铝钴共掺杂锂锰氧化物的制备及吸附提锂性能

Preparation of Al-Co co-doped lithium manganese oxide and its adsorption performance of lithium

以电解二氧化锰和氯化锂为原料,掺杂少量氯化铝和氯化钴,采用水热工艺合成了Al-Co共掺杂锂离子筛前驱体Li_(1.6)(Mn_(1-x)Al_(x))_(1.6)Co_(y)O_(4)。经XRD、SEM、TEM表征及Li^(+)吸脱附性能测试,研究了Al-Co共掺杂锂离子筛的晶相、形貌、元素分布及吸附提锂性能。结果表明:Al-Co共掺杂锂离子筛为尖晶石结构;具有纳米片多面体形貌且元素分布均匀;Li^(+)溶液的初始质量浓度为100 mg/L时,H_(1.6)(Mn_(0.9)Al_(0.1))_(1.6)Co_(0.05)O_(4)的Li^(+)平衡吸附容量为38.53 mg/L,Li^(+)吸附性能得到明显提升;5次循环吸脱附实验后,Li^(+)吸附容量可保持为初始吸附容量的92%。综合分析可知,由于双元素的协同效应,Al-Co共掺杂可以使锂离子筛获得优异的吸附性能和循环稳定性。

Al-Co co-doped lithium ion sieves precursors Li_(1.6)(Mn_(1-x)Al_(x))_(1.6)Co_(y)O_(4) was synthesized by hydrothermal process using electrolytic manganese dioxide and lithium chloride as raw materials,doped with a small amount of aluminum chloride and cobalt chloride.The crystal phase,morphology,element distribution and lithium adsorption performance of Al-Co codoped lithium ion sieves were studied by XRD,SEM,TEM and Li^(+)adsorption and desorption property test.The results showed that Al-Co co-doped lithium ion sieve had spinel structure.A nanosheet polyhedral morphology and a uniform element distribution was obtained for the specimen.When the initial concentration for Li^(+)solution was 100 mg/L,the Li^(+)equilibrium adsorption capacity for H_(1.6)(Mn_(0.9)Al_(0.1))_(1.6)Co_(0.05)O_(4) was 38.53 mg/L and the Li^(+)adsorption performance was significantly improved.After 5 cycles of adsorption and desorption experiments,the Li^(+)adsorption capacity could be maintained at 92% of the initial adsorption capacity.Therefore,due to the synergistic effect of the two elements,Al-Co co-doping could make lithium ion sieves obtain excellent adsorption performance and cycling stability.