JP7144629B2 - 断熱層を有するシングルセル用ケース - Google Patents
断熱層を有するシングルセル用ケース Download PDFInfo
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- JP7144629B2 JP7144629B2 JP2021569024A JP2021569024A JP7144629B2 JP 7144629 B2 JP7144629 B2 JP 7144629B2 JP 2021569024 A JP2021569024 A JP 2021569024A JP 2021569024 A JP2021569024 A JP 2021569024A JP 7144629 B2 JP7144629 B2 JP 7144629B2
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Description
(1)エアロゾルを形成するための前駆体の安定した溶液(溶液は、上記の前駆体、任意に乳白剤及びバインダーを含む安定した溶液であってもよい)を調製する工程、
(2)例えば、NaOH又はKOH等のアルカリ溶液を用いて、上記溶液のpHを3~4に変更することによって、重縮合反応を経て上記溶液をゲル化させる工程、
(3)工程(2)で得られたゾルを所定の温度で熟成させる工程、及び
(4)上記熟成したゲルを超臨界条件下で超臨界乾燥させて、所望の形態や形状に成形する工程、
を含む方法で形成できる。
試料1
SiO 2 /TiO 2 エアロゲルの調製
SiO2/TiO2エアロゲルを、以下の工程(1)~(4)により調製した。
(1)まず、秤量した4gのNa4SiO4(シグマアルドリッチ製)及び3gのナノサイズのNa2Ti3O7(シグマアルドリッチ製)を蒸留水100mlに加えてよく撹拌して、Na4SiO4及びNa2Ti3O7を含む安定な水溶液を調製した。
(2)アルカリ性溶液(1M KOH、シグマアルドリッチ製)を上記安定な溶液にゆっくりと添加し、上記安定な溶液のpHを3.5に調整してSiO2/TiO2ゾルを形成した
(3)得られたSiO2/TiO2ゾルを水中で10時間熟成してゲルを形成した。
(4)熟成したゲルを、超臨界CO2媒体中で、50℃の超臨界温度で2時間インキュベートしてSiO2/TiO2エアロゲルを形成した。
エアロゲルがSiO2/TiO2を63重量%、SiCを34重量%、ガラス繊維を3重量%含有すること以外は試料1と同様にして、SiO2/TiO2エアロゲルを調製した。
得られたエアロゲル(試料1及び試料2)について、ASTM C356及び専用の社内技術に準じて収縮率を測定した。この「完全浸漬(full soak)」させる方法では、試験材料を完全に浸漬し、それぞれ24時間で100℃、600℃、900℃まで加熱した後、寸法変化を測定する。試料1及び試料2の結果を表1に示す。
ケースとしてアルミラミネートフィルム(SPALF、昭和電工製、外側から内側に向かって、ナイロン、接着剤:25μm、アルミ箔:4μm、接着剤:40μm、CPP:4μm、30μmの構造を有する)のみを有するパウチセル(250Wh/kg、550Wh/L)を強制的に熱暴走させた。熱暴走時におけるアルミラミネートフィルムの挙動を観察した。
試料1と同様にしてSiO2/TiO2エアロゲルを調製した。すなわち、上記SiO2/TiO2エアロゲルは、SiO2/TiO2を72重量%、SiCを25重量%、ガラス繊維を3重量%含有する。得られたSiO2/TiO2エアロゲルの厚さは0.3mmであった。
SiO2/TiO2エアロゲルを厚さ0.5mmにしたこと以外は実施例1に記載の方法と同様にして、二層構造のコーティングを作製した。
比較例1で作製したシングルセルを用いる。図3は、パウチセルを含む試験用セルパックの構造を模式的に示す斜視図である。図3に示すように、四つのパウチセル(250Wh/kg、550Wh/L)を有するセルパック300を試験体として用いた。図3において、セル1、セル2、セル3、及びセル4は、310、320、330、及び340で示し、それぞれ平行に配置する。隣接するパウチセル間にスペーサは配置しない。
実施例1に記載の方法で二層構造のコーティングを作製した。図1に示すように、パウチセル(250Wh/kg、550Wh/L)の内面を、得られた二層構造のコーティングで被覆してパウチセル用複合ケースを得た。
