JPS62256363A - Manufacture of lithium cell - Google Patents
Manufacture of lithium cellInfo
- Publication number
- JPS62256363A JPS62256363A JP61101851A JP10185186A JPS62256363A JP S62256363 A JPS62256363 A JP S62256363A JP 61101851 A JP61101851 A JP 61101851A JP 10185186 A JP10185186 A JP 10185186A JP S62256363 A JPS62256363 A JP S62256363A
- Authority
- JP
- Japan
- Prior art keywords
- electrolyte
- positive electrode
- solvent
- electrode active
- lithium
- 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.)
- Pending
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000003792 electrolyte Substances 0.000 claims abstract description 58
- 239000002904 solvent Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000007774 positive electrode material Substances 0.000 claims description 18
- 239000008151 electrolyte solution Substances 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 8
- CFJRPNFOLVDFMJ-UHFFFAOYSA-N titanium disulfide Chemical compound S=[Ti]=S CFJRPNFOLVDFMJ-UHFFFAOYSA-N 0.000 abstract description 7
- 230000010287 polarization Effects 0.000 abstract description 5
- 229910000733 Li alloy Inorganic materials 0.000 abstract description 4
- 239000001989 lithium alloy Substances 0.000 abstract description 4
- 238000009736 wetting Methods 0.000 abstract description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 abstract description 3
- 239000005486 organic electrolyte Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000003960 organic solvent Substances 0.000 abstract description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 abstract description 2
- 239000013543 active substance Substances 0.000 abstract 3
- 230000000052 comparative effect Effects 0.000 description 5
- -1 for example Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 4
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000009849 vacuum degassing Methods 0.000 description 3
- SBUOHGKIOVRDKY-UHFFFAOYSA-N 4-methyl-1,3-dioxolane Chemical compound CC1COCO1 SBUOHGKIOVRDKY-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- TVWWSIKTCILRBF-UHFFFAOYSA-N molybdenum trisulfide Chemical compound S=[Mo](=S)=S TVWWSIKTCILRBF-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- CGPYALSRRQEZLW-UHFFFAOYSA-N [Ni](=S)(=S)=S Chemical compound [Ni](=S)(=S)=S CGPYALSRRQEZLW-UHFFFAOYSA-N 0.000 description 1
- WCQOLGZNMNEYDX-UHFFFAOYSA-N bis(selanylidene)vanadium Chemical compound [Se]=[V]=[Se] WCQOLGZNMNEYDX-UHFFFAOYSA-N 0.000 description 1
- VRSMQRZDMZDXAU-UHFFFAOYSA-N bis(sulfanylidene)niobium Chemical compound S=[Nb]=S VRSMQRZDMZDXAU-UHFFFAOYSA-N 0.000 description 1
- WVMYSOZCZHQCSG-UHFFFAOYSA-N bis(sulfanylidene)zirconium Chemical compound S=[Zr]=S WVMYSOZCZHQCSG-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- LHJOPRPDWDXEIY-UHFFFAOYSA-N indium lithium Chemical compound [Li].[In] LHJOPRPDWDXEIY-UHFFFAOYSA-N 0.000 description 1
- JWZCKIBZGMIRSW-UHFFFAOYSA-N lead lithium Chemical compound [Li].[Pb] JWZCKIBZGMIRSW-UHFFFAOYSA-N 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- KUJOABUXCGVGIY-UHFFFAOYSA-N lithium zinc Chemical compound [Li].[Zn] KUJOABUXCGVGIY-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 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
- H01M4/06—Electrodes for primary cells
- H01M4/08—Processes of manufacture
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はリチウム電池の製造方法に係り、さらに詳しく
はその正極の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a lithium battery, and more particularly to improvement of a positive electrode thereof.
従来、リチウム電池の正極は、正極活物質粉末を加圧成
形することによって作製されていた（例えば、Ｊ、 Ｅ
ｌｅｃｔｒｏｃｈｅｗ、 Ｓｏｃ、＋１３１ （６）
＋ １３４３ （１９８４） ） 。Conventionally, the positive electrode of a lithium battery has been produced by pressure molding a positive electrode active material powder (for example, J, E
electrochew, Soc, +131 (6)
+1343 (1984)).
