JP2001185127A - Lithium secondary battery - Google Patents
Lithium secondary batteryInfo
- Publication number
- JP2001185127A JP2001185127A JP36725799A JP36725799A JP2001185127A JP 2001185127 A JP2001185127 A JP 2001185127A JP 36725799 A JP36725799 A JP 36725799A JP 36725799 A JP36725799 A JP 36725799A JP 2001185127 A JP2001185127 A JP 2001185127A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- secondary battery
- lithium secondary
- battery
- active material
- 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]
【発明の属する技術分野】この発明は、リチウム２次電
池の負極活物質の改良に関し、特に、エネルギー密度や
サイクル特性、安全性に優れたリチウム２次電池を実現
する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a negative electrode active material of a lithium secondary battery, and more particularly to a technique for realizing a lithium secondary battery excellent in energy density, cycle characteristics and safety.
【０００２】[0002]
【従来の技術】リチウム２次電池の負極活物質として
は、従来からリチウム金属（純リチウム）、リチウムを
吸蔵／放出できるアルミニウム合金系、層間にリチウム
を吸蔵する炭素系材料などが知られている。2. Description of the Related Art As a negative electrode active material for a lithium secondary battery, lithium metal (pure lithium), an aluminum alloy based material capable of absorbing / releasing lithium, and a carbon based material capable of absorbing lithium between layers have been known. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら負極活物
質としてリチウム金属を用いた場合には、高容量の負極
が得られる反面、いわゆるデンドライトが生じて短絡や
発火を生じるおそれがある。また充放電サイクルの繰り
返しにより電極にクラックを生じやすく長寿命化が困難
であるといった問題もある。一方、負極活物質として合
金系材料や炭素系材料を用いた場合には、リチウム金属
の場合に比べてデンドライトのおそれは少ないものの過
充電や過放電の際における結晶構造の崩壊や不可逆物質
の生成による活物質の劣化などの問題がある。However, when lithium metal is used as the negative electrode active material, a high-capacity negative electrode can be obtained, but on the other hand, so-called dendrite may be generated to cause a short circuit or ignition. In addition, there is a problem that cracks are easily generated in the electrode due to repetition of the charge / discharge cycle, and it is difficult to extend the life. On the other hand, when an alloy-based material or a carbon-based material is used as the negative electrode active material, the risk of dendrite is reduced as compared with the case of lithium metal, but the crystal structure collapses during overcharge or overdischarge and the generation of irreversible material There is a problem such as deterioration of the active material due to.
【０００４】ところで、本発明者らはリチウム２次電池
のさらなる小型化・高容量化に向けた鋭意研究の結果、
負極活物質の改良により従来に比べ優れた特性を有する
リチウム２次電池を構成することができることを知見し
た。[0004] The inventors of the present invention have conducted intensive studies for further miniaturization and higher capacity of a lithium secondary battery.
It has been found that the improvement of the negative electrode active material can constitute a lithium secondary battery having characteristics superior to those of the conventional lithium secondary battery.
【０００５】本発明は、サイクル特性や安全性に優れ、
エネルギー密度の高いリチウム２次電池を提供すること
を目的とする。The present invention has excellent cycle characteristics and safety,
It is an object to provide a lithium secondary battery having a high energy density.
【０００６】[0006]
【課題を解決するための手段】この目的を達成する本発
明の第１の請求項に記載のリチウム２次電池は、珪素と
非晶質二酸化珪素とを同時にターゲットとしたスパッタ
により堆積形成した負極活物質を含む負極と、リチウム
含有酸化物を正極活物質として含む正極と、リチウムイ
オンを含む非水電解液とを備えて構成される。According to a first aspect of the present invention, there is provided a lithium secondary battery comprising a negative electrode deposited and formed by sputtering simultaneously using silicon and amorphous silicon dioxide as targets. The battery includes a negative electrode containing an active material, a positive electrode containing a lithium-containing oxide as a positive electrode active material, and a non-aqueous electrolyte containing lithium ions.
