JP2009211818A - Anode active material for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery using same, and manufacturing method for both of same - Google Patents
Anode active material for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery using same, and manufacturing method for both of same Download PDFInfo
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Abstract
Description
本発明は、電池特性の向上を目的とした非水電解質二次電池の改良に関する。 The present invention relates to an improvement in a non-aqueous electrolyte secondary battery for the purpose of improving battery characteristics.
非水電解質二次電池は、高いエネルギー密度を有し、高容量であるため、携帯機器の駆動電源として広く利用されている。非水電解質二次電池に用いる負極活物質としては、従来、黒鉛が広く用いられているが、黒鉛粒子相互の密着性が低いため、生産効率が低下すると共に、電池特性を十分に高めることができないという問題があった。 Nonaqueous electrolyte secondary batteries have high energy density and high capacity, and are therefore widely used as drive power sources for portable devices. Conventionally, graphite has been widely used as a negative electrode active material for non-aqueous electrolyte secondary batteries. However, since the adhesion between graphite particles is low, production efficiency is lowered and battery characteristics are sufficiently enhanced. There was a problem that I could not.
ここで、下記特許文献１には、黒鉛粒子の表面に非晶質炭素を設ける技術が提案されている。 Here, Patent Document 1 below proposes a technique of providing amorphous carbon on the surface of graphite particles.
特許文献１の技術によると、結晶性の高い黒鉛を用いても、電解液の分解による充電効率の低下を抑制できるとされる。 According to the technique of Patent Document 1, it is said that even if highly crystalline graphite is used, a decrease in charging efficiency due to decomposition of the electrolytic solution can be suppressed.
しかし、この技術では、いまだ電池特性が十分ではないという問題があった。 However, this technique still has a problem that the battery characteristics are not sufficient.
本発明は、上記に鑑みなされたものであって、電池特性に優れた非水電解質二次電池用負極活物質及びこれを用いてなる非水電解質二次電池を提供することを目的とする。 This invention is made | formed in view of the above, Comprising: It aims at providing the negative electrode active material for nonaqueous electrolyte secondary batteries excellent in the battery characteristic, and a nonaqueous electrolyte secondary battery using the same.
上記課題を解決するための第１の本発明は、次のように構成されている。
黒鉛粒子の表面に、単体で焼成した場合の比表面積が２００〜５００ｍ２／ｇ、分子量が３００〜５００の非晶質炭素となる物質が被覆され、且つ、被覆量が黒鉛に対して０．１〜１０質量％である非水電解質二次電池用負極活物質。
The first aspect of the present invention for solving the above problems is configured as follows.
The surface of the graphite particle is coated with a substance that becomes amorphous carbon having a specific surface area of 200 to 500 m 2 / g and a molecular weight of 300 to 500 when fired as a simple substance, and the coating amount is set to 0. The negative electrode active material for nonaqueous electrolyte secondary batteries which is 1-10 mass%.
上記構成によると、黒鉛粒子に被覆された非晶質炭素が負極の密着性を高めるように作用するので、これを用いることにより負極の生産性が向上する。また、黒鉛粒子に被覆された非晶質炭素がＬｉイオンの反応点を増やすように作用し、負荷特性も向上する。 According to the above configuration, the amorphous carbon coated with the graphite particles acts so as to improve the adhesion of the negative electrode, so that the productivity of the negative electrode is improved by using this. In addition, the amorphous carbon coated with the graphite particles acts to increase the reaction points of Li ions, and the load characteristics are also improved.
上記課題を解決するための第２の本発明は、上記非水電解質二次電池用負極活物質を用いてなる非水電解質二次電池である。 A second aspect of the present invention for solving the above problems is a non-aqueous electrolyte secondary battery using the negative electrode active material for a non-aqueous electrolyte secondary battery.
上記課題を解決するための第３の本発明は、次のように構成されている。
黒鉛粒子の表面に、単体で焼成した場合の比表面積が２００〜５００ｍ２／ｇ、分子量が３００〜５００の非晶質炭素となる物質を、黒鉛に対して０．１〜１０質量％を被覆する被覆工程と、前記被覆工程の後、前記黒鉛粒子を焼成する焼成工程と、を備えることを特徴とする非水電解質二次電池用負極活物質の製造方法。
The third aspect of the present invention for solving the above problems is configured as follows.