ところが、上記のように正極活物質粉末を加圧成形する
ことによって作製された正極は、正極内部の粒子と粒子
との隙間に気泡が存在するため、電解液が浸透できない
部分があった。However, in the positive electrode produced by pressure-molding the positive electrode active material powder as described above, there were parts where the electrolytic solution could not penetrate due to the presence of air bubbles in the gaps between the particles inside the positive electrode.
そのため、正極と電解液との接触面積が小さくなって、
電流密度が高くなり、分極が大きくなって、正極の利用
率が低下するという問題があった。Therefore, the contact area between the positive electrode and the electrolyte becomes smaller,
There was a problem in that the current density increased, polarization increased, and the utilization rate of the positive electrode decreased.
本発明は、正極活物質粉末をあらかじめ電解液または電
解液溶媒で湿らせておいてから加圧成形して、加圧成形
体中に気泡が存在しな（なるようにするか、または正極
活物質粉末を加圧成形したのち、電解液または電解液溶
媒中で減圧脱気処理することにより、加圧成形体中に気
泡が存在しなくなるようにして、電解液と正極との接触
面積を大きくし、電流密度を低くし、分極を小さくして
、正極の利用率を向上させたものである。In the present invention, the positive electrode active material powder is pre-moistened with an electrolyte or an electrolyte solvent and then pressure-molded so that no air bubbles are present in the press-molded product, or the positive electrode active material powder is After the material powder is pressure-molded, it is degassed under reduced pressure in an electrolyte or an electrolyte solvent to eliminate air bubbles in the press-molded product and increase the contact area between the electrolyte and the positive electrode. However, the current density is lowered, polarization is reduced, and the utilization rate of the positive electrode is improved.
本発明において、正極活物質粉末を湿らすための湿潤処
理または正極活物質を加圧成形したのちの成形体の減圧
脱気処理を、電解液または電解液溶媒で行うのは、従来
の加圧成形体中に存在していた気泡を電解液または電解
液溶媒で置換するためであり、そうすることによって加
圧成形体をそのまま正極として電池組立に供することが
できるからである。In the present invention, the wetting treatment for moistening the positive electrode active material powder or the vacuum degassing treatment of the molded body after pressure molding the positive electrode active material using an electrolyte or an electrolyte solvent is different from conventional pressurization. This is to replace the air bubbles present in the molded body with the electrolytic solution or electrolyte solvent, and by doing so, the press-molded body can be used as a positive electrode for battery assembly.
本発明において、正極活物質としては、例えば二硫化チ
タン（ＴｉＳ２）、二硫化モリブデン（ＭｏＳ２）、三
硫化モリブデン（ＭｏＳ３）、硫化ジルコニウム（Ｚｒ
Ｓ２）、二硫化ニオブ（Ｎｂｓ２）、三硫化リンニッケ
ル（ＮｉＰＳ３）、バナジウムセレナイド（ＶＳｅｚ）
、五酸化バナジウム（Ｖ２Ｏ３）、十三酸化バナジウム
（Ｖ６Ｏ１３）、リチウムコバルト酸化物（ＬｉＣｏ０
２）などが用いられる。また、負極にはリチウムまたは
リチウム合金が用いられる。リチウム合金としては、例
えばりチウム−アルミニウム、リチウム−鉛、リチウム
−インジウム、リチウム−ガリウム−インジウム、リチ
ウム−マグネシウム、リチウム−亜鉛などのリチウム合
金が用いられる。In the present invention, examples of positive electrode active materials include titanium disulfide (TiS2), molybdenum disulfide (MoS2), molybdenum trisulfide (MoS3), and zirconium sulfide (Zr).
