JP2012003948A - 遷移金属複合水酸化物およびリチウム複合金属酸化物 - Google Patents
遷移金属複合水酸化物およびリチウム複合金属酸化物 Download PDFInfo
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- JP2012003948A JP2012003948A JP2010138047A JP2010138047A JP2012003948A JP 2012003948 A JP2012003948 A JP 2012003948A JP 2010138047 A JP2010138047 A JP 2010138047A JP 2010138047 A JP2010138047 A JP 2010138047A JP 2012003948 A JP2012003948 A JP 2012003948A
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- Prior art keywords
- transition metal
- composite hydroxide
- lithium
- metal composite
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910052723 transition metal Inorganic materials 0.000 title claims abstract description 82
- 239000002905 metal composite material Substances 0.000 title claims abstract description 65
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- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 title claims abstract description 58
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000002131 composite material Substances 0.000 title claims abstract description 43
- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 38
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 38
- 239000011255 nonaqueous electrolyte Substances 0.000 claims abstract description 41
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 19
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 19
- 239000007774 positive electrode material Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 30
- 239000007864 aqueous solution Substances 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 22
- 239000003513 alkali Substances 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
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- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
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- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-UHFFFAOYSA-N 0.000 description 1
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- UCUUFSAXZMGPGH-UHFFFAOYSA-N penta-1,4-dien-3-one Chemical compound C=CC(=O)C=C UCUUFSAXZMGPGH-UHFFFAOYSA-N 0.000 description 1
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- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
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- LXEJRKJRKIFVNY-UHFFFAOYSA-N terephthaloyl chloride Chemical compound ClC(=O)C1=CC=C(C(Cl)=O)C=C1 LXEJRKJRKIFVNY-UHFFFAOYSA-N 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
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- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/006—Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/50—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese of the type [MnO2]n-, e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- 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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/381—Alkaline or alkaline earth metals elements
