JPH06310124A - Negative electrode for lithium secondary battery - Google Patents
Negative electrode for lithium secondary batteryInfo
- Publication number
- JPH06310124A JPH06310124A JP5125035A JP12503593A JPH06310124A JP H06310124 A JPH06310124 A JP H06310124A JP 5125035 A JP5125035 A JP 5125035A JP 12503593 A JP12503593 A JP 12503593A JP H06310124 A JPH06310124 A JP H06310124A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- active material
- lithium alloy
- lithium
- 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
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、デンドライトの成長を
抑制できて高起電力性や電池寿命に優れるリチウム二次
電池を形成できる負極電極に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative electrode capable of suppressing the growth of dendrites and forming a lithium secondary battery having high electromotive force and excellent battery life.
【0002】[0002]
【従来の技術】非水電解液を用いてなるリチウム二次電
池において、エネルギー密度や起電力の点よりは金属リ
チウムによる負極形成が有利であるが、金属リチウムは
活性なため充放電の繰返しでデンドライトが成長しやす
い問題点があった。デンドライトは樹枝状の結晶で電流
が集中しやすく、従って一旦発生すると急速に成長して
充放電効率等の電池機能の低下や正負極間での短絡によ
る安全性の問題を誘発する。2. Description of the Related Art In a lithium secondary battery using a non-aqueous electrolyte, it is advantageous to form a negative electrode with metallic lithium in terms of energy density and electromotive force. However, since metallic lithium is active, it can be repeatedly charged and discharged. There was a problem that dendrites tended to grow. Dendrites are dendritic crystals in which current is likely to be concentrated. Therefore, once they occur, they grow rapidly and cause a decrease in battery functions such as charge / discharge efficiency and a safety problem due to a short circuit between the positive and negative electrodes.
【0003】一方、リチウム合金からなる負極活物質を
用いたリチウム二次電池用の負極電極も知られている。
これは、金属リチウムに比べて起電力が低下する場合も
あるが、デンドライトが成長しにくい利点を有してい
る。On the other hand, a negative electrode for a lithium secondary battery using a negative electrode active material composed of a lithium alloy is also known.
This may have lower electromotive force than metallic lithium, but has the advantage that dendrites are less likely to grow.
【0004】しかしながら、前記のリチウム合金からな
る負極活物質は加工性に劣る難点を有しており、シート
状に圧延加工することが困難で粉末の状態で使用する必
要があり、加圧圧着できるコイン型やボタン型等の電池
の形成を可能にするに止まるなど用途の制約が大きい問
題点もあった。However, the above-mentioned negative electrode active material made of a lithium alloy has a drawback in that it is inferior in workability, and it is difficult to roll it into a sheet and it is necessary to use it in a powder state, so that it can be pressure-bonded. There is also a problem that there are large restrictions on the application, such as stopping the formation of coin type or button type batteries.
【0005】[0005]
【発明が解決しようとする課題】本発明は、リチウム合
金からなる負極活物質を用いてそのデンドライトが成長
しにくい利点を活かしつつ、シート状物などとして一体
的に簡便に取扱うことができて種々形態の電池形成に使
用でき、起電力性や充放電のサイクル寿命等の電池機能
に優れるリチウム二次電池を形成できる負極電極の開発
を課題とする。DISCLOSURE OF THE INVENTION The present invention makes it possible to handle a dendrite using a negative electrode active material made of a lithium alloy as a sheet-like material in a simple and integrated manner while taking advantage of the advantage that the dendrite does not easily grow. An object is to develop a negative electrode that can be used for forming a battery in any form and can form a lithium secondary battery having excellent battery functions such as electromotive force and charge / discharge cycle life.
