JP7427783B2 - 高温寿命特性の向上に最適化された正極およびこれを含む二次電池 - Google Patents
高温寿命特性の向上に最適化された正極およびこれを含む二次電池 Download PDFInfo
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- JP7427783B2 JP7427783B2 JP2022529076A JP2022529076A JP7427783B2 JP 7427783 B2 JP7427783 B2 JP 7427783B2 JP 2022529076 A JP2022529076 A JP 2022529076A JP 2022529076 A JP2022529076 A JP 2022529076A JP 7427783 B2 JP7427783 B2 JP 7427783B2
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
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- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
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- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical class O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 229920005608 sulfonated EPDM Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000006234 thermal black Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000002733 tin-carbon composite material Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
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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
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
- 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
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- C01P2004/45—Aggregated particles or particles with an intergrown morphology
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- H01M2004/028—Positive electrodes
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Description
本出願は、2019年12月19日付の韓国特許出願第10-2019-0170943号および2020年10月12日付の韓国特許出願第10-2020-0131094号に基づく優先権の利益を主張し、当該韓国特許出願の文献に開示されたすべての内容は本明細書の一部として含まれる。
前記正極活物質は、下記の化学式1で表されるリチウム遷移金属酸化物粉末を含み、
LiaNixCoyMzO2-wAw (化学式1)
Mは、Mn、Ti、Mg、Al、Zr、MnおよびNiからなる群より選択される少なくとも1種であり、
Aは、酸素置換型ハロゲンであり、
1.00≦a≦1.05、0.1≦x≦0.8、0.1≦y≦0.8、0.01≦z≦0.4、および0≦w≦0.001であり、
前記リチウム遷移金属酸化物粉末は、
一次粒子が凝集された形態に二次粒子化され、二次粒子の平均粒径(D50)が7μm~17μmの大粒子と、
単粒子化され、平均粒径(D50)が2μm~7μmの小粒子とから構成され、
前記大粒子と前記小粒子との混合比は、重量を基準として5:5~9:1であり、
前記正極合剤の空隙率は、22%~35%である、正極が提供される。
前記正極;
負極;および
前記正極と前記負極との間に介在する分離膜;を含む電極組立体が電解液に含浸された状態で電池ケースに内蔵されている二次電池が提供される。
正極活物質を含む正極合剤が正極集電体上に形成されている正極であって、
前記正極活物質は、下記の化学式1で表されるリチウム遷移金属酸化物粉末を含み、
LiaNixCoyMzO2-wAw (化学式1)
Mは、Mn、Ti、Mg、Al、Zr、MnおよびNiからなる群より選択される少なくとも1種であり、
Aは、酸素置換型ハロゲンであり、
1.00≦a≦1.05、0.1≦x≦0.8、0.1≦y≦0.8、0.01≦z≦0.4、および0≦w≦0.001であり、
前記リチウム遷移金属酸化物粉末は、
一次粒子が凝集された形態に二次粒子化され、二次粒子の平均粒径(D50)が7μm~17μmの大粒子と、
単粒子化され、平均粒径(D50)が2μm~7μmの小粒子とから構成され、
前記大粒子と前記小粒子との混合比は、重量を基準として5:5~9:1であり、
前記正極合剤の空隙率は、22%~35%である、正極が提供される。
(真密度-電極密度)/真密度×100
前記正極;
負極;および
前記正極と前記負極との間に介在する分離膜;を含む電極組立体が電解液に含浸された状態で電池ケースに内蔵されている二次電池が提供される。
60℃に設定された回分式バッチ(batch)型5L反応器で、ニッケルスルフェート、コバルトスルフェートおよびマンガンスルフェートを水中にて70:10:20のモル比で混合して、2M濃度の金属塩溶液を用意した。金属塩が入っている容器は反応器に入るように連結し、4M NaOH溶液と7%濃度のNH4OH水溶液を用意して、それぞれ反応器に連結した。共沈反応器(容量5L)に脱イオン水3リットルを入れた後、窒素ガスを反応器に2リットル/分の速度でパージングして水中の溶存酸素を除去し、反応器内を非酸化雰囲気とした。以後、4M NaOHを100ml投入した後、60℃の温度で1200rpmの撹拌速度でpH12.0となるように維持させた。以後、前記金属塩溶液を180ml/hr、NaOH水溶液を180ml/hr、NH4OH水溶液を10ml/hrの速度でそれぞれ投入して10時間共沈反応させて、Ni0.7Co0.1Mn0.2(OH)2のニッケルコバルトマンガン複合オキシ水酸化物(平均粒径(D50):11μm)を合成した。
