JPH0582132A - Lithium secondary battery - Google Patents
Lithium secondary batteryInfo
- Publication number
- JPH0582132A JPH0582132A JP3270056A JP27005691A JPH0582132A JP H0582132 A JPH0582132 A JP H0582132A JP 3270056 A JP3270056 A JP 3270056A JP 27005691 A JP27005691 A JP 27005691A JP H0582132 A JPH0582132 A JP H0582132A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- battery
- positive electrode
- crystal structure
- 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.)
- 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
Landscapes
- Carbon And Carbon Compounds (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、非水溶媒系の電解質を
用いるリチウム二次電池に関するもので、詳しくはその
負極に用いる炭素質材料に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium secondary battery using a non-aqueous solvent type electrolyte, and more particularly to a carbonaceous material used for its negative electrode.
【0002】[0002]
【従来の技術】近年、負極にリチウムを利用した二次電
池が注目され、実用化に向けての技術開発が盛んであ
る。しかし、負極として金属リチウムを用いる二次電池
では、充放電サイクル寿命が短いという問題がある。こ
れは、充電時のリチウムがデンドライト状に析出するこ
とによる負極の劣化に起因する。この問題を解消するべ
く、リチウム吸蔵能力を有する炭素粉末又は炭素繊維を
負極とするリチウム二次電池が、特開昭62−2680
58号公報等で提案されている。2. Description of the Related Art In recent years, rechargeable batteries using lithium as a negative electrode have been receiving attention, and technological developments for practical use have been vigorous. However, the secondary battery using metallic lithium as the negative electrode has a problem of short charge / discharge cycle life. This is due to the deterioration of the negative electrode due to the dendrite-like deposition of lithium during charging. In order to solve this problem, a lithium secondary battery having a negative electrode of carbon powder or carbon fiber having a lithium storage capacity is disclosed in JP-A-62-2680.
No. 58, etc.
【0003】[0003]
【発明が解決しようとする課題】しかし、従来の炭素粉
末又は炭素繊維は、X線回折による格子面間隔(d00
2)が3.40〜3.60Å、a軸及びc軸方向の結晶
子の大きさ(La,Lc)が10〜250Åのものが採
用されており、これを用いた電池の初期容量及びサイク
ル寿命は、満足する性能が得られていなかった。However, in the conventional carbon powder or carbon fiber, the lattice spacing (d00) by X-ray diffraction is used.
2) is 3.40 to 3.60Å, and the crystallite size (La, Lc) in the a-axis and c-axis directions is 10 to 250Å, and the initial capacity and cycle of the battery using this are adopted. Regarding the life, satisfactory performance was not obtained.
【0004】[0004]
【課題を解決するための手段】本発明は上記問題点を解
決するために、負極にn型ドープ能を有する炭素質材料
を用いる非水系二次電池であって、その炭素質材料が、
60個以上の炭素原子が結合した多面体の球状分子の配
列した結晶構造を有することを特徴とするリチウム二次
電池としたものである。本発明でいう60個以上の炭素
原子が結合した多面体の球状分子の配列した結晶構造を
有する炭素質材料としては、多面体球状分子がC60,C
70,C76等、及びこれらの表面に水素やメチル基等の官
能基を結合させたもの等が使用できる。In order to solve the above problems, the present invention is a non-aqueous secondary battery using a carbonaceous material having an n-type doping ability for a negative electrode, wherein the carbonaceous material is
The lithium secondary battery is characterized by having a crystal structure in which polyhedral spherical molecules in which 60 or more carbon atoms are bonded are arranged. As the carbonaceous material having a crystal structure in which polyhedral spherical molecules in which 60 or more carbon atoms are bonded in the present invention are arranged, polyhedral spherical molecules are C 60 , C
70 , C 76 and the like, and those having a functional group such as hydrogen or a methyl group bonded to the surface thereof can be used.