The surface of graphite particles is coated with 0.1 to 10% by mass with respect to graphite of a substance that becomes amorphous carbon having a specific surface area of 200 to 500 m 2 / g and a molecular weight of 300 to 500 when fired alone. The manufacturing method of the negative electrode active material for nonaqueous electrolyte secondary batteries characterized by including the coating process to perform, and the baking process which bakes the said graphite particle after the said coating process.
上記構成によると、被覆して焼成することにより黒鉛粒子表面に形成される非晶質炭素が負極の密着性を高めるように作用するので、これを用いることにより負極の生産性が向上する。また、被覆して焼成することにより黒鉛粒子表面に形成される非晶質炭素がＬｉイオンの反応点を増やすように作用し、負荷特性も向上する。 According to the above configuration, the amorphous carbon formed on the surface of the graphite particles when coated and fired acts to increase the adhesion of the negative electrode, so that the productivity of the negative electrode is improved by using this. Moreover, the amorphous carbon formed on the surface of the graphite particles by coating and firing acts so as to increase the reaction points of Li ions, and the load characteristics are also improved.
前記被覆する物質としては、二糖類を用いることが好ましく、中でもスクロースがより好ましい。スクロースを用いる場合、焼成温度を８００〜１１００℃とすることが好ましい。 As the substance to be coated, disaccharides are preferably used, and sucrose is more preferable. When using sucrose, it is preferable that a calcination temperature shall be 800-1100 degreeC.
核となる黒鉛粒子としては、平均粒径が１０~３０μｍ、ｄ（００２）値が３．３６５以下であるものを用いることが好ましい。 As graphite particles serving as nuclei, those having an average particle diameter of 10 to 30 μm and a d (002) value of 3.365 or less are preferably used.
上記課題を解決するための第４の本発明は、上記非水電解質二次電池用負極活物質の製造方法を用いてなる非水電解質二次電池の製造方法である。 A fourth aspect of the present invention for solving the above problem is a method for producing a nonaqueous electrolyte secondary battery using the above method for producing a negative electrode active material for a nonaqueous electrolyte secondary battery.
上記で説明したように、本発明によると、密着性及び負荷特性に優れた非水電解質二次電池を得ることができる。 As described above, according to the present invention, a nonaqueous electrolyte secondary battery excellent in adhesion and load characteristics can be obtained.
本発明を実施するための最良の形態を、以下の実施例を通じて、詳細に説明する。なお、本発明は下記の形態に限定されるものではなく、その要旨を変更しない範囲において適宜変更して実施することができる。 The best mode for carrying out the present invention will be described in detail through the following examples. In addition, this invention is not limited to the following form, In the range which does not change the summary, it can change suitably and can implement.
（実施例）
［実施例１］
〔正極の作製〕
コバルト酸リチウム９０質量部と、黒鉛粉末５質量部と、ポリフッ化ビニリデン５質量部と、Ｎ−メチル−２−ピロリドンとを混合して、正極活物質スラリーとした。この正極活物質スラリーをドクターブレード法により厚み１５μｍのアルミニウム製集電体の両面に塗布し、乾燥させた後、ローラプレス機により圧延し、裁断して正極を得た。
(Example)
[Example 1]
[Production of positive electrode]
90 parts by mass of lithium cobaltate, 5 parts by mass of graphite powder, 5 parts by mass of polyvinylidene fluoride, and N-methyl-2-pyrrolidone were mixed to obtain a positive electrode active material slurry. This positive electrode active material slurry was applied to both surfaces of a 15 μm thick aluminum current collector by the doctor blade method, dried, rolled with a roller press, and cut to obtain a positive electrode.
〔負極の作製〕
（被覆工程）
黒鉛粉末と、スクロースとを湿式で混合し、黒鉛粒子表面をスクロースで被覆した。
(Production of negative electrode)
(Coating process)
The graphite powder and sucrose were mixed in a wet manner, and the surface of the graphite particles was coated with sucrose.
（焼成工程）
この後、１０００℃で焼成し、スクロースを炭化させて非晶質炭素とし、これをふるいにかけて分級して、負極活物質となした。このとき、被覆量（炭素化後のスクロースの質量÷黒鉛粒子の質量）を１％とした。質量減少量は、熱重量分析により測定した。
(Baking process)
Then, it baked at 1000 degreeC, carbonized sucrose to amorphous carbon, and this was sieved and classified, and it was set as the negative electrode active material. At this time, the coating amount (mass of sucrose after carbonization ÷ mass of graphite particles) was 1%. The amount of mass loss was measured by thermogravimetric analysis.