- H01M4/382—Lithium
-
- 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
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- 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
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
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Abstract
【解決手段】リチウム二次電池用正極活物質の原料である遷移金属複合水酸化物であって、該遷移金属複合水酸化物がLi以外のアルカリ金属とSO4とを少なくとも含有し、前記SO4の含有量(モル)に対する前記アルカリ金属の含有量(モル)のモル比が、0.05以上2未満である遷移金属複合水酸化物。
本発明によれば、従来のリチウム二次電池に比し、容量および出力特性において、より優れた非水電解質二次電池を与えることができ、特に、高い容量および高い電流レートにおける高出力を要求される用途、すなわち自動車用や電動工具等のパワーツール用の非水電解質二次電池に極めて有用となる。
【選択図】なし
Description
前記遷移金属複合水酸化物におけるSO4の含有量(モル)に対する前記アルカリ金属の含有量(モル)のモル比が、0.05を下回るか、2以上である場合、前記遷移金属複合水酸化物を原料として合成したリチウム複合酸化物を非水電解質二次電池としたときの容量および出力特性が小さくなるため好ましくない。また、より容量を高めるためには、SO4の含有量に対する前記アルカリ金属の含有量のモル比は0.5以上2未満であることが好ましく、1以上2未満であることがより好ましい。
(1)遷移金属元素およびSO4を含有する水溶液とアルカリとを接触させて共沈物スラリーを得る工程。
(2)該共沈物スラリーから、遷移金属複合水酸化物を得る工程。
(3)該遷移金属複合水酸化物とリチウム化合物とを混合して得られる混合物を650〜1000℃の温度で保持して焼成してリチウム複合金属酸化物を得る工程。
とくに上記(1)の工程において、Ni、Mn、FeおよびSO4を含有する水溶液を用いる場合は、Ni、Mn、Feを含有するそれぞれの原料としてそれぞれの硫酸塩を用い、Ni:Mn:Feがモル比で、上記の(1−x−y):x:yとなるように秤量して、これらを用いればよい。Feの硫酸塩としては、2価のFeの硫酸塩であることが好ましい。
(2´)該共沈物スラリーを固液分離後、洗浄、乾燥して、遷移金属複合水酸化物を得る工程。
固形分を効率よく洗浄するためには、洗浄液として水を用いることが好ましい。なお、必要に応じてアルコール、アセトンなどの水溶性有機溶媒を洗浄液に加えても良い。また、洗浄は2回以上行ってもよく、例えば、水洗浄を行った後、前記のような水溶性有機溶媒で再度洗浄することもできる。
正極活物質と導電材(アセチレンブラックと黒鉛とを9:1(重量比)で混合したもの)の混合物に、バインダーとしてPVdF(N−メチル−2−ピロリドンを有機溶媒として用いた)を、活物質:導電材:バインダー(PVdF)=86:10:4(重量比)の組成となるように加えて混練することによりペーストとし、集電体となる厚さ40μmのAl箔に該ペーストを塗布して150℃で8時間真空乾燥を行い、正極を得た。
(1)により得られた正極を用いて、コインセル(宝泉株式会社製)の下蓋にアルミ箔面を下に向けて正極を置き、その上に後述する積層フィルムセパレータ(ポリエチレン製多孔質フィルムの上に、耐熱多孔層を積層(厚み16μm))を置き、ここに電解液(エチレンカーボネート(以下、ECということがある。)とジメチルカーボネート(以下、DMCということがある。)とエチルメチルカーボネート(以下、EMCということがある。)との30:35:35(体積比)混合液にLiPF6を1モル/リットルとなるように溶解したもの(以下、LiPF6/EC+DMC+EMCと表すことがある。))を300μl注入した。次に、負極として金属リチウムを用いて、前記金属リチウムを積層フィルムセパレータの上側に置き、ガスケットを介して上蓋をし、かしめ機でかしめて非水電解質二次電池(コイン型電池R2032)を作製した。なお、電池の組み立てはアルゴン雰囲気のグローブボックス内で行った。
上記のコイン型電池を用いて、以下に示す条件で放電レート試験を実施した。放電レート試験における0.2C放電容量および5C放電容量を、それぞれ以下のようにして求めた。
試験温度25℃
充電最大電圧4.3V、充電時間8時間、充電電流0.2mA/cm2
放電時は放電最小電圧を2.5Vで一定とし、放電電流を下記のように変えて放電を行った。20C(高い電流レート)における放電容量が高ければ高いほど、高出力を示すことを意味する。
2サイクル目の放電(5C):放電電流5mA/cm2
1.遷移金属複合水酸化物の組成分析
粉末を塩酸に溶解させた後、誘導結合プラズマ発光分析法(SII製SPS3000)を用いて測定した。
1.遷移金属複合水酸化物およびリチウム複合金属酸化物の製造
ポリプロピレン製ビーカー内で、蒸留水200mlに、水酸化カリウム30.32gを添加、攪拌により溶解し、水酸化カリウムを完全に溶解させ、水酸化カリウム水溶液(アルカリ水溶液)を調製した。また、ガラス製ビーカー内で、蒸留水200mlに、硫酸ニッケル(II)六水和物18.53g、硫酸マンガン(II)一水和物12.17gおよび硫酸鉄(II)七水和物2.85g(Ni:Mn:Feのモル比で0.47:0.48:0.05)を添加、攪拌により溶解し、ニッケル−マンガン−鉄混合水溶液を得た。前記水酸化カリウム水溶液を攪拌しながら、これに前記ニッケル−マンガン−鉄混合水溶液を滴下することにより遷移金属複合水酸化物として、共沈物が生成し、共沈物スラリーを得た。また、反応終点のpHを測定したところpHは13であった。
粉末A1を用いてコイン型電池を作製し、放電レート試験を行ったところ、0.2C、5Cにおける放電容量(mAh/g)は、それぞれ、140、114と高かった。
1.遷移金属複合水酸化物およびリチウム複合金属酸化物の製造