【0006】[0006]
【課題を解決するための手段】本発明は、リチウム合金
の粉末からなる負極活物質を、それよりも融点の低いリ
チウム合金で結着してなることを特徴とするリチウム二
次電池用負極電極、及びかかる負極電極からなる層が耐
熱性金属からなる集電シートに融着付設されていること
を特徴とするリチウム二次電池用負極電極を提供するも
のである。DISCLOSURE OF THE INVENTION The present invention is characterized in that a negative electrode active material made of a powder of a lithium alloy is bound with a lithium alloy having a melting point lower than that of the negative electrode active material. And a layer composed of such a negative electrode is fusion-bonded to a current collector sheet composed of a heat-resistant metal, and a negative electrode for a lithium secondary battery is provided.
【0007】[0007]
【作用】融点の低いリチウム合金で結着した上記構成に
より、リチウム合金からなる負極活物質のデンドライト
が成長しにくい利点を損なうことなく、一体物として簡
便に作業効率よく取扱うことができるシート状等の任意
な形態の強度に優れる負極電極を得ることができる。従
って種々の形態のリチウム二次電池を形成することが可
能になる。[Function] With the above-mentioned structure in which a lithium alloy having a low melting point is bound, a sheet shape or the like that can be easily and efficiently handled as an integrated body without impairing the advantage that the dendrite of the negative electrode active material made of the lithium alloy does not easily grow It is possible to obtain a negative electrode having excellent strength in any of the above. Therefore, it becomes possible to form various types of lithium secondary batteries.
【0008】またリチウム合金による結着で、粉末を加
圧圧着してシート状等に成形した場合のような長さ方向
における品質のバラツキ問題や、集電シート併用のとき
のシートの凹凸化等の変形問題及び電池形成時のシート
よりの圧着粉末の未接着による脱落問題も発生せず、さ
らに有機バインダで結着したときのような粉末の表面コ
ートによる導電性等の低下問題も生じない。従って前記
により、起電力性や充放電のサイクル寿命等の電池機能
に優れるリチウム二次電池用の負極電極とすることがで
きる。[0008] Further, due to the binding by the lithium alloy, there is a problem of quality variation in the length direction such as when the powder is pressure-pressed and molded into a sheet-like shape, and when the current-collecting sheet is used together, the sheet becomes uneven. Does not occur, and the problem of dropping off due to non-adhesion of the pressure-bonded powder from the sheet at the time of forming the battery does not occur, and the problem of reduction in conductivity and the like due to the surface coating of the powder when binding with an organic binder does not occur. Therefore, according to the above, a negative electrode for a lithium secondary battery having excellent battery functions such as electromotive force and charge / discharge cycle life can be obtained.
【0009】[0009]
【実施例】本発明のリチウム二次電池の形成に用いる負
極電極は、リチウム合金の粉末からなる負極活物質をそ
れよりも融点の低いリチウム合金で結着したものであ
り、必要に応じかかる負極電極からなる層を耐熱性金属
からなる集電シートに融着付設したものである。EXAMPLES A negative electrode used for forming a lithium secondary battery of the present invention is a negative electrode active material made of a powder of a lithium alloy bound with a lithium alloy having a melting point lower than that of the negative electrode. The electrode layer is fusion-bonded to a collector sheet made of a heat-resistant metal.
【0010】本発明の負極電極を図1、図2に例示し
た。1がリチウム合金の粉末からなる負極活物質、2が
結着剤としてのリチウム合金、3が負極電極層、4が集
電シートである。なお負極電極からなる層は集電シート
の両面に設けられていてもよいし、片面又は両面に部分
的に設けられていてもよい。The negative electrode of the present invention is illustrated in FIGS. 1 and 2. Reference numeral 1 is a negative electrode active material made of lithium alloy powder, 2 is a lithium alloy as a binder, 3 is a negative electrode layer, and 4 is a current collector sheet. The layer composed of the negative electrode may be provided on both sides of the current collector sheet, or may be partially provided on one side or both sides.
