(1. 東北大學(xué) 材料與冶金學(xué)院, 沈陽 110004;
2. 遼寧石油化工大學(xué) 石油化工學(xué)院, 撫順 113001)
摘 要: 在高溫增加氧氣壓力的條件下，通過固態(tài)反應(yīng)合成了鋰離子電池正極材料LiNi1-yAlyO2。討論了合成條件對產(chǎn)物的電化學(xué)性能的影響，得到最佳的反應(yīng)條件是：2個恒溫階段的反應(yīng)時間為8h和10h；氧氣壓力為0.20MPa；反應(yīng)溫度800℃； 反應(yīng)物L(fēng)i，Ni，Al之間的摩爾比為1.1∶0.95∶0.05。 合成出具有晶型完整、電化學(xué)性能優(yōu)良的LiNi0.95Al0.05O2產(chǎn)品，其放電容量達(dá)182.3mA·h/g。 結(jié)果表明， Al3+的添加對LiNiO2的結(jié)構(gòu)及電化學(xué)性能有較大的改善。
關(guān)鍵字: 鋰離子電池； 正極材料； 氧氣壓力； 電化學(xué)性能
LiNi1-yAlyO2 as cathode
material in lithium ion battery
（1. School of Material and Metallurgy, Northeastern University,
Shenyang 110004, China;
2. School of Petroleum and Chemical Engineering,
Liaoning University of Petroleum and Chemical Technology,
Fushun 113001, China）
Abstract:LiNi1-yAlyO2 used as cathode material of lithium ion battery was prepared by solid reaction at high temperature under oxygen pressure. The influences of preparation conditions on electrochemical performances of the above product were discussed. The optimal reaction conditions were obtained, i.e. reactive time is 8h and 10h; oxygen pressure is 0.20MPa; reactive temperature is 800℃; and molar ratio between the reactants Li, Ni and Al is 1.1∶0.95∶0.05. The product of LiNi0.95Al0.05O2 was synthesized with the perfect crystal structure and the good electrochemical properties. Whose discharged capacity is up to 182.3mA·h/g. It is found that the addition of Al3+ greatly improves the structure and electrochemical properties of LiNiO2.
Key words: lithium ion battery; cathode material; oxygen pressure; electrochemical prop