【０００７】また、本発明の第２の請求項に記載のリチ
ウム２次電池は、請求項１に記載のリチウム２次電池で
あって、前記負極が、集電体表面に珪素と非晶質二酸化
珪素とを同時にターゲットとするスパッタを施してなる
ものであることとする。[0007] A lithium secondary battery according to a second aspect of the present invention is the lithium secondary battery according to the first aspect, wherein the negative electrode has silicon and amorphous on the surface of the current collector. It is assumed that the target is sputtered simultaneously with silicon dioxide as a target.
【０００８】さらに、本発明の第３の請求項に記載のリ
チウム２次電池は、請求項１に記載のリチウム２次電池
であって、前記負極が、珪素と非晶質二酸化珪素とを同
時にターゲットとするスパッタにより堆積形成した負極
活物質の粉砕物に導電材および結着剤を加えた混合物を
集電体表面に塗布したものであることとする。Further, a lithium secondary battery according to a third aspect of the present invention is the lithium secondary battery according to the first aspect, wherein the negative electrode comprises silicon and amorphous silicon dioxide simultaneously. It is assumed that a mixture obtained by adding a conductive material and a binder to a pulverized product of a negative electrode active material deposited and formed by sputtering as a target is applied to the surface of the current collector.
【０００９】[0009]
【作用】非晶質二酸化珪素と同時に珪素、銀などをター
ゲットとするスパッタにより堆積形成される物質は、非
晶質二酸化珪素マトリクス中に珪素や銀などの微粒子が
分散した状態にあることが報告されている。この物質を
リチウム２次電池の負極として使用することで次の効果
が期待される。[Function] It is reported that a substance deposited by sputtering simultaneously with amorphous silicon dioxide as a target of silicon, silver, etc., has fine particles of silicon, silver, etc. dispersed in an amorphous silicon dioxide matrix. Have been. The following effects are expected by using this substance as a negative electrode of a lithium secondary battery.
【００１０】非晶質マトリクス中にリチウムと化合物を
構成する元素を微粒子として含むことにより、リチウム
の吸蔵放出に伴う膨張収縮によって引き起こされる電極
のクラックが抑えられ、リチウム２次電池のサイクル特
性を著しく改善することができると考えられる。[0010] When the element constituting the compound with lithium is contained in the amorphous matrix as fine particles, cracks in the electrode caused by expansion and contraction caused by the insertion and extraction of lithium are suppressed, and the cycle characteristics of the lithium secondary battery are remarkably improved. It can be improved.
【００１１】[0011]
【発明の実施の形態】＝＝＝評価用電池＝＝＝ 本発明によるリチウム２次電池の特性を評価するため、
図１に示す評価用電池１を作成した。評価用電池１の外
形寸法は直径２４ｍｍ、高さ５ｍｍである。耐有機電解
液性のステンレス鋼板でできた電池ケース１０と、これ
と同材質の封口板１１とをポリプロピレン製のガスケッ
ト１２により封止している。電池ケース１０と封口板１
１で封止された電池内部には電池の構成部材が収容され
ている。この構成部材は電池ケース１０の底部に形成さ
れた集電体１３と、この集電体１３上に積層され負極活
物質を含んだ負極合剤層１４と、この負極合剤層１４よ
りも上に積層され正極活物質となる金属リチウム層１５
と、負極合剤層１４および金属リチウム層１５を絶縁す
るポリプロピレン製の微孔性セパレータ１６とを含んで
いる。電池ケース１０と封口板１１およびガスケット１
２で封止された電池内部には非水電解液としてエチレン
カーボネートとジエチルカーボネートの等容積混合溶媒
にＬｉＰＦ６を溶解させた１規定溶液が封入されてい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS === Evaluation Battery === In order to evaluate the characteristics of a lithium secondary battery according to the present invention,
An evaluation battery 1 shown in FIG. 1 was prepared. The external dimensions of the evaluation battery 1 are 24 mm in diameter and 5 mm in height. A battery case 10 made of an organic electrolytic solution-resistant stainless steel plate and a sealing plate 11 made of the same material are sealed with a gasket 12 made of polypropylene. Battery case 10 and sealing plate 1
The components of the battery are housed inside the battery sealed with 1. The constituent members include a current collector 13 formed on the bottom of the battery case 10, a negative electrode mixture layer 14 stacked on the current collector 13 and containing a negative electrode active material, and a layer above the negative electrode mixture layer 14. Lithium layer 15 laminated as a cathode active material
And a microporous separator 16 made of polypropylene that insulates the negative electrode mixture layer 14 and the metal lithium layer 15. Battery case 10, sealing plate 11, and gasket 1
A 1 N solution of LiPF 6 dissolved in an equal volume mixed solvent of ethylene carbonate and diethyl carbonate is sealed as a non-aqueous electrolyte inside the battery sealed with 2.