S2), niobium disulfide (Nbs2), phosphorous nickel trisulfide (NiPS3), vanadium selenide (VSez)
, vanadium pentoxide (V2O3), vanadium dexaoxide (V6O13), lithium cobalt oxide (LiCo0
2) etc. are used. Furthermore, lithium or a lithium alloy is used for the negative electrode. As the lithium alloy, for example, lithium alloys such as lithium-aluminum, lithium-lead, lithium-indium, lithium-gallium-indium, lithium-magnesium, and lithium-zinc are used.
そして、電解液には、例えばプロピレンカーボネート、
Ｔ−ブチロラクトン、テトラヒドロフラン、１．２−ジ
メトキシエタン、１．２−ジェトキシエタン、１．３−
ジオキソラン、４−メチル−１，３−ジオキソランなど
の有機溶媒の単独もしくは２種以上の混合溶媒を電解液
溶媒とし、これに例えばＬｉＣｌＯ４、ＬｉＰＦ６、ｌ
、１ＡｓＦ６、Ｌｉ５ｂＦ６、ｌ、１ＢＦ４、ＬｉＢ（
Ｃ６Ｈ５）４などの電解質の１種または２種以上を溶解
した有機電解液が用いられる。また、ｌ、１ＰＦＢなど
の電解質の熱安定性を高めるために、ヘキサメチルホス
ホリックトリアミドなどの安定化剤を添加することも好
ましく採用される。The electrolyte contains, for example, propylene carbonate,
T-butyrolactone, tetrahydrofuran, 1.2-dimethoxyethane, 1.2-jethoxyethane, 1.3-
A single or mixed solvent of two or more organic solvents such as dioxolane and 4-methyl-1,3-dioxolane is used as the electrolyte solvent, and for example, LiClO4, LiPF6, l
, 1AsF6, Li5bF6, l, 1BF4, LiB(
An organic electrolytic solution in which one or more types of electrolytes such as C6H5)4 are dissolved is used. Furthermore, in order to enhance the thermal stability of electrolytes such as 1 and 1PFB, it is also preferably employed to add a stabilizer such as hexamethylphosphoric triamide.
本発明の実施にあたり、正極活物質粉末を電解液または
電解液溶媒で湿らすが、この湿潤処理は、正極活物質粉
末を電解液または電解液溶媒に浸漬するか、あるいは正
極活物質粉末に電解液または電解液溶媒を散布すること
によって行われる。In carrying out the present invention, the positive electrode active material powder is wetted with an electrolytic solution or an electrolytic solution solvent, and this wetting treatment is performed by immersing the positive electrode active material powder in the electrolytic solution or an electrolytic solution solvent, or by electrolyzing the positive electrode active material powder into an electrolyte. This is done by spraying a liquid or electrolyte solvent.
そして、そのように正極活物質粉末を電解液または電解
液溶媒で湿らせて加圧成形することによって、加圧成形
体中の粒子間の隙間は電解液または電解液溶媒で占めら
れて気泡が存在しなくなる。By wetting the positive electrode active material powder with an electrolyte or electrolyte solvent and press-molding it, the gaps between the particles in the press-molded body are occupied by the electrolyte or electrolyte solvent, and air bubbles are eliminated. cease to exist.
また、正極活物質粉末の加圧成形体を電解液または電解
液溶媒中で減圧脱気すると、加圧成形体中の粒子間の隙
間に存在していた気泡は電解液または電解液溶媒で置換
され、加圧成形体中の粒子間の隙間には気泡が存在しな
（なり、正極と電解液とが広い面積で接触するようにな
る。なお、正極活物質粉末を電解液または電解液溶媒で
湿らす程度は、正極活物質粉末の表面が電解液または電
解液溶媒で覆われ、しっとりと湿っている程度にするの
がよく、電解液や電解液溶媒が多すぎてスラリー状態に
なると、加圧成形にあたって金型に充填する際に取り扱
いに（（なる。In addition, when a press-molded body of positive electrode active material powder is degassed under reduced pressure in an electrolyte or an electrolyte solvent, the air bubbles existing in the gaps between particles in the press-molded body are replaced by the electrolyte or electrolyte solvent. As a result, there are no air bubbles in the gaps between particles in the press-molded body, and the positive electrode and electrolyte come into contact over a wide area. It is best to moisten the powder to the extent that the surface of the positive electrode active material powder is covered with the electrolyte or electrolyte solvent and is moist. If there is too much electrolyte or electrolyte solvent and it becomes a slurry, It becomes difficult to handle when filling the mold during pressure molding.