SiO2/TiO2エアロゲルを厚さ0.5mmにしたこと以外は実施例1に記載の方法と同様にして、二層構造のコーティングを作製した。
アルミケースのみをケースとするプリズムセル(230Wh/kg、560Wh/L)を強制的に熱暴走させた。熱暴走時におけるアルミケースの挙動を観察した。上記プリズムセルは、長さが148mm、幅が91mm、厚さが26.5mmであり、1M LiPF6のEC:DEC(3:7)混合溶媒の電解液を含む。比較例3の結果を表4に示す。
実施例1に記載の方法で二層構造のコーティングを作製した。図2に示すように、プリズムセル(230Wh/kg、560Wh/L)の内面を、得られた二層構造のコーティングで被覆してプリズムセル用複合ケースを得た。上記プリズムセルは、長さが148mm、幅が91mm、厚さが26.5mmであり、1M LiPF6のEC:DEC(3:7)混合溶媒の電解液を含む。
SiO2/TiO2エアロゲルを厚さ0.5mmにしたこと以外は実施例1に記載の方法と同様にして、二層構造のコーティングを作製した。
比較例3で作製したシングルセルを用いる。図4は、プリズムセルを含む試験用セルパックの構造を模式的に示す斜視図である。図4に示すように、四つのプリズムセル(230Wh/kg、560Wh/L)を有するセルパック300を試験体として用いた。図4において、セル1、セル2、セル3、及びセル4は、410、420、430、及び440で示し、それぞれ平行に配置する。隣接するプリズムセル間にスペーサは配置しない。
実施例1に記載の方法で二層構造のコーティングを作製した。図2に示すように、プリズムセル(230Wh/kg、560Wh/L)の内面を、接着層を介して、得られた二層構造のコーティングで被覆してプリズムセル用複合ケースを得た。上記プリズムセルは、長さが148mm、幅が91mm、厚さが26.5mmであり、1M LiPF6のEC:DEC(3:7)混合溶媒の電解液を含む。
SiO2/TiO2エアロゲルを厚さ0.5mmにしたこと以外は実施例1に記載の方法と同様にして、二層構造のコーティングを作製した。
Claims (14)
- 基板と、前記基板上の二層構造のコーティングとを含む、断熱層を有するシングルセル用ケースであって、
前記二層構造のコーティングは、
前記基板の近位にあり、かつ、熱伝導率が25mW/m・K以下のエアロゲル材料を含む中間層と、
前記基板の遠位にあり、前記中間層を被覆し、かつ、電解液溶媒の前記中間層への浸透を防止できるバリア材料を含む外層とを含み、
前記バリア材料がバリア性ポリマーである、
断熱層を有するシングルセル用ケース。 - 前記中間層の厚さが300μm以上である、請求項1に記載の断熱層を有するシングルセル用ケース。
- 前記外層の厚さが100nm~500μmである、請求項1又は2に記載の断熱層を有するシングルセル用ケース。
- 前記バリア性ポリマーは、ポリエチレンテレフタレート(PET)、又はポリテトラフルオロエチレン(PTFE)である、請求項1~3のいずれか1項に記載の断熱層を有するシングルセル用ケース。
- 前記エアロゲル材料は、乳白剤と、バインダーとを含む、請求項1~4のいずれか1項に記載の断熱層を有するシングルセル用ケース。
- 前記乳白剤が、SiC、TiO 2 、又はカーボンブラックである、請求項5に記載の断熱層を有するシングルセル用ケース。
- 前記バインダーが、ガラス繊維である、請求項5に記載の断熱層を有するシングルセル用ケース。
- 前記エアロゲル材料は、900℃で24時間加熱後の収縮率が2%未満である、請求項1~7のいずれか1項に記載の断熱層を有するシングルセル用ケース。
- 前記基板は、硬質金属材料又は軟質材料である、請求項1~8のいずれか1項に記載の断熱層を有するシングルセル用ケース。
- 前記硬質金属材料はアルミニウム又はその合金である、請求項9に記載の断熱層を有するシングルセル用ケース。
- 前記軟質材料はアルミラミネートフィルムである、請求項9に記載の断熱層を有するシングルセル用ケース。
- 正極と、
負極と、
前記正極と前記負極との間のセパレータと、
電解液とを含むジェリーロールと、
前記ジェリーロールを収容する請求項1~11のいずれか1項に記載の断熱層を有するシングルセル用ケースとを含むシングルセル。 - パウチセル又はプリズムセルである、請求項12に記載のシングルセル。
- 複数の請求項12又は13に記載のシングルセルを含むセルパック。
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