JP2003317806A - Nonaqueous lithium secondary cell, and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonaqueous lithium secondary cell capable of charging and discharging at ultra-high speed. <P>SOLUTION: For the nonaqueous lithium secondary cell having a positive current collector electrode to which, positive active material is adhered, a ultra- high speed charge/discharge with excellent charging/discharging characteristic is obtained by adjusting the amount of positive active material m [g/cm<SP>2</SP>] adhered to the metallic surface of the positive current collector so as to satisfy the relation m≤(η/σ)×(1/CQ), on condition that η [V] represents the decomposition overpotential of the electrolytic solution, σ [Ωcm<SP>2</SP>] represents the contact resistance the between the positive current collector and the positive material including the positive current collector, Q [mAh/g] represents the theoretical quantity of electricity of the lithium compound oxide, and C [h<SP>-1</SP>] represents the C rate of the lithium cell. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte lithium secondary battery that enables ultra-high speed charge / discharge and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventional non-aqueous electrolyte lithium secondary batteries have a drawback that they are inferior in charge / discharge characteristics as compared with other practical batteries. That is, the current (commercially available) lithium secondary battery has a problem that it takes time to charge and a large discharge current cannot be obtained (C rate: about 10). The reason for this is that the organic electrolyte used in the non-aqueous electrolyte lithium secondary battery has a conductivity that is smaller than that of other practical batteries, that is, an aqueous electrolyte by one digit or more. It is thought that this is because the charge transfer in the battery is lithium ion, whereas in the case of the aqueous solution type practical battery, the ionic radius is larger than that in the case of the proton, and therefore the diffusion into the electrolyte is slow. There is.

The inventors of the present invention have considered that there are some important factors other than the above reasons based on the experience of being involved in the research of electrochemistry. In a conventional non-aqueous electrolyte lithium secondary battery, aluminum having corrosion resistance in an organic electrolytic solution is generally adopted as a positive electrode current collector. Aluminum is a material that is excellent in corrosion resistance and electric conductivity and is an excellent material as a current collector material, but its corrosion resistance is due to the oxide passivation film formed on the surface. Therefore, the positive electrode active material adhered to the surface of the positive electrode current collector is separated by the passivation film, and the contact resistance becomes extremely large as compared with the case where the active material and the current collector are in direct contact. I wondered if this could be one of the factors that deteriorate the charge and discharge characteristics.

[0004]

The inventors of the present invention can study various factors that affect the contact resistance and control the factors to improve the charge / discharge characteristics of a lithium secondary battery. From the viewpoint that, Even if the charge and discharge characteristics of the battery are to be improved according to the conventional theory of factors, the conductivity of the organic electrolyte must be considered from the material development, and there is a practical limitation. Since it is an inherent property and cannot be expected to improve, rather than examining these factors, I came to be convinced that the above research method is an effective method that matches reality. That is, it is considered that the charge / discharge characteristics are controlled by the contact resistance between the positive electrode current collector and the positive electrode material (the positive electrode active material and the auxiliary agent), and this contact resistance is influenced from this viewpoint. I have examined the factors that are present.

As a result of this examination, the contact resistance σ [Ωcm
² ] is the amount m [g / cm ² ] of the positive electrode active material deposited per unit area of the positive electrode current collector, the decomposition overvoltage η [V] of the electrolytic solution, the theoretical amount of electricity Q [mAh / g] of the positive electrode active material, Depending on the C rate [h ^-1 ] of the lithium battery and the like, there is a certain relationship with these, and by appropriately adjusting these relationships, the charge / discharge characteristics of the lithium secondary battery can be determined. It turned out that it could be improved.

That is, the contact resistance σ [Ωcm ² ], the decomposition overvoltage η [V] of the electrolytic solution, and the positive electrode active material adhesion amount m [g / c].
m ² ], the theoretical amount of electricity Q [mAh / g] of the positive electrode active material, and the C rate [h ^-1 ] of the lithium battery, the following (Equation 1)
It has been found that the charging characteristics are significantly improved when satisfying the relationship. (Equation 1) m ≦ (η / σ) · (1 / CQ)

The present invention was made based on the above findings, and succeeded in providing a non-aqueous electrolyte lithium secondary battery excellent in charge / discharge characteristics by taking the constitution described below.

