JP3918311B2 - Negative electrode material and non-aqueous electrolyte secondary battery using the same - Google Patents

Negative electrode material and non-aqueous electrolyte secondary battery using the same Download PDF

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JP3918311B2
JP3918311B2 JP21460398A JP21460398A JP3918311B2 JP 3918311 B2 JP3918311 B2 JP 3918311B2 JP 21460398 A JP21460398 A JP 21460398A JP 21460398 A JP21460398 A JP 21460398A JP 3918311 B2 JP3918311 B2 JP 3918311B2
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negative electrode
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compound
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non
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JPH11102705A (en
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浩 井本
心一郎 山田
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ソニー株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation
    • Y02E60/122Lithium-ion batteries

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a negative electrode material that can be doped / undoped with lithium, and relates to a non-aqueous electrolyte secondary battery using the same.
[0002]
[Prior art]
With recent advances in electronic technology, compact portable electronic devices such as camera-integrated video tape recorders, mobile phones, and laptop computers have been developed. As portable power sources for using these devices, they are small, lightweight, and have high energy density. There is a strong demand for the development of secondary batteries having the following characteristics.
[0003]
Non-aqueous electrolyte secondary batteries that use light metals such as lithium, sodium, and aluminum as the negative electrode active material are expected as secondary batteries that can meet such demands. Yes. Among these, non-aqueous electrolyte lithium secondary batteries are actively researched and developed because they are easy to handle and can achieve high output and high energy density.
[0004]
By the way, when these light metals such as lithium metal are used as the negative electrode material of the non-aqueous electrolyte secondary battery as they are, the light metal tends to precipitate in the form of dendrites on the negative electrode during the charging process, and the current density is very high at the tip of the dendrites. To be high. For this reason, there has been a problem that the cycle life is reduced due to decomposition of the non-aqueous electrolyte, or the dendrite grows excessively and an internal short circuit of the battery occurs.
[0005]
Therefore, in order to prevent the precipitation of such dendritic metals, these lithium metals are not simply used as they are for the negative electrode, but graphite materials or pores using intercalation reaction of lithium ions between graphite layers. A carbonaceous material using lithium ion doping / dedoping action is used.
[0006]
[Problems to be solved by the invention]
However, in the graphite material using the intercalation reaction, there is an upper limit in the negative electrode capacity as defined by the composition C 6 Li of the first stage graphite intercalation compound. In addition, it is industrially difficult to control the fine pore structure of a carbonaceous material to which doping and dedoping action is applied, and the specific gravity of the carbonaceous material is reduced, resulting in a negative electrode per unit volume. It cannot be an effective means for improving the capacity.
[0007]
For these reasons, it is considered difficult for the current carbon materials to cope with the longer use of electronic devices in the future and the higher energy density of the power supply, and it has better lithium doping and dedoping capabilities. Development of a negative electrode material is desired.
[0008]
The present invention is intended to solve such a problem, and provides a negative electrode material with more excellent lithium doping / undoping ability and a non-aqueous electrolyte secondary battery having a larger capacity. It is intended.
[0009]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present inventors have found that a compound containing at least one of silicon, germanium, and tin, nitrogen, and oxygen has a lithium doping / undoping ability. It was found to be an excellent negative electrode material.
[0010]
The negative electrode material according to the present invention has a general formula M x N y O z (M is at least one element of Si, Ge, and Sn, and x, y, and z are respectively 1.4 <x <2.1. 1.4 <y <2.1, 0.9 <z <1.6.)).
[0011]
Specific examples of this compound include Si 2 N 2 O, Ge 2 N 2 O, and Sn 2 N 2 O.
[0012]
The compound may contain at least one of lithium, sodium, potassium, magnesium, calcium, and aluminum.
[0013]
In a compound composed of at least one of silicon, germanium, and tin, and nitrogen and oxygen, for example, a pseudo-plane composed of a chair-shaped six-membered ring composed of silicon and nitrogen spreads, and a silicon-oxygen-silicon bond is formed between the planes. Are present to crosslink. It is considered that this interlayer is formed in a one-dimensional tunnel shape as a lithium doping / dedoping site. Therefore, the negative electrode material made of this compound has a larger doping / de-doping ability than the conventional carbonaceous material.
[0014]
Further, the negative electrode according to the present invention has a general formula M x N y O z (M is at least one element of Si, Ge, and Sn, and x, y, and z are 1.4 <x <2. 1, 1.4 <y <2.1, 0.9 <z <1.6.).
