Electrochemical intercalation performances of new cathode materials——Manganese nodule for lithium ion rechargeable batteries
- 化学化工－已发表论文 
研究了天然锰结核作为锂离子蓄电池阴极材料的可行性 ,从其组成结构与电化学嵌锂行为作了广泛全面的研究和评价。研究结果表明 ,锰结核的电化学性质是由钡镁锰矿和水羟锰矿加和的结果 ;锰结核的锂离子嵌入脱出电位在 2 .6V和 3V附近 ,在 2 .5～ 4.1V之间充放电 2 0 0多次后 ,放电容量降至约 10 1mA/ g ,保持率为 92 .5 % ,具有较好的充放电可逆性能 ,表明层状结构的钠水锰矿和水羟锰矿是一种良好的锂离子嵌入脱出电极材料 ,它是一种具有应用前景的新型锂电池和锂离子电池阴极材料。A comprehensive research and evaluation for manganese nodule as cathode material for lithium ion batteries was made. The composition, structure and micro-morphology, the electrochemical properties and the optimization of its charge/discharge performance were studied. The interstitial multi-metallic cations in tunnels and interlayers, such as Mg 2+ ,Ni 2+ ,Co 2+ ,Ca 2+ ,Cu 2+ ,etc.,and the lattice water contributed to equalization of chemical valence and structural stabilization of manganese nodule.The results show that the electrochemical properties of manganese nodule are attributed to Todorokite and Vernadite. In a appropriate electrolyte, such as LiClO 4/PC+DME, and the electrolyte of avoiding over-intercalating, the lattice water may not be harmful to the electrochemical performance. The Li insertion and extraction potentials of manganese nodule are about 2.6 V and 3 V, respectively. The cyclic voltammetry curves show that the broad current peaks reflect the characteristics of amorphous state of manganese nodule. Manganese nodule shows a good reversible discharge capacity (101 mAh·g -1 , 85% of the highest discharge capacity) at about 2.5-4.1 V after more than 200 cycles in 1mol/L LiClO 4/PC+DME. It is proved that manganese nodule is a promising novel natural cathode material for lithium ion batteries.