(中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 以化學(xué)共沉淀法制備的球形Ni1/3Co1/3Mn1/3CO3為前驅(qū)體合成了球形LiNi1/3Co1/3Mn1/3O2, 研究LiNi1/3Co1/3Mn1/3O2合成工藝對(duì)產(chǎn)物形貌的影響。結(jié)果表明： 直接以前驅(qū)體Ni1/3Co1/3Mn1/3CO3與Li2CO3反應(yīng)合成的LiNi1/3Co1/3Mn1/3O2的一次顆粒較大，以前驅(qū)體分解后的氧化物與Li2CO3反應(yīng)合成的LiNi1/3Co1/3Mn1/3O2的一次顆粒相對(duì)細(xì)小；合成的LiNi1/3Co1/3Mn1/3O2均為具有層狀結(jié)構(gòu)的純相物質(zhì)；球形正極材料LiNi1/3Co1/3Mn1/3O2充放電過程中存在一個(gè)材料活化的過程，在前10周期充放電時(shí)， 電池容量處于增加的狀態(tài)； 在2.7～4.3 V的電壓范圍內(nèi)1 C倍率下電池的放電比容量達(dá)到149 mA·h/g， 0.2 C倍率下為158 mA·h/g, 經(jīng)50次循環(huán)后容量無衰減。
關(guān)鍵字: 鋰離子電池； LiNi1/3Co1/3Mn1/3O2； 正極材料； 球形
spherical LiNi1/3Co1/3Mn1/3O2
GUO Hua-jun, PENG Wen-jie
（School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: Spherical LiNi1/3Co1/3Mn1/3O2 powders were synthesized from the coprecipitated carbonate precursor, Ni1/3Co1/3Mn1/3CO3. The effect of synthesis conditions on the morphology of LiNi1/3Co1/3Mn1/3O2 materials was studied. The results show that LiNi1/3Co1/3Mn1/3O2 synthesized directly from Ni1/3Co1/3Mn1/3CO3 and Li2CO3 has big primary particle size, while LiNi1/3Co1/3Mn1/3O2 synthesized from the oxide Ni1/3Co1/3Mn1/3CO3 and Li2CO3 is relatively small. All LiNi1/3Co1/3Mn1/3O2 particles are pure phase with layered structure. The spherical cathode material LiNi1/3Co1/3Mn1/3O2 has an activation process and the capacity of LiNi1/3Co1/3Mn1/3O2 increases during the preliminary 10 cycles. The spherical LiNi1/3Co1/3Mn1/3O2 delivers 149 and 158 mA·h/g at the rate of 1 C and 0.2 C and voltage range of 2.7-4.3 V. The material also shows excellent cycling performance that the capacity does not fade after 50 cycles at the rate of 0.2 C.
Key words: Li-ion battery; LiNi1/3Co1/3Mn1/3O2; cathode material; spherical
