固相法制备锂离子电池正极材料LiMn_(1/3)Ni_(1/3)Co_(1/3)O_2

Cathode material LiMn_(1/3)Ni_(1/3)Co_(1/3)O_2 for lithium ion battery prepared by solid state method

通过选取与氧化钴粒度接近的氧化锰、氧化镍为原料,采用固相法合成出锂离子电池正极材料LiMn1/3Ni1/3Co1/3O2(LMNC)。对合成产物用X射线衍射仪(XRD)、扫描电镜(SEM)等手段进行了表征,并加工成053048电池测试了电化学性能。结果发现,在n(Li)/n(M)=1.05～1.10,900～1000℃煅烧20h,可得到具有!-NaFeO2型层状晶体结构的LMNC纯相。当n(Li)/n(M)=1.10时,过量的碳酸锂使固相反应进行得更彻底,且抑制了产物晶体结构中的"阳离子混排",提高了材料的结构稳定性。本研究产物具有良好的物理指标和电化学性能,表明固相法是一条制备LMNC材料的可行途径。

The cathode material LiMn1/3Nil/3Co1/3O2 （LMNC） for lithium ion battery was synthesized from the grain-size-closed raw materials of manganese oxide, nickel oxide and cobalt oxide by solid state method. The products were characterized by XRD and SEM, and were fabricated into 053048 type battery for electrochemical tests. The results show that the pure LMNC phase with e-NaFeO2 layer structure is obtained by calcining the mixed raw materials with n（Li）/n（M）=1.05--1.10 at 900--1 000℃ for 20 h. When n（Li）/n（M）=1.10, excessive lithium carbonate facilitates the solid state reaction, suppresses the cation-disorder in the product crystal structure, and thus improves the stability of the material. The products exhibited good physical and electrochemical properties, which proved that solid state method is a feasible method for preparing LMNC.