上記負極活物質９５質量部と、カルボキシメチルセルロース３質量部と、スチレンブタジエンゴム２質量部と、水と、を混合して、負極活物質スラリーとした。この負極活物質スラリーをドクターブレード法により厚み８μｍの銅製集電体の両面に塗布し、乾燥させた後、ローラプレス機により圧延し、裁断して負極を得た。 95 parts by mass of the negative electrode active material, 3 parts by mass of carboxymethyl cellulose, 2 parts by mass of styrene butadiene rubber, and water were mixed to obtain a negative electrode active material slurry. This negative electrode active material slurry was applied to both sides of a copper current collector having a thickness of 8 μm by the doctor blade method, dried, rolled with a roller press, and cut to obtain a negative electrode.
なお、正極及び負極の活物質塗布量は、正極と負極とが対向する部分での充電容量比（負極充電容量÷正極充電容量）を１．１となるようにした。 The active material application amount of the positive electrode and the negative electrode was set such that the charge capacity ratio (negative electrode charge capacity / positive electrode charge capacity) at the portion where the positive electrode and the negative electrode face each other was 1.1.
〔電極体の作製〕
上記正極及び負極を、ポリエチレン製微多孔膜からなるセパレータを介して巻回し、最外周にポロプロピレン製のテープを貼り付け、この後、プレスして、扁平渦巻電極体とした。
(Production of electrode body)
The positive electrode and the negative electrode were wound through a separator made of a polyethylene microporous film, a polypropylene polypropylene tape was attached to the outermost periphery, and then pressed to obtain a flat spiral electrode body.
〔非水電解質の調整〕
エチレンカーボネートとプロピレンカーボネートとエチルメチルカーボネートを体積比１：１：８（２５℃、１気圧）で混合し、電解質塩としてのＬｉＰＦ６を１．０Ｍ（モル／リットル）となるように溶解して、非水電解質となした。
[Nonaqueous electrolyte adjustment]
Ethylene carbonate, propylene carbonate, and ethyl methyl carbonate are mixed at a volume ratio of 1: 1: 8 (25 ° C., 1 atm), and LiPF 6 as an electrolyte salt is dissolved to 1.0 M (mol / liter). It became a non-aqueous electrolyte.
〔電池の組み立て〕
上記扁平電極体を、角形外装缶内に挿入した。この後、注液口を備える封口体により外装缶の開口を封止し、注液口より非水電解質を注液し、この後注液口を封止して、実施例１に係る非水電解質二次電池を作製した。
[Assembling the battery]
The flat electrode body was inserted into a rectangular outer can. Thereafter, the opening of the outer can is sealed with a sealing body having a liquid injection port, the nonaqueous electrolyte is injected from the liquid injection port, and then the liquid injection port is sealed, so that the nonaqueous solution according to Example 1 is used. An electrolyte secondary battery was produced.
［実施例２］
焼成温度を１１００℃としたこと以外は、上記実施例１と同様にして、実施例２にかかる非水電解質二次電池を作製した。
[Example 2]
A nonaqueous electrolyte secondary battery according to Example 2 was produced in the same manner as in Example 1 except that the firing temperature was 1100 ° C.
［実施例３］
焼成温度を９００℃としたこと以外は、上記実施例１と同様にして、実施例３にかかる非水電解質二次電池を作製した。
[Example 3]
A nonaqueous electrolyte secondary battery according to Example 3 was produced in the same manner as in Example 1 except that the firing temperature was set to 900 ° C.
［実施例４］
焼成温度を８００℃としたこと以外は、上記実施例１と同様にして、実施例４にかかる非水電解質二次電池を作製した。
[Example 4]
A nonaqueous electrolyte secondary battery according to Example 4 was produced in the same manner as in Example 1 except that the firing temperature was 800 ° C.
［比較例１］
焼成温度を１２００℃としたこと以外は、上記実施例１と同様にして、比較例１にかかる非水電解質二次電池を作製した。
[Comparative Example 1]
A nonaqueous electrolyte secondary battery according to Comparative Example 1 was produced in the same manner as in Example 1 except that the firing temperature was 1200 ° C.