The negative electrode contains at least one of a carbonaceous material, a metal powder, and a conductive polymer.
[0015]
The non-aqueous electrolyte secondary battery according to the present invention has a general formula M x N y O z (M is at least one element of Si, Ge, and Sn, and x, y, and z are each 1. 4 <x <2.1, 1.4 <y <2.1, 0.9 <z <1.6.) A negative electrode containing a compound represented by: a positive electrode, a non-aqueous electrolyte, It is characterized by having.
Specific examples of the compound used for the negative electrode include, for example, Si 2 N 2 O, Ge 2 N 2 O, and Sn 2 N 2 O.
[0016]
Moreover, the compound used for this negative electrode may contain at least any one of lithium, sodium, potassium, magnesium, calcium, and aluminum. Thereby, the electroconductivity of negative electrode material can be improved.
[0017]
Moreover, it is good to make this negative electrode material contain at least any one of a carbonaceous material, metal powder, and a conductive polymer as a electrically conductive agent.
[0018]
As described above, the non-aqueous electrolyte secondary battery according to the present invention has a large negative electrode capacity because it has a large doping and dedoping capability, and can obtain a large capacity when combined with an appropriate positive electrode. It becomes possible.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the negative electrode material and the nonaqueous electrolyte secondary battery according to the present invention will be described in detail.
[0020]
The negative electrode material according to the present invention is a compound containing at least one of silicon, germanium, and tin, nitrogen, and oxygen.
[0021]
This compound has the general formula M x N y O z (M is at least one element of Si, Ge and Sn, and x, y and z are 1.4 <x <2.1 and 1.4, respectively. <Y <2.1, 0.9 <z <1.6.)
[0022]
Specific examples of this compound include Si 2 N 2 O, Ge 2 N 2 O, Sn 2 N 2 O and the like.
[0023]
Moreover, you may add alkali metals or alkaline-earth metals, such as lithium, sodium, potassium, magnesium, calcium, aluminum, to this compound. For example, a part of Si may be replaced with Al, such as Si 2-x Al x N 2-x O 1 + x . Thus, by replacing a part of the tetravalent element with another monovalent or divalent element, the conductivity can be improved.
[0024]
In a compound composed of at least one of silicon, germanium, and tin, and nitrogen and oxygen, for example, a pseudo-plane composed of a chair-shaped six-membered ring composed of silicon and nitrogen spreads, and a silicon-oxygen-silicon bond is formed between the planes. Are present to crosslink. It is considered that this interlayer is formed in a one-dimensional tunnel shape as a lithium doping / dedoping site. Therefore, the negative electrode material made of this compound has a larger doping / de-doping ability than the conventional carbonaceous material.
[0025]
On the other hand, as described above, the non-aqueous electrolyte secondary battery according to the present invention includes at least one of silicon, germanium, and tin, a negative electrode mainly composed of a compound including nitrogen and oxygen, and lithium, for example. It is characterized by comprising a positive electrode mainly composed of a composite metal oxide containing or an intercalation compound containing lithium, and a non-aqueous electrolyte.
[0026]
As described above, examples of the compound serving as the negative electrode material include Si 2 N 2 O, Ge 2 N 2 O, Sn 2 N 2 O, and the like.
[0027]
When the negative electrode material is not conductive or low, the negative electrode material may be monovalent or divalent element, for example, alkali metal such as lithium, sodium, potassium, magnesium, calcium, aluminum, or alkaline earth Conductivity may be improved by doping with metal or the like. For example, a part of Si may be replaced with Al, such as Si 2-x Al x N 2-x O 1 + x . In this way, a material partially substituted with another element can also be suitably used.
[0028]
In addition, when forming a negative electrode from a negative electrode material, the conductivity of the negative electrode material is ensured by adding a carbonaceous material, electrically conductive metal powder, conductive polymer, etc. as a conductive agent together with a binder. Also good. Any conventionally known binder can be used as the binder.
[0029]
As described above, the non-aqueous electrolyte secondary battery according to the present invention has a large negative electrode mainly composed of a compound composed of at least one of silicon, germanium, and tin, nitrogen, and oxygen. Have the ability. Therefore, in a non-aqueous electrolyte secondary battery using such a negative electrode material, the energy density per volume can be greatly improved and a high negative electrode capacity can be obtained as compared with the conventional battery.
