CỰC ÂM NĂNG LƯỢNG CAO CHO PIN NATRI-ION DỰA TRÊN VẬT LIỆU NATRI MOLYBDAT

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Tác giả: Trung Sơn Lương, Quý Quyền Ngô, Văn Kỳ Nguyễn, Đình Thảo Vũ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Physics and Chemical Engineering, 2024

Mô tả vật lý: tr.56

Bộ sưu tập: Báo, Tạp chí

ID: 438950

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In this study, sodium molybdate (Na2MoO4) was synthesized by a conventional solid-state reaction method. Crystal structure and morphology of the Na2MoO4 material were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). The Na2MoO4 material was utilized to fabricate CR2032-type coin cells, and later evaluated for its electrochemical characteristic. The electrochemical characteristics of Na2MoO4 were evaluated through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charging-discharging at different current densities on a NEWARE battery testing system (BTS). The results of studying the electrochemical properties of Na2MoO4 material has shown that it has pretty good electrochemical properties. In particular, the Na2MoO4 electrode material has achieved an outstanding specific capacity of about 420 mAh.g-1 at 0.1 C within the voltage range from 0.2 to 2.2 V. The Na2MoO4 material exhibited a quite good cycling performance, it is able to remains up to 80% specific capacity over 50 cycles at the current density of 0.1 C. In addition, when charge/discharge at the high current density of 1 C, it has retained a specific capacity of about 240 mAh.g-1. The results suggest that the Na2MoO4 material is a promising anode for sodium-ion batteries.Trong nghiên cứu này, natri molybdat (Na2MoO4) được tổng hợp bằng phương pháp phản ứng ở trạng thái rắn. Cấu trúc tinh thể và hình thái của vật liệu natri molybdat (Na2MoO4) đã được nghiên cứu bằng phương pháp nhiễu xạ tia X (XRD), kính hiển vi điện tử quét (SEM) và quang phổ tia X phân tán năng lượng (EDS). Vật liệu Na2MoO4 được sử dụng để chế tạo pin đồng xu loại CR2032 và sau đó được đánh giá về các đặc tính điện hóa. Các đặc tính điện hóa của Na2MoO4 được đánh giá thông qua phép đo quyết thế vòng tuần hoàn (CV), phổ tổng trở điện hóa (EIS) và phóng-nạp ở các mật độ dòng điện khác nhau trên hệ thống kiểm tra pin NEWARE (BTS). Kết quả nghiên cứu tính chất điện hóa của vật liệu Na2MoO4 cho thấy nó có tính chất điện hóa khá tốt. Đặc biệt, vật liệu điện cực Na2MoO4 đã đạt được dung lượng riêng vượt trội vào khoảng 420 mAh.g-1 ở 0,1 C trong dải điện áp từ 0,2 đến 2,2 V. Vật liệu Na2MoO4 thể hiện hiệu suất chu kỳ khá tốt, có khả năng duy trì tới 80% dung lượng riêng trong 50 chu kỳ ở mật độ dòng điện là 0,1 C. Ngoài ra, khi sạc/xả ở mật độ dòng điện cao 1 C, Na2MoO4 giữ được dung lượng riêng khoảng 240 mAh.g-1. Kết quả cho thấy vật liệu Na2MoO4 là cực âm đầy hứa hẹn cho pin natri-ion.

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