製造例1で共沈反応時間を3時間に短縮した以外は、製造例1と同様の方法でNi0.7Co0.1Mn0.2(OH)2のニッケルコバルトマンガン複合オキシ水酸化物(平均粒径(D50):4.5μm)を合成した。
製造例1で共沈反応時間を3時間に短縮した以外は、製造例1と同様の方法でNi0.7Co0.1Mn0.2(OH)2のニッケルコバルトマンガン複合オキシ水酸化物(平均粒径(D50):4.5μm)を合成した。
前記製造例1で製造された大粒子の正極粉末と製造例2で製造された小粒子の正極粉末とを7:3の重量比で混合して、正極活物質として用い、バインダーとしてPVdFおよび導電材としてカーボンブラックを用いた。正極活物質:バインダー:導電材を重量比で96:2:2となるようにNMPによく混合してスラリー(粘度:5000mPa・s)を製造し、20μmの厚さのAl集電体に塗布して130℃で乾燥した後、1.7ton/cmの圧力で圧延して、74.5umの厚さの正極を製造した。
前記実施例1において、前記製造例1で製造された大粒子の正極粉末と製造例2で製造された小粒子の正極粉末とを5:5の重量比で混合して、正極活物質として用いたことを除けば、実施例1と同様に正極を製造した。
前記実施例1において、前記製造例1で製造された大粒子の正極粉末と製造例2で製造された小粒子の正極粉末とを8:2の重量比で混合して、正極活物質として用いたことを除けば、実施例1と同様に正極を製造した。
前記実施例1において、圧延時の圧力を2.1ton/cmとして電極の厚さを73.1umとしたことを除けば、実施例1と同様に正極を製造した。
前記実施例1において、圧延時の圧力を1.1ton/cmとして電極の厚さを76.8umとしたことを除けば、実施例1と同様に正極を製造した。
前記実施例1において、圧延時の圧力を0.7ton/cmの圧力で圧延して78.4umの厚さとしたことを除けば、実施例1と同様に正極を製造した。
前記製造例1で製造された大粒子の正極粉末と製造例3で製造された小粒子の正極粉末とを7:3の重量比で混合したことを除けば、実施例1と同様に正極を製造した。
前記実施例1において、前記製造例1で製造された大粒子の正極粉末と製造例2で製造された小粒子の正極粉末とを4:6の重量比で混合して、正極活物質として用いたことを除けば、実施例1と同様に正極を製造した。
前記実施例1において、圧延時の圧力を2.5ton/cmの圧力で圧延して71.8umの厚さとしたことを除けば、実施例1と同様に正極を製造した。
前記実施例1において、圧延時の圧力を0.2ton/cmの圧力で圧延して82.8umの厚さとしたことを除けば、実施例1と同様に正極を製造した。
前記実施例1~6、比較例1~4で製造された正極において正極合剤の空隙率と、電極密度を下記のように求め、その結果を表1に示した。
(真密度-電極密度)/真密度×100
前記実施例1~6および比較例1~4で製造された正極と、負極としてはリチウム金属を用い、EC:DMC:DEC=1:2:1の溶媒に1MのLiPF6が入っている電解液を用いてハーフコインセルを製造した。
Claims (8)
- 正極活物質を含む正極合剤が正極集電体上に形成されている正極であって、
前記正極活物質は、下記の化学式1で表されるリチウム遷移金属酸化物粉末を含み、
LiaNixCoyMzO2-wAw (化学式1)
Mは、Mn、Ti、Mg、AlおよびZrからなる群より選択される少なくとも1種であり、
Aは、酸素置換型ハロゲンであり、
1.00≦a≦1.05、0.1≦x≦0.8、0.1≦y≦0.8、0.01≦z≦0.4、および0≦w≦0.001であり、
前記リチウム遷移金属酸化物粉末は、
一次粒子が凝集された形態に二次粒子化され、二次粒子の平均粒径(D50)が7μm~17μmの大粒子と、
単粒子化され、平均粒径(D50)が2μm~7μmの小粒子とから構成され、
前記大粒子と前記小粒子との混合比は、重量を基準として5:5~9:1であり、
前記正極合剤の空隙率は、22%~28%であり、
前記正極の電極密度は、3.21g/cc~3.45g/ccである、正極。 - 前記大粒子の平均粒径(D50)は、9μm~11μmである、請求項1に記載の正極。
- 前記小粒子の平均粒径(D50)は、4μm~6μmである、請求項1または2に記載の正極。
- 前記大粒子と前記小粒子との混合比は、重量を基準として6:4~8:2である、請求項1から3のいずれか一項に記載の正極。
- 前記Mは、MnbAlcであり、0≦b≦1、0≦c≦1である、請求項1から4のいずれか一項に記載の正極。
- 前記正極合剤は、バインダーおよび導電材をさらに含む、請求項1から5のいずれか一項に記載の正極。
- 前記バインダーは、正極合剤の全重量を基準として1~5重量%含まれ、前記導電材は、正極合剤の全重量を基準として0.5~5重量%含まれる、請求項6に記載の正極。
- 請求項1から7のいずれか一項に記載の正極、
負極、および
前記正極と前記負極との間に介在する分離膜、を含む電極組立体が電解液に含浸された状態で電池ケースに内蔵されている二次電池。
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EP4135067A1 (en) * | 2021-08-13 | 2023-02-15 | Samsung SDI Co., Ltd. | Positive active material for rechargeable lithium battery, preparing method thereof and rechargeable lithium battery including the same |
JP7522791B2 (ja) | 2022-06-16 | 2024-07-25 | プライムプラネットエナジー&ソリューションズ株式会社 | 正極およびこれを備える非水電解質二次電池 |
CN118380570A (zh) * | 2024-06-19 | 2024-07-23 | 比亚迪股份有限公司 | 一种含锂磷酸盐材料、锂离子电池正极及制备方法与应用 |
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JP2019160571A (ja) | 2018-03-13 | 2019-09-19 | 住友化学株式会社 | リチウム金属複合酸化物粉末、リチウム二次電池用正極活物質、正極、及びリチウム二次電池 |
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US20230155123A1 (en) | 2023-05-18 |
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