［比較例２］
焼成温度を１２００℃としたこと以外は、上記実施例１と同様にして、比較例２にかかる非水電解質二次電池を作製した。
[Comparative Example 2]
A nonaqueous electrolyte secondary battery according to Comparative Example 2 was produced in the same manner as in Example 1 except that the firing temperature was 1200 ° C.
〈密着性試験〉
上記で作製した電池の負極の密着性を確かめるため、アクリル板に両面テープを貼り付け、負極に押し付け、その後垂直に引き上げ、活物質が剥離する強度を測定した。この結果を下記表１に示す。
<Adhesion test>
In order to confirm the adhesion of the negative electrode of the battery prepared above, a double-sided tape was attached to the acrylic plate, pressed against the negative electrode, and then pulled up vertically to measure the strength at which the active material peeled. The results are shown in Table 1 below.
〈負荷特性試験〉
上記で作製した電池を定電流８００ｍＡで電圧が４．２Ｖとなるまで充電し、定電流８００ｍＡで電圧が２．７５Ｖとなるまで放電した。この放電容量を１Ｉｔ放電容量とした。この後、上記条件で充電した後、定電流２４００ｍＡで電圧が２．７５Ｖとなるまで放電した。この放電容量を３Ｉｔ放電容量とした。下記式により負荷特性を算出した。この結果を下記表１に示す。
負荷特性（％）＝３Ｉｔ放電容量÷１Ｉｔ放電容量×１００
<Load characteristic test>
The battery produced above was charged at a constant current of 800 mA until the voltage reached 4.2 V, and discharged at a constant current of 800 mA until the voltage reached 2.75 V. This discharge capacity was set to 1 It discharge capacity. Thereafter, after charging under the above conditions, the battery was discharged at a constant current of 2400 mA until the voltage reached 2.75V. This discharge capacity was taken as 3 It discharge capacity. The load characteristics were calculated by the following formula. The results are shown in Table 1 below.
Load characteristics (%) = 3 It discharge capacity ÷ 1 It discharge capacity × 100
上記表１から、焼成温度が高まると、スクロースの比表面積が小さくなり、密着性が低くなり、負荷特性が高まる傾向にあることがわかる。 From Table 1 above, it can be seen that when the firing temperature is increased, the specific surface area of sucrose is decreased, the adhesion is decreased, and the load characteristics tend to be increased.
ここで、負極に求められる密着性としては５０ｍＮ／ＸＷ以上であることが好ましく、負荷特性としては７５％以上であることが好ましい。このため、焼成後のスクロースの比表面積は２００〜５００ｍ２／ｇであることが好ましく、焼成温度は８００〜１１００℃であることが好ましい。 Here, the adhesion required for the negative electrode is preferably 50 mN / XW or more, and the load characteristic is preferably 75% or more. For this reason, it is preferable that the specific surface area of the sucrose after baking is 200-500 m < 2 > / g, and it is preferable that baking temperature is 800-1100 degreeC.
［実施例５］
スクロースに代えてラフィノースを用いた（ラフィノースの分子量は５００）こと以外は、上記実施例１と同様にして、実施例５にかかる非水電解質二次電池を作製した。
[Example 5]
A nonaqueous electrolyte secondary battery according to Example 5 was produced in the same manner as in Example 1 except that raffinose was used instead of sucrose (the molecular weight of raffinose was 500).
［比較例３］
スクロースに代えてフェノールを用いた（フェノールの分子量は１００）こと以外は、上記実施例１と同様にして、比較例３にかかる非水電解質二次電池を作製した。
[Comparative Example 3]
A nonaqueous electrolyte secondary battery according to Comparative Example 3 was produced in the same manner as in Example 1 except that phenol was used instead of sucrose (the molecular weight of phenol was 100).
［比較例４］
スクロースに代えてポリエチレングリコールを用いた（ポリエチレングリコールの分子量は６００）こと以外は、上記実施例１と同様にして、比較例４にかかる非水電解質二次電池を作製した。
[Comparative Example 4]
A nonaqueous electrolyte secondary battery according to Comparative Example 4 was produced in the same manner as in Example 1 except that polyethylene glycol was used instead of sucrose (polyethylene glycol had a molecular weight of 600).
