JP5072110B2 - リチウム電池に用いる正極材料 - Google Patents
リチウム電池に用いる正極材料 Download PDFInfo
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- JP5072110B2 JP5072110B2 JP2008334866A JP2008334866A JP5072110B2 JP 5072110 B2 JP5072110 B2 JP 5072110B2 JP 2008334866 A JP2008334866 A JP 2008334866A JP 2008334866 A JP2008334866 A JP 2008334866A JP 5072110 B2 JP5072110 B2 JP 5072110B2
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- positive electrode
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- lithium oxide
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- lithium
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- 239000007774 positive electrode material Substances 0.000 title claims description 57
- 229910052744 lithium Inorganic materials 0.000 title claims description 47
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 45
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 57
- 229910001947 lithium oxide Inorganic materials 0.000 claims description 57
- 239000002105 nanoparticle Substances 0.000 claims description 28
- 239000011859 microparticle Substances 0.000 claims description 25
- 239000011148 porous material Substances 0.000 claims description 11
- 150000002500 ions Chemical class 0.000 claims description 10
- 239000002159 nanocrystal Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000010450 olivine Substances 0.000 claims description 6
- 229910052609 olivine Inorganic materials 0.000 claims description 6
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052596 spinel Inorganic materials 0.000 claims description 5
- 239000011029 spinel Substances 0.000 claims description 5
- 229910010272 inorganic material Inorganic materials 0.000 claims description 4
- 239000011147 inorganic material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000011368 organic material Substances 0.000 claims description 4
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910013733 LiCo Inorganic materials 0.000 claims description 2
- 230000001788 irregular Effects 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 25
- 239000002002 slurry Substances 0.000 description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 18
- 239000002243 precursor Substances 0.000 description 17
- 229910052799 carbon Inorganic materials 0.000 description 15
- 238000010586 diagram Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 239000004020 conductor Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 238000000840 electrochemical analysis Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011812 mixed powder Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 239000002931 mesocarbon microbead Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229940021013 electrolyte solution Drugs 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- -1 iron ion Chemical class 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004438 BET method Methods 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 2
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000011245 gel electrolyte Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- 238000005118 spray pyrolysis Methods 0.000 description 2
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 229910014689 LiMnO Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 229910021450 lithium metal oxide Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000131 polyvinylidene Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- 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
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Laminated Bodies (AREA)
- Secondary Cells (AREA)
Description
先ず、前駆体粉末750gを準備し、水750gと攪拌して混合し、第1のスラリーを得た。そして、第1のスラリーを造粒および焼結して粉末状の第1の球状前駆体を得た。第1のスラリーの造粒および焼結は、噴霧熱分解を含む単一ステップのプロセス、または噴霧乾燥ステップとその後の焼結ステップとを含む2ステップのプロセスによって実施することができる。また、第1のスラリーの造粒および焼結は約250℃の温度で行うことができる。
比較例において、リン酸鉄リチウム正極材料およびその作製方法は、上記実施例で説明したのと同じとした。ただし、比較例では、リン酸鉄リチウム正極材料の形成時に導電性材料は用いなかったので、3D導電ネットワークをその内部に持たない比較例のリン酸鉄リチウム正極材料が得られた。