そして、使用する正極活物質の種類によって黒鉛などの
導電助剤を必要とする場合には、正極活物質と導電助剤
とが共存した状態で電解液または電解液溶媒で湿潤処理
すればよいし、また加圧成形後、電解液または電解液溶
媒中で減圧脱気処理をすればよい、また、結着剤を要す
る場合も、結着剤を正極活物質などと共存した状態で加
圧成形し、得られた加圧成形体を電解液または電解液溶
媒中で減圧脱気処理をすればよい。If a conductive agent such as graphite is required depending on the type of positive electrode active material used, it is sufficient to perform a wet treatment with an electrolyte or an electrolyte solvent while the positive electrode active material and conductive agent coexist. In addition, after pressure molding, degassing under reduced pressure may be performed in the electrolyte solution or electrolyte solvent.Also, if a binder is required, pressure molding is performed with the binder coexisting with the positive electrode active material, etc. Then, the obtained press-molded body may be subjected to a vacuum degassing treatment in an electrolytic solution or an electrolytic solution solvent.
つぎに実施例をあげて本発明をさらに詳細に説明する。 Next, the present invention will be explained in more detail by giving examples.
実施例１
平均粒径約７μ−の二硫化チタン粉末を下記に示す電解
液に浸漬し、引き上げた後、湿潤状態で１３ｍＡｈ相当
量秤取して金型に充填し、１００ｋｇ／ｄの圧力で加圧
成形して直？１７．０ｍｍ、 １）さ約０．５−鵬の加
圧成形体を作製した。電解液は４−メチル−１，３−ジ
オキソランと１．２−ジメトキシエタンとヘキサメチル
ホスホリックトリアミドの容量比６０：３５：５の混合
溶媒にＬｉＦ２を１ｍｏｌ／ｌｔの割合で溶解した有機
電解液である。Example 1 Titanium disulfide powder with an average particle size of about 7μ was immersed in the electrolytic solution shown below, pulled up, weighed out in a wet state in an amount equivalent to 13mAh, filled into a mold, and heated at a pressure of 100kg/d. Directly after pressure molding? A pressure-molded body having a diameter of 17.0 mm and a diameter of approximately 0.5 mm was prepared. The electrolyte was an organic electrolyte in which LiF2 was dissolved at a ratio of 1 mol/lt in a mixed solvent of 4-methyl-1,3-dioxolane, 1,2-dimethoxyethane, and hexamethylphosphoric triamide in a volume ratio of 60:35:5. It is a liquid.
上記のようにして作製した加圧成形体を正極として用い
、負極にはリチウムを用い、電解液には上記と同組成の
有機電解液を用い、常法に準じて電池組立を行い、第１
図に示す構造のリチウム電池を製造した。Using the pressure-molded body produced as described above as a positive electrode, lithium as a negative electrode, and an organic electrolyte having the same composition as above as an electrolyte, a battery was assembled according to a conventional method.
A lithium battery with the structure shown in the figure was manufactured.
