JP2023534339A - 電気化学装置及び電子装置 - Google Patents
電気化学装置及び電子装置 Download PDFInfo
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- JP2023534339A JP2023534339A JP2022554203A JP2022554203A JP2023534339A JP 2023534339 A JP2023534339 A JP 2023534339A JP 2022554203 A JP2022554203 A JP 2022554203A JP 2022554203 A JP2022554203 A JP 2022554203A JP 2023534339 A JP2023534339 A JP 2023534339A
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- 238000000926 separation method Methods 0.000 description 1
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- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
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- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- 125000001889 triflyl group Chemical group FC(F)(F)S(*)(=O)=O 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、出願番号が202110662766.6であり、出願日が2021年06月15日であり、発明名称が「電気化学装置及び電子装置」である中国特許出願に基づいており、当該中国特許出願の優先権を主張し、当該中国特許出願の全内容を参照として本願明細書に組み込まれる。
本発明は、電気化学的エネルギー貯蔵分野、特に電気化学装置及び電子装置に関する。
実施例1
まず、電気化学装置を完全放電状態まで放電し、そして特定の温度(例えば、25℃)に設定し、電気化学装置の設計によって異なるレート、例えば1C、1.1C、1.2C…で通常の充電(定電流+定電圧)を行い、即ち、特定のレートで電池のカットオフ電圧まで充電した後、定電圧で0.05Cまで充電して充電を停止し、充電した後に0.2Cで完全放電し、上記充放電プロセスを10サイクル繰り返した。最後に、電気化学装置を満充電した後に解体し、負極極片がリチウムを析出するか否かを観察し、リチウムが析出しない(負極極片の表面に白斑がない)場合の最大電流は当該電池の最大非リチウム析出レート、つまりリチウム析出窓と定義された。
測定対象であるリチウムイオン電池を25℃で30分間静置し、0.5Cの定電流で電圧が定格電圧に達するまで充電し、続いて定電圧で充放電レートが0.05Cに達するまで充電した後に充電を停止した。充電が開始されてから充電が停止されるまでの時間が満充電時間としてカウントされた。
電池エネルギー密度:測定対象であるリチウムイオン電池を25℃で30分間静置し、0.5Cの定電流で電圧が定格電圧に達するまで充電し、続いて定電圧で充放電レートが0.05Cに達するまで充電した後に充電を停止し、且つ測定対象である電気化学装置を30分間放置した。その後、0.2Cで電池を3.0Vまで放電し、測定対象であるリチウムイオン電池を30分間放置した。最後に、放電容量を電池の実際の電池容量Cとした。測定されたリチウムイオン電池の長さと幅と高さをそれぞれLとWとHとし、電池の放電プラットフォーム電圧をVとした場合、電池のエネルギー密度VED=C×V/(L×W×H)であった。
Claims (10)
- 正極極片を含む電気化学装置であって、前記正極極片が
前記正極極片の幅方向に沿って、第1の領域、第2の領域、及び前記第1の領域と前記第2の領域との間に位置する第3の領域を含む正極集電体と、
前記第1の領域、前記第2の領域及び前記第3の領域にそれぞれ設けられた第1の部分、第2の部分、及び第3の部分を含む正極活物質層と、
前記第1の領域及び前記第2の領域にそれぞれ設けられた第4の部分及び第5の部分を含む正極コーティング層と、を含み、
前記第4の部分が前記第1の部分と前記第1の領域との間に位置し、或いは前記第1の部分が前記第4の部分と前記第1の領域との間に位置し、
前記第5の部分が前記第2の部分と前記第2の領域との間に位置し、或いは前記第2の部分が前記第5の部分と前記第2の領域との間に位置し、
