Fabrication and performance of Li4Ti5O12/C Li-ion battery electrodes using combined double flame spray pyrolysis and pressure-based lamination technique
Fabrication and performance of Li4Ti5O12/C Li-ion battery electrodes using combined double flame spray pyrolysis and pressure-based lamination technique
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DOI：
10.1016/j.jpowsour.2017.11.016
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发表时间：
2018-01-15
影响因子：
9.2
通讯作者：
Kun, Robert
中科院分区：
文献类型：
--
作者：
Gockeln, Michael;Pokhrel, Suman;Kun, Robert
降低锂离子电池（LIB）生产成本是不可避免的，以使LIB技术在电动汽车或固定存储等应用中的使用更加可行。为了满足当今LIB成本效率的要求，我们目前的研究集中在一种替代电极制造方法上，其特征在于双火焰喷雾热解和层压技术（DFSP/层压）的组合。采用多功能DFSP法原位合成碳包覆纳米Li 4 Ti 5 O 12（LTO/C）。然后将所制备的复合材料粉末直接层压到导电基底上，避免使用任何溶剂或粘合剂用于电极制备。研究了压层压力对电极微观结构和电化学性能的影响。增强本征电导率被发现为更高的层压压力。最高加压的DFSP/层压制备的电极在1C（相对于Li）下200次放电/充电循环后的容量保持率为87.4%。此外，还将双火焰喷雾热解法制备的LTO/C材料用于刮涂法制备电极。由于上级微结构特性，与压延和非压延叶片铸造电极相比，层压电极获得更高的放电比容量。这种快速和工业上引人注目的集成DFSP/层压工具可能是用于低成本LIB电极制造的繁荣的下一代技术。
Reduction of lithium-ion battery (LIB) production costs is inevitable to make the use of LIB technology more viable for applications such as electric vehicles or stationary storage. To meet the requirements in today's LIB cost efficiency, our current research focuses on an alternative electrode fabrication method, characterized by a combination of double flame spray pyrolysis and lamination technique (DFSP/lamination). In-situ carbon coated nano-Li4Ti5O12 (LTO/C) was synthesized using versatile DFSP. The as-prepared composite powder was then directly laminated onto a conductive substrate avoiding the use of any solvent or binder for electrode preparation. The influence of lamination pressures on the microstructure and electrochemical performance of the electrodes was also investigated. Enhancements in intrinsic electrical conductivity were found for higher lamination pressures. Capacity retention of highest pressurized DFSP/lamination-prepared electrode was 87.4% after 200 dis-/charge cycles at 1C (vs. Li). In addition, LTO/C material prepared from the double flame spray pyrolysis was also used for fabricating electrodes via doctor blading technique. Laminated electrodes obtained higher specific discharge capacities compared to calendered and non-calendered blade-casted electrodes due to superior microstructural properties. Such a fast and industrially compelling integrative DFSP/lamination tool could be a prosperous, next generation technology for low-cost LIB electrode fabrication.