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Tính chất điện hóa của vật liệu catốt LiNi0.9Co0.1O2 được chuẩn bị bằng phương pháp đồng kết tủa sử dụng tác nhân chelat sinh thái
Tóm tắt
Trong nghiên cứu này, một tiền chất hình cầu Ni0.9Co0.1(OH)2 với kích thước hạt trung bình 4.2 μm đã được tổng hợp bằng phương pháp đồng kết tủa sử dụng axit citric làm tác nhân chelat thân thiện với môi trường. Vật liệu catốt dạng lớp LiNi0.9Co0.1O2 được chuẩn bị bằng cách gia nhiệt hỗn hợp tiền chất Ni0.9Co0.1(OH)2 và LiOH·H2O ở nhiệt độ từ 680 đến 740 °C trong môi trường oxy. Quá trình gia nhiệt tối ưu cho quá trình nung đã được nghiên cứu dựa trên nhiệt độ và thời gian phản ứng (nhiệt độ thấp: hạt sơ cấp nhỏ và khoảng cách bề mặt → hiệu suất hồi phục thấp; nhiệt độ cao: hạt sơ cấp lớn → hiệu suất tỉ lệ thấp; thời gian phản ứng ngắn: tính tinh thể thấp → hiệu suất hồi phục thấp; thời gian phản ứng dài: hạt sơ cấp lớn → hiệu suất tỉ lệ thấp). Vật liệu catốt LiNi0.9Co0.1O2 được gia nhiệt ở 700 °C cho thấy hiệu ứng trộn cation thấp nhất và tính tinh thể xuất sắc; vật liệu này thể hiện đặc tính nạp/xả ban đầu tuyệt vời nhưng hiệu suất tỉ lệ thấp. Vật liệu catốt được gia nhiệt ở 700 °C đã được chọn làm vật liệu để nung lại do các đặc tính xuất sắc của nó. Để khắc phục sự ổn định cấu trúc ở tỉ lệ cao, vật liệu catốt gia nhiệt ở 700 °C đã được nung lại ở 700 °C; vật liệu nung lại đạt được dung lượng xả ban đầu là 215.3 mAh/g. Độ ổn định dung lượng của vật liệu catốt nung lại (84.5% ở chu kỳ thứ 50) tốt hơn vật liệu catốt nguyên bản (76.0% ở chu kỳ thứ 50) nhờ sự ổn định cấu trúc tăng cường. Vật liệu catốt nung lại cũng thể hiện hiệu suất tỉ lệ xuất sắc (75.3% ở 6 C/0.1 C).
Từ khóa
#vật liệu catốt #LiNi0.9Co0.1O2 #đồng kết tủa #tác nhân chelat sinh thái #tính chất điện hóaTài liệu tham khảo
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