering the freezing point of the low temperature solvent. At the same time, the present invention increases the capacity of the lithium polymer battery of the present invention from the capacity of the conventional battery and increases the current density by adding carbon nanotube slurry or graphene to the positive electrode material of the battery and adding fullerene to the negative electrode material. However, the internal resistance is reduced, it is difficult to generate heat and burn, it is difficult to short-circuit even when it is pierced or damaged, and the performance of the lithium polymer battery is improved.

6 is a curve of charge capacity, discharge capacity, charge specific capacity, and discharge specific capacity of the battery provided by the first embodiment of the present invention. It is a curve of the charge / discharge efficiency of the battery provided by Example 1 of this invention. It is a photograph of the electrostatic loader used at the time of fullerene preparation which concerns on embodiment of this invention.

Hereinafter, the present invention will be described in detail with reference to Examples.

The graphite carbon black described in the present invention is understood as graphitized carbon black.

With respect to the lithium polymer battery provided in the examples of the present invention, the overall performance of the product can be significantly improved by adding fullerene in the negative electrode slurry, and the amount of fullerene added may be 4 / 10,000 or more, which is a small amount. The added fullerene of was caused an unexpected effect. For the examples described below, the fullerene added into the negative electrode slurry comprises a combination of 70% positively charged fullerene and 30% negatively charged fullerene. Preferably, the combination of positive and negative charged fullerenes is charged into the negative electrode slurry of the battery in a mass ratio of 3 to 7%. The fullerene extracted by the present invention can be directly applied to a battery without being purified by the toluene method. Negative electrode materials have a significant impact on battery energy density, life and safety. When the fullerene prepared in the present invention is used in the negative electrode, it helps to improve the charge transfer rate and the insulation between the electrodes, and the volume change of the electrodes due to charging and discharging can be suppressed, so that the capacity is higher, the life is longer, and the life is higher. Batteries with safety (hard to ignite or explode) can be manufactured. Compared with expensive fullerenes because they cannot be industrialized or mass-produced at present, the preparation method of the present invention can produce fullerenes in large quantities and can obtain relatively inexpensive fullerenes.

(Example 1)
The positive electrode material of the lithium polymer battery of this embodiment contains components of 2 parts by weight of lithium cobaltate, 5 parts by weight of acetylene black, 1 part by weight of polyvinylidene fluoride (PVDF), and 2.5 parts by weight of carbon nanotube slurry; negative electrode material. Contains 1 part by weight of graphite carbon black, 5 parts by weight of acetylene black, 1 part by weight of polyvinylidene fluoride, and 0.8 parts by weight of fullerene. The electrolytic solution contains a mixed solution composed of 10% diethyl carbonate by volume, 2% diphenyl ether, and 30% ethylene carbonate.

The method for preparing the lithium polymer battery of this example includes the following steps (1) to (3). That is,
(1) Raw material composition: The above-mentioned parts by weight of lithium cobaltate, acetylene black, polyvinylidene fluoride (PVDF), and carbon nanotube slurry are mixed to obtain a mixed positive electrode slurry; the above-mentioned parts by weight of graphite carbon black, acetylene black, and polyfluoride are obtained. The process of mixing vinylidene and fullerene to obtain a mixed negative electrode slurry,
(2) Coating: A process in which the positive electrode slurry is applied to an aluminum foil with a coating machine and the negative electrode slurry is applied to a copper foil with a coating machine.
(3) A step of obtaining the battery of the present invention by rolling, slitting, laser cutting, winding, assembling, top / side sealing, drying, electrolytic solution injection, and chemical conversion, and finally packaging.

In this example, fullerene was extracted using the following steps.
(1) Approximately 1 ton of firewood (uncontaminated pine, cedar, hinoki, etc.) is put into an oxidation / reduction firing kiln for ceramics and burned, and after 24 hours, it adheres to the top from the inner wall of the oxidation / reduction firing kiln. The process of extracting 1100 g of burning residue,
(2) A step of putting this 1100 g of burnt residue into an electrostatic loader and electrostatically processing it to obtain 110 g of conductive fullerene.

