WO2016136555A1 - アルカリイオン二次電池用正極活物質 - Google Patents
アルカリイオン二次電池用正極活物質 Download PDFInfo
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- WO2016136555A1 WO2016136555A1 PCT/JP2016/054557 JP2016054557W WO2016136555A1 WO 2016136555 A1 WO2016136555 A1 WO 2016136555A1 JP 2016054557 W JP2016054557 W JP 2016054557W WO 2016136555 A1 WO2016136555 A1 WO 2016136555A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a positive electrode active material used as an electrode material of an alkaline ion secondary battery such as a sodium ion secondary battery.
- lithium ion secondary batteries have established themselves as high-capacity and lightweight power supplies that are indispensable for portable electronic terminals and electric vehicles.
- lithium used in lithium ion secondary batteries is concerned about problems such as soaring global raw materials, research on sodium ion secondary batteries using sodium as an alternative to lithium has also been conducted. Yes.
- Non-Patent Document 1 discloses a positive electrode active material made of Na 2 (Fe 1-y Mn y ) P 2 O 7 (0 ⁇ y ⁇ 1).
- Non-Patent Document 1 It has been reported that the positive electrode active material made of Na 2 (Fe 1-y Mn y ) P 2 O 7 described in Non-Patent Document 1 has a rapid capacity drop as the Mn content is increased in order to increase the voltage. Has been. Therefore, the above active material has a problem that it is difficult to achieve both a high voltage and a high capacity and has a low energy density, and thus does not have charge / discharge characteristics that can withstand actual specifications.
- an object of the present invention is to provide a positive electrode active material for an alkaline ion secondary battery having high energy density and excellent charge / discharge characteristics.
- the positive electrode active material for an alkaline ion secondary battery of the present invention has the following oxide conversion mol%: Na 2 O + Li 2 O 20-55%, CrO + FeO + MnO + CoO + NiO 10-60%, P 2 O 5 + SiO 2 + B 2 O 3 20 It is characterized by containing ⁇ 55% and containing 50% by mass or more of an amorphous phase.
- ⁇ + ⁇ + Means the total content of each component.
- the positive electrode active material for alkaline ion secondary batteries of the present invention (hereinafter also simply referred to as positive electrode active material) is characterized by containing an amorphous phase in an amount of 50% by mass or more, resulting in alkali ions (sodium ions). And lithium ion).
- positive electrode active material is characterized by containing an amorphous phase in an amount of 50% by mass or more, resulting in alkali ions (sodium ions). And lithium ion).
- alkali ions sodium ions
- lithium ion lithium ion
- the positive electrode active material for an alkaline ion secondary battery of the present invention contains Na 2 O + Li 2 O 20 to 55%, FeO + MnO + NiO 10 to 60%, and P 2 O 5 20 to 55% in terms of mol% in terms of the following oxides. It is preferable.
- the positive electrode active material for an alkaline ion secondary battery of the present invention contains Na 2 O + Li 2 O 20 to 55%, FeO 10 to 60%, and P 2 O 5 20 to 55% in terms of the mol% in terms of the following oxides. It is preferable.
- the positive electrode active material for an alkaline ion secondary battery of the present invention is 20% to 55% of Na 2 O, 10% to 60% of CrO + FeO + MnO + CoO + NiO, 20% to 55% of P 2 O 5 + SiO 2 + B 2 O 3 in terms of the following oxide equivalents.
- the positive electrode active material for an alkaline ion secondary battery of the present invention is Li 2 O 20 to 55%, CrO + FeO + MnO + CoO + NiO 10 to 60%, P 2 O 5 + SiO 2 + B 2 O 3 20 in the following oxide conversion mol%.
- a positive electrode active material for lithium ion secondary batteries containing ⁇ 55% can be obtained.
- a positive electrode active material for an alkaline ion secondary battery having a high energy density and excellent charge / discharge characteristics can be provided.