[0030]
By the way, when forming a non-aqueous electrolyte secondary battery using this negative electrode material, it is preferable that the positive electrode contains sufficient lithium. For example, a lithium composite metal oxide represented by the general formula Li x MO 2 (wherein M represents at least one of Co, Ni, and Mn, and 0 <x <1), or an interlayer containing lithium A compound is preferably used. In particular, when LiCoO 2 is used, good characteristics are exhibited.
[0031]
Lithium composite metal oxides are lithium carbonates, nitrates, oxides or hydroxides, and carbonates, nitrates, oxides or hydroxides of cobalt, manganese, nickel, etc., depending on the desired composition. It can be adjusted by pulverizing and mixing and firing in a temperature range of 600 to 1000 ° C. in an oxygen atmosphere.
[0032]
Since the non-aqueous electrolyte secondary battery according to the present invention aims to achieve a high capacity, the above-described positive electrode is in a steady state (for example, after repeated charging and discharging about 5 times), and the negative electrode It is necessary to include lithium corresponding to a charge / discharge capacity of 250 mAh or more per 1 g of material, preferably including lithium corresponding to a charge / discharge capacity of 300 mAh or more, and including lithium corresponding to a charge / discharge capacity of 350 mAh or more. More preferred. Note that it is not always necessary to supply all lithium from the positive electrode material. In short, it is sufficient that lithium corresponding to a charge / discharge capacity of 250 mAh or more per 1 g of the negative electrode material exists in the battery system. The amount of lithium is determined by measuring the discharge capacity of the battery.
[0033]
The nonaqueous electrolytic solution used in the present invention is prepared by appropriately combining an organic solvent and an electrolyte, and any of these organic solvents and electrolytes can be used as long as they are used in this type of battery. .
[0034]
Illustrative examples of the organic solvent include propylene carbonate, ethylene carbonate, diethyl carbonate, methyl ethyl carbonate, 1,2-dimethoxyethane, 1,2-diethoxyethane, γ-butyrolactone, tetrahydrofuran, 2-methyltetrahydrofuran, 1 , 3-dioxolane, 4-methyl-1,3-dioxolane, diethyl ether, sulfolane, methyl sulfolane, acetonitrile, propyl nitrile, anisole, acetic acid ester, propionic acid ester, etc., can be used alone. Or you may use it, mixing 2 or more types.
[0035]
As the electrolyte, lithium salts such as LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , LiB (C 6 H 5 ) 4 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiCl, and LiBr can be used.
[0036]
【Example】
Hereinafter, the present invention will be described based on specific experimental results.
[0037]
<Evaluation of negative electrode capacity>
Example 1
First, the reagent amorphous SiO 2 (average particle size of about 10 μm) and the reagent Si (average particle size of about 1 μm) were weighed to a molar ratio of 1: 3 and mixed in an agate mortar. This mixture was placed in an alumina boat and heat-treated in a tubular electric furnace at 1450 ° C. for 5 hours at a nitrogen flow rate of 5 liters / minute.
[0038]
The obtained compound was pulverized in an agate mortar and subjected to X-ray diffraction measurement. As a result, the d-value (interplanar distance) and relative intensity of the diffraction peak almost coincided with the literature values, so that Si 2 N 2 O and Identified.
[0039]
Next, artificial graphite as a conductive agent was mixed with this Si 2 N 2 O at a ratio of Si 2 N 2 O: artificial graphite = 2: 1 to prepare a sample. After this sample was dried at 120 ° C. for 2 hours in an argon gas atmosphere, 10% by weight of polyvinylidene fluoride as a binder was added, and dimethylformamide was mixed and dried to prepare a negative electrode mixture. Then, 37 mg of this negative electrode mixture was molded into a pellet having a diameter of 15.5 mm together with a nickel mesh as a current collector to produce a Si 2 N 2 O electrode.
[0040]
Comparative Example 1
Petroleum pitch was oxidized to prepare a carbon precursor, and carbonized in a nitrogen atmosphere at 500 ° C. for 5 hours. Next, this was pulverized by a mill, about 10 g was charged in a crucible, and the temperature was increased at a rate of 5 ° C./min, at an ultimate temperature of 1100 ° C. Firing was performed under the condition of a holding time of 1 hour. And after cooling, it grind | pulverized with the mortar and classified to 38 micrometers or less with the mesh, and produced the sample.
[0041]
Next, after drying this sample for 2 hours at 120 ° C. in an argon gas atmosphere, 10% by weight equivalent of polyvinylidene fluoride as a binder was added, and dimethylformamide was mixed as a solvent and dried to obtain a negative electrode mixture. Prepared. Then, 37 mg of this negative electrode mixture was molded into a pellet having a diameter of 15.5 mm together with a nickel mesh as a current collector to produce a carbon electrode.