【0011】リチウム合金の粉末からなる負極活物質と
しては、Liと、例えばAl、Pb、Sn、In、Bi等の金
属との2元又は3元以上の合金に必要に応じてSi、C
d、Zn、La等を添加したものなどがあげられ、公知物
のいずれも用いうる。LiとPbの合金にLa等を添加し
て機械的特性を改善したものなども用いうる。好ましく
用いうるものは、400℃以上の融点を有するものであ
る。The negative electrode active material made of lithium alloy powder is a binary or ternary alloy of Li and a metal such as Al, Pb, Sn, In, Bi, etc., if necessary Si or C
Examples thereof include those to which d, Zn, La and the like have been added, and any known material can be used. It is also possible to use an alloy of Li and Pb in which La or the like is added to improve mechanical properties. What can be preferably used is one having a melting point of 400 ° C. or higher.
【0012】高融点の負極活物質の具体例としては、L
i−Al−Si系合金(例えばLi:Al:Siの原子比が
9:5:2のものなど)、Li−Sn−Cd系合金(例え
ばLi:Sn:Cdの原子比が9:2:1のものなど)、
Li−Bi−Cd系合金(例えばLi:Bi:Cdの原子比が
4:1:1のものなど)、Li−Pb−Cd系合金(例え
ばLi:Pb:Cdの原子比が4:1:1のものなど)、
Li−In−Zn系合金(例えばLi:In:Znの原子比が
3:1:1のものなど)があげられる。Specific examples of the high melting point negative electrode active material include L
i-Al-Si based alloy (for example, Li: Al: Si atomic ratio is 9: 5: 2), Li-Sn-Cd based alloy (for example, Li: Sn: Cd atomic ratio is 9: 2: 1 etc.),
Li-Bi-Cd type alloys (for example, Li: Bi: Cd atomic ratio is 4: 1: 1), Li-Pb-Cd type alloys (for example, Li: Pb: Cd atomic ratio is 4: 1 :). 1 etc.),
An example is a Li-In-Zn-based alloy (for example, Li: In: Zn having an atomic ratio of 3: 1: 1).
【0013】負極活物質としてのリチウム合金からなる
粉末は、形成目的の電極形態等に応じて適宜な粒径のも
のを用いてよい。一般には、30μm以下、就中0.1
〜10μm程度の平均粒径のものが用いられる。その平
均粒径が30μmを超えると均質な電極を形成しにくい
場合がある。The powder made of a lithium alloy as the negative electrode active material may have an appropriate particle size depending on the form of the electrode to be formed. Generally, less than 30 μm, especially 0.1
An average particle size of about 10 μm is used. If the average particle size exceeds 30 μm, it may be difficult to form a homogeneous electrode.
【0014】負極活物質を結着するために用いるリチウ
ム合金は、負極活物質としてのリチウム合金よりも融点
の低いものであればよい。好ましくは、融点が300℃
以下、就中200℃以下のリチウム合金が用いられる。The lithium alloy used for binding the negative electrode active material may have a melting point lower than that of the lithium alloy as the negative electrode active material. Preferably, the melting point is 300 ° C
Hereinafter, a lithium alloy having a temperature of 200 ° C. or less is used.
【0015】融点が300℃以下のリチウム合金の例と
しては、Liと、例えばAg、Ba、Ca、Hg、Pd、P
t、Srなどの金属との2元又は3元以上の合金からなる
ものがあげられる。その具体例としては、Li−Ag合
金、Li6Hg、Li4Ba、Li2Ca、Li5Pd、Li5P
t、Li23Sr6などがあげられる。An example of a lithium alloy having a melting point of 300 ° C. or lower is Li and, for example, Ag, Ba, Ca, Hg, Pd, P.
Examples include alloys of binary or ternary or more with metals such as t and Sr. Specific examples thereof, Li-Ag alloy, Li 6 Hg, Li 4 Ba , Li 2 Ca, Li 5 Pd, Li 5 P
t, Li 23 Sr 6 and the like.