- the positive electrode active material for an alkaline ion secondary battery of the present invention has the following oxide conversion mol%: Na 2 O + Li 2 O 20-55%, CrO + FeO + MnO + CoO + NiO 10-60%, P 2 O 5 + SiO 2 + B 2 O 3 20 Contains ⁇ 55%. The reason for limiting the composition in this way will be described below. In the following description of the content of each component, “%” means “mol%” unless otherwise specified.
- Na 2 O and Li 2 O serve as a supply source of alkali ions that move between the positive electrode active material and the negative electrode active material during charge and discharge.
- the content of Na 2 O + Li 2 O is 20 to 55%, preferably 23 to 52%, particularly preferably 25 to 40%.
- Na 2 O + Li content of 2 O is too small, storage, since the alkali ions involved in emission is reduced, there is a tendency that the charge-discharge capacity decreases.
- the content of Na 2 O + Li 2 O is too large, different crystals that do not participate in charging / discharging such as Na 3 PO 4 and Li 3 PO 4 tend to precipitate, and the charge / discharge capacity tends to decrease.
- the positive electrode active material for an alkaline ion secondary battery contains Na 2 O, CrO + FeO + MnO + CoO + NiO, and P 2 O 5 + SiO 2 + B 2 O 3 , the content of Na 2 O is 20 to 55%, preferably 23 to 52%, particularly preferably 25 to 40%.
- Transition metal oxides CrO, FeO, MnO, CoO, and NiO have a role of increasing the redox potential of the positive electrode active material by changing the valence during charge and discharge.
- MnO and NiO are highly effective in increasing the redox potential.
- FeO also has an effect of stabilizing the structure of the positive electrode active material during charge and discharge and improving cycle characteristics. Therefore, it is preferable to select a transition metal oxide as appropriate according to the intended characteristics, and to use it in some cases.
- Cr, Fe, Mn, Co, and Ni are preferably low valent, particularly divalent.
- an oxidation reaction of transition metal ions (for example, Fe 2+ ⁇ Fe 3+ ) proceeds as charge compensation.
- transition metal ions for example, Fe 2+ ⁇ Fe 3+
- the proportion of low-valent (particularly divalent) transition metal ions contributing to the charge compensation increases, the amount of alkali ions released from the positive electrode active material also increases, and a high charge / discharge capacity is likely to be exhibited.
- the content of CrO + FeO + MnO + CoO + NiO is 10 to 60%, preferably 15 to 55%, particularly preferably 30 to 50%. If the content of CrO + FeO + MnO + CoO + NiO is too small, the number of transition metal elements that cause oxidation-reduction reactions decreases, so that the number of alkali ions involved in occlusion and release decreases, and the charge / discharge capacity tends to decrease. On the other hand, if the content of CrO + FeO + MnO + CoO + NiO is too large, different crystals that are not involved in charging / discharging such as NaFePO 4 and Li 3 PO 4 tend to precipitate, and the charge / discharge capacity tends to decrease.
- the content of FeO + MnO + NiO is preferably 10 to 60%, 15 to 55%, particularly preferably 30 to 50%.
- the contents of CrO, FeO, MnO, CoO and NiO are preferably 0 to 60%, 10 to 60%, 15 to 55%, particularly 30 to 50%, respectively.
- the content of transition metal oxides other than divalent eg, Cr 2 O 3 , Fe 2 O 3 , MnO 2, etc. is expressed in terms of divalent transition metal oxides.
- P 2 O 5 , SiO 2 and B 2 O 3 are components that form a three-dimensional network structure and stabilize the structure of the positive electrode active material. By containing these components, an amorphous phase is easily formed, and alkali ion conductivity is easily improved.
- P 2 O 5 is preferable because it is excellent in alkali ion conductivity.
- the content of P 2 O 5 + SiO 2 + B 2 O 3 is 20 to 55%, preferably 23 to 52%, particularly preferably 25 to 40%. When P 2 O 5 + content of SiO 2 + B 2 O 3 is too small, the effect is difficult to obtain.