[0042]
Comparative Example 2
A graphite electrode was produced in the same manner as in Comparative Example 1 except that artificial graphite was used as a sample.
[0043]
Characteristic evaluation For each electrode produced in each of the examples and comparative examples, lithium metal as a counter electrode, a polypropylene porous membrane as a separator, ethylene carbonate and dimethyl carbonate as a non-aqueous electrolyte, etc. A coin-type test cell having a diameter of 20 mm and a thickness of 2.5 mm using LiPF 6 dissolved in a volumetric solvent at a ratio of 1 mol / l (Example 1, Comparative Example 1, Comparative Example 2). Was made.
[0044]
Each coin-type test cell having the above configuration was charged / discharged under the following conditions. This evaluation is intended to evaluate the doping and undoping ability of lithium as the negative electrode material, so the process of doping lithium into the target negative electrode material, that is, the process of decreasing the voltage of the test cell is charged. Call it. Conversely, the process of dedoping lithium, that is, the process of increasing the test cell voltage is called discharge.
[0045]
Charging: Charging was performed at a constant current of 1 mA until the voltage of the test cell reached 0V, and after reaching 0V, charging was performed by decreasing the current so as to keep the cell voltage at 0V. When the current value fell below 20 μA, the charging was terminated.
[0046]
Discharge: Discharge was performed at a constant current of 0.5 mA, and when the cell voltage exceeded 1.5 V, the discharge was terminated and the discharge capacity was determined.
[0047]
The results are shown in Table 1 and FIG.
[0048]
[Table 1]
[0049]
From the results of Table 1 and FIG. 1, it can be seen that the Si 2 N 2 O electrode exhibits a larger negative electrode capacity than the conventionally used carbon electrode of Comparative Example 1. Further, artificial graphite used as a conductive agent also acts as an electrode by doping and dedoping lithium, but in Example 1 using an Si 2 N 2 O electrode, it is larger than Comparative Example 2 using artificial graphite. It can be seen that the negative electrode capacity is shown.
[0050]
Therefore, it can be seen that the Si 2 N 2 O electrode is excellent in lithium doping / dedoping ability and exhibits a larger negative electrode capacity than that of conventionally used negative electrode materials.
[0051]
<Evaluation of battery characteristics>
A coin-type battery having an outer diameter of 20 mm and a thickness of 2.5 mm shown in FIG. 2 was produced as shown below.
[0052]
Example 2
First, the positive electrode pellet 1 was produced as follows. LiCoO 2 , artificial graphite as a conductive agent, and polyvinylidene fluoride as a binder were mixed, and dimethylformamide was added as a solvent and kneaded to obtain a slurry mixture. After this mixture was dried, it was pulverized in an agate mortar and pressure-molded with an aluminum mesh to obtain a positive electrode pellet 1.
[0053]
As the negative electrode pellet 2, the Si 2 N 2 O electrode produced in Example 1 was used.
[0054]
Next, as shown in FIG. 2, the positive electrode pellet 1 and the negative electrode pellet 2 were stored in a positive electrode can 4 and a negative electrode cup 5, respectively. And the positive electrode pellet 1 and the negative electrode pellet 2 were laminated | stacked through the separator 3, the electrolyte solution was inject | poured, and it crimped with the gasket 6, and produced the coin-type battery. As the electrolytic solution, one obtained by dissolving 1 mol / liter of LiPF 6 in an equal volume mixed solvent of ethylene carbonate and dimethyl carbonate was used.
[0055]
Comparative Example 3
A coin-type battery was produced in the same manner as in Example 2 except that the carbon electrode derived from the petroleum pitch produced in Comparative Example 1 was used for the negative electrode pellet.
[0056]
Characteristic evaluation The coin-type batteries produced in Example 2 and Comparative Example 3 were charged with a constant current of 0.5 mA until the battery voltage reached 3.7V. Then, after being left for 1 hour, the battery was discharged at a constant current of 0.5 mA until the battery voltage became 2.5 V, and the time required for the discharge was measured. The results are shown in Table 2.
[0057]
[Table 2]
[0058]
From the results in Table 2, it was confirmed that the discharge time of the Si 2 N 2 O electrode was longer than that of the conventionally used carbon electrode even in the battery configuration. Therefore, it can be seen that the Si 2 N 2 O electrode can constitute a battery having a large battery capacity by selecting an appropriate positive electrode.