実施例１、５、比較例３、４にかかる電池について、上記と同様にして密着性試験、負荷特性試験を行った。この結果を下記表２に示す。 The batteries according to Examples 1 and 5 and Comparative Examples 3 and 4 were subjected to an adhesion test and a load characteristic test in the same manner as described above. The results are shown in Table 2 below.
上記表２から、被覆種単体の分子量が大きくなるに伴い、密着性が向上し、且つ負荷特性が低下する傾向にあることがわかる。 From Table 2 above, it can be seen that as the molecular weight of the single coating species increases, the adhesion tends to improve and the load characteristics tend to decrease.
ここで、負極に求められる密着性としては５０ｍＮ／ＸＷ以上であることが好ましく、負荷特性としては７５％以上であることが好ましい。このため、被覆種単体の分子量は３００〜５００であることが好ましい。 Here, the adhesion required for the negative electrode is preferably 50 mN / XW or more, and the load characteristic is preferably 75% or more. For this reason, it is preferable that the molecular weight of a coating seed single-piece | unit is 300-500.
［実施例６］
被覆量を０．１％としたこと以外は、上記実施例１と同様にして、実施例６にかかる非水電解質二次電池を作製した。
[Example 6]
A nonaqueous electrolyte secondary battery according to Example 6 was produced in the same manner as in Example 1 except that the coating amount was 0.1%.
［実施例７］
被覆量を５％としたこと以外は、上記実施例１と同様にして、実施例７にかかる非水電解質二次電池を作製した。
[Example 7]
A nonaqueous electrolyte secondary battery according to Example 7 was produced in the same manner as in Example 1 except that the coating amount was 5%.
［実施例８］
被覆量を１０％としたこと以外は、上記実施例１と同様にして、実施例８にかかる非水電解質二次電池を作製した。
[Example 8]
A nonaqueous electrolyte secondary battery according to Example 8 was fabricated in the same manner as in Example 1 except that the coating amount was 10%.
［比較例５］
被覆量を１５％としたこと以外は、上記実施例１と同様にして、比較例５にかかる非水電解質二次電池を作製した。
[Comparative Example 5]
A nonaqueous electrolyte secondary battery according to Comparative Example 5 was produced in the same manner as in Example 1 except that the coating amount was 15%.
［比較例６］
スクロース被覆を行わなかったこと以外は、上記実施例１と同様にして、比較例３にかかる非水電解質二次電池を作製した。
[Comparative Example 6]
A nonaqueous electrolyte secondary battery according to Comparative Example 3 was produced in the same manner as in Example 1 except that sucrose coating was not performed.
実施例１、６〜８、比較例５、６にかかる電池について、上記と同様にして密着性試験、負荷特性試験を行った。この結果を下記表３に示す。 The batteries according to Examples 1 and 6 to 8 and Comparative Examples 5 and 6 were subjected to an adhesion test and a load characteristic test in the same manner as described above. The results are shown in Table 3 below.
上記表３から、スクロースの被覆量としては、０．１０〜１０質量％が好ましいことがわかる。 From Table 3 above, it is understood that the sucrose coating amount is preferably 0.10 to 10% by mass.
以上に説明したように、本発明によれば、密着性に優れた非水電解質二次電池用負極活物質を提供できる。この負極活物質は負荷特性に優れるので、産業上の利用可能性は大きい。 As described above, according to the present invention, it is possible to provide a negative electrode active material for a non-aqueous electrolyte secondary battery having excellent adhesion. Since this negative electrode active material is excellent in load characteristics, industrial applicability is great.
Claims (6)
前記被覆工程の後、前記黒鉛粒子を焼成する焼成工程と、
を備えることを特徴とする非水電解質二次電池用負極活物質の製造方法。 A substance that becomes amorphous carbon having a specific surface area of 200 to 500 m 2 / g and a molecular weight of 300 to 500 when fired as a single substance on the surface of the graphite particles is 0.1 to 10% by mass with respect to the graphite. A coating process for coating;
A firing step of firing the graphite particles after the coating step;
A method for producing a negative electrode active material for a non-aqueous electrolyte secondary battery.
前記被覆する物質が二糖類である、
ことを特徴とする非水電解質二次電池用負極活物質の製造方法。 In the manufacturing method of the negative electrode active material for nonaqueous electrolyte secondary batteries of Claim 3,
The covering material is a disaccharide;
The manufacturing method of the negative electrode active material for nonaqueous electrolyte secondary batteries characterized by the above-mentioned.