【００１２】＝＝＝各評価用電池の負極合剤層＝＝＝ 本実施例では、以上の基本構成からなる評価用電池１に
おいて負極合剤層１４の構成のみを変えた、以下の実施
例１および比較例１〜３の計４種の評価用電池を作成し
た。=== Negative Electrode Mixing Layer of Each Evaluation Battery === In the present embodiment, only the configuration of the negative electrode mixing layer 14 in the evaluation battery 1 having the above basic configuration was changed. A total of four types of batteries for evaluation, 1 and Comparative Examples 1 to 3, were prepared.
【００１３】＜実施例１＞この電池では銅箔集電体１３
上にリチウムと反応しない非晶質二酸化珪素と負極活物
質となる珪素をスパッタにより堆積形成することで負極
合剤層１４を形成した。図２はこのスパッタに用いたＲ
Ｆスパッタ装置の概略構成である。スパッタは、ターゲ
ットとなる非晶質二酸化珪素Ａをターゲットステージ２
１上に載置するとともにこの非晶質二酸化珪素Ａのエロ
ージョン部にもう一つのターゲットとなるシリコンウエ
ハから切り出した珪素チップＢ（５ｍｍ×５ｍｍ×１ｍ
ｍ）１６枚を載置し、非晶質二酸化珪素および珪素を同
時にターゲットとして行った。なお、スパッタされる側
の銅箔集電体１３は基盤ホルダ２３にセットした。スパ
ッタ条件はＲＦパワー約２３０Ｗ、アルゴン圧力２．０
×１０−２Ｔｏｒｒとした。<Example 1> In this battery, a copper foil current collector 13 was used.
The negative electrode mixture layer 14 was formed by depositing amorphous silicon dioxide not reacting with lithium and silicon serving as a negative electrode active material by sputtering. FIG. 2 shows the R used for this sputtering.
1 is a schematic configuration of an F sputtering apparatus. In the sputtering, the amorphous silicon dioxide A serving as a target is
1 and a silicon chip B (5 mm × 5 mm × 1 m) cut out from a silicon wafer serving as another target on the erosion portion of the amorphous silicon dioxide A.
m) Sixteen sheets were placed, and amorphous silicon dioxide and silicon were simultaneously used as targets. The copper foil current collector 13 on the side to be sputtered was set on the substrate holder 23. Sputtering conditions: RF power about 230 W, argon pressure 2.0
× 10 −2 Torr.
【００１４】以上のようにしてスパッタを行った後、銅
箔集電体１３表面の状態をＸ線回折により測定した。図
３はその測定結果である。この図に示すように銅箔集電
体１３を構成する銅原子に起因するピーク以外には目立
ったピークは存在しない。このことから非晶質二酸化珪
素および珪素は非常に小さな微粒子あるいは原子の状態
で単分散しているものと推察される。After the sputtering as described above, the state of the surface of the copper foil current collector 13 was measured by X-ray diffraction. FIG. 3 shows the measurement results. As shown in this figure, there is no conspicuous peak other than the peak caused by the copper atoms constituting the copper foil current collector 13. This suggests that amorphous silicon dioxide and silicon are monodispersed in the form of very small particles or atoms.
【００１５】この負極合剤層１４が形成された銅箔集電
体１３を真空乾燥機により６０℃下で６時間減圧乾燥
し、これを組み込んで評価用電池を作成した。The copper foil current collector 13 on which the negative electrode mixture layer 14 was formed was dried under reduced pressure at 60 ° C. for 6 hours using a vacuum dryer, and this was assembled to prepare a battery for evaluation.