[0059]
<Examination of anode material>
Example 3
In a stream of argon gas containing ammonia (500 ml / min), GeO 2 as a reagent was reacted with ammonia at 870 ° C. to obtain Ge 2 N 2 O.
[0060]
The obtained compound was pulverized in an agate mortar and subjected to X-ray diffraction measurement. Since the d-value (distance between planes) and relative intensity of the diffraction peak almost matched the literature values, the obtained compound was identified as Ge 2 N 2 O.
[0061]
In the same manner as in Example 1, this compound and artificial graphite were mixed at a ratio of 2: 1, and the negative electrode capacity was evaluated in the same manner as in Example 1.
[0062]
As a result, the charge capacity was 1003 mAh / g, and the discharge capacity was 792 mAh / g.
[0063]
Example 4
Amorphous SiO 2 (average particle size: about 10 μm), reagent Si (average particle size: about 1 μm), and Al 2 O 3 powder (average particle size: 3 μm) are weighed to a molar ratio of 23: 69: 4. In the same manner as in Example 1, mixing and heat treatment were performed.
[0064]
When the obtained compound was pulverized in an agate mortar and X-ray diffraction measurement was performed precisely, the d value (surface separation distance) of the diffraction peak and the relative intensity almost matched the literature values. Al 0.16 Si 1.84 N 1.84 O 1.16 was identified.
[0065]
In the same manner as in Example 1, this compound and artificial graphite were mixed at a ratio of 2: 1, and the negative electrode capacity was evaluated in the same manner as in Example 1.
[0066]
As a result, the charge capacity was 1133 mAh / g, and the discharge capacity was 895 mAh / g.
[0067]
Example 5
Amorphous SiO 2 (average particle size of about 10 μm), reagent Si (average particle size of about 1 μm), and MgO powder were weighed in a molar ratio of 10: 30: 1 and mixed in the same manner as in Example 1. Heat treatment was performed.
[0068]
The obtained compound was pulverized in an agate mortar and X-ray diffraction measurement was performed precisely. As a result, the same d value and relative intensity as Si 2 N 2 O were obtained, and no other diffraction peak was observed. Mg is substituted with Si in the compound in the same manner as Al in the material of Example 4, and since the amount thereof is very small, it is considered that only the diffraction peak of Si 2 N 2 O was observed.
[0069]
In the same manner as in Example 1, this compound and artificial graphite were mixed at a ratio of 2: 1, and the negative electrode capacity was evaluated in the same manner as in Example 1.
[0070]
As a result, the charge capacity was 1147 mAh / g, and the discharge capacity was 934 mAh / g.
[0071]
Example 6
Amorphous SiO 2 (average particle size: about 10 μm), reagent Si (average particle size: about 1 μm), and KOH were weighed in a molar ratio of 10: 30: 1 and mixed. In mixing, amorphous SiO 2 and Si were first mixed in an agate mortar. KOH was dissolved in pure water and mixed with a mixture of amorphous SiO 2 and Si. Subsequently, mixing and heat treatment were performed in the same manner as in Example 1.
[0072]
The obtained compound was pulverized in an agate mortar and subjected to precise X-ray diffraction measurement. As a result, d values and relative intensities similar to those of Si 2 N 2 O were obtained.
[0073]
In the same manner as in Example 1, this compound and artificial graphite were mixed at a ratio of 2: 1, and the negative electrode capacity was evaluated in the same manner as in Example 1.
[0074]
As a result, the charge capacity was 1050 mAh / g, and the discharge capacity was 770 mAh / g.
[0075]
Example 7
Amorphous SiO 2 (average particle size of about 10 μm), reagent Si (average particle size of about 1 μm), and CaO powder were weighed to a molar ratio of 10: 30: 1 and mixed in the same manner as in Example 1. Heat treatment was performed.
[0076]
The obtained compound was pulverized in an agate mortar and X-ray diffraction measurement was performed precisely. As a result, the same d value and relative intensity as Si 2 N 2 O were obtained, and no other diffraction peak was observed. Ca is substituted with Si in the compound in the same manner as Al in the material of Example 4, and since the amount thereof is very small, it is considered that only the diffraction peak of Si 2 N 2 O was observed.
[0077]
In the same manner as in Example 1, this compound and artificial graphite were mixed at a ratio of 2: 1, and the negative electrode capacity was evaluated in the same manner as in Example 1.
[0078]
As a result, the charge capacity was 1254 mAh / g, and the discharge capacity was 884 mAh / g.