- P 2 O 5 + SiO 2 + B 2 O 3 are preferably 0 to 55%, 20 to 55%, 23 to 52%, particularly 25 to 40%, respectively.
- the content of the amorphous phase in the positive electrode active material is 50% or more by mass%, preferably 70% or more, 80% or more, 85% or more, 95% or more, and particularly 100%. If the content of the amorphous phase is too small, alkali ion conductivity tends to be lowered, and charge / discharge characteristics (particularly, high-speed charge / discharge characteristics) and cycle characteristics are likely to be lowered.
- the positive electrode active material of the present invention is easily produced by a method (melting and quenching method) described later, thereby achieving a desired amorphous phase content.
- the content of the amorphous phase in the positive electrode active material peaks in the crystalline diffraction line and the amorphous halo in the diffraction line profile of 10-60 ° with 2 ⁇ value obtained by powder X-ray diffraction measurement using CuK ⁇ ray.
- Required by separating Specifically, the integrated intensity obtained by peak-separating a broad diffraction line (amorphous halo) at 10 to 45 ° from the total scattering curve obtained by subtracting the background from the diffraction line profile is Ia, 10
- the content Xg of the amorphous phase can be obtained from the following equation.
- the shape of the positive electrode active material is not particularly limited, but is preferably powder. If it is in powder form, the specific surface area becomes large and the number of sites for occlusion and release of alkali ions increases, so that the charge / discharge capacity is easily improved.
- the average particle size of the positive electrode active material is preferably 0.1 to 20 ⁇ m, 0.3 to 15 ⁇ m, 0.5 to 10 ⁇ m, particularly preferably 0.6 to 5 ⁇ m.
- the maximum particle size is preferably 150 ⁇ m or less, 100 ⁇ m or less, 75 ⁇ m or less, and particularly preferably 55 ⁇ m or less.
- the average particle size or the maximum particle size is too large, it becomes difficult to occlude and release alkali ions during charge / discharge, and the charge / discharge capacity tends to decrease.
- the average particle size is too small, the powder is in a poorly dispersed state when formed into a paste, and it tends to be difficult to produce a uniform electrode.
- the average particle size and the maximum particle size are D50 (50% volume cumulative diameter) and D99 (99% volume cumulative diameter), respectively, as the median diameter of primary particles, and were measured by a laser diffraction particle size distribution analyzer. Value.
- raw material powder is prepared so as to have the above composition to obtain a raw material batch.
- the obtained raw material batch is melted.
- the melting temperature may be appropriately adjusted so that the raw material batch is sufficiently dissolved to obtain a homogeneous melt.
- the melting temperature is preferably 800 ° C. or higher, particularly 900 ° C. or higher.
- the upper limit is not particularly limited, but if the melting temperature is too high, energy loss and alkali component evaporation will occur, and it is preferably 1500 ° C. or lower, particularly 1400 ° C. or lower.
- the Fe element tends to be oxidized to trivalent.
- FeO when used as a raw material, it easily changes to Fe 2 O 3 when melted in the atmosphere.
- the proportion of trivalent Fe ions in the positive electrode active material is increased, the amount of divalent Fe ions contributing to charge compensation is reduced, and the initial charge / discharge capacity is likely to be reduced. Therefore, by performing melting in a reducing atmosphere or an inert atmosphere, it is possible to suppress oxidation of Fe ions during melting and to obtain a positive electrode active material excellent in initial charge / discharge characteristics.
- a reducing gas In order to melt in a reducing atmosphere, it is preferable to supply a reducing gas into the melting tank.
- a mixed gas containing 90% to 99.5% N 2 , 0.5% to 10% H 2 , particularly 92% to 99% N 2 , and 1% to 8% H 2 is used. preferable.
- an inert gas When melting in an inert atmosphere, it is preferable to supply an inert gas into the melting tank.
- the inert gas it is preferable to use any of nitrogen, argon, and helium.