【0016】結着用のリチウム合金の使用割合は、負極
活物質用のリチウム合金粉末の1〜30重量%、就中5
〜15重量%が好ましい。その使用割合が1重量%未満
では結着力が弱くて機械的強度に乏しい場合があり、3
0重量%を超えると負極活物質が機能しにくくて電極特
性に乏しくなる場合がある。The proportion of the lithium alloy used for binding is 1 to 30% by weight of the lithium alloy powder for the negative electrode active material, especially 5
-15% by weight is preferred. If the usage ratio is less than 1% by weight, the binding strength may be weak and the mechanical strength may be poor.
If it exceeds 0% by weight, the negative electrode active material may not function easily and the electrode characteristics may be poor.
【0017】本発明の負極電極の形成は、例えば負極活
物質としてのリチウム合金からなる粉末と結着用のリチ
ウム合金の粉末とをアルコール類やグリコール類等の乾
燥容易な分散媒を介して混合し、その混合分散液を注形
方式や塗布方式等の適宜な方式で成形して分散媒を揮散
させたのち加熱して結着用のリチウム合金を溶融させ、
ついで冷却固化させる方法などにより行うことができ
る。For forming the negative electrode of the present invention, for example, a powder of a lithium alloy as a negative electrode active material and a powder of a lithium alloy for binding are mixed through a dispersion medium such as alcohols or glycols which is easy to dry. , The mixed dispersion is molded by an appropriate method such as a casting method or a coating method to volatilize the dispersion medium and then heated to melt the lithium alloy for binding,
Then, it can be carried out by a method of cooling and solidifying.
【0018】また集電シートに負極電極層が密着付設し
たタイプのものは、例えば前記の混合分散液を集電シー
ト上に塗布方式等の適宜な方式で展開して分散媒を揮散
させたのち加熱して結着用のリチウム合金を溶融させ、
ついで冷却固化させる方法などにより行うことができ
る。負極電極層の集電シートとの融着は、かかる冷却固
化過程で良好に達成される。In the case of the type in which the negative electrode layer is closely attached to the current collecting sheet, for example, the above-mentioned mixed dispersion liquid is spread on the current collecting sheet by an appropriate method such as a coating method to volatilize the dispersion medium. Heat to melt the lithium alloy for binding,
Then, it can be carried out by a method of cooling and solidifying. The fusion bonding of the negative electrode layer with the current collecting sheet is satisfactorily achieved in the cooling and solidifying process.
【0019】集電シートとしては、前記の結着用のリチ
ウム合金を溶融させるための加熱温度に耐える適宜な耐
熱性金属(合金を含む)からなるものを用いてよい。一
般には、アルミニウムや銅などの導電性に優れるものが
用いられる。集電シートの厚さは、電極の使用目的等に
応じて適宜に決定され、一般には0.05〜0.5mm、
就中0.1〜0.3mmとされる。なお集電シート上に設
ける負極電極層の厚さも任意で、電極の使用目的等に応
じて適宜に決定してよく、一般には0.05〜0.4m
m、就中0.05〜0.2mmとされる。As the current collector sheet, one made of an appropriate heat-resistant metal (including alloy) that can withstand the heating temperature for melting the above-mentioned lithium alloy for binding may be used. Generally, a material having excellent conductivity such as aluminum or copper is used. The thickness of the collector sheet is appropriately determined according to the purpose of use of the electrode, etc., and is generally 0.05 to 0.5 mm,
Especially, it is 0.1 to 0.3 mm. The thickness of the negative electrode layer provided on the current collector sheet is also arbitrary and may be appropriately determined depending on the purpose of use of the electrode, etc., and is generally 0.05 to 0.4 m.
m, especially 0.05 to 0.2 mm.
