(1. 中南大學 化學化工學院, 長沙 410083； 2. 蘇州大學 鋼鐵學院, 蘇州 215021； 3. 上海杉杉科技有限公司, 上海 201209)
摘 要: 以LiOH·H2O、Mn(CH3COO)2·4H2O和H3BO3為原料，聚乙二醇6000(PEG-6000)為碳源，采用噴霧干燥法合成LiMnBO3和LiMnBO3/C正極材料。XRD測試表明，兩種樣品均為單一的六方晶體結(jié)構(gòu)LiMnBO3(h-LiMnBO3)；電化學測試表明，在電壓范圍1.0~4.8 V內(nèi)，LiMnBO3在0.5C倍率下的首次放電比容量為63.28 mA？h/g，而LiMnBO3/C的首次放電比容量高達135.21 mA？h/g；循環(huán)50次后，兩者比容量分別為31.15 mA？h/g和109.69 mA？h/g。碳源的加入有效地提升了LiMnBO3的電化學性能。
關(guān)鍵字: 正極材料；硼酸錳鋰；噴霧干燥；碳包覆
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. School of Iron and Steel, Soochow University, Suzhou 215021, China; 3. Shanghai Shanshan Technology Co., Ltd., Shanghai 201209, China）
Abstract:LiMnBO3 and its carbon coated material LiMnBO3/C were synthesized via spray-drying method using LiOH·H2O, Mn(CH3COO)2·4H2O and H3BO3, as starting materials and polyethylene glycol 6000 (PEG-6000) as carbon resource. XRD results indicate that the samples have hexagonal crystal structure (h-LiMnBO3). The electrochemical tests show that the LiMnBO3/C particles delivers a high first discharge capacity of 135.21 mA？h/g at 0.5C rate within 1.0-4.80 V and retaining a discharge capacity of 109.69 mA？h/g after 50 cycles, while the LiMnBO3 composite displays a first discharge capacity of 63.28 mA？h/g and a capacity remaining of 31.15 mA？h/g after 50 cycles. The carbon-coated LiMnBO3 could effectively improve the electrochemical performance.
Key words: cathode material; LiMnBO3; spray-drying; carbon-coated