- the reducing gas or the inert gas may be supplied to the upper atmosphere of the melt in the melting tank, may be supplied directly from the bubbling nozzle into the melt, or both methods may be performed simultaneously.
- the composite oxide As the raw material powder, the ratio of the amorphous phase can be improved. Moreover, it becomes easy to obtain the positive electrode active material excellent in homogeneity, and it becomes easy to stabilize the charge / discharge capacity of the alkaline ion secondary battery using the positive electrode active material.
- the composite oxide include sodium metaphosphate (NaPO 3 ), tribasic sodium phosphate (Na 3 PO 4 ), lithium metaphosphate (LiPO 3 ), and tertiary lithium phosphate (Li 3 PO 4 ).
- the obtained melt is cooled and solidified (melt-solidified product) to obtain a positive electrode active material containing an amorphous phase.
- the molding method is not particularly limited.
- the melt may be poured between a pair of cooling rolls and molded into a film while rapidly cooling, or the melt may be poured into a mold and molded into an ingot. It doesn't matter.
- melt-solidified substance contains a trivalent Fe ion
- reducing Fe ions firing in a reducing atmosphere.
- H 2 gas in the case of using H 2 gas, in order to reduce the risk of explosion during the firing, it is preferred to mix the inert gas such as N 2.
- the reducing gas contains, by volume, N 2 90 to 99.9%, H 2 0.1 to 10%, N 2 90 to 99.5%, and H 2 0.5 to 10%. %, In particular N 2 92 to 99%, and H 2 preferably 1 to 4%.
- the firing temperature is preferably higher than the glass transition point of the melt-solidified material and lower than the crystallization temperature, specifically 350 ° C. to 610 ° C., 400 ° C. to 600 ° C., 420 ° C. to 550 ° C. It is preferably 425 to 450 ° C. If the calcination temperature is too low, Fe ions in the molten solidified product are not easily reduced from trivalent to divalent. On the other hand, if the firing temperature is too high, crystals are precipitated from the molten solidified product, and the proportion of the amorphous phase in the obtained positive electrode active material tends to decrease.
- the holding time of the maximum temperature in firing is preferably 10 minutes or more, particularly preferably 30 minutes or more. If the holding time is too short, the applied thermal energy is small, so that the Fe ions in the molten solidified product are hardly reduced from trivalent to divalent.
- the upper limit is not particularly limited, but when the melted solid is in a powder form, if the holding time is too long, the powder is excessively fused with each other, and the charge / discharge capacity of the obtained positive electrode active material is likely to decrease. .
- an electric heating furnace for the firing, an electric heating furnace, a rotary kiln, a microwave heating furnace, a high-frequency heating furnace, or the like can be used.
- electroconductivity can be provided to the positive electrode active material obtained by mixing the molten solidified material and conductive carbon while pulverizing them. Further, trivalent Fe ions in the melt-solidified product can be efficiently reduced to divalent, and a positive electrode active material having high charge / discharge capacity and good cycle characteristics can be easily obtained.
- the carbon source highly conductive carbon black such as acetylene black and ketjen black, carbon powder such as graphite, carbon fiber, and the like can be used. Of these, acetylene black having a high electron conductivity is preferable.
- the mixing ratio of the molten solidified product and the conductive carbon is mass%, the molten solidified product 80 to 99.5%, the conductive carbon 0.5 to 20%, especially the molten solidified product 85 to 98%, the conductive carbon 2 to It is preferably 15%.
- the mixing ratio of the molten solidified material and the conductive carbon is within the above range, the effect of improving the charge / discharge capacity and the cycle characteristics is easily obtained.
- Examples of the method of mixing while pulverizing include a method using a general pulverizer such as a mortar, raking machine, ball mill, attritor, vibration ball mill, satellite ball mill, planetary ball mill, jet mill, and bead mill.
- a general pulverizer such as a mortar, raking machine, ball mill, attritor, vibration ball mill, satellite ball mill, planetary ball mill, jet mill, and bead mill.
- a planetary ball mill it is preferable to use a planetary ball mill.