第１図において、１は負極で、上述のようにすチウムか
らなり、この負極１のリチウムの電気量は正極の二硫化
チタンの電気量より多（されている、２は前述のように
して作製された正極である、３は微孔性ポリプロピレン
フィルムからなるセパレータ、４はポリプロピレン不織
布からなる電解液吸収体であり、前述の電解液は主とし
てこの電解液吸収体４とセパレータ３に吸蔵され、一部
は正極２内に含浸されている。５はポリプロピレン製の
環状ガスケットで、６はステンレス鋼製で外面にニッケ
ルメッキを施した負極缶、７はステンレス鋼製で外面に
ニッケルメッキを施した正極缶で、８はステンレス鋼製
網からなる負極側の集電体である。In FIG. 1, 1 is a negative electrode, which is made of lithium as mentioned above, and the amount of electricity of lithium in this negative electrode 1 is greater than the amount of electricity of titanium disulfide in the positive electrode. In the produced positive electrode, 3 is a separator made of a microporous polypropylene film, 4 is an electrolyte absorber made of a polypropylene nonwoven fabric, and the above-mentioned electrolyte is mainly occluded in the electrolyte absorber 4 and the separator 3, A portion is impregnated into the positive electrode 2. 5 is an annular gasket made of polypropylene, 6 is a negative electrode can made of stainless steel with nickel plating on the outside, and 7 is made of stainless steel with nickel plating on the outside. In the positive electrode can, 8 is a current collector on the negative electrode side made of a stainless steel mesh.
実施例２
平均粒径約７μｍの二硫化チタン粉末を１３ｍＡｈ相当
量金型に充填し、１００ｋｇ／−の圧力で加圧成形し、
直径７．０−一、厚さ約０．５−一の加圧成形体を作製
した。上記加圧成形体をコック付きの容器に入れ、実施
例１と同様の電解液を注入して、加圧成形体が電解液中
に浸漬した状態にし、オイルレスロータリーポンプで約
ＩＱ＋ｗ＋ｓＨｇに減圧し、コックを閉じて５分間放置
した。この操作を３回繰り返した後、加圧成形体を容器
中から取り出し、それを正極として用いたほかは実施例
１と同様にしてリチウム電池を製造した。なお、上記の
ように減圧状態でコックを閉じて５分間放置したのは、
吸引を続けると電解液が揮発して電解液の損失が多くな
るので、この放置期間中に加圧成形体中の気体をぬき出
して容器内に満たしておき、それを吸引することによっ
て、できるだけ選択的に加圧成形体中から気体を脱気す
るためである。Example 2 Titanium disulfide powder with an average particle size of about 7 μm was filled into a mold in an amount equivalent to 13 mAh, and pressure molded at a pressure of 100 kg/-.
A pressure-molded body having a diameter of 7.0 mm and a thickness of about 0.5 mm was produced. The press-molded body was placed in a container with a stopcock, and the same electrolyte as in Example 1 was poured into it, so that the press-molded body was immersed in the electrolyte, and the pressure was reduced to approximately IQ+w+sHg using an oilless rotary pump. , the stopcock was closed and left for 5 minutes. After repeating this operation three times, the press-molded body was taken out from the container and a lithium battery was produced in the same manner as in Example 1, except that it was used as a positive electrode. In addition, as mentioned above, closing the cock and leaving it for 5 minutes in a reduced pressure state
If the suction is continued, the electrolyte will volatilize and the loss of the electrolyte will increase. Therefore, during this standing period, the gas in the press-molded body is drawn out and filled in the container, and by suctioning it, the electrolyte is removed as much as possible. This is to selectively remove gas from the press-molded body.
比較例１
平均粒径約７μｍの二硫化チタン粉末を、実施例１のよ
うに電解液で湿らすことなく、そのまま１３ｍＡｈ相当
量金型に充填し、１００ｋｇ／ａｊの圧力で加圧成形し
て直径１．０ｍｍ、厚さ約０．５＋ｕ＋の加圧成形体を
作製した。この加圧成形体を、実施例２のような電解液
中での減圧脱気処理することなく、そのまま正極として
電池組立に供し、それ以外は実施例１と同様にしてリチ
ウム電池を製造した。Comparative Example 1 Titanium disulfide powder with an average particle size of about 7 μm was filled into a mold in an amount equivalent to 13 mAh without being moistened with an electrolytic solution as in Example 1, and then pressure-molded at a pressure of 100 kg/aj. A pressure-molded body having a diameter of 1.0 mm and a thickness of approximately 0.5+u+ was produced. This press-molded body was used as a positive electrode for battery assembly without being subjected to vacuum degassing in an electrolytic solution as in Example 2, and a lithium battery was manufactured in the same manner as in Example 1 except for this.