(1) In a non-aqueous electrolyte secondary battery in which a positive electrode active material is attached to a positive electrode current collector, a decomposition overvoltage η [V] of an electrolytic solution, a positive electrode material including a positive electrode current collector and a positive electrode active material. Contact resistance σ [Ωcm ² ] with, theoretical electric quantity Q [mAh / g] of lithium composite oxide, C rate [h] of lithium battery
⁻¹ ], the amount m [g / cm ² ] of the positive electrode active material deposited on the metal surface of the positive electrode current collector should satisfy the relationship shown in the following formula (formula 1) with respect to η, σ, C, and Q. The non-aqueous electrolyte lithium secondary battery is characterized in that it is adjusted to, and thereby enables ultra-fast charging. (Formula 1) m ≦ (η / σ) · (1 / CQ) (2) The nonaqueous electrolyte according to item (1), wherein the positive electrode active material is a composite oxide of lithium and a transition metal. Lithium secondary battery. (3) The non-aqueous electrolyte lithium secondary battery according to item (2), wherein the positive electrode active material contains a conductive auxiliary agent. (4) The non-aqueous electrolyte lithium secondary battery according to item (3), wherein the conductive additive is carbon powder. (5) A positive electrode active material precursor aqueous solution containing a water-soluble lithium salt, a water-soluble transition metal acid salt, and an organic substance containing hydroxyl acid is prepared, and a current collector metal is immersed in this aqueous solution and heated, It is polymerized to form a positive electrode active material precursor coating on the surface of the positive electrode current collector metal in advance, dried, and then baked together with the current collector metal to decompose organic substances, and at the same time, transition to lithium on the surface of the current collector. The positive electrode active material containing a complex oxide with a metal is formed by adhering and adhering the positive electrode active material so as to satisfy the following (formula 1), thereby enabling ultra-high-speed charging. The non-aqueous electrolyte lithium secondary battery according to any one of 1) to (4). (Formula 1) m ≦ (η / σ) · (1 / CQ) (6) The water-soluble lithium salt is a nitrate, and the water-soluble transition metal acid salt is a lithium salt, (5) above The non-aqueous electrolyte lithium secondary battery according to the item. (7) A positive electrode active material precursor aqueous solution containing a water-soluble lithium salt, a water-soluble transition metal salt, and an organic substance containing hydroxyl acid is prepared, and a current collector metal is immersed in the aqueous solution,
By heating, polymerizing, forming a positive electrode active material precursor coating in advance on the surface of the current collector metal, drying, and then firing together with the current collector metal to decompose organic substances, A non-aqueous electrolyte lithium secondary battery, characterized in that a positive electrode active material containing a lithium composite acid salt is formed in close contact so as to satisfy the relationship shown in (Formula 1) below, thereby enabling ultra-fast charging. Production method. (Formula 1) m ≦ (η / σ) · (1 / CQ) (8) The water-soluble lithium salt is a nitrate and the water-soluble transition metal salt is a lithium salt, (7) A method for manufacturing a non-aqueous electrolyte lithium secondary battery according to the item.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described with reference to Examples based on the following experiments. The outline of each of the drawings used in the following description will be described. Figure 1
FIG. 3 is an external view showing a photograph of a positive electrode current collector prepared by the production method of the present invention, showing a mode in which lithium manganate as a positive electrode active material is firmly and closely attached to the surface of a gold wire. ing. FIG. 2 shows an actual voltammogram of the electrode of the gold current collector using the lithium manganate shown in FIG. 1 as the active material.

(Example) Preparation of Positive Electrode Current Collector: The gold current collector of this example shown in FIG. 1 was produced according to the procedure and procedures described below. (I) First, a gold wire having a diameter of 0.03 cm was prepared as a positive electrode current collector metal. (Ii) Next, manganese nitrate, lithium nitrate, and citric acid were sampled so that the molar ratio of Mn: Li: citric acid was 2: 1: 2, and a small amount of distilled water was added to these to dissolve them. An active material precursor solution was prepared. (Iii) A gold wire (0.03 mm in diameter) serving as a current collector was immersed in this precursor aqueous solution at its tip, and water was evaporated at 55 ° C. using a rotary evaporator for degassing. (Iv) As a result, the aqueous solution became a highly viscous liquid in about 20 minutes, and the highly viscous liquid was attached to the tip of the gold wire dipped therein. (V) This is further vacuum dried (70 ° C for 4 hours),
A bulky hygroscopic powder (citric acid complex) and a gold wire having the surface of the lithium composite oxide powder obtained were obtained. The powder is amorphous by X-ray diffraction, and also SEM
From the observation, it was found that the hair was fluffy. (Vi) Next, after the completion of the drying step, the coated gold wire was calcined in the air for 30 seconds in an electric muffle furnace at about 300 ° C., and then further calcined at 800 ° C. for 2 hours. As a result, the citric acid complex was decomposed, and a gold wire coated with a thin layer of a sintered body made of a lithium composite oxide made of LiMn ₂ O ₄ was obtained. When the sintered body was confirmed by an X-ray diffractometer, a single-phase spinel L with developed crystallinity was obtained.
It was confirmed that iMn ₂ O ₄ was formed.