- the planetary ball mill is capable of efficiently generating very high impact energy while rotating the pot while the pot rotates, and can uniformly disperse the conductive carbon in the molten solidified product.
- an amorphous phase is easily formed in the melt-solidified product.
- the positive electrode active material of the present invention can be used for an alkaline ion secondary battery (a sodium ion secondary battery or a lithium ion secondary battery) using an electrolytic solution such as an aqueous solvent, a non-aqueous solvent, or an ionic liquid. It can also be used for an all-solid alkaline ion secondary battery (an all-solid sodium ion secondary battery or an all-solid lithium ion secondary battery) using a solid electrolyte.
- Tables 1 and 2 show Examples 1 to 8 and Comparative Examples 1 to 3.
- the melt was poured onto an iron plate and rapidly cooled to obtain a melt-solidified product.
- This melt-solidified product was pulverized with a planetary ball mill (P7 manufactured by Fritsch) to obtain a powdered positive electrode active material.
- the powder obtained above was crystallized by firing at 620 ° C. for 3 hours in nitrogen and evaluated as a positive electrode active material.
- the obtained slurry was coated on a 20 ⁇ m thick aluminum foil as a positive electrode current collector, dried at 70 ° C. in a dryer, and then between a pair of rotating rollers
- the electrode sheet was obtained by pressing at 1 t / cm 2 .
- the electrode sheet was punched to a diameter of 11 mm with an electrode punching machine and dried at 160 ° C. for 6 hours to obtain a circular working electrode.
- a test battery was manufactured by laminating a separator made of a dried polypropylene porous membrane having a diameter of 16 mm (Celguard # 2400 manufactured by Hoechst Celanese) and metallic sodium as a counter electrode.
- the test battery was assembled in an argon atmosphere with a dew point temperature of ⁇ 70 ° C. or lower and an oxygen concentration of less than 0.2 ppm.
- (D) Charging / discharging test The charging / discharging test of the sodium ion secondary battery was performed as follows. CC (constant current) charging (sodium ion release from the positive electrode active material) was performed at 30 ° C. from an open circuit voltage (OCV) to 4.3 V. Next, CC discharge (sodium ion occlusion in the positive electrode active material) was performed from 4.3 V to 1.5 V. The charge / discharge C rate was 0.1 C. From the obtained charge / discharge curve, the discharge capacity in the first charge / discharge cycle (the amount of electricity discharged from the unit mass of the positive electrode active material), the average discharge voltage, and the energy density represented by the product thereof were determined. The results are shown in Table 1.
- the positive electrode active materials of Examples 1 to 5 had a high discharge capacity of 90 mAh / g or more and an energy density of 258 Wh / kg or more.
- the positive electrode active materials of Comparative Examples 1 and 2 had a discharge capacity as low as 89 mAh / g or less and an energy density as low as 250 Wh / kg or less.
- the charge / discharge test of the lithium ion secondary battery was performed as follows. CC charging (lithium ion release from the positive electrode active material) was performed at 30 ° C. from an open circuit voltage (OCV) to 4.8 V. Next, CC discharge (lithium ion occlusion in the positive electrode active material) was performed from 4.8 V to 2.0 V. The charge / discharge C rate was 0.1 C. From the obtained charge / discharge curve, the discharge capacity and average discharge voltage and the energy density in the first charge / discharge cycle were determined. The results are shown in Table 2.
- the positive electrode active materials of Examples 6 to 8 had a high discharge capacity of 70 mAh / g or more and an energy density of 258 Wh / kg or more.
- the positive electrode active material of Comparative Example 3 had a discharge capacity as low as 14 mAh / g and an energy density as low as 50 Wh / kg.
- the positive electrode active material for alkaline ion secondary batteries of the present invention is suitable as an electrode material for alkaline ion secondary batteries used in electric vehicles, electric tools, backup emergency power supplies, and the like.