Specifically, in step (1), the burnt residue obtained after combustion is generated by an electrostatic high voltage generator (that is, an electrostatic loader, model number GC50S-N, input voltage AC100V50 / 60HZ, maximum output voltage DC50kV, as shown in FIG. (Fixed), maximum output current 20 μA, power consumption 10 VA, effective distance 50 to 250 mm, grounding 100 Ω or less), the burnt residue is loaded in the electrostatic loader according to the positive and negative properties, respectively, to apply positive charge. A charged fullerene and a negatively charged fullerene are obtained, and then the mixed burnt residue of these charged fullerene is purified by the toluene method, and 70% of the positively charged fullerene burnt residue after purification is negatively charged. The fullerene raw material in the negative electrode slurry is obtained by mixing according to the ratio of 30% of the tinged material.

As a method for preparing the electrolytic solution in this example,
Diethyl carbonate and ethylene carbonate, which are organic solvents, were mixed, and finally diphenyl ether was added to obtain the electrolytic solution.

(Example 2)
The positive electrode material of the lithium polymer battery of this embodiment contains components of 10 parts by weight of lithium cobaltate, 30 parts by weight of acetylene black, 15 parts by weight of polyvinylidene fluoride, and 30 parts by weight of carbon nanotube slurry; the negative electrode material is graphite carbon black. It contains 20 parts by weight of acetylene black, 5 parts by weight of polyvinylidene fluoride, and 25 parts by weight of fullerene. The electrolytic solution contains a mixed solution composed of 40% diethyl carbonate by volume, 10% diphenyl ether, and 60% ethylene carbonate.

In this example, the preparation method of Example 1 was used.

(Example 3)
The positive electrode material of the lithium polymer battery of this embodiment contains components of 5 parts by weight of lithium cobaltate, 15 parts by weight of acetylene black, 8 parts by weight of polyvinylidene fluoride, and 15 parts by weight of carbon nanotube slurry; the negative electrode material is graphite carbon black. It contains 10 parts by weight of acetylene black, 5 parts by weight of polyvinylidene fluoride, and 13 parts by weight of fullerene. The electrolytic solution contains a mixed solution composed of 20% diethyl carbonate by volume, 5% diphenyl ether, and 40% ethylene carbonate.

In this example, the preparation method of Example 1 was used.

(Example 4)
The lithium polymer battery of this embodiment contains a positive electrode material, a negative electrode material, and an electrolytic solution, and the positive electrode material is prepared from a positive electrode and a positive electrode slurry supported on the positive electrode, and the negative electrode material is a negative electrode and above the negative electrode. The positive electrode slurry contains 8 parts by weight of lithium cobaltate, 12 parts by weight of acetylene black, 12 parts by weight of polyvinylidene fluoride (PVDF), and 5 parts by weight of carbon nanotube slurry. The negative electrode slurry contains 12 parts by weight of graphite carbon black, 9 parts by weight of acetylene black, 7 parts by weight of polyvinylidene fluoride, and 0.015 parts by weight of fullerene; the solvent in the electrolytic solution is 40% carbon dioxide by volume. It was composed of diethyl, 5% diphenyl ether, and 55% ethylene carbonate.

The method for preparing the lithium polymer battery of this example includes the following steps (1) to (5). That is,
(1) Preparation of positive electrode slurry: A step of mixing each component in the positive electrode slurry according to the blending amount and stirring uniformly to obtain a positive electrode slurry.
(2) Preparation of negative electrode slurry: After mixing each component in the negative electrode slurry according to the blending amount, it is crushed into powder, the powder is transferred to a high pressure reactor with a pressure of 30 to 50 mPa, and then the reactor is put into a microwave oven with an output of 1800 w. The process of obtaining a negative electrode material by putting it in a microwave oven, heating it for 200 seconds, and cooling it to room temperature.
(3) Coating: A process of applying the positive electrode slurry to an aluminum foil with a coating machine to obtain a positive electrode sheet, and applying a negative electrode slurry to a copper foil with a coating machine to obtain a negative electrode sheet.
(4) Preparation of electrolyte: First, the high polymer is dissolved in a mixed solvent of 40% diethyl carbonate, 5% diphenyl ether and 55% ethylene carbonate in a volume percentage, and then a liquid electrolyte containing a lithium salt is added to complete the process. Then the solution is poured into a Teflon® plastic film and dried at room temperature to prepare a gel polymer electrolyte film until the solvent is completely volatilized.
(5) A step of obtaining the battery of the present invention by rolling, slitting, laser cutting, winding, assembling, top / side sealing, drying, electrolytic solution injection, and chemical conversion, and finally packaging.

