JPH09161807A - Electrode base for lithium ion battery - Google Patents
Electrode base for lithium ion batteryInfo
- Publication number
- JPH09161807A JPH09161807A JP7348498A JP34849895A JPH09161807A JP H09161807 A JPH09161807 A JP H09161807A JP 7348498 A JP7348498 A JP 7348498A JP 34849895 A JP34849895 A JP 34849895A JP H09161807 A JPH09161807 A JP H09161807A
- Authority
- JP
- Japan
- Prior art keywords
- ion battery
- lithium ion
- electrode base
- sintered
- strength
- 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
Classifications
-
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、リチウムイオン電池の
電極基体に関するものである。FIELD OF THE INVENTION The present invention relates to an electrode substrate for a lithium ion battery.
【０００２】[0002]
【従来の技術】リチウムイオン電池の正極、陰極基体に
は通常金属箔が用られている。正極にあってはＡＬ、あ
るいはＴｉ箔に陽極活物質が塗布され、陰極にあって
は、Ｃｕ，Ｎｉ箔に炭素粉が塗布されている。 従来技術の問題点 箔を使用するために活物質の充填度が劣る。 裏表面でＬｉイオンの行き来ができない。 充墳度を上げるために、粉末多孔体あるいはメッキによ
る多孔体を使用する試みもあるが、骨格内部に活物質を
充填できない空間（死空間）の問題、あるいは強度が弱
い問題がある。2. Description of the Related Art Metal foils are usually used for the positive electrode and negative electrode substrates of lithium ion batteries. For the positive electrode, the AL or Ti foil is coated with the positive electrode active material, and for the cathode, the Cu or Ni foil is coated with the carbon powder. Problems of the prior art Since the foil is used, the filling degree of the active material is poor. Li ions cannot pass back and forth on the back surface. Attempts have been made to use a powdered porous body or a plated porous body in order to increase the filling degree, but there is a problem of a space (dead space) where the active material cannot be filled in the skeleton, or a problem of weak strength.
【０００３】[0003]
【発明が解決する課題】本発明は、かかる問題に鑑みて
なされたもので、その目的とするところは、活物質の充
填度が高く、強度も高い電極基体を提供せんとするもの
である。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an electrode substrate having a high filling degree of an active material and a high strength.
【０００４】[0004]
【課題を解決するための手段】本発明者は鋭意研究を行
った結果、次の知見を得た。すなわち、金属繊維の不
織布は気孔率が高く、しかも死空間が極めて少ないこ
と、そして金属不織布の繊維の交差部を焼結すると電
気導電性と強度に優れたものが得られ、さらに繊維の
直径は１０〜８０ミクロンの範囲が、長さは，１０〜１
００ｍｍの範囲が好ましいことを見いだした。本発明は
以上の知見によってなされたもので次の構成からなる。 １． 繊維の交差部分が焼結された構造の金属繊維不織
布で形成されてなることを特徴とするリチウムイオン電
池の電極基体。 ２． 上記金属繊維の直径が１０〜８０ミクロン，長さ
が１０〜１００ｍｍである１に記載のリチウムイオン電
池の電極基体。 ３． 上記金属基体の厚さが０．１〜３ｍｍである１あ
るいは２に記載のリチウムイオン電池の電極基体。Means for Solving the Problems As a result of intensive studies, the present inventors have obtained the following findings. That is, the non-woven fabric of metal fibers has a high porosity and extremely few dead spaces, and by sintering the intersections of the fibers of the metal non-woven fabric, excellent electrical conductivity and strength can be obtained. The range is 10 to 80 microns and the length is 10 to 1
We have found that a range of 00 mm is preferred. The present invention has been made based on the above findings and has the following configuration. 1. An electrode substrate for a lithium-ion battery, which is formed of a metal fiber nonwoven fabric having a structure in which intersecting portions of fibers are sintered. 2. 2. The electrode substrate for a lithium ion battery according to 1, wherein the metal fiber has a diameter of 10 to 80 microns and a length of 10 to 100 mm. 3. 3. The electrode base for a lithium ion battery according to 1 or 2, wherein the metal base has a thickness of 0.1 to 3 mm.
