JP2022505652A - 負極活物質及びこれを含むリチウム二次電池 - Google Patents
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Abstract
Description
本出願は2018年11月19日付韓国特許出願第10-2018-0142862号に基づいた優先権の利益を主張し、当該韓国特許出願の文献に開示された全ての内容は本明細書の一部として含まれる。
本発明は、負極活物質、具体的にリチウム二次電池用負極活物質を提供する。
また、本発明は、前述した負極活物質を含むリチウム二次電池用負極及び前記リチウム二次電池用負極を含むリチウム二次電池を提供する。
0.5MのNaOH水溶液100gとエタノール30gの混合物に1-ピレン酪酸(1-pyrenebutyric acid、PBA)0.03gを溶かした。準備された溶液に単一壁炭素ナノチューブ(SWNT)0.003gを入れ、棒タイプの超音波分散(probe-type sonication)を30分間実施してから、Si粉末1gを準備された溶液に入れて30分間超音波分散した後、1時間撹拌を実施した。このように準備された分散溶液を濾過し水を数回注ぎながら濾過を介して洗浄を行った。得られた物質を130℃で12時間真空オーブンで乾燥させ、Si/PBA/SWNT(Siに対するSWNTの重量%を示す)0.3%を得た。
実施例1で製造されたSi/PBA/SWNT0.3%を比較例1の負極活物質として用いた。
比較例2は、実施例1で用いられたSiとポリ(ジメチルシロキサン)(PDMS)オリゴマー前駆体を90:10重量比でアセトン溶媒に投入して1時間撹拌した後、硬化剤をPDMSオリゴマー前駆体対比10重量%の量で入れ、60℃で24時間撹拌しながら反応を行い、PDMS弾性高分子をSi表面に形成させたもの(Si-PDMS)を比較例2の負極活物質として用いた。
比較例3は、比較例2で製造されたSi-PDMSを負極活物質として用い、但し、Si-PDMS:黒鉛:SWNT:PBA:Super-C:PVDF=68.5:0.21:2:4.79:20の重量比で混合した負極スラリーを製造して実施例1と同一の方法で負極を製造した。
前記実施例1と、比較例1から3で製造された負極を用いてコイン型半電池を製造した。正極としては金属リチウムホイルを用い、前記負極と正極との間にポリエチレン分離膜を介在して電極組立体を製造した。
前記実施例1から3と、比較例1から3で製造された負極を用いて製造されたコイン型半電池の充電・放電特性を評価した。
前記実施例1と、比較例1から3で製造された負極を用いて製造されたコイン型半電池の充電・放電特性を評価した。
Claims (11)
- リチウムイオンが吸蔵及び放出され得る活物質コアと、
前記活物質コアの表面に位置する導電材と、
前記活物質コアと前記導電材を連結する有機連結体(organic linker)と、
前記活物質コア及び前記導電材の少なくとも一部を覆う弾性高分子とを含み、
前記導電材は、線状導電材、及び面状導電材よりなる群から選択された少なくとも1種を含み、
前記有機連結体は、疎水性構造及び極性官能基を含む置換基を含む化合物である負極活物質。 - 前記弾性高分子は、前記活物質コアの体積変化に連動してその面積が変化し、
前記導電材は、前記弾性高分子の面積変化によってねじれと伸びの挙動を示す、請求項1に記載の負極活物質。 - 前記弾性高分子は、ポリシロキサンエラストマー及び熱可塑性ポリエステルエラストマーよりなる群から選択された1種以上である、請求項1に記載の負極活物質。
- 前記導電材は、前記活物質コア100重量部を基準に0.05重量部から10重量部で含まれる、請求項1に記載の負極活物質。
- 前記弾性高分子は、前記負極活物質内に0.1重量%から20重量%で含まれる、請求項1に記載の負極活物質。
- 前記疎水性構造は、π電子共役(conjugate)構造の環及び炭素数3から20のアルキレン構造よりなる群から選択された1種以上を含む、請求項1に記載の負極活物質。
- 前記線状導電材は、炭素繊維、炭素ナノファイバー(CNF)、金属繊維、金属ナノチューブ、炭素ナノチューブ(CNT)及び導電性ウィスカーよりなる群から選択された1種以上であり、
前記面状導電材は、グラフェン、金属薄膜、及びマキシン(mxene)よりなる群から選択された1種以上である、請求項1に記載の負極活物質。 - 前記リチウムイオンが吸蔵及び放出され得る活物質コアは、Si、SiOx(0<x<2)、Sn、SnO2、及びSi-金属合金よりなる群から選択された1種以上である、請求項1に記載の負極活物質。
- (1)活物質コア粒子、導電材及び有機連結体(organic linker)を溶媒中で分散させ、前記導電材を前記活物質コア粒子の表面に位置させる段階と、
(2)前記段階(1)で得られた導電材が表面に位置する活物質コア粒子を高分子前駆体及び硬化剤と混合して撹拌する段階と、
(3)これを撹拌しながら前記高分子前駆体を硬化させて活物質コアの表面の少なくとも一部に弾性高分子を形成する段階とを含み、
前記導電材は、線状導電材、面状導電材又はこれらの全てを含み、
前記有機連結体は、疎水性構造及び極性官能基を含む置換基を含む化合物である、請求項1に記載の負極活物質の製造方法。 - 請求項1に記載の負極活物質を含むリチウム二次電池用負極。
- 請求項10に記載の負極を含むリチウム二次電池。
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