The positive electrode current collector prepared and prepared by the above procedure will be described with reference to FIG. 1. White parts in FIG. 1 are the parts where the surface of the gold current collector appears, and black parts are lithium manganate. Is a part attached to the gold current collector, and it is shown that lithium manganate is firmly adhered to the gold current collector in a mottled manner.
The significance of this positive electrode current collector setting is that by adopting gold as the current collector, it is not separated by a passive film unlike the case where the positive electrode active material is aluminum.
This means that during the experiment, it was possible to prepare a sample that did not corrode due to contact with the electrolytic solution and did not form a passivation film, eliminating the influence of contact resistance due to the passivation film. is there. In addition, since the positive electrode active material was firmly adhered to the current collector in a mottled manner, the contact resistance between the positive electrode active current collector and the positive electrode active material was reduced, and in addition, the influence of the amount of adhesion was affected. This means that we were able to prepare standardized samples that were easy to receive.

With respect to the positive electrode current collector manufactured by the above-described embodiment, the amount of active material coating or pressure-bonding per unit area m [g / cm ² ], the decomposition overvoltage η of the electrolytic solution
[V], contact resistance σ [Ωc between positive electrode current collector and positive electrode active material
m ² ], theoretical electric charge Q [mAh /
g] and the like are obtained, and the charge / discharge characteristics of the secondary battery according to the model defined by (Expression 1) and the relationship between Expression 1 and the charge / discharge characteristics are verified below.

FIG. 2 shows a voltammogram of the gold current collector to which lithium manganate shown in FIG. 1 is synthetically adhered. FIG. 7 shows a voltammogram of the attached positive electrode gold current collector when the potential sweep rate is 100 mV / s. According to FIG. 2, when the potential of the positive electrode was swept and varied, 0.9 V and 1.0 Vvs. Ag
There is a double peak peculiar to lithium manganate in the vicinity.
Double peaks appear at around 7V and 0.6V.

Based on the given voltammogram of the positive electrode current collector and given given manufacturing conditions, the relationship between the requirements by the above formula and the charge / discharge characteristics will be verified below. When the potential sweep speed is 100 mV / s, the voltage difference of 0.1 V on the horizontal axis of the voltammogram in FIG. 2 can be converted into the sweep time of 1 second, so the electric current for 5 seconds when the peak current appears integrates the current value during this period. It is obtained by doing. In order to simplify the calculation, the peak voltage is around 0.1 mA, so it is set to 0.1 mA, and if the double peak is approximated to one triangle and the amount of electricity indicated by the area is calculated, it is 5 s x
0.1 mA / 2 = 0.25 mC.

The theoretical capacity of lithium manganate is determined as follows. The formula weight of lithium manganate is 180.814 when calculated based on the molecular formula LiMn ₂ O _4.
6 (g / mol). When 100% of lithium reacts in one-electron reaction, Faraday constant = 96485 (C /
g), the theoretical capacity is 96485 (C / g) ÷ 180.8146 (g / mo)
l) = 533.6 (C / g). Here, since 1C = 1As, when the above theoretical capacity is converted into the conventional display mAh, 533.6 (C / g) / 3600 (s / h) × 1000
(MA / A) = 148 (mAh / g). From the above, the amount of electricity given to the positive electrode current collector is
Given that the theoretical capacity of lithium manganate constituting the positive electrode current collector is 148 mAh / g, the lithium manganate applied to the current collector is 0.25 (mC) ÷ 533.6 (C / g) = 0.47
(Μg), Therefore, the amount of positive electrode active material per unit volume is
0.47 / 0.094 = 5 μg / cm ² .