Here, the fullerene used for the negative electrode slurry was obtained in the following step.
i A process of putting 1 ton of uncontaminated pine firewood into an oxidation / reduction firing kiln for ceramics and burning it, and after 24 hours, extracting 1100 g of the burnt residue adhering to the top from the inner wall of the oxidation / reduction firing kiln. ,
ii A process in which the extracted burnt residue is placed in an electrostatic loader and electrostatically processed to obtain conductive fullerenes.

The electrostatic loader means an electrostatic high-pressure generator, and the electrostatic high-pressure generator is a combustible material (for example, a log is burned to become charcoal, the log is a combustible material, and ore, round stone, etc. are also combustible. It should be noted that static electricity can be generated by processing (contained in objects).

(Example 5)
The lithium polymer battery of this embodiment contains a positive electrode material, a negative electrode material, and an electrolytic solution, and the positive electrode material is prepared from a positive electrode and a positive electrode slurry supported on the positive electrode, and the negative electrode material is a negative electrode and above the negative electrode. The positive electrode slurry contains 9 parts by weight of lithium cobaltate, 25 parts by weight of acetylene black, 8 parts by weight of polyvinylidene fluoride (PVDF), and 25 parts by weight of carbon nanotube slurry. The negative electrode slurry contains 17 parts by weight of graphite carbon black, 25 parts by weight of acetylene black, 3 parts by weight of polyvinylidene fluoride, and 3 parts by weight of fullerene; the solvent in the electrolytic solution is 40% diethyl carbonate by volume. It was composed of 10% diphenyl ether and 50% ethylene carbonate.

The method for preparing the lithium polymer battery of this example includes the following steps (1) to (5). That is,
(1) Preparation of positive electrode slurry: A step of mixing each component in the positive electrode slurry according to the blending amount and stirring uniformly to obtain a positive electrode slurry.
(2) Preparation of negative electrode slurry: After mixing each component in the negative electrode slurry according to the blending amount, it is crushed into powder, the powder is transferred to a high pressure reactor with a pressure of 30 to 50 mPa, and then the reactor is put into a microwave oven with an output of 2200 w. The process of obtaining a negative electrode material by putting it in a microwave oven, heating it for 1200 seconds, and cooling it to room temperature.
(3) Coating: A process of applying the positive electrode slurry to an aluminum foil with a coating machine to obtain a positive electrode sheet, and applying a negative electrode slurry to a copper foil with a coating machine to obtain a negative electrode sheet.
(4) Preparation of electrolyte: First, the high polymer is dissolved in a mixed solvent of 40% diethyl carbonate, 10% diphenyl ether and 50% ethylene carbonate in a volume percentage, and then a liquid electrolyte containing a lithium salt is added to complete the process. Then the solution is poured into a polyethylene terephthalate film and dried at room temperature to prepare a gel polymer electrolyte film until the solvent is completely volatilized.
(5) A step of obtaining the battery of the present invention by rolling, slitting, laser cutting, winding, assembling, top / side sealing, drying, electrolytic solution injection, and chemical conversion, and finally packaging.

Here, the fullerene used for the negative electrode slurry was obtained in the following step.
i A process of putting 1 ton of uncontaminated cedar firewood into an oxidation / reduction firing kiln for ceramics and burning it, and after 24 hours, extracting 780 g of the burnt residue adhering to the top from the inner wall of the oxidation / reduction firing kiln. ,
ii A process in which the extracted burnt residue is placed in an electrostatic loader and electrostatically processed to obtain conductive fullerenes.

(Example 6)
The difference between Example 6 and Example 4 is that the solvent in the electrolytic solution was composed of 35% diethyl carbonate by volume, 8% diphenyl ether, and 57% ethylene carbonate.