【0005】[0005]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【0006】(本発明)図1は本発明に係るリチウム二
次電池の模式図で、1は正極活物質LiCoO2 と導電
剤のカーボンブラック、フッ素系樹脂の結着剤からなる
正極で、アルミニウムネットの正極集電体5に圧着され
ている。2は本発明に係るカーボン負極で、多面体球状
分子C60の配列した結晶構造を有する炭素粉末とゴム系
の結着剤からなり、ニッケルネットの負極集電体6に圧
着されている。3はポリプロピレンの微孔膜からなるセ
パレータである。4は電解質で、γ−ブチロラクトンに
LiBF4 を溶解したものを用いている。この本発明電
池を電池Aとする。(Invention) FIG. 1 is a schematic view of a lithium secondary battery according to the present invention. Reference numeral 1 is a positive electrode comprising a positive electrode active material LiCoO 2 , carbon black as a conductive agent, and a binder of a fluorine-based resin. It is pressure-bonded to the positive electrode current collector 5 of the net. Reference numeral 2 denotes a carbon negative electrode according to the present invention, which is composed of carbon powder having a crystal structure in which polyhedral spherical molecules C 60 are arranged and a rubber binder, and is pressure-bonded to a nickel net negative electrode current collector 6. 3 is a separator made of a polypropylene microporous membrane. Reference numeral 4 is an electrolyte, which is prepared by dissolving LiBF 4 in γ-butyrolactone. This battery of the present invention is referred to as Battery A.
【0007】(比較例)電池Aの負極炭素質材料に代え
て、格子面間隔(d002)が3.46Å、a軸及びc
軸方向の結晶子の大きさがそれぞれ25及び19Åの炭
素粉末を用いて電池を作製した。この従来電池を電池B
とする。なお、電池Bの構造は、負極以外は電池Aと同
一構造とした。(Comparative Example) Instead of the negative electrode carbonaceous material of the battery A, the lattice spacing (d002) is 3.46Å, a-axis and c
A battery was produced using carbon powders having crystallite sizes in the axial direction of 25 and 19Å, respectively. This conventional battery is referred to as Battery B.
And The structure of Battery B was the same as that of Battery A except for the negative electrode.
【0008】上記の電池A及びBの初期容量、及び充放
電効率を比較した。その結果を表1に示す。なお、この
時の試験方法としては、充電は定電流定電圧充電であ
り、定電流の電流密度は1mA/cm2 、終止電圧は4.
2V、定電圧充電は電圧が4.2Vで5時間行なった。
また、放電は定電流放電で、電流密度は1mA/cm2 、
終止電圧は3.0Vで行なった。The above-mentioned initial capacities of batteries A and B and charge / discharge efficiency were compared. The results are shown in Table 1. As the test method at this time, the charging was constant current constant voltage charging, the constant current current density was 1 mA / cm 2 , and the final voltage was 4.
The constant voltage charging at 2V was performed at a voltage of 4.2V for 5 hours.
The discharge is constant current discharge, the current density is 1 mA / cm 2 ,
The final voltage was 3.0V.
【0009】 [0009]
【0010】表1より、本発明の電池Aは、従来の電池
Bに比べて初期容量及び充放電効率が格段に優れている
ことがわかった。さらに、電池A及びBを充電状態に
し、常温で30日間放置した時の自己放電量を調査し
た。その結果を表2に示す。From Table 1, it has been found that the battery A of the present invention is far superior to the conventional battery B in initial capacity and charge / discharge efficiency. Furthermore, the batteries A and B were charged and the self-discharge amount when left at room temperature for 30 days was investigated. The results are shown in Table 2.
【0011】 [0011]
【0012】表2より、本発明の電池Aは、従来の電池
Bに比べて自己放電量の少ないことがわかった。また、
電池A及びBの充放電サイクル数と放電容量との関係を
調査した。その結果を図2に示す。図2より、電池Aの
容量は100サイクル経過後もほとんど容量が低下して
いないが、電池Bの容量は50サイクルで初期容量の5
0%に低下していることがわかった。From Table 2, it is found that the battery A of the present invention has a smaller self-discharge amount than the conventional battery B. Also,
The relationship between the number of charge / discharge cycles and the discharge capacity of the batteries A and B was investigated. The result is shown in FIG. From FIG. 2, the capacity of the battery A is almost unchanged after 100 cycles, but the capacity of the battery B is 50 cycles and the initial capacity is 5%.
