微米级单晶高电压LiNi_(0.5)Mn_(1.5)O_(4)材料的制备及性能  

Preparation and Properties of Micron Single Crystal High⁃Voltage LiNi_(0.5)Mn_(1.5)O_(4) Material

作　　者：罗英[1] 丁赵波 刘雯[1] 晏莉琴[1] 闵凡奇 解晶莹[1] 路杰 LUO Ying;DING Zhao-Bo;LIU Wen;YAN Li-Qin;MIN Fan-Qi;XIE Jing-Ying;LU Jie(State Key Laboratory of Space Power-Sources Technology,Shanghai Institute of Space Power-Sources,Shanghai 200245,China;Shanghai Power&Energy Storage Battery System Engineering Technology Co.,Ltd.,Shanghai 200241,China;Guizhou Best New Energy Materials Co.,Ltd.,Guizhou 554000,China)

机构地区：[1]上海空间电源研究所,空间电源技术国家重点实验室,上海200245 [2]上海动力储能电池系统工程技术有限公司,上海200241 [3]贵州百思特新能源材料有限公司,贵州554000

出　　处：《无机化学学报》2022年第4期611-619,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金项目(No.21805186);上海市青年科技启明星计划(No.20QB1401700);上海市优秀技术带头人计划(No.20XD1430800);上海市科委项目(No.18DZ2284000)资助。

摘　　要：采用改进的共沉淀-高温固相法制备了形貌可控的高电压LiNi_(0.5)Mn_(1.5)O_(4)料。利用锂盐中结晶水易脱水的特点设计了低温高压反应环境。在高温煅烧之前增加反应釜预反应过程,有效提高锂盐与氧化物前驱体的混合均匀性以及反应性,抑制了杂相生成,降低了材料金属离子混排度。调控预反应温度实现了LiNi_(0.5)Mn_(1.5)O_(4)材料形貌和颗粒尺寸的可控制备。研究表明,经过180℃预反应过程合成的样品具有规则的八面体单晶形貌,尺寸分布相对均匀,有效抑制了电极/电解液界面反应,使得合成的材料表现出优异的循环稳定性和倍率性能。常温1C下循环400次后容量保持率达到95.3%,且在20C下仍能放出120.9 mAh·g^(-1)的比容量。High⁃voltage LiNi_(0.5)Mn_(1.5_O_(4) materials with controllable morphology were prepared by an improved coprecipitation⁃high⁃temperature solid⁃phase method.A low⁃temperature and high⁃pressure reaction environment was designed based on the characteristics that lithium saltcontaining crystal water was easy to dehydrate.The pre⁃reaction process introduced before high⁃temperature calcination,can effectively improve the mixing uniformity and reactivity of lithium salt and oxide precursor,inhibiting the formation of impurity phase and reducing the mixing degree of metal ions.By adjusting the prereaction temperature,the morphology and particle size of LiNi_(0.5)Mn_(1.5_O_(4) materials were controllable.The results showed that the samples synthesized by the prereaction temperature of 180℃had a regular octahedral single crystal morphology and relatively uniform size distribution,which effectively inhibit the electrode/electrolyte interface reaction so that the synthesized materials showed excellent cycle stability and rate performance.Its capacity retention rate reached 95.3%after 400 cycles at 1C and room temperature,and the specific capacity of 120.9 mAh·g^(-1) could still be released at 20C.

关 键 词：锂离子电池 高电压LiNi_(0.5)Mn_(1.5)O_(4) 改进的共沉淀-高温固相法 循环稳定性 

分 类 号：TB321[一般工业技术—材料科学与工程] TQ152[化学工程—电化学工业]