The fact that the peak value of the current was observed in the potential range of 0.5 V at the potential sweep rate of 100 mV / s means that the active material was charged and discharged in 5 seconds. Since the definition of the C rate is the current value for charging and discharging the active material in 1 hour, when the value of 5 seconds is converted into the C rate, it becomes 3600s / 5s = 720, which is a conventionally used lithium secondary battery. Compared with the upper limit of C rate of 10 h ⁻¹ , 720/10 = 72, which means that the electrode shown in FIG. 2 is set to a secondary battery that can be charged 72 times faster than that. Become.

The charge / discharge characteristics of the lithium secondary battery of the present invention derived from the voltammogram have been described and disclosed above.
Next, the relationship between the charge / discharge characteristics and (Formula 1) defined by the solution means will be examined, and the significance and validity of the formula will be mentioned and verified.

In the lithium secondary battery using the positive electrode active material of lithium manganate used in the experimental example, the charging overvoltage η of the electrolytic solution made of the above material is about 0.5 V, which is the same as the commercially available product. When the contact resistance σ of the gold current collector is estimated to be about 5Ω from a voltammogram obtained by digital simulation similar to the voltammogram, the maximum mass m of lithium manganate as an active material obtained from Formula 1 is 0.5V ÷ 5Ωcm ² ÷ (10h ^-1 × 148mAh /
g) = 6.7 × 10 ⁻⁵ g / cm ² , so that the mass of lithium manganate of 5 μg / cm ² calculated from the voltammogram of FIG. 2 should satisfy the condition described in claim 1. Recognize.

As disclosed and described above, the present invention provides
It is apparent that the electrolyte lithium secondary battery having extremely high high-rate charge / discharge characteristics was successfully provided by appropriately controlling the amount and state of attachment of the positive electrode active material to the positive electrode current collector. This proper amount of adhesion,
In addition, the adhered state is obtained only by the specific manufacturing process disclosed above, and due to this process, the positive electrode active material adheres firmly to the current collector metal in a mottled manner. . The above-described specific action and effect by the positive electrode current collector which is a requirement of the present invention, the thin film electrode shown as a comparative example below, and the positive electrode current collector and the positive electrode active material in the commercially available composite electrode Looking at the relationship, its significance is even clearer.

Composite electrode and its preparation method: LiCoO ₂ (provided by Furukawa Battery Co., Ltd.) was used as the positive electrode active material. To 30 mg of this active material, 5 mg of acetylene black (DENKA BLACK) was thoroughly mixed, and a Teflon (registered trademark) dispersion liquid (Du Pont-Mitsu) was mixed.
One drop of i Fluorochemical 30-j) was added and kneaded well in an agate mortar to give a rubber-like mixture as a positive electrode mixture. A stainless steel mesh (S
US 304, 100 mesh) was punched into a diameter of 8 mm, and a stainless wire (0.5 mmφ) spot-welded was used. Apply the positive electrode mixture to this collector,
Finally, using a jig, it was pressed at 1 ton / cm ² for 1 minute to obtain a sample electrode. An electrode obtained by pressure-bonding a Li foil on a stainless wire (SUS 304) was used as a counter electrode and a reference electrode. Propylene carbonate (PC) and 1, 2 in the electrolyte
1M lithium perchlorate LiClO ₄ with dimethoxyethane (DME) (1: 1 volume ratio) as solvent was used.
The cell was assembled and sealed in a glove box [(Miwa Seisakusho MDB-1K-O type (P)] filled with argon, and the measurement was performed at an incubator (S of 25 ± 0.5 ° C).
ANYO MIR-152).

Preparation of thin film electrode: A 0.1 mm thick gold foil was punched into a diameter of 8 mm, and a 0.3 mm diameter gold wire was spot-welded. Cobalt was electrolytically plated on this electrode with a 0.4 M aqueous cobalt chloride solution. Electrolytic current density is 20mA
-Cm ^-2 , and the electrolysis temperature was 25 ° C. Platinum was used as the counter electrode during plating. This cobalt-plated electrode was melted in an alumina crucible at 650 ° C. in an electric furnace (ESF2-ECP, Toyo Chemical Industry) to melt carbonate (LiCO3 + KCO).
3 = 43: 57 mol%) for about 2 hours, and then LiC
An oO ₂ thin film electrode was prepared.

