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Chuẩn bị vật liệu anot LiNi1/3Co1/3Mn1/3O2 phủ Fe2O3 với hiệu suất điện hóa cải thiện thông qua quá trình phân hủy nhiệt của citrat sắt
Tóm tắt
Vật liệu LiNi1/3Co1/3Mn1/3O2 (NCM111-Fe) được phủ lớp Fe2O3 đã được chế tạo thành công thông qua phản ứng kết tủa đồng thời được hỗ trợ bởi quá trình phân hủy nhiệt của citrat sắt. Cấu trúc tinh thể, hình thái và tình trạng nguyên tố của các mẫu đã được nghiên cứu bằng các phương pháp XRD, SEM, TEM và XPS. NCM111 được phủ lớp Fe2O3 sau quá trình phân hủy nhiệt của citrat sắt, và sự tồn tại của lớp Fe2O3 không làm thay đổi cấu trúc tinh thể nguyên bản của NCM111. Trong khoảng từ 3.0 đến 4.8 V, NCM111-Fe cung cấp dung lượng ban đầu là 192.5 mA h g−1 tại tốc độ 0.1 C và 86.7% dung lượng vẫn còn lại sau 100 chu kỳ. Ngược lại, NCM111 thể hiện dung lượng ban đầu là 187 mA h g−1 và chỉ còn lại 63.5% sau 100 chu kỳ. Kết quả cho thấy NCM111-Fe thể hiện độ phân cực yếu hơn, điện trở truyền tải điện nhỏ hơn và hiệu suất điện hóa tốt hơn so với mẫu nguyên bản.
Từ khóa
#LiNi1/3Co1/3Mn1/3O2 #Fe2O3 #hiệu suất điện hóa #citrat sắt #phân hủy nhiệt #vật liệu điện cựcTài liệu tham khảo
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