It was found to have dropped to 0%.
【0013】[0013]
【発明の効果】上述の如く本発明は、高容量でサイクル
性能に優れ、且つ自己放電の小さいリチウム二次電池を
提供できるので、その工業的価値は極めて大きい。INDUSTRIAL APPLICABILITY As described above, the present invention can provide a lithium secondary battery having a high capacity, excellent cycle performance, and a small self-discharge, so that its industrial value is extremely large.
【図1】本発明のリチウム二次電池の模式図である。FIG. 1 is a schematic view of a lithium secondary battery of the present invention.
【図2】本発明電池Aと従来電池Bの充放電サイクル数
と放電容量との関係図である。FIG. 2 is a relationship diagram between the number of charge / discharge cycles and the discharge capacity of the battery A of the present invention and the battery B of the related art.
1 正極 2 負極 3 セパレータ 4 電解液 5 正極集電体 6 負極集電体 1 Positive electrode 2 Negative electrode 3 Separator 4 Electrolyte solution 5 Positive electrode current collector 6 Negative electrode current collector
Claims (1)
を用いる非水系二次電池であって、その炭素質材料が、
炭素原子が結合した多面体の球状分子の配列した結晶構
造を有することを特徴とするリチウム二次電池。1. A non-aqueous secondary battery using a carbonaceous material having an n-type doping ability for a negative electrode, the carbonaceous material comprising:
A lithium secondary battery having a crystal structure in which polyhedral spherical molecules having carbon atoms are arranged.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3270056A JPH0582132A (en) | 1991-09-20 | 1991-09-20 | Lithium secondary battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3270056A JPH0582132A (en) | 1991-09-20 | 1991-09-20 | Lithium secondary battery |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0582132A true JPH0582132A (en) | 1993-04-02 |
Family
ID=17480908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3270056A Pending JPH0582132A (en) | 1991-09-20 | 1991-09-20 | Lithium secondary battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0582132A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06310144A (en) * | 1993-04-23 | 1994-11-04 | Yuasa Corp | Secondary battery |
WO2004032262A1 (en) * | 2002-10-04 | 2004-04-15 | Mitsubishi Chemical Corporation | Additive to negative electrode material for lithium secondary battery, negative electrode material for lithium secondary battery and, using the negative electrode material for lithium secondary battery, negative electrode and lithium secondary battery |
CN1333478C (en) * | 2002-10-04 | 2007-08-22 | 三菱化学株式会社 | Additive for anode material for lithium secondary battery, anode material for lithium secondary battery, anode and lithium secondary battery using the anode material for lithium secondary battery |
US7879260B2 (en) | 2002-10-04 | 2011-02-01 | Mitsubishi Chemical Corporation | Additive for anode material for lithium secondary battery, anode material for lithium secondary battery, anode and lithium secondary battery using the anode material for lithium secondary battery |
-
1991
- 1991-09-20 JP JP3270056A patent/JPH0582132A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06310144A (en) * | 1993-04-23 | 1994-11-04 | Yuasa Corp | Secondary battery |
WO2004032262A1 (en) * | 2002-10-04 | 2004-04-15 | Mitsubishi Chemical Corporation | Additive to negative electrode material for lithium secondary battery, negative electrode material for lithium secondary battery and, using the negative electrode material for lithium secondary battery, negative electrode and lithium secondary battery |
CN1333478C (en) * | 2002-10-04 | 2007-08-22 | 三菱化学株式会社 | Additive for anode material for lithium secondary battery, anode material for lithium secondary battery, anode and lithium secondary battery using the anode material for lithium secondary battery |
US7879260B2 (en) | 2002-10-04 | 2011-02-01 | Mitsubishi Chemical Corporation | Additive for anode material for lithium secondary battery, anode material for lithium secondary battery, anode and lithium secondary battery using the anode material for lithium secondary battery |
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