(Example 7)
The differences between Example 7 and Example 4 are as follows. That is,
The fullerene used in the negative electrode slurry was obtained in the following step.
i Put 1 ton of uncontaminated hinoki firewood in an oxidation / reduction firing kiln for ceramics and burn it. After 24 hours, 900g of the burnt residue adhering to the top from the inner wall of the oxidation / reduction firing kiln is extracted. A process in which the burnt residue is placed in an electrostatic loader and electrostatically processed to obtain a conductive fullerene.

(Comparative Example 1)
The only difference between Comparative Example 1 and Example 1 is that diethyl carbonate is not added to the electrolytic solution.

(Comparative Example 2)
The only difference between Comparative Example 2 and Example 1 is that the negative electrode material does not contain fullerenes, nanowires, or nanotitaniums.

(Comparative Example 3)
The difference between Comparative Example 3 and Example 1 is that the negative electrode slurry does not contain fullerene.

When the lithium polymer batteries prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were tested, the test index and the test result are shown below.

1. Performance test The lithium polymer batteries obtained in the above examples were subjected to a 30C magnification discharge performance test, a battery DCR test, a -30 ° C cold start test, etc., and the test results are shown in Table 1. ing.

As can be seen from the test data such as the room temperature 30C discharge capacity retention rate, dynamic internal resistance (DCR), and low temperature cold start of the battery, the lithium polymer battery of the present invention is a battery by adding carbon nanotube / graphene to the positive electrode material. The magnification of the battery can be increased, the dynamic internal resistance of the battery can be significantly reduced, and the magnification performance of the battery can be improved. The electrolytic solution uses a specific solvent formulation, and by adding diethyl carbonate, the movement of lithium salt ions at low temperature is effectively improved, and the low temperature performance is improved. The solvent ethyl acetate lowers the freezing point of the cold solvent and at the same time plays a role of overcharge protection. It can be seen that the lithium polymer battery of the present invention is excellent in low temperature and high magnification discharge and cycle performance.

2. Cycle test The lithium polymer battery obtained in the example was taken and subjected to 0.5C charge and 1C discharge (300 cycles) test, and constant current / constant voltage charge (voltage 4.35V, current 475mA, cutoff current). 9.5mA), constant current discharge (voltage 3v, current 950mA)), and the number of cycles was 300. According to the test results, a curve of charge capacity, discharge capacity, charge specific capacity, and discharge specific capacity (FIG. 1) and a curve of charge / discharge efficiency (FIG. 2) were drawn.

In the case of FIG. 1, the curve Y1 represents the charge capacity (mAh), the curve Y2 represents the discharge capacity (mAh), the curve Y3 represents the charge ratio capacity (mAh / g), and the curve Y4 represents the discharge ratio capacity (mAh). / G).

As can be seen from FIGS. 1 and 2, the charge / discharge performance of the battery obtained in Example 1 is good.

Since the cycle test effects of Examples 2 to 6 are similar to the effects of Example 1, the description thereof will be omitted here.

3. Destruction test results The following destructive test was carried out by taking the batteries (specifications: 25 x 37 x 76 mm) obtained in Examples 1 to 6.
1) Strike test: When a steel hammer weighing 10 kg is freely dropped from a height of 1 m, it does not ignite or explode;
2) Overcharge test: No heat generation or explosion;
3) Nail piercing test: When the battery was pierced directly with a 3 x 8.0 mm iron nail, it did not ignite or explode;
4) Submersion test: There is no change in performance even when submerged for 24 hours;
5) Thermal shock cycle test: When placed in a temperature tester and the temperature was raised from 5 ° C to 150 ° C, there was no ignition or explosion;
6) Vibration test: When placed in a vibration tester and subjected to reciprocating vibration for 30 minutes, there was no change in appearance or performance;
7) Crushing test: When placed in a crushing tester and applied with a maximum pressure of 17 MPa, it did not ignite or explode;
8) Driver piercing test: After penetrating the driver through the battery, there is no change in voltage (in the case of a general battery, a short circuit occurs due to penetration and the voltage becomes zero), and after 6 to 7 minutes, 6 to 7 ° C. There is a temperature rise in
9) Drop test: When the battery was freely dropped from a height of 6 m above the ground onto an iron plate, there was no change in voltage.