【０００５】[0005]
【発明の実施の形態】金属不織布の繊維の交差部を焼結
させることによって電気導電性と強度に優れた不織布が
得られることは本発明者等がすでに発明、出願してい
る。この不織布は平面上に一様に散布した金属繊維を加
圧しながら焼結してその交差部分を焼結するものであ
る。この方法によるとほぼ繊維の線径に近いものから任
意の厚さのものが自在に得られる。強度は繊維の集積密
度によって異なるが、同じ集積度で比較すると非焼結の
不織布の数百倍の引っ張り強度が得られる。陽極基体に
使用するアルミニウム繊維不織布の交差部を焼結したも
ので、５〜２０ｋｇ／ｃｍ２の引っ張り強度、Ｔｉ繊維
不織布の交差部を焼結したもので、６０〜８０ｋｇ／ｃ
ｍ２の引っ張り強度が得られ、電池の電極基板の強度と
して評価した場合、１．５ｍｍ厚さ、２０ｍｍ幅で、Ａ
Ｌで最高３〜８ｋｇの強度、Ｔｉで最高１５〜２８ｋｇ
の強度が得られ、リチウムイオン電池の陽極基板の強度
としては十分である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present inventors have already invented and filed that a nonwoven fabric having excellent electrical conductivity and strength can be obtained by sintering the intersection of fibers of a metal nonwoven fabric. This non-woven fabric is obtained by sintering metal fibers uniformly spread on a flat surface while applying pressure, and sintering the intersection. According to this method, a material having an arbitrary thickness from a material having a diameter substantially close to the fiber diameter can be freely obtained. Although the strength differs depending on the fiber accumulation density, a tensile strength several hundred times higher than that of a non-sintered nonwoven fabric can be obtained when compared at the same degree of accumulation. Aluminum fiber non-woven fabric used for the anode base is a sintered cross-section, tensile strength of 5 to 20 kg / cm 2 , Ti fiber non-woven fabric cross-section is sintered, 60 to 80 kg / c
A tensile strength of m 2 was obtained, and when evaluated as the strength of the electrode substrate of the battery, it was 1.5 mm thick and 20 mm wide, and A
Maximum strength of 3-8kg for L, maximum of 15-28kg for Ti
Is obtained, which is sufficient as the strength of the anode substrate of the lithium ion battery.
【０００６】陰極基体に使用するＣｕ繊維不織布の交差
部を焼結したもので、２０〜５０ｋｇ／ｃｍ２の引っ張
り強度が、Ｎｉ繊維不織布の交差部を焼結したもので、
３０〜６０ｋｇ／ｃｍ２の引っ張り強度が得られ、電池
の電極基板の強度として評価した場合、１．５ｍｍ厚
さ、２０ｍｍ幅で、Ｃｕで最高１０〜１８ｋｇの強度、
Ｎｉで最高９〜１８ｋｇの強度が得られ、リチウムイオ
ン電池の陰極基板の強度としては十分である。The intersection of the Cu fiber non-woven fabric used for the cathode substrate is sintered, and the tensile strength of 20 to 50 kg / cm 2 is obtained by sintering the intersection of the Ni fiber non-woven fabric.
A tensile strength of 30 to 60 kg / cm 2 was obtained, and when evaluated as the strength of the electrode substrate of the battery, the strength was 1.5 mm, the width was 20 mm, and the Cu was a maximum of 10 to 18 kg.
With Ni, a maximum strength of 9 to 18 kg is obtained, which is sufficient as the strength of the cathode substrate of a lithium ion battery.
【０００７】使用する金属繊維の線径は１０〜８０ミク
ロン，長さが１０〜１００ｍｍの範囲のものが最も好ま
しい。金属繊維の焼結は、還元、非酸化性雰囲気で０．
５ｇ／ｃｍ２以上の圧力で加圧しながら焼結するのが望
ましく、焼結温度は、ＡＬでは４００〜６５０℃の範
囲、Ｔｉでは１０００〜１３００℃の範囲、Ｃｕでは６
００〜９００℃の範囲、Ｎｉでは９００〜１１５０℃の
範囲で焼結するのが好ましい。Most preferably, the metal fiber used has a wire diameter of 10 to 80 microns and a length of 10 to 100 mm. Sintering of metal fibers can be performed in a reducing, non-oxidizing atmosphere at 0.
It is desirable to sinter while pressurizing at a pressure of 5 g / cm 2 or more, and the sintering temperature is 400 to 650 ° C. for AL, 1000 to 1300 ° C. for Ti, and 6 for Cu.
It is preferable to sinter in the range of 00 to 900 ° C., and in the case of Ni in the range of 900 to 1150 ° C.
【０００８】金属繊維の成分は、上記したように陽極で
はＡＬ，ＴｉあるいはＡＬ，Ｔｉを主成分にする合金
が、陰極では、Ｃｕ，Ｎｉ、あるいはＣｕ，Ｎｉを主成
分にする合金を適宜選択できる。上記主成分以外の合金
成分は、陽極、陰極とも本来の耐蝕性が損なわれない範
囲であれば適宜てんかしてよい。As described above, the metal fiber component is appropriately selected from AL, Ti or an alloy containing AL and Ti as a main component in the anode and Cu, Ni or an alloy containing Cu, Ni as a main component in the cathode. it can. Alloying components other than the above main components may be appropriately added to the anode and cathode as long as the original corrosion resistance is not impaired.