Abstract
Description
あるいは、本発明のアルカリイオン二次電池用正極活物質は、下記酸化物換算のモル%で、Li2O 20~55%、CrO+FeO+MnO+CoO+NiO 10~60%、P2O5+SiO2+B2O3 20~55%を含有するリチウムイオン二次電池用正極活物質とすることができる。
リン酸水素ナトリウム(NaH2PO4)、シュウ酸鉄(FeC2O4・2H2O)、シュウ酸マンガン(MnC2O4)、リン酸ニアンモニウム((NH4)2HPO4)、液体リン酸(H3PO4)、炭酸ナトリウム(Na2CO3)、メタリン酸リチウム(LiPO3)、炭酸リチウム(Li2CO3)等を原料とし、表1、2に記載の組成となるように調合して原料バッチを作製した。原料バッチを900℃にて30分間、窒素雰囲気中にて溶融した。溶融物を鉄板上に流し込み急冷することで、溶融固化物を得た。この溶融固化物を遊星ボールミル(Fritsch社製P7)で粉砕して粉末状の正極活物質を得た。なお、比較例1~3については、上記で得られた粉末を窒素中620℃で3時間焼成することで結晶化させたものを正極活物質として評価した。
上記で得られた正極活物質と、導電性炭素としてデンカブラックとを、質量%で、正極活物質90%、デンカブラック10%の割合で秤量し、遊星ボールミルに投入した。大気雰囲気中で800rpm、15分間の粉砕混合工程を4回繰り返すことにより正極活物質に導電性炭素を複合化させた。
(c-1)ナトリウムイオン二次電池の作製(実施例1~5、比較例1、2)
導電性炭素と複合化後の正極活物質に対し、バインダーとしてポリフッ化ビニリデンを用いて、複合化後の正極活物質:バインダー=95:5(質量比)となるように秤量し、これらをN-メチルピロリドンに分散した後、自転・公転ミキサーで十分に撹拌してスラリー化した。
対極として金属リチウム、電解液として1M LiPF6溶液/EC:DEC=1:1(体積比)を用いたこと以外は、上記のナトリウムイオン二次電池と同様にして試験電池を作製した。
ナトリウムイオン二次電池の充放電試験は次のように行った。30℃で開回路電圧(OCV)から4.3VまでCC(定電流)充電(正極活物質からのナトリウムイオン放出)を行った。次に、4.3Vから1.5VまでCC放電(正極活物質へのナトリウムイオン吸蔵)を行った。なお、充放電のCレートは0.1Cとした。得られた充放電曲線から、初回充放電サイクルにおける放電容量(正極活物質の単位質量当たりから放電された電気量)及び平均放電電圧と、それらの積で表されるエネルギー密度を求めた。結果を表1に示す。
Claims (3)
- 下記酸化物換算のモル%で、Na2O+Li2O 20~55%、CrO+FeO+MnO+CoO+NiO 10~60%、P2O5+SiO2+B2O3 20~55%を含有し、かつ、非晶質相を50質量%以上含有することを特徴とするアルカリイオン二次電池用正極活物質。
- 下記酸化物換算のモル%で、Na2O+Li2O 20~55%、FeO+MnO+NiO 10~60%、P2O5 20~55%を含有することを特徴とする請求項1に記載のアルカリイオン二次電池用正極活物質。
- 下記酸化物換算のモル%で、Na2O+Li2O 20~55%、FeO 10~60%、P2O5 20~55%を含有することを特徴とする請求項2に記載のアルカリイオン二次電池用正極活物質。
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US15/553,359 US10374229B2 (en) | 2015-02-25 | 2016-02-17 | Positive electrode active material for alkali-ion secondary batteries |
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CN110521036A (zh) * | 2017-06-27 | 2019-11-29 | 日本电气硝子株式会社 | 钠离子二次电池用正极活性物质 |
US11515534B2 (en) | 2017-06-27 | 2022-11-29 | Nippon Electric Glass Co., Ltd. | Positive electrode active material for sodium-ion secondary battery |
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