The amount of the positive electrode active material deposited and the charge / discharge characteristics of each electrode prepared by the above-mentioned preparation method were as follows. Composite electrode: The amount of the positive electrode active material deposited was 30 mg. No peak was observed even when the potential sweep rate was 0.1 mV / s. Even if the electrode structure was improved, no peak could be observed at 1 mV / s or higher. Therefore, it is considered that this does not exceed 1 at the C rate, but by sacrificing some residual capacity, the quick charge and quick discharge capacities at the C rate of about 1 are:
It can be evaluated as having one. Thin film electrode: The amount of the positive electrode active material deposited was 250 μg.
It should be noted that this thin film electrode is a prior art in an experimental stage and is not publicly known, to the extent that it is prepared under special application development or research. Here, the method of oxidizing the plated metal introduced in this time in a molten salt has a unique meaning that it is easy to control the thickness of the thin film by controlling the plating thickness by the amount of electricity. There is a limit to the thinness of the thin film that can be obtained because the nucleus is inevitably deposited, and it cannot be sparsely formed as in the present invention. However, the data also support the fact that it can be charged and discharged at a much higher speed than the composite electrode. In some cases, the performance was such that charging / discharging was possible up to about 10 mV / s, which was equivalent to C = 1 to about 10.

On the other hand, the positive electrode current collector of the present invention has a positive electrode adhesion amount of 5 μg / cm ² and a potential sweep rate of 100 mV.
/ S to 1000 mV / s (C = 72 to 720) is as described above. That is, the positive electrode current collector electrode of the present invention has a high rate 10 to 100 times higher than that of a thin film electrode which is far superior in charge / discharge characteristics to a normal commercially available composite electrode. It turned out to be an electrode to be realized. The results are shown below (Table 1).

[0024]

[Table 1]

When considering the charge / discharge characteristics of the organic electrolyte lithium secondary battery, it has been conventionally considered that diffusion of lithium ions in the active material is the rate-determining process of the secondary battery, or its application like a composite electrode. Although it was thought that the thickness is a resistance, the present invention proposed this time does not necessarily mean that the above conventional idea is valid, but rather reduces the amount of the active material per unit area and at the same time the active material. It was found and confirmed that reducing the contact resistance of the current collector has an extremely large contribution rate.

The present invention is just a non-aqueous solution type lithium secondary battery. Therefore, it goes without saying that, in addition to the positive electrode active material and the positive electrode current collector, the specific configuration of the battery naturally includes elements such as an organic electrolytic solution, a separator, and a negative electrode current collector. However, in the present invention, these elements are merely omitted because they are needless to describe.

As the non-aqueous electrolyte used in designing the organic electrolyte lithium secondary battery according to the present invention, those which have been conventionally used in non-aqueous electrolyte lithium secondary batteries are used. That is, it is needless to say that it is prepared by dissolving an electrolyte serving as a lithium ion source in a high dielectric constant solvent, and any of those conventionally used can be used.

Specific examples of the high dielectric constant solvent used include:
DEC (Diethyl Carbonate), DM
C (Dimethyl carbonate), DME
(1,2-dimethoxyethane), EC
(Ethylene carbonate), EMC
(Ethyl methyl carbonate),
NMP (N-Methyl-2-pyrrolidone
e), PC (propyrene carbonat)
e), GBL (γ-butyrolactone) and the like. These can be used alone or in an appropriate mixture by mixing. The solvents listed here are merely for the purpose of disclosing specific modes for carrying out the invention, and are not meant to be limited thereto.

As the electrolyte serving as a lithium ion source, various lithium salts that have been conventionally used can also be used. Specific examples thereof include LiPF ₆ , L
iBF ₄ , LiClO ₄ , LiCF ₃ SO ₃ , LiN (CF
₃ SO ₂ ) _{2 and the} like. And this point, too,
It is just a description for disclosing specific modes for carrying out the invention, and is not meant to be limited to this, and is the same as the above-mentioned components.

In addition, various means constituting the organic electrolyte lithium secondary battery, the device structure, various related parts, etc. are
It is self-evident that it is used and set in the same way as in the past, and there is no reason to limit these.

[0031]