前記被覆する物質がスクロースであり、
前記焼成温度が８００〜１１００℃である、
ことを特徴とする非水電解質二次電池用負極活物質の製造方法。 In the manufacturing method of the negative electrode active material for nonaqueous electrolyte secondary batteries of Claim 3 or 4,
The coating material is sucrose;
The firing temperature is 800 to 1100 ° C.
The manufacturing method of the negative electrode active material for nonaqueous electrolyte secondary batteries characterized by the above-mentioned.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011134572A (en) * | 2009-12-24 | 2011-07-07 | Hitachi Powdered Metals Co Ltd | Anode active material for nonaqueous secondary battery and nonaqueous secondary battery using the same |
| CN102544458A (en) * | 2011-12-30 | 2012-07-04 | 中聚電池研究院有限公司 | Preparation method of modified graphite cathode material of lithium-ion power battery |
| KR20140041887A (en) | 2011-07-29 | 2014-04-04 | 도요타지도샤가부시키가이샤 | Lithium ion secondary battery and production method therefor |
| JP2014530473A (en) * | 2011-10-17 | 2014-11-17 | ロックウッドリチウム ゲゼルシャフト ミット ベシュレンクテル ハフツングＲｏｃｋｗｏｏｄ Ｌｉｔｈｉｕｍ ＧｍｂＨ | Battery active material |
| CN107546367A (en) * | 2016-06-29 | 2018-01-05 | 汽车能源供应公司 | Lithium ion secondary battery cathode and lithium rechargeable battery |
| JP2018006072A (en) * | 2016-06-29 | 2018-01-11 | オートモーティブエナジーサプライ株式会社 | Negative electrode of lithium-ion secondary battery |
| US10381638B2 (en) | 2015-08-27 | 2019-08-13 | Samsung Sdi Co., Ltd. | Negative active material for rechargeable lithium battery, and rechargeable lithium battery including the same |
| US11411213B2 (en) | 2014-06-02 | 2022-08-09 | Samsung Sdi Co., Ltd. | Negative active material for rechargeable lithium battery, and rechargeable lithium battery including same |
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| JP2006196404A (en) * | 2005-01-17 | 2006-07-27 | Sharp Corp | Lithium secondary battery |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011134572A (en) * | 2009-12-24 | 2011-07-07 | Hitachi Powdered Metals Co Ltd | Anode active material for nonaqueous secondary battery and nonaqueous secondary battery using the same |
| KR20140041887A (en) | 2011-07-29 | 2014-04-04 | 도요타지도샤가부시키가이샤 | Lithium ion secondary battery and production method therefor |
| US9929398B2 (en) | 2011-07-29 | 2018-03-27 | Toyota Jidosha Kabushiki Kaisha | Lithium-ion secondary battery and method of manufacturing the same |
| JP2014530473A (en) * | 2011-10-17 | 2014-11-17 | ロックウッドリチウム ゲゼルシャフト ミット ベシュレンクテル ハフツングＲｏｃｋｗｏｏｄ Ｌｉｔｈｉｕｍ ＧｍｂＨ | Battery active material |
| US10403885B2 (en) | 2011-10-17 | 2019-09-03 | Albemarle Germany Gmbh | Active material for batteries |
| CN102544458A (en) * | 2011-12-30 | 2012-07-04 | 中聚電池研究院有限公司 | Preparation method of modified graphite cathode material of lithium-ion power battery |
| US11411213B2 (en) | 2014-06-02 | 2022-08-09 | Samsung Sdi Co., Ltd. | Negative active material for rechargeable lithium battery, and rechargeable lithium battery including same |
| US10381638B2 (en) | 2015-08-27 | 2019-08-13 | Samsung Sdi Co., Ltd. | Negative active material for rechargeable lithium battery, and rechargeable lithium battery including the same |
| CN107546367A (en) * | 2016-06-29 | 2018-01-05 | 汽车能源供应公司 | Lithium ion secondary battery cathode and lithium rechargeable battery |
| JP2018006071A (en) * | 2016-06-29 | 2018-01-11 | オートモーティブエナジーサプライ株式会社 | Negative electrode of lithium-ion secondary battery |
| JP2018006072A (en) * | 2016-06-29 | 2018-01-11 | オートモーティブエナジーサプライ株式会社 | Negative electrode of lithium-ion secondary battery |
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