共沈スラリーをろ過し、5000mlの蒸留水を用いて洗浄した以外は、実施例1と同様の操作を行い、遷移金属複合水酸化物として共沈物P2およびリチウム複合金属酸化物として粉末A2を得た。
粉末A2を用いてコイン型電池を作製し、放電レート試験を行ったところ、0.2C、5Cにおける放電容量(mAh/g)は、それぞれ、103、29と低かった。
1.遷移金属複合水酸化物およびリチウム複合金属酸化物の製造
共沈スラリーをろ過し、洗浄を行わなかった以外は、実施例1と同様の操作を行い、遷移金属複合水酸化物として共沈物P3およびリチウム複合金属酸化物として粉末A3を得た。
粉末A1を用いてコイン型電池を作製し、放電レート試験を行ったところ、0.2C、5Cにおける放電容量(mAh/g)は、それぞれ、130、113と低かった。
(1)塗工液の製造
NMP4200gに塩化カルシウム272.7gを溶解した後、パラフェニレンジアミン132.9gを添加して完全に溶解させた。得られた溶液に、テレフタル酸ジクロライド243.3gを徐々に添加して重合し、パラアラミドを得て、さらにNMPで希釈して、濃度2.0重量%のパラアラミド溶液(A)を得た。得られたパラアラミド溶液100gに、アルミナ粉末(a)2g(日本アエロジル社製、アルミナC、平均粒子径0.02μm)とアルミナ粉末(b)2g(住友化学株式会社製スミコランダム、AA03、平均粒子径0.3μm)とをフィラーとして計4g添加して混合し、ナノマイザーで3回処理し、さらに1000メッシュの金網で濾過、減圧下で脱泡して、スラリー状塗工液(B)を製造した。パラアラミドおよびアルミナ粉末の合計重量に対するアルミナ粉末(フィラー)の重量は、67重量%となる。
多孔質フィルムとしては、ポリエチレン製多孔質膜(膜厚12μm、透気度140秒/100cc、平均孔径0.1μm、空孔率50%)を用いた。厚み100μmのPETフィルムの上に上記ポリエチレン製多孔質膜を固定し、テスター産業株式会社製バーコーターにより、該多孔質膜の上にスラリー状塗工液(B)を塗工した。PETフィルム上の塗工された該多孔質膜を一体にしたまま、貧溶媒である水中に浸漬させ、パラアラミド多孔質膜(耐熱多孔層)を析出させた後、溶媒を乾燥させて、耐熱多孔層と多孔質フィルムとが積層された積層フィルム1を得た。積層フィルム1の厚みは16μmであり、パラアラミド多孔質膜(耐熱多孔層)の厚みは4μmであった。積層フィルム1の透気度は180秒/100cc、空孔率は50%であった。積層フィルム1における耐熱多孔層の断面を走査型電子顕微鏡(SEM)により観察をしたところ、0.03〜0.06μm程度の比較的小さな微細孔と0.1〜1μm程度の比較的大きな微細孔とを有することがわかった。尚、積層フィルムの評価は以下の方法で行った。
(A)厚み測定
積層フィルムの厚み、多孔質フィルムの厚みは、JIS規格(K7130−1992)に従い、測定した。また、耐熱多孔層の厚みとしては、積層フィルムの厚みから多孔質フィルムの厚みを差し引いた値を用いた。
(B)ガーレー法による透気度の測定
積層フィルムの透気度は、JIS P8117に基づいて、株式会社安田精機製作所製のデジタルタイマー式ガーレー式デンソメータで測定した。
(C)空孔率
得られた積層フィルムのサンプルを一辺の長さ10cmの正方形に切り取り、重量W(g)と厚みD(cm)を測定した。サンプル中のそれぞれの層の重量(Wi(g))を求め、Wiとそれぞれの層の材質の真比重(真比重i(g/cm3))とから、それぞれの層の体積を求めて、次式より空孔率(体積%)を求めた。
空孔率(体積%)=100×{1−(W1/真比重1+W2/真比重2+・・+Wn/真比重n)/(10×10×D)}
Claims (16)
- リチウム二次電池用正極活物質の原料である遷移金属複合水酸化物であって、該遷移金属複合水酸化物がLi以外のアルカリ金属とSO4とを含有し、前記SO4の含有量(モル)に対する前記アルカリ金属の含有量(モル)のモル比が、0.05以上2未満である遷移金属複合水酸化物。
- 前記モル比が、1以上2未満である請求項1に記載の遷移金属複合水酸化物。
- 前記遷移金属複合水酸化物を構成する遷移金属元素がNi、MnおよびFeである請求項1または2に記載の遷移金属複合水酸化物。
- NiとMnとFeとのモル比が1−x−y:x:y(但し、xは0.3以上0.7以下、yは0を超え0.2未満)である請求項3に記載の遷移金属複合水酸化物。
- 遷移金属複合水酸化物100モル中、前記アルカリ金属の含有量が、0.001〜0.3モルである請求項1〜4のいずれかに記載の遷移金属複合水酸化物。
- 前記アルカリ金属がKである請求項1〜5のいずれかに記載の遷移金属複合水酸化物。
- 請求項1〜6のいずれかに記載の遷移金属複合水酸化物とリチウム化合物との混合物を650〜1000℃の温度で保持して焼成することを特徴とするリチウム複合金属酸化物の製造方法。
- 以下の(1)、(2)および(3)の工程をこの順で含む請求項7に記載の製造方法。
(1)遷移金属元素およびSO4を含有する水溶液とアルカリとを接触させて共沈物スラリーを得る工程。
(2)該共沈物スラリーから、遷移金属複合水酸化物を得る工程。
(3)該遷移金属複合水酸化物とリチウム化合物とを混合して得られる混合物を650〜1000℃の温度の温度で保持して焼成してリチウム複合金属酸化物を得る工程。 - 前記水溶液が、Niの硫酸塩、Mnの硫酸塩およびFeの硫酸塩を水に溶解して得られる水溶液である請求項8に記載の製造方法。
- Feの硫酸塩が、2価のFeの硫酸塩である請求項9に記載の製造方法。
- 請求項1〜6のいずれかに記載の遷移金属複合水酸化物と、リチウム化合物との混合物を650〜1000℃の温度で保持して焼成して得られるリチウム複合金属酸化物。
- 請求項11に記載のリチウム複合金属酸化物を主成分とする非水電解質二次電池用正極活物質。
- 請求項12に記載の非水電解質二次電池用正極活物質を有する非水電解質二次電池用正極。
- 請求項13に記載の非水電解質二次電池用正極を有する非水電解質二次電池。
- さらにセパレータを有する請求項14に記載の非水電解質二次電池。
- 前記セパレータが、耐熱多孔層と多孔質フィルムとが積層されてなる積層フィルムを有するセパレータである請求項14または15に記載の非水電解質二次電池。
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