【０００９】金属繊維の散布密度は、焼結後の気孔率に
関係し、本発明の目的のためには、ＡＬにあっては，６
０〜３００ｇ／ｍ２の範囲が，Ｔｉにあっては，１００
〜５００ｇ／ｍ２の範囲が、Ｃｕにあっては、２００〜
７００ｇ／ｍ２の範囲が、Ｎｉにあっては、２００〜７
００ｇ／ｍ２の範囲が好ましく、最も好ましくは、Ａ
Ｌ，２．０〜６．０ｇ／２２５ｃｍ２の範囲，Ｔｉ，
３．０〜８．０ｇ／２２５ｃｍ２の範囲，Ｃｕ，５．０
〜１０．０ｇ／２２５ｃｍ２の範囲、Ｎｉ，５．０〜１
０．０ｇ／２２５ｃｍ２の範囲である。下限値未満、上
限を越えると共に活物質を十分に充填できない。The distribution density of the metal fibers is related to the porosity after sintering, and for the purposes of the present invention, in AL it is 6
The range of 0 to 300 g / m 2 is 100 for Ti.
The range of ~ 500 g / m 2 is 200 ~ for Cu.
The range of 700 g / m 2 is 200 to 7 for Ni.
A range of 00 g / m 2 is preferred, most preferably A
L, the range of 2.0 to 6.0 g / 225 cm 2 , Ti,
Range of 3.0 to 8.0 g / 225 cm 2 , Cu, 5.0
~10.0g / 225cm 2 of range, Ni, 5.0~1
It is in the range of 0.0 g / 225 cm 2 . Below the lower limit and above the upper limit, the active material cannot be sufficiently filled.
【００１０】[0010]
【実施例】実施例について本発明を説明する。 実施例１ 直径５０ミクロン、長さ２５ｍｍの下記組成のＡＬ繊維
をセラミック板の上に散布密度２００ｇ／ｍ２で散布
し、これに２０ｇ／ｃｍ２の割合で加圧して、水素雰囲
気６３０℃で焼結した。 ＡＬ繊維の組成（ｗｔ％） Ｓｉ：０．２ Ｆｅ：０．２５ ｃｕ：０．０４ Ｍｎ：０．０３ Ｍｇ：０．０３ Ｚｎ：０．０４ Ｔｉ：０．０３ ＡＬ：９９．７以上 得られた不織布の引張り強度は１５ｋｇ／ｃｍ２、厚さ
は０．８ｍｍであった。多孔体の気孔率は、９２ｖｏｌ
％であった。EXAMPLES The present invention will be described with reference to examples. Example 1 An AL fiber having a diameter of 50 μm and a length of 25 mm and having the following composition was sprayed on a ceramic plate at a spraying density of 200 g / m 2 , and a pressure of 20 g / cm 2 was applied to this, and a hydrogen atmosphere at 630 ° C. Sintered. Composition of AL fiber (wt%) Si: 0.2 Fe: 0.25 cu: 0.04 Mn: 0.03 Mg: 0.03 Zn: 0.04 Ti: 0.03 AL: 99.7 or more Obtained The obtained nonwoven fabric had a tensile strength of 15 kg / cm 2 and a thickness of 0.8 mm. The porosity of the porous body is 92 vol.
%Met.
【００１１】実施例２ 直径３０ミクロン、長さ２５ｍｍの下記組成のｃｕ繊維
をセラミック板の上に散布密度４００ｇ／ｍ２で散布
し、これに２０ｇ／ｃｍ２の割合で加圧して、水素雰囲
気７８０℃で焼結した。 Ｃｕ繊維の組成（ｗｔ％） Ｃｕ： ９９．７以上 得られた不織布の引張り強度は３８ｋｇ／ｃｍ２、厚さ
は１．２ｍｍであった。多孔体の気孔率は、９４ｖｏｌ
％であった。Example 2 Cu fibers having a diameter of 30 μm and a length of 25 mm and having the following composition were sprayed on a ceramic plate at a spraying density of 400 g / m 2 , and a pressure of 20 g / cm 2 was applied to this, and a hydrogen atmosphere was applied. Sintered at 780 ° C. Composition of Cu fiber (wt%) Cu: 99.7 or more The tensile strength of the obtained non-woven fabric was 38 kg / cm 2 , and the thickness was 1.2 mm. The porosity of the porous body is 94 vol.
%Met.