12 正極材料層
14 正極板構造
16 リチウム酸化物
17 導電性カーボン材料
18 バインダー
20 多孔質リチウム酸化物マイクロ粒子
30 導電層に覆われた多孔質リチウム酸化物ナノ粒子
30’ 導電層に覆われていない多孔質リチウム酸化物ナノ粒子
32 導電層
34 孔
36 導電性繊維
40 導電層
50 ナノ結晶
100 柱形リチウム二次電池
102 イオン伝導層
104 正極
106 負極
108 ハウジング
110 正極端子
112 負極端子
200 コイン形リチウム二次電池
202 イオン伝導層
204 正極
206 正極ケース
208 負極
210 負極ケース
250 ガスケット
Claims (13)
- リチウム電池に用いる正極材料であって、
隣接するナノ結晶の粒界に第1の導電層を有する、ナノ結晶から形成された複数の多孔質リチウム酸化物ナノ粒子と、
前記リチウム酸化物ナノ粒子が連結することによって形成される孔と、
少なくとも前記リチウム酸化物ナノ粒子のうちの1つの表面を覆い、前記第1の導電層と接触して前記リチウム酸化物ナノ粒子の間に三次元導電ネットワークを形成する第2の導電層と、
前記第2の導電層と連結する導電性繊維と、
を含んだ多孔質リチウム酸化物マイクロ粒子を含む正極材料。 - 前記多孔質リチウム酸化物マイクロ粒子の平均粒径が5〜20マイクロメートルである請求項1に記載の正極材料。
- 前記多孔質リチウム酸化物ナノ粒子の平均粒径が100〜500ナノメートルである請求項1または2に記載の正極材料。
- 前記多孔質リチウム酸化物マイクロ粒子が0.02〜0.12c.c./gの空隙率で形成される請求項1〜3のいずれかに記載の正極材料。
- 前記多孔質リチウム酸化物ナノ粒子が層状構造、スピネル型構造、またはオリビン型構造で形成される請求項1〜4のいずれかに記載の正極材料。
- 前記多孔質リチウム酸化物ナノ粒子がLiCoxNiyMnzO2(ただしx+y+z=1である。)を含む層状構造で形成される請求項5に記載の正極材料。
- 前記多孔質リチウム酸化物ナノ粒子がLiMn2O4 を含むスピネル型構造で形成される請求項5に記載の正極材料。
- 前記多孔質リチウム酸化物ナノ粒子がLiFePO4/C、LiFePO4、またはLixM1−(d+t+q+r)DdTtQqRr(XO4)(ただし、MはFe、Mn、Co、Ti、Niおよびこれらの混合物からなる群より選ばれたものであり、DはMg2+、Ni2+、Co2+、Zn2+、Cu2+およびTi2+からなる群より選ばれたものであり、TはAl3+、Ti3+、Cr3+、Fe3+、Mn3+、Ga3+、Zn3+およびV3+からなる群より選ばれたものであり、QはTi4+、Ge4+、Sn4+およびV4+からなる群より選ばれたものであり、RはV5+、Nb5+およびTa5+からなる群より選ばれたものであり、XはSi、S、P、Vおよびこれらの混合物からなる群より選ばれたものであり、かつ、0≦x≦1、0≦d、t、q、r≦1であり、d、t、qおよびrのうちの少なくとも1つが0ではない値である。)を含むオリビン型構造で形成される請求項5に記載の正極材料。
- 前記導電層が金属、導電性有機材料または導電性無機材料を含む請求項1〜8のいずれかに記載の正極材料。
- 前記第1の導電層が約3〜10ナノメートルの厚さで形成される請求項1〜9のいずれかに記載の正極材料。
- 前記孔が規則正しいまたは不規則な形態に形成された開放孔(open pore)である請求項1〜10のいずれかに記載の正極材料。
- 前記孔が約10〜30ナノメートルのサイズで形成される請求項1〜11のいずれかに記載の正極材料。
- 請求項1〜12のいずれかに記載の前記正極材料を含む正極、
負極、および
前記正極と前記負極とに挟まれたイオン伝導層、
を含むリチウム二次電池。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW096150514 | 2007-12-27 | ||
TW096150514A TWI369019B (en) | 2007-12-27 | 2007-12-27 | Cathodal materials for lithium cells, methods for fabricating the same, and lithium secondary cells using the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2009158489A JP2009158489A (ja) | 2009-07-16 |
JP5072110B2 true JP5072110B2 (ja) | 2012-11-14 |
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Application Number | Title | Priority Date | Filing Date |
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JP2008334866A Active JP5072110B2 (ja) | 2007-12-27 | 2008-12-26 | リチウム電池に用いる正極材料 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8986890B2 (ja) |
EP (1) | EP2075864B1 (ja) |
JP (1) | JP5072110B2 (ja) |
KR (1) | KR101077899B1 (ja) |
CA (1) | CA2644302C (ja) |
TW (1) | TWI369019B (ja) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2011027682A1 (ja) * | 2009-09-03 | 2011-03-10 | 株式会社 村田製作所 | 二次電池用電極活物質の製造方法と二次電池用電極活物質の前駆体 |
BR112012011104A2 (pt) * | 2009-11-10 | 2019-09-24 | Rockwood Italia S P A | processo hidrotermico para a produção de pó de life e po4 |
KR101452228B1 (ko) * | 2010-01-07 | 2014-10-21 | 주식회사 엘지화학 | 4v 영역과 3v 영역에서 우수한 충방전 특성을 발휘할 수 있는 리튬 망간 산화물을 포함하는 양극 활물질 |
EP2355214B1 (fr) * | 2010-01-28 | 2013-12-25 | Prayon | Accumulateurs au lithium à base de phosphate de fer lithié et de carbone |
KR101392816B1 (ko) | 2010-04-21 | 2014-05-08 | 주식회사 엘지화학 | 이차전지용 양극 활물질 및 이를 포함하는 리튬 이차전지 |
DE102010021804A1 (de) * | 2010-05-27 | 2011-12-01 | Süd-Chemie AG | Verbundmaterial enthaltend ein gemischtes Lithium-Metallphosphat |
US9023526B2 (en) * | 2010-06-13 | 2015-05-05 | Samsung Sdi Co., Ltd. | Positive active material for rechargeable lithium battery, method of preparing the same, and rechargeable lithium battery including the same |
SG187660A1 (en) * | 2010-08-20 | 2013-03-28 | Univ Singapore | Mesoporous metal phosphate materials for energy storage application |
JP2012054077A (ja) * | 2010-08-31 | 2012-03-15 | Gs Yuasa Corp | 二次電池用活物質及び二次電池用活物質の製造方法、並びに、それを用いた二次電池 |
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US8986890B2 (en) | 2015-03-24 |
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