[0079]
Example 8
Amorphous SiO 2 (average particle size: about 10 μm), reagent Si (average particle size: about 1 μm), and NaOH were weighed in a molar ratio of 10: 30: 1 and mixed. In mixing, amorphous SiO 2 and Si were first mixed in an agate mortar. NaOH was dissolved in pure water and mixed with a mixture of amorphous SiO 2 and Si. Subsequently, mixing and heat treatment were performed in the same manner as in Example 1.
[0080]
The obtained compound was pulverized in an agate mortar and subjected to precise X-ray diffraction measurement. As a result, d values and relative intensities similar to those of Si 2 N 2 O were obtained.
[0081]
In the same manner as in Example 1, this compound and artificial graphite were mixed at a ratio of 2: 1, and the negative electrode capacity was evaluated in the same manner as in Example 1.
[0082]
As a result, the charge capacity was 1091 mAh / g, and the discharge capacity was 821 mAh / g.
[0083]
As described above, it can be seen that the electrodes of Examples 3 to 8 show a large negative electrode capacity as in Example 1. Thus, compared with the case where only artificial graphite is used as the negative electrode material, the negative electrode capacity is greatly increased, and a battery having a large capacity can be configured.
[0084]
In addition, the composition of the general formula M x N y O z (M is at least one element of Si, Ge, and Sn) must be strictly x: y: z = 2: 2: 1. And 1.4 <x <2.1, 1.4 <y <2.1, and 0.9 <z <1.6.
[0085]
【The invention's effect】
As is apparent from the above description, according to the present invention, a negative electrode material excellent in lithium doping / dedoping ability can be obtained, and a large negative electrode capacity can be obtained. Moreover, a nonaqueous electrolyte secondary battery having a large capacity can be obtained by combining with an appropriate positive electrode.
[Brief description of the drawings]
FIG. 1 is a characteristic diagram showing a discharge curve of a negative electrode material produced in this example.
FIG. 2 is a cross-sectional view illustrating a configuration of a coin-type battery manufactured in this example.
[Explanation of symbols]
1 positive electrode, 2 negative electrode, 3 separator, 4 positive electrode can, 5 negative electrode can, 6 gasket

Claims (13)

  1. Formula M x N y O z (M is Si, Ge, at least one of the elements Sn, x, y, z respectively 1.4 <x <2.1,1.4 <y < 2 1. 0.9 <z <1.6.) A negative electrode material characterized in that
  2. The negative electrode material according to claim 1, wherein the compound is Si 2 N 2 O.
  3. The negative electrode material according to claim 1, wherein the compound is Ge 2 N 2 O.
  4. The negative electrode material according to claim 1, wherein the compound is Sn 2 N 2 O.
  5.   The negative electrode material according to claim 1, wherein the compound contains at least one of lithium, sodium, potassium, magnesium, calcium, and aluminum.
  6. Formula M x N y O z (M is at least one element of Si, Ge, and Sn, and x, y, and z are 1.4 <x <2.1, 1.4 <y <2.1, and 0.9 <z, respectively. <1.6.) The negative electrode characterized by including the compound represented by this.
  7. The negative electrode according to claim 6, wherein the negative electrode contains at least one of a carbonaceous material, a metal powder, and a conductive polymer.
  8. Formula M x N y O z (M is Si, Ge, at least one of the elements Sn, x, y, z respectively 1.4 <x <2.1,1.4 <y < 2 .1,0.9 <a z <1.6. and the negative electrode containing a compound represented by), the positive electrode and the non-aqueous non-aqueous electrolyte secondary to electrolyte and wherein Rukoto to have a battery.
  9. The nonaqueous electrolyte secondary battery according to claim 8 , wherein the compound is Si 2 N 2 O.
  10. The non-aqueous electrolyte secondary battery according to claim 8 , wherein the compound is Ge 2 N 2 O.
  11. The non-aqueous electrolyte secondary battery according to claim 8 , wherein the compound is Sn 2 N 2 O.
  12. The above compound, lithium, sodium, potassium, magnesium, calcium, non-aqueous electrolyte secondary battery according to claim 8, characterized in that it contains at least one of aluminum.
  13. The non-aqueous electrolyte secondary battery according to claim 8 , wherein the negative electrode contains at least one of a carbonaceous material, a metal powder, and a conductive polymer.
JP21460398A 1997-07-29 1998-07-29 Negative electrode material and non-aqueous electrolyte secondary battery using the same Expired - Fee Related JP3918311B2 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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