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首页> 外文期刊>RSC Advances >Sol-gel synthesis of low carbon content and low surface area Li4Ti5O12/carbon black composites as high-rate anode materials for lithium ion batteries
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Sol-gel synthesis of low carbon content and low surface area Li4Ti5O12/carbon black composites as high-rate anode materials for lithium ion batteries

机译：低碳含量和低表面积Li4Ti5O12 /炭黑复合材料的溶胶-凝胶合成作为锂离子电池的高倍率负极材料

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摘要

Li4Ti5O12/carbon black composite anode materials (LTO/CB) with various amounts of carbon black (CB) as an extra carbon source are synthesized by the sol-gel method. The SEM images show that micron-sized clusters are formed by Li4Ti5O12 nanoparticles with diameters of 5-15 nm. The N-2 absorption/desorption measurements indicate that the total pore volume and pore size of LTO/CB with only 3.04 wt% carbon content (LTO/CB-2) are significantly increased, improving the electrochemical properties, and the surface area is only 3.64 m(2) g(-1), benefiting the electrode processing. The discharge capacities of the LTO/CB-2 electrode in the voltage range of 1-2.5 V at 1, 2 and 5C rates are 221, 200 and 156 mA h g(-1), respectively and, even after 150 cycles, it retains 214 mA h g(-1) at 1C. Moreover, for the coin full-cell tests, the discharge capacities for the (LTO/CB-2)/LiFePO4 battery at 0.2, 0.5 and 1C are 152, 149 and 133 mA h g(-1), respectively. These are the highest capacities at the rate of 0.2-5C among the carbon-containing LTO electrodes with low surface areas for half-cells reported up to now, indicating that LTO/CB-2 is a promising high-rate anode material for use in high-power lithium ion batteries.
机译：通过溶胶-凝胶法合成了以各种炭黑（CB）作为额外碳源的Li4Ti5O12 /炭黑复合负极材料（LTO / CB）。 SEM图像表明，由直径为5-15nm的Li 4 Ti 5 O 12纳米颗粒形成微米级的团簇。 N-2吸收/解吸测量结果表明，碳含量仅为3.04 wt％（LTO / CB-2）的LTO / CB的总孔体积和孔径显着增加，改善了电化学性能，表面积仅为3.64 m（2）g（-1），有利于电极加工。 LTO / CB-2电极在1-2.5 V电压范围内（1、2和5C速率）的放电容量分别为221、200和156 mA hg（-1），即使经过150次循环，它仍能保持在1C时为214 mA hg（-1）。此外，对于硬币全电池测试，（LTO / CB-2）/ LiFePO4电池在0.2、0.5和1C时的放电容量分别为152、149和133 mA h g（-1）。这些是迄今为止报道的半电池低表面积含碳LTO电极中以0.2-5C的速率的最高容量，这表明LTO / CB-2是一种有前途的高速率阳极材料，可用于大功率锂离子电池。

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