【0020】前記の混合分散液の調製に用いる結着用の
リチウム合金の粉末としては、負極活物質としてのリチ
ウム合金の粉末よりもその平均粒径が小さいものが、均
質な電極の形成などの点より好ましく用いられる。一般
には負極活物質用のリチウム合金粉末の1/10〜1/
2倍程度の平均粒径を有するものが結着用として用いら
れる。The lithium alloy powder for binding used in the preparation of the above-mentioned mixed dispersion has a smaller average particle size than the powder of the lithium alloy as the negative electrode active material, but is advantageous in forming a homogeneous electrode. More preferably used. Generally, 1/10 to 1 / l of the lithium alloy powder for the negative electrode active material
Those having an average particle size of about twice are used for binding.
【0021】なお前記の何れの場合においても、リチウ
ム合金粉末の平均粒径が0.01μm未満となると飛散
しやすくて取扱い等の作業性に乏しくなるので0.01
μm以上の粉末を用いることが好ましい。リチウム合金
の粉末は、ボールミル等による粉砕方式やガスアトマイ
ズ方式などの適宜な方式で形成することができる。In any of the above cases, if the average particle size of the lithium alloy powder is less than 0.01 μm, the lithium alloy powder easily scatters, resulting in poor workability such as handling.
It is preferable to use a powder having a size of μm or more. The lithium alloy powder can be formed by an appropriate method such as a crushing method using a ball mill or a gas atomizing method.
【0022】本発明の電極は、リチウム二次電池の負極
を形成するためのものであるが、リチウム二次電池の形
成については、かかる負極電極を用いる点を除いて特に
限定はなく、有機溶媒等による非水電解液と正極電極を
用いて従来に準じて行うことができる。The electrode of the present invention is for forming a negative electrode of a lithium secondary battery, but there is no particular limitation on the formation of the lithium secondary battery except that such a negative electrode is used, and an organic solvent is used. It can be carried out according to the conventional method using the non-aqueous electrolyte and the positive electrode.
【0023】従ってかかる非水電解液の代表例として
は、ジメトキシエタン、テトラヒドロフラン、アセトニ
トリル、プロピレンカーボネート等の適宜な有機溶媒に
リチウム塩を溶解させ、必要に応じ2−メチルフラン、
チオフェン、ピロール、クラウンエーテル等の有機添加
物を溶解させたものなどがあげられる。またリチウム塩
としては、例えばLiI、LiCF3SO3、LiBF4、L
iClO4、LiAlCl4、LiPF6、LiAsF6などがあげ
られる。Therefore, as a typical example of such a non-aqueous electrolyte, a lithium salt is dissolved in an appropriate organic solvent such as dimethoxyethane, tetrahydrofuran, acetonitrile, propylene carbonate and, if necessary, 2-methylfuran,
Examples thereof include those in which organic additives such as thiophene, pyrrole and crown ether are dissolved. Examples of the lithium salt include LiI, LiCF 3 SO 3 , LiBF 4 , L
Examples thereof include iClO 4 , LiAlCl 4 , LiPF 6 , and LiAsF 6 .
【0024】さらに正極についてもカーボンや金属等の
適宜なものを用いることができる。高起電力の点より好
ましく用いうる正極は、一般式:Li−Co−P−O系複
合酸化物を活物質とするものである。Further, as the positive electrode, an appropriate one such as carbon or metal can be used. A positive electrode that can be preferably used from the viewpoint of high electromotive force has a general formula: Li-Co-PO composite oxide as an active material.
【0025】得られたリチウム二次電池に対する充電
は、一定電流を連続して通電する方式のほか、適宜なパ
ルス電源を用いてパルス電流を供給する方式などによっ
ても行うことができる。パルス電流による充電方式で
は、通電・停止が繰り返されるため非水電解液の濃度変
化が抑制されてデンドライトがより成長しにくい利点が
ある。Charging of the obtained lithium secondary battery can be carried out not only by a method of continuously supplying a constant current, but also by a method of supplying a pulse current using an appropriate pulse power source. The charging method using a pulse current has the advantage that dendrites are more difficult to grow because the change in concentration of the non-aqueous electrolyte is suppressed because energization / stopping is repeated.