上記のようにして得られた実施例１〜２の電池および比
較例１の電池を２５℃、放電電流０・７６ｍＡ（正極の
みかけ表面積あたり２ｍＡ／ａｌｌ）で放電した。その
結果を第２図に示す。The batteries of Examples 1 and 2 and the battery of Comparative Example 1 obtained as described above were discharged at 25° C. at a discharge current of 0.76 mA (2 mA/all per apparent surface area of the positive electrode). The results are shown in FIG.
第２図に示すように、実施例１〜２の電池は、比較例１
の電池に比べて、同じ放電容量で見た場合の電池電圧の
低下、つまり分極が小さかった。As shown in FIG. 2, the batteries of Examples 1 and 2 are
Compared to other batteries, the drop in battery voltage, or polarization, was smaller when looking at the same discharge capacity.
そのため、終止電圧を１．５ｖで設定した時の放電容量
は、実施例１の電池で８．５ｍＡｈ、実施例２の電池で
８．９ｍＡｈで、比較例１の電池で６．６ｍＡｈであり
、実施例１〜２では比較例１に比べて大きな放電容量が
得られた。これは実施例１〜２では前述したように分極
が小さいため、正極の利用率が向上した結果によるもの
と考えられる。Therefore, the discharge capacity when the final voltage was set at 1.5 V was 8.5 mAh for the battery of Example 1, 8.9 mAh for the battery of Example 2, and 6.6 mAh for the battery of Comparative Example 1. In Examples 1 and 2, a larger discharge capacity was obtained than in Comparative Example 1. This is considered to be due to the fact that in Examples 1 and 2, the polarization was small as described above, so the utilization rate of the positive electrode was improved.
第１図は本発明に係るリチウム電池の一例を示す断面図
であり、第２図は実施例１〜２の電池と比較例１の電池
の放電特性を示す図である。
ｌ・・・負極、 ２・・・正極、 ３・・・セパレータ
、４・・・電解液吸収体
第 １ 図
第 ２ 図
放電容量（ｍＡｈ）FIG. 1 is a sectional view showing an example of a lithium battery according to the present invention, and FIG. 2 is a diagram showing the discharge characteristics of the batteries of Examples 1 and 2 and the battery of Comparative Example 1. 1... Negative electrode, 2... Positive electrode, 3... Separator, 4... Electrolyte absorber Figure 1 Figure 2 Discharge capacity (mAh)
Claims (1)
せて加圧成形するか、または正極活物質粉末を加圧成形
したのち、電解液または電解液溶媒中に浸漬して減圧脱
気することを特徴とするリチウム電池の製造方法。(1) Wet the positive electrode active material powder with an electrolytic solution or an electrolytic solution solvent and pressure mold it, or after pressure molding the positive electrode active material powder, immerse it in the electrolytic solution or electrolyte solvent and degas it under reduced pressure. A method for manufacturing a lithium battery, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61101851A JPS62256363A (en) | 1986-04-30 | 1986-04-30 | Manufacture of lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61101851A JPS62256363A (en) | 1986-04-30 | 1986-04-30 | Manufacture of lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62256363A true JPS62256363A (en) | 1987-11-09 |
Family
ID=14311546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61101851A Pending JPS62256363A (en) | 1986-04-30 | 1986-04-30 | Manufacture of lithium cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62256363A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03201360A (en) * | 1989-12-27 | 1991-09-03 | Fuji Elelctrochem Co Ltd | Manufacture of positive electrode mixture for manganese dry cell |
-
1986
- 1986-04-30 JP JP61101851A patent/JPS62256363A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03201360A (en) * | 1989-12-27 | 1991-09-03 | Fuji Elelctrochem Co Ltd | Manufacture of positive electrode mixture for manganese dry cell |
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