【００１６】＜比較例１＞比較例１の電池では、実施例
１の前記珪素チップに代えて銀チップ（１０ｍｍ×１０
ｍｍ×１ｍｍ）４枚を用いた。なお、それ以外の方法お
よび構成は実施例１と同様の方法と全く同様にして評価
用電池を作成した。Comparative Example 1 In the battery of Comparative Example 1, a silver chip (10 mm × 10 mm) was used instead of the silicon chip of Example 1.
mm × 1 mm). Except for this, the method and configuration were exactly the same as those in Example 1 to prepare a battery for evaluation.
【００１７】＜比較例２＞比較例２では、実施例１のよ
うなスパッタを用いずに従来の方法で負極合剤層１４を
形成した。すなわち、負極活物質となる黒鉛（ＳＦＧ−
６）９６重量％と、結着剤となるポリテトラフルオロエ
チレン４重量％とを混合しその所定量をＮｉメッシュ集
電体１３上に加圧成形した後、真空乾燥機で減圧乾燥
（１２０℃、６時間）し、このようにして作成された負
極合剤層１４が形成されたＮｉメッシュ集電体１３を組
み込んで評価用電池を作成した。なお、それ以外の方法
および構成は実施例１の場合と全く同様である。Comparative Example 2 In Comparative Example 2, the negative electrode mixture layer 14 was formed by a conventional method without using sputtering as in Example 1. That is, graphite (SFG-
6) 96% by weight and 4% by weight of polytetrafluoroethylene serving as a binder are mixed, and a predetermined amount thereof is pressed and formed on a Ni mesh current collector 13, followed by drying under reduced pressure with a vacuum dryer (120 ° C.). , 6 hours), and a battery for evaluation was prepared by incorporating the Ni mesh current collector 13 on which the negative electrode mixture layer 14 thus formed was formed. The other methods and configurations are exactly the same as those in the first embodiment.
【００１８】＜比較例３＞比較例３では、負極活物質と
なる珪素粉末１０重量％と、導電剤となる黒鉛（ＳＦＧ
−６）８０重量％と、結着剤となるポリテトラフルオロ
エチレン１０重量％とを混合し、その所定量をＮｉメッ
シュ集電体１３上に加圧成形した後、真空乾燥機で減圧
乾燥（１２０℃、６時間）して負極合剤層１４を形成し
た。すなわち、比較例３では負極活物質としては実施例
１と同様に珪素を用いているが、スパッタではなく単に
混合することで負極合剤層１４を形成した。このように
して作成された負極合剤層１４が形成されたＮｉメッシ
ュ集電体１３を組み込んで評価用電池を作成した。な
お、それ以外の方法および構成は実施例１の場合と全く
同様である。Comparative Example 3 In Comparative Example 3, 10% by weight of silicon powder as an anode active material and graphite (SFG) as a conductive agent were used.
-6) 80% by weight and 10% by weight of polytetrafluoroethylene serving as a binder are mixed, and a predetermined amount thereof is pressed and formed on a Ni mesh current collector 13 and then dried under reduced pressure by a vacuum drier ( (120 ° C., 6 hours) to form the negative electrode mixture layer 14. That is, in Comparative Example 3, silicon was used as the negative electrode active material in the same manner as in Example 1, but the negative electrode mixture layer 14 was formed by simple mixing instead of sputtering. A battery for evaluation was prepared by incorporating the Ni mesh current collector 13 on which the negative electrode mixture layer 14 thus formed was formed. The other methods and configurations are exactly the same as those in the first embodiment.
【００１９】＝＝＝試験＝＝＝ 以上のようにして作成した各評価用電池を１週間エージ
ングした後、０．１ｍＡ／ｃｍ２の電流で、充電の終止
電圧を２．０Ｖ、放電の終止電圧を０．００５Ｖとして
充放電試験を行った。実施例１の電池におけるサイクル
特性を図４に、また、比較例１〜４のサイクル特性をそ
れぞれ図５〜図７に示す。なお、グラフの横軸は充放電
回数（サイクル数）、縦軸は充電容量である。=== Test === After aging each of the evaluation batteries prepared as described above for one week, at a current of 0.1 mA / cm 2 , the charging end voltage was 2.0 V, the discharging end was 2.0 V. A charge / discharge test was performed at a voltage of 0.005 V. FIG. 4 shows the cycle characteristics of the battery of Example 1, and FIGS. 5 to 7 show the cycle characteristics of Comparative Examples 1 to 4, respectively. Note that the horizontal axis of the graph is the number of times of charging and discharging (the number of cycles), and the vertical axis is the charging capacity.