【0026】実施例1 Li:Al:Siの原子比が9:5:2のLi−Al−Si系
合金からなる平均粒径15μmの粉末(負極活物質)
と、その7重量%のLi5Pd(結着剤)からなる平均粒
径5μmの粉末を、エチレングリコールとイソプロピル
アルコールとの混合分散媒を用いてスラリー状に混合
し、それを厚さ200μmのアルミニウムシート上に塗
布し、加熱下に分散媒を揮散させたのち190℃に加温
してLi5Pd粉末を溶融させ、ついで冷却固化させてLi
−Al−Si系合金粉末がLi5Pd層で結着された厚さ1
10μmの負極電極層を有する電極を得た。なお負極電
極層は、アルミニウムシート上に手で剥がすことができ
ない状態で良好に融着していた。Example 1 Powder having an average particle size of 15 μm and made of a Li—Al—Si type alloy having an atomic ratio of Li: Al: Si of 9: 5: 2 (negative electrode active material).
And 7% by weight of Li 5 Pd (binder) having an average particle size of 5 μm were mixed in a slurry form using a mixed dispersion medium of ethylene glycol and isopropyl alcohol, and a powder having a thickness of 200 μm was mixed. It is applied on an aluminum sheet, the dispersion medium is volatilized under heating, then heated to 190 ° C. to melt the Li 5 Pd powder, and then cooled and solidified to form Li.
-Al-Si alloy powder is bound by Li 5 Pd layer to a thickness of 1
An electrode having a negative electrode layer of 10 μm was obtained. The negative electrode layer was well fused on the aluminum sheet in a state where it could not be peeled off by hand.
【0027】実施例2 Li−Al−Si系合金粉末に代えて、Li:Sn:Cdの原
子比が9:2:1のLi−Sn−Cd系合金を用いたほか
は実施例1に準じて、負極電極層とアルミニウムシート
が良好に融着した負極電極を得た。Example 2 The same as Example 1 except that a Li—Sn—Cd based alloy having an Li: Sn: Cd atomic ratio of 9: 2: 1 was used in place of the Li—Al—Si based alloy powder. Thus, a negative electrode in which the negative electrode layer and the aluminum sheet were well fused was obtained.
【0028】比較例1 Li5Pd粉末に代えて、ポリフッ化ビニリデンを結着剤
に用いたほかは実施例1に準じて負極電極を得た。Comparative Example 1 A negative electrode was obtained in the same manner as in Example 1 except that polyvinylidene fluoride was used as the binder instead of the Li 5 Pd powder.
【0029】比較例2 Li5Pd粉末に代えて、ポリフッ化ビニリデンを結着剤
に用いたほかは実施例2に準じて負極電極を得た。Comparative Example 2 A negative electrode was obtained in the same manner as in Example 2 except that polyvinylidene fluoride was used as the binder instead of the Li 5 Pd powder.
【0030】評価試験 実施例又は比較例で得た負極電極の上に、LiBF4の1
モル/リットル濃度のプロピレンカーボネート溶液をポ
リプロピレン不織布に含浸させてなるセパレータを介し
てLiCo0.75P0.25O2粉末からなる正極を配置してリ
チウム二次電池を形成し、この電池について電流密度1
mA/cm2で、電極間電圧4.2Vまでの充電と起電力
2.0Vまでの放電からなる充放電を100サイクル繰
り返して、サイクル終了時の放電容量と充放電効率を調
べた。Evaluation test On top of the negative electrode obtained in the examples or comparative examples, 1 of LiBF 4
A lithium secondary battery was formed by disposing a positive electrode made of LiCo 0.75 P 0.25 O 2 powder through a separator obtained by impregnating a polypropylene non-woven fabric with a propylene carbonate solution having a mol / liter concentration.