【００１２】実施例３ 実施例１，２で得られたＡＬ，Ｃｕ不織布を縦４０ｍ
ｍ，横１１０ｍｍに裁断し、これを渦巻状に丸めて外径
８ｍｍのＬｉイオン電池の陽極基板、陰極基板となし、
陽極には陽極活物質のＬｉＣｏＯ２を含浸した。陰極に
は炭素紛を含浸した。含浸前後の陽極、陰極基板の重量
変化から含浸された量を計算し、含浸された材料の体積
を算出した。実施例１，２の気孔率から陽極活物質、お
よび炭素粉末の充填率を算出した。 実施例１の不織布は９７％ 実施例２の不織布は９８％であった。したがって、死空
間は、実施例１は３％，実施例２は２％であった。本発
明の不織布電極では死空間が極めて少ないことが確認で
きた。Example 3 The AL and Cu non-woven fabrics obtained in Examples 1 and 2 are 40 m in length.
m, 110 mm in width, and rolled into a spiral shape to form an anode substrate and a cathode substrate for a Li-ion battery having an outer diameter of 8 mm,
The anode was impregnated with LiCoO 2 as an anode active material. The cathode was impregnated with carbon powder. The impregnated amount was calculated from the weight change of the anode and cathode substrates before and after impregnation, and the volume of the impregnated material was calculated. The filling rate of the anode active material and the carbon powder was calculated from the porosities of Examples 1 and 2. The nonwoven fabric of Example 1 was 97% and the nonwoven fabric of Example 2 was 98%. Therefore, the dead space was 3% in Example 1 and 2% in Example 2. It was confirmed that the dead space was extremely small in the nonwoven fabric electrode of the present invention.
【００１３】[0013]
【発明の効果】以上詳記したように本発明電極は、気孔
率、強度共に高く、しかも死空間が極めて少ない特徴を
有し、しかも素材が安価であり、Ｌｉイオン電池の機能
向上と製造コストの低減に多大の貢献をなすものであ
る。As described in detail above, the electrode of the present invention has the features of high porosity and strength, and very few dead spaces, and the material is inexpensive, and the function and manufacturing cost of the Li-ion battery are improved. It greatly contributes to the reduction of
Claims (3)
維不織布で形成されてなることを特徴とするリチウムイ
オン電池の電極基体。1. An electrode substrate for a lithium ion battery, which is formed of a metal fiber non-woven fabric having a structure in which intersecting portions of fibers are sintered.
ン，長さが１０〜１００ｍｍである請求項１に記載のリ
チウムイオン電池の電極基体。2. The electrode substrate for a lithium ion battery according to claim 1, wherein the metal fiber has a diameter of 10 to 80 μm and a length of 10 to 100 mm.
る請求項１あるいは２に記載のリチウムイオン電池の電
極基体。3. The electrode base for a lithium ion battery according to claim 1, wherein the metal base has a thickness of 0.1 to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7348498A JPH09161807A (en) | 1995-12-06 | 1995-12-06 | Electrode base for lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7348498A JPH09161807A (en) | 1995-12-06 | 1995-12-06 | Electrode base for lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09161807A true JPH09161807A (en) | 1997-06-20 |
Family
ID=18397422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7348498A Pending JPH09161807A (en) | 1995-12-06 | 1995-12-06 | Electrode base for lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09161807A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999000001A3 (en) * | 1997-06-27 | 1999-09-30 | Lg Chemical Ltd | Lithium ion secondary battery and manufacturing method of the same |
| KR101088073B1 (en) * | 2010-10-16 | 2011-12-01 | 주식회사 샤인 | Battery having electrode structure with metal long fibers and method of fabricating the same |
-
1995
- 1995-12-06 JP JP7348498A patent/JPH09161807A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999000001A3 (en) * | 1997-06-27 | 1999-09-30 | Lg Chemical Ltd | Lithium ion secondary battery and manufacturing method of the same |
| KR101088073B1 (en) * | 2010-10-16 | 2011-12-01 | 주식회사 샤인 | Battery having electrode structure with metal long fibers and method of fabricating the same |
| JP2013543231A (en) * | 2010-10-16 | 2013-11-28 | シャイン カンパニー リミテッド | Battery having electrode structure including long metal fiber and method for manufacturing the same |
| CN103460463A (en) * | 2010-10-16 | 2013-12-18 | 株式会社阳光 | Battery having an electrode structure comprising long metal fibres and a production method therefor |
| US9680147B2 (en) | 2010-10-16 | 2017-06-13 | Jenax Inc. | Battery having an electrode structure comprising long metal fibers and a production method therefor |
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| A02 | Decision of refusal |
Effective date: 20090310 Free format text: JAPANESE INTERMEDIATE CODE: A02 |