【００２０】図４からわかるように実施例１の電池は１
００サイクル目においても６００〜９００ｍＡｈ／ｇの
高容量を維持しており、実施例１の電池が優れた充放電
特性を有している。As can be seen from FIG. 4, the battery of the first embodiment
Even in the 00th cycle, a high capacity of 600 to 900 mAh / g is maintained, and the battery of Example 1 has excellent charge / discharge characteristics.
【００２１】これに対し図５に示すように比較例１の電
池は２００ｍＡｈ／ｇ以下の充電容量しか示していな
い。このことから前述したターゲットは銀を用いるより
も実施例１のように珪素を用いた方が充放電特性が向上
することがわかる。On the other hand, as shown in FIG. 5, the battery of Comparative Example 1 has a charge capacity of not more than 200 mAh / g. This shows that the charge / discharge characteristics of the target described above are improved when silicon is used as in Example 1 as compared with the case where silver is used.
【００２２】また、図６に示すように比較例２の負極合
剤層１４が炭素材料からなる従来構成の電池において
は、充電容量は殆ど一定で優れたサイクル特性を示して
いるものの充電容量は約３３０ｍＡｈ／ｇ程度にしかな
らない。従って、実施例１の電池は炭素材料からなる従
来構成の電池に比べてかなり高容量であることがわか
る。Further, as shown in FIG. 6, in the battery of the comparative example 2 in which the negative electrode mixture layer 14 is made of a carbon material, the charge capacity is almost constant and the cycle capacity is excellent, but the charge capacity is high. It is only about 330 mAh / g. Therefore, it can be seen that the battery of Example 1 has a considerably higher capacity than the battery of the conventional configuration made of a carbon material.
【００２３】さらに、図７示すように比較例３の場合は
初期充電時には高容量を示すものの充放電回数が増すに
つれて急速に充電容量が劣化している。すなわち、負極
活物質として同じ珪素を用いた場合には、比較例３のよ
うに従来のように混合により負極合剤層１４を形成する
よりも実施例１のようにスパッタにより負極合剤層１４
を形成する方がサイクル特性が格段に向上することがわ
かる。Further, as shown in FIG. 7, in the case of Comparative Example 3, although the capacity is high at the time of initial charging, the charging capacity is rapidly deteriorated as the number of times of charging and discharging increases. That is, when the same silicon is used as the negative electrode active material, the negative electrode mixture layer 14 is sputtered as in Example 1 rather than the negative electrode mixture layer 14 formed by mixing as in Comparative Example 3 as in the related art.
It can be seen that the cycle characteristics are significantly improved by forming.
【００２４】＝＝＝その他＝＝＝ ところで、この実施例では前述のようにターゲットステ
ージ２１上に非晶質二酸化珪素Ａ上に珪素チップＢを載
置するようにしてスパッタを行っているが、非晶質二酸
化珪素Ａと珪素チップＢをこのように重ねるのではなく
これらをターゲートステージ２１上に別々に離間させて
載置するようにしてもよい。=== Others === By the way, in this embodiment, the sputtering is performed by mounting the silicon chip B on the amorphous silicon dioxide A on the target stage 21 as described above. Instead of overlapping the amorphous silicon dioxide A and the silicon chip B in this manner, they may be separately mounted on the target stage 21 so as to be separated from each other.
【００２５】また、前述した実施例では銅箔集電体１３
に対して直接にスパッタを行うようにしているが、基盤
ホルダ２３に適宜な材質の基盤をセットし、この基盤表
面に非晶質二酸化珪素および珪素をターゲットとしてス
パッタを行い、基盤表面に形成された堆積層を剥がして
粉砕し、これに導電材や結着剤を混ぜて負極合剤層１４
を形成するようにしてもよい。In the above-described embodiment, the copper foil current collector 13 is used.
Is sputtered directly on the substrate, but a substrate of an appropriate material is set in the substrate holder 23, and sputtering is performed on the surface of the substrate using amorphous silicon dioxide and silicon as targets to form the substrate. The deposited layer is peeled off and pulverized, mixed with a conductive material and a binder, and mixed with a negative electrode mixture layer 14.
