KR102460238B1 - 이차전지 양극 활물질용 복합체, 이를 포함하는 이차전지, 및 이의 제조방법 - Google Patents
이차전지 양극 활물질용 복합체, 이를 포함하는 이차전지, 및 이의 제조방법 Download PDFInfo
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- KR102460238B1 KR102460238B1 KR1020200167366A KR20200167366A KR102460238B1 KR 102460238 B1 KR102460238 B1 KR 102460238B1 KR 1020200167366 A KR1020200167366 A KR 1020200167366A KR 20200167366 A KR20200167366 A KR 20200167366A KR 102460238 B1 KR102460238 B1 KR 102460238B1
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- rgo
- active material
- rgo composite
- secondary battery
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 27
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- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
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- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
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Abstract
Description
도 1b는 본 발명의 일 구현예에 따른 NaCl/rGO 복합체에 대한 저배율(좌) 및 고배율(우)의 전계방출형 주사전자현미경(FE-SEM) 사진이다.
도 1c는 본 발명의 일 구현예에 따른 NaCl/rGO 복합체에 대한 저배율 TEM 사진(도 1c, 좌), 고배율(도 1c, 중) TEM 사진, SAED 분석 결과(도 1c, 우)이다.
도 1d는 동결건조 없이 후열처리하여 제조한 NaCl/rGO 복합체에 대한 주사전자현미경(Scanning Electron Microscope, SEM) 사진이다.
도 2는 GO, rGO, NaCl, 본 발명의 일 구현예에 따른 NaCl/rGO 복합체 각각의 X선 회절(XRD) 분석 결과이다.
도 3a는 GO 및 본 발명의 일 구현예에 따른 NaCl/rGO 복합체의 XPS 스펙트럼이고, 도 3b 및 3c는 각각 GO와 본 발명의 일 구현예에 따른 NaCl/rGO 복합체에 대한 X선 광전자 분광(XPS) 분석 결과이다.
도 4는 본 발명의 일 구현예에 따른 NaCl/rGO 복합체에 대한 열중량 분석 결과이다.
도 5는 본 발명의 일 구현예에 따른 NaCl/rGO 복합체 양극 활물질의 0.05 C-rate에서의 충전 및 방전 실험 결과를 나타낸 것이다.
도 6은 0.1-4.23 V (vs. Na/Na+) 전압 범위 및 0.05 C-rate 충방전 속도에서 본 발명의 일 구현예에 따른 NaCl/rGO 복합체 양극 활물질에 대한 수명 특성 결과이다.
Claims (17)
- 소듐 이차전지 양극 활물질용 NaCl-rGO 복합체로서,
상기 rGO는 환원 그래핀 옥사이드를 의미하고,
상기 NaCl 나노입자가 상기 rGO 상에 위치하여 있는 것을 특징으로 하는 소듐 이차전지 양극 활물질용 NaCl-rGO 복합체. - 제1항에 있어서,
상기 NaCl의 나노입자는 평균 입경이 100 내지 200 nm인 것을 특징으로 소듐 이차전지 양극 활물질용 NaCl-rGO 복합체. - 제1항에 있어서,
열중량 분석 결과,
상기 NaCl/rGO 복합체 내 NaCl의 로딩량이 85% 내지 95%인 것을 특징으로 소듐 이차전지 양극 활물질용 NaCl-rGO 복합체. - 제1항에 있어서,
상기 NaCl-rGO 복합체는 X선 회절(XRD) 분석 결과,
2θ가 10.1° 내지 10.5°에서는 유효 피크를 보이지 않고,
2θ가 24° 내지 26°에서 유효 피크를 보이는 것을 특징으로 소듐 이차전지 양극 활물질용 NaCl-rGO 복합체. - 제4항에 있어서,
상기 NaCl-rGO 복합체는 X선 회절(XRD) 분석 결과,
이차상이 전혀 관찰되지 않는 것을 특징으로 하는 소듐 이차전지 양극 활물질용 NaCl-rGO 복합체. - 제1항에 있어서,
상기 NaCl-rGO 복합체는 X선 광전자 분광(XPS) 분석 결과,
284.4-284.8 eV에서 제1 유효 피크를 보이고,
285.9-286.3 eV, 286.8-287.2 eV, 288.2-288.6 eV에서 각각 제2 유효 피크, 제3 유효 피크, 제4 유효 피크를 보이는 것을 특징으로 하는 소듐 이차전지 양극 활물질용 NaCl-rGO 복합체. - 제1항 내지 제6항 중에 어느 한 항에 따른 NaCl-rGO 복합체를 포함하는 소듐 이차전지용 양극 활물질.
- 제7항에 따른 양극 활물질을 포함하는 소듐 이차전지.
- 제8항에 따른 소듐 이차전지를 포함하는 장치로서,
상기 장치는 에너지 저장 장치, 운송 장치, 통신 장치 중에서 선택되는 것을 특징으로 하는 장치. - 하기 단계를 포함하는 것을 특징으로 하는 NaCl-rGO 복합체 제조방법:
(B) 그래핀 옥사이드, NaCl, 환원제가 포함된 혼합 용액에 대해 열처리하는 단계,
(C) 상기 혼합 용액의 용매 또는 분산매를 증발시켜 3차원 구조의 겔을 수득하는 단계,
(D) 상기 겔을 동결건조시키는 단계,
(E) 상기 동결건조된 겔에 대해 후열처리하는 단계. - 제10항에 있어서,
상기 (B) 단계 전에,
(A) 그래핀 옥사이드의 분산액과 NaCl 및 환원제가 포함된 용액을 혼합하여 상기 (B) 단계의 혼합 용액을 수득하는 단계를 추가로 포함하는 것을 특징으로 하는 NaCl-rGO 복합체 제조방법. - 제11항에 있어서,
상기 분산액은 수분산액이고,
상기 용액은 수용액이며,
상기 용매와 상기 분산매는 물인 것을 특징으로 하는 NaCl-rGO 복합체 제조방법. - 제12항에 있어서,
상기 그래핀 옥사이드와 상기 NaCl은 혼합 중량비가 1 : 10-15인 것을 특징으로 NaCl-rGO 복합체 제조방법. - 제13항에 있어서,
상기 열처리는 70-90 ℃에서 10-14 시간 동안 수행되는 것을 특징으로 하는 NaCl-rGO 복합체 제조방법. - 제14항에 있어서,
상기 동결건조는 -100℃ 내지 -10℃의 온도에서 수행되는 것을 특징으로 하는 NaCl-rGO 복합체 제조방법. - 제15항에 있어서,
상기 동결건조는 -60℃ 내지 -40℃에서 수행되는 것을 특징으로 하는 NaCl-rGO 복합체 제조방법. - 제16항에 있어서,
상기 후열처리는 비활성 분위기 및 650-750 ℃에서 0.5-4 시간 동안 수행되는 것을 특징으로 하는 NaCl-rGO 복합체 제조방법.
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