前記第1の部分と前記第4の部分との組み合わせインピーダンスが前記第3の部分のインピーダンスよりも大きく、且つ前記第2の部分と前記第5の部分との組み合わせインピーダンスが前記第3の部分のインピーダンスよりも大きい、電気化学装置。 - 前記正極極片は、
前記第3の部分のインピーダンスに対する前記第4の部分と前記第1の部分との組み合わせインピーダンスの比が1.02~5であり、前記第3の部分のインピーダンスに対する前記第5の部分と前記第2の部分との組み合わせインピーダンスの比が1.02~5であることと、
前記正極活物質層の幅に対する前記第4の部分の幅の比が0.01~0.25であり、前記正極活物質層の幅に対する前記第5の部分の幅の比が0.01~0.25であることと、
前記第4の部分の厚さが、0.5μm超8μm未満であることと、
前記第5の部分の厚さが、0.5μm超8μm未満であることと、
前記第3の部分の厚さが、20μm超200μm未満であることのうち少なくとも一つを満たす、請求項1に記載の電気化学装置。 - 前記正極コーティング層は、導電性炭素及びセラミックのうち少なくとも一種と第1のバインダーとを含む、請求項1に記載の電気化学装置。
- 前記正極極片は、
前記正極コーティング層における前記第1のバインダーの質量含有量が20%超であることと、
前記第1のバインダーが、ポリフッ化ビニリデン、フッ化ビニリデン-フッ素化オレフィンの共重合体、ポリビニルピロリドン、ポリアクリロニトリル、ポリメチルアクリレート、ポリテトラフルオロエチレン、カルボキシメチルセルロースナトリウム、スチレンブタジエンゴム、ポリウレタン、フッ素化ゴム、及びポリビニルアルコールのうち少なくとも一種を含むことと、
前記導電性炭素が、導電性カーボンブラック、カーボンナノチューブ、導電性黒鉛、グラフェン、アセチレンブラック、及びナノ炭素繊維のうち少なくとも一種を含むことのうち少なくとも一つを満たす、請求項3に記載の電気化学装置。 - 前記第1の部分及び前記第4の部分の組み合わせた厚さが前記第3の部分の厚さと同じであり、前記第2の部分及び前記第5の部分の組み合わせた厚さが前記第3の部分の厚さと同じである、請求項1に記載の電気化学装置。
- 負極極片を含む電気化学装置であって、前記負極極片が
前記負極極片の幅方向に沿って、第1の領域、第2の領域、及び前記第1の領域と前記第2の領域との間に位置する第3の領域を含む負極集電体と、
前記第1の領域、前記第2の領域及び前記第3の領域にそれぞれ設けられた第1の部分、第2の部分、及び第3の部分を含む負極活物質層と、
負極コーティング層と、を含み、
前記負極コーティング層が前記第3の部分と前記第3の領域との間に位置し、或いは前記第3の部分が前記負極コーティング層と前記第3の領域との間に位置し、
前記負極コーティング層と前記第3の部分との組み合わせインピーダンスが前記第1の部分のインピーダンスよりも大きく、且つ前記第2の部分のインピーダンスよりも大きい、電気化学装置。 - 前記負極極片は、
前記負極コーティング層と前記第3の部分との組み合わせインピーダンスに対する前記第1の部分のインピーダンスの比が0.5~0.99であり、前記負極コーティング層と前記第3の部分との組み合わせインピーダンスに対する前記第2の部分のインピーダンスの比が0.5~0.99であることと、
前記負極活物質層の幅に対する前記負極コーティング層の幅の比が0.75~0.99であることと、
前記負極コーティング層の厚さが0.5μm超8μm未満であることと、
前記負極コーティング層が、導電性炭素及びセラミックのうち少なくとも一種と第1のバインダーとを含むことと、
前記第1の部分の厚さ及び前記第2の部分の厚さが、いずれも20μm超200μm未満であることのうち少なくとも一つを満たす、請求項6に記載の電気化学装置。 - 前記負極コーティング層は、導電性炭素及びセラミックのうち少なくとも一種と第2のバインダーとを含む、請求項7に記載の電気化学装置。
- 前記負極極片は、
前記負極コーティング層における前記第1のバインダーの質量含有量が20%超であることと、
前記第1のバインダーが、ポリフッ化ビニリデン、フッ化ビニリデン-フッ素化オレフィンの共重合体、ポリビニルピロリドン、ポリアクリロニトリル、ポリメチルアクリレート、ポリテトラフルオロエチレン、カルボキシメチルセルロースナトリウム、スチレンブタジエンゴム、ポリウレタン、フッ素化ゴム、及びポリビニルアルコールのうち少なくとも一種を含むことと、
前記導電性炭素が、導電性カーボンブラック、カーボンナノチューブ、導電性黒鉛、グラフェン、アセチレンブラック、及びナノ炭素繊維のうち少なくとも一種を含むことのうち少なくとも一つを満たす、請求項8に記載の電気化学装置。 - 請求項1~9のいずれか一項に記載の電気化学装置を含む電子装置。
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