May be formed.
【００２６】また、スパッタはＲＦスパッタではなくＤ
Ｃスパッタであってもよい。The sputtering is not RF sputtering but D
C sputtering may be used.
【００２７】[0027]
【発明の効果】以上詳細に説明したように、本発明によ
ればサイクル特性や安全性に優れ、エネルギー密度の高
いリチウム２次電池を提供することができる。As described above in detail, according to the present invention, a lithium secondary battery having excellent cycle characteristics and safety and high energy density can be provided.
【図１】この発明の一実施例による評価用電池の側断面
を示す図である。FIG. 1 is a diagram showing a side cross section of an evaluation battery according to one embodiment of the present invention.
【図２】この発明の一実施例において用いたＲＦスパッ
タ装置の概略構成を示す図である。FIG. 2 is a diagram showing a schematic configuration of an RF sputtering apparatus used in one embodiment of the present invention.
【図３】この発明の一実施例による銅箔集電体表面をＸ
線回折で測定した際の測定結果を示す図である。FIG. 3 shows the surface of a copper foil current collector according to an embodiment of the present invention as X.
It is a figure showing the measurement result at the time of measuring by line diffraction.
【図４】実施例１の評価用電池の充放電特性を示す図で
ある。FIG. 4 is a diagram showing the charge / discharge characteristics of the evaluation battery of Example 1.
【図５】比較例１の評価用電池の充放電特性を示す図で
ある。FIG. 5 is a diagram showing charge / discharge characteristics of an evaluation battery of Comparative Example 1.
【図６】比較例２の評価用電池の充放電特性を示す図で
ある。FIG. 6 is a diagram showing charge / discharge characteristics of an evaluation battery of Comparative Example 2.
【図７】比較例３の評価用電池の充放電特性を示す図で
ある。FIG. 7 is a diagram showing charge / discharge characteristics of an evaluation battery of Comparative Example 3.
１４ 負極合剤層 １５ 金属リチウム層 14 Negative electrode mixture layer 15 Metal lithium layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｍ 4/48 Ｈ０１Ｍ 4/48 10/40 10/40 Ｚ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H01M 4/48 H01M 4/48 10/40 10/40 Z
Claims (3)
ゲットとしたスパッタにより堆積形成した負極活物質を
含む負極と、リチウム含有酸化物を正極活物質として含
む正極と、リチウムイオンを含む非水電解液とを備えて
構成されるリチウム２次電池。1. A negative electrode containing a negative electrode active material deposited and formed by sputtering simultaneously using silicon and amorphous silicon dioxide as targets, a positive electrode containing a lithium-containing oxide as a positive electrode active material, and a non-aqueous solution containing lithium ions. A lithium secondary battery comprising an electrolyte.
って、前記負極が、集電体表面に珪素と非晶質二酸化珪
素とを同時にターゲットとするスパッタを施してなるも
のであることを特徴とするリチウム２次電池。2. The lithium secondary battery according to claim 1, wherein the negative electrode is formed by sputtering the surface of a current collector with silicon and amorphous silicon dioxide as targets simultaneously. A lithium secondary battery characterized by the above-mentioned.
って、前記負極が、珪素と非晶質二酸化珪素とを同時に
ターゲットとするスパッタにより堆積形成した負極活物
質の粉砕物に導電材および結着剤を加えた混合物を集電
体表面に塗布したものであることを特徴とするリチウム
２次電池。3. The lithium secondary battery according to claim 1, wherein the negative electrode is formed of a pulverized negative electrode active material formed by sputtering using silicon and amorphous silicon dioxide as targets simultaneously. And a mixture obtained by adding a binder to the surface of the current collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36725799A JP2001185127A (en) | 1999-12-24 | 1999-12-24 | Lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36725799A JP2001185127A (en) | 1999-12-24 | 1999-12-24 | Lithium secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001185127A true JP2001185127A (en) | 2001-07-06 |
Family
ID=18488870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36725799A Pending JP2001185127A (en) | 1999-12-24 | 1999-12-24 | Lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001185127A (en) |
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