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Một phương pháp đơn giản để chuẩn bị bông phủ graphene và ứng dụng của nó cho pin lithium
Tóm tắt
Các vật liệu điện cực tự đứng và không cần chất kết dính, composites bông/graphene (CGN) đã được chế tạo thông qua quy trình "nhúng và sấy đông" đơn giản, sử dụng bông thô làm thân hỗ trợ và graphene oxide (GO) làm dung dịch huyền phù. Sau đó, các composites bông/GO (CGO) được tôi ở 1000 °C dưới điều kiện khí Ar để thu được composites CGN. Kết quả cho thấy cấu trúc CGN có thể bảo vệ khung bông và có tính ổn định nhiệt tốt hơn so với bông đơn thuần. Các thí nghiệm sạc-xả tĩnh điện đã chứng minh rằng nồng độ GO có ảnh hưởng lớn đến hiệu suất điện hóa của chúng. CGN (đối với GO với 3 và 5 mg ml−1) cung cấp khả năng xả lặp lại là 160 mAh g−1 sau 100 chu kỳ, cao hơn khoảng 1.5 lần so với bông đơn thuần (115 mAh g−1 sau 100 chu kỳ). Các đặc tính điện hóa xuất sắc của CGN có thể được liên kết với cấu trúc có thể kiểm soát với nhiều vị trí lưu trữ ion lithium hơn, độ dẫn điện cao và tốc độ khuếch tán ion nhanh. Kết quả này gợi ý rằng công trình này phát triển một phương pháp sản xuất quy mô lớn đơn giản, rẻ tiền và phù hợp cho pin lithium-ion.
Từ khóa
#bông #graphene #composites #pin lithium-ion #hiệu suất điện hóaTài liệu tham khảo
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