The current lithium secondary battery takes a long time to charge and a large discharge current cannot be obtained (C rate: 1
There was a problem of (up to about 0). It is considered that this is because the conductivity of the organic electrolyte is low and the diffusion of Li ions is slow. In the present invention, the positive electrode current collector and the positive electrode active material adhesion amount m is m = <(η / σ) · (1 / CQ) g
/ Cm ² [where η: decomposition overvoltage (V) of electrolyte,
σ: Contact resistance (Ωcm ² ) between the positive electrode current collector and the positive electrode material, C:
If the unit is set so as to satisfy 10 C (h ⁻¹ ) in C rate unit, Q: positive electrode active material], the C rate can be increased, and the charging / discharging characteristics of the lithium secondary battery can be drastically improved as compared with the past. It has become possible to improve the charge and discharge time of the battery in an extremely short time, that is, to provide a Li secondary battery having significantly improved current characteristics. Is considered to have great significance not only technically but also socially. That is, with the spread of mobile computers and mobile communication devices, the importance of batteries is growing today, and the spread of lithium batteries, especially secondary batteries, is remarkable, and the trend of consumption is increasing. It is believed that.
In recent years, with the aim of becoming an environment-oriented society, the development of secondary batteries, which play a part in electric power, is expected and is becoming a reality, so its significance is even more important. From that point of view, the significance of the present invention, in which the charge / discharge characteristics are greatly improved, is extremely significant.

[Brief description of drawings]

FIG. 1 is a gold current collector using lithium manganate as an active material in the production method of the present invention.

FIG. 2 is a voltammogram of an electrode of a gold current collector using the lithium manganate shown in FIG. 1 as an active material.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Endo             1-155 Tateyama, Yonezawa City, Yamagata Prefecture F term (reference) 5H029 AJ02 AK03 AM06 DJ07 DJ08                       HJ01 HJ18 HJ19 HJ20                 5H050 AA02 BA17 CA07 DA04 EA08

Claims (8)

[Claims] 1. In a non-aqueous electrolyte secondary battery in which a positive electrode active material is attached to a positive electrode current collector, decomposition overvoltage η of an electrolytic solution
[V], contact resistance σ [Ωcm ² ] between the positive electrode current collector and the positive electrode material including the positive electrode active material, theoretical electric quantity Q [mAh / g] of the lithium composite oxide, C rate [h ^{− of} lithium battery] ¹ ]
Then, the amount m [g / cm ² ] of the positive electrode active material deposited on the metal surface of the positive electrode current collector is adjusted so that the relations of η, σ, C, and Q are as follows: A non-aqueous electrolyte lithium secondary battery characterized by being rechargeable. (Equation 1) m ≦ (η / σ) · (1 / CQ) 2. The non-aqueous electrolyte lithium secondary battery according to claim 1, wherein the positive electrode active material is a composite oxide of lithium and a transition metal. 3. The non-aqueous electrolyte lithium secondary battery according to claim 2, wherein the positive electrode active material contains a conductive auxiliary agent. 4. The non-aqueous electrolyte lithium secondary battery according to claim 3, wherein the conductive additive is carbon powder. 5. A positive electrode active material precursor aqueous solution containing a water-soluble lithium salt, a water-soluble transition metal acid salt, and an organic substance containing hydroxyl acid is prepared, and a current collector metal is immersed in this aqueous solution and heated. Then, the positive electrode active material precursor coating is formed by closely adhering to the surface of the positive electrode current collector metal, dried, and then baked together with the current collector metal to decompose organic substances, and at the same time, lithium is applied to the surface of the current collector. A positive electrode active material containing a complex oxide of a transition metal and a transition metal is formed so that the amount of adhesion is adjusted so as to satisfy (Equation 1) shown below, and they are adhered to each other, thereby enabling ultra-high-speed charging. The non-aqueous electrolyte lithium secondary battery according to any one of claims 1 to 4. (Equation 1) m ≦ (η / σ) · (1 / CQ) 6. The water-soluble lithium salt is a nitrate salt, and the water-soluble transition metal acid salt is a lithium salt,
The non-aqueous electrolyte lithium secondary battery according to claim 5. 7. A water-soluble lithium salt, a water-soluble transition metal salt,
And an organic substance containing hydroxyl acid, a positive electrode active material precursor aqueous solution is prepared, and the current collector metal is immersed in this aqueous solution, heated and polymerized, and the positive electrode active material precursor is previously formed on the surface of the current collector metal. The organic substance is decomposed by forming a coating film by adhesion, drying, and then baking together with the current collector metal, and a positive electrode active material containing a lithium complex salt on the current collector surface is shown below (Formula 1). A method for producing a non-aqueous electrolyte lithium secondary battery, characterized in that the non-aqueous electrolyte lithium secondary battery is formed in close contact so as to satisfy the relationship defined in 1. above, thereby enabling ultra-high speed charging. (Equation 1) m ≦ (η / σ) · (1 / CQ) 8. The water-soluble lithium salt is a nitrate salt, and the water-soluble transition metal acid salt is a lithium salt,
The method for producing a non-aqueous electrolyte lithium secondary battery according to claim 7.