Charging / discharging at a voltage of 4.2 V between electrodes and discharging to an electromotive force of 2.0 V at mA / cm 2 was repeated 100 cycles, and the discharge capacity and charging / discharging efficiency at the end of the cycle were examined.
【0031】前記の結果を表1に示した。The above results are shown in Table 1.
【表1】 [Table 1]
【0032】[0032]
【発明の効果】本発明によれば、一体物として簡便に作
業効率よく取扱うことができるシート状等の任意な形態
の強度や均質性に優れて、デンドライトが成長しにくい
負極電極を得ることができる。また厚さの均一性や平坦
性に優れ、活物質が脱落しにくい品質が安定した集電シ
ート付の負極電極を得ることができる。その結果、放電
容量が大きく、起電力性や充放電のサイクル寿命等の電
池機能、安全性ないし信頼性に優れる種々の形態のリチ
ウム二次電池を形成することが可能になる。According to the present invention, it is possible to obtain a negative electrode in which a dendrite is hard to grow and which is excellent in strength and homogeneity in any form such as a sheet which can be easily and efficiently handled as an integrated body. it can. Further, it is possible to obtain a negative electrode with a current collector sheet which is excellent in thickness uniformity and flatness, and in which quality of the active material is less likely to drop off and which is stable. As a result, it is possible to form various types of lithium secondary batteries having a large discharge capacity and excellent battery functions such as electromotive force and charge / discharge cycle life, and excellent safety and reliability.
【図1】実施例の断面図。FIG. 1 is a sectional view of an example.
【図2】他の実施例の断面図。FIG. 2 is a sectional view of another embodiment.
1:リチウム合金の粉末からなる負極活物質 2:結着剤としてのリチウム合金 3:負極電極層 4:集電シート 1: Negative electrode active material made of lithium alloy powder 2: Lithium alloy as a binder 3: Negative electrode layer 4: Current collecting sheet
Claims (2)
を、それよりも融点の低いリチウム合金で結着してなる
ことを特徴とするリチウム二次電池用負極電極。1. A negative electrode for a lithium secondary battery, comprising a negative electrode active material made of lithium alloy powder and a lithium alloy having a melting point lower than that of the negative electrode active material.
項1に記載のリチウム二次電池用負極電極からなる層が
融着付設されていることを特徴とするリチウム二次電池
用負極電極。2. A negative electrode for a lithium secondary battery, wherein a layer made of the negative electrode for a lithium secondary battery according to claim 1 is fusion-bonded to a current collector sheet made of a heat-resistant metal. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5125035A JPH06310124A (en) | 1993-04-28 | 1993-04-28 | Negative electrode for lithium secondary battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5125035A JPH06310124A (en) | 1993-04-28 | 1993-04-28 | Negative electrode for lithium secondary battery |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06310124A true JPH06310124A (en) | 1994-11-04 |
Family
ID=14900239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5125035A Pending JPH06310124A (en) | 1993-04-28 | 1993-04-28 | Negative electrode for lithium secondary battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06310124A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109830646A (en) * | 2019-01-12 | 2019-05-31 | 哈尔滨工业大学 | A kind of composite metal negative pole and the battery comprising the cathode |
CN112993201A (en) * | 2021-02-04 | 2021-06-18 | 中山大学 | Lithium ion conductor compounded lithium alloy negative electrode material and preparation method and application thereof |
-
1993
- 1993-04-28 JP JP5125035A patent/JPH06310124A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109830646A (en) * | 2019-01-12 | 2019-05-31 | 哈尔滨工业大学 | A kind of composite metal negative pole and the battery comprising the cathode |
CN112993201A (en) * | 2021-02-04 | 2021-06-18 | 中山大学 | Lithium ion conductor compounded lithium alloy negative electrode material and preparation method and application thereof |
CN112993201B (en) * | 2021-02-04 | 2022-04-12 | 中山大学 | Lithium ion conductor compounded lithium alloy negative electrode material and preparation method and application thereof |
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