Through the above experiments, it was verified that the quality of the lithium polymer batteries of Examples 1 to 6 of the present invention completely satisfies the safety certification requirements such as PSE, GB, and UC.

The above embodiments are merely preferred embodiments of the invention, and the scope of protection of the invention is not limited to this embodiment and is non-substantial by those skilled in the art as long as it does not deviate from the technical idea of the invention. Even if it is changed and replaced, it is covered by the scope of protection claimed by the present invention.

Claims (10)

A positive electrode material containing a component of lithium cobaltate, a conductive agent, a binder, a carbon nanotube slurry or graphene, a negative electrode material containing a component of graphite carbon black, a conductive agent, a binder, fullerene, nanowire, and nanotitanium, and carbon dioxide. A lithium polymer battery comprising an electrolytic solution containing diethyl, diphenyl ether, and ethylene carbonate. The positive electrode material contains 2 to 10 parts by weight of lithium cobaltate, 5 to 30 parts by weight of a conductive agent, 1 to 15 parts by weight of a binder, and 2.5 to 30 parts by weight of carbon nanotube slurry or graphene; the negative electrode material. Is graphite carbon black 1 to 20 parts by weight, conductive agent 5 to 30 parts by weight, binder 1 to 15 parts by weight, fullerene 0.8 to 25 parts by weight, nanowire 5 to 15 parts by weight, nanotitanium 2 to 8 parts by weight. The electrolytic solution is a mixed solution composed of 10 to 40% diethyl carbonate, 2 to 10% diphenyl ether, and 30 to 60% ethylene carbonate by volume. Item 2. The lithium polymer battery according to Item 1. The lithium polymer battery according to claim 1 or 2, wherein the positive electrode is an aluminum foil and the negative electrode is a copper foil. The lithium polymer battery according to claim 1 or 2, wherein the fullerene comprises the preparation of a fullerene having a positive charge of 70% and a fullerene having a negative charge of 30%. The lithium polymer battery according to claim 1 or 2, wherein the conductive agent is acetylene black. The lithium polymer battery according to claim 1 or 2, wherein the binder is polyvinylidene fluoride. The method for preparing a lithium polymer battery according to any one of claims 1 to 6, which comprises the following steps (1) to (3).
(1) Raw material composition: Lithium cobalt oxide, a conductive agent, a binder, and a carbon nanotube slurry are mixed to obtain a mixed positive electrode slurry, and graphite carbon black, a conductive agent, a binder, fullerene, nanowire, and nanotitanium are mixed and mixed. The process of obtaining a negative electrode slurry,
(2) Coating: A process in which the positive electrode slurry is applied to the positive electrode with a coating machine and the negative electrode slurry is applied onto the negative electrode with a coating machine.
(3) A step of obtaining the battery of the present invention by rolling, slitting, laser cutting, winding, assembling, top / side sealing, drying, electrolytic solution injection, and chemical conversion, and finally packaging. It is necessary to extract fullerene before the step (1), and the extraction method is to put the carbon powder in a redox firing kiln and energize it to burn it, and then extract the black fine particles of carbon adhering to the inner wall of the firing kiln. The method for preparing a lithium polymer battery according to claim 7, further comprising a step of obtaining the fullerene through electrostatic processing. It is necessary to prepare an electrolytic solution before the step (1), and it is prepared by the following method, that is, the organic solvents diethyl carbonate and ethylene carbonate are mixed, and finally diphenyl ether is added to obtain the electrolytic solution. 7. The method for preparing a lithium polymer battery according to claim 7. The negative electrode material in the step (2) is prepared by the following method, that is, graphite carbon black, a conductive agent, a binder, fullerene, nanowires, and nanotitanium are mixed and then pulverized into a powder, and the powder has a pressure of 30 to 30. 7. The negative electrode material is obtained by transferring to a high-pressure reactor of 50 mPa, then placing the reactor in a microwave oven having an output of 1800 to 2200 w, heating for 200 to 1200 seconds, and cooling to room temperature. The method for preparing a lithium polymer battery according to.

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