Study on Modified High Voltage (5V) Spinel Lithium Manganate Used for Energy Storage Lithium Titanate Batteries
Study on Modified High Voltage (5V) Spinel Lithium Manganate Used for Energy Storage Lithium Titanate Batteries
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储能钛酸锂电池用改性高电压（5V）尖晶石锰酸锂的研究
DOI：
10.4028/www.scientific.net/ssp.310.58
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Siqin Bator
中科院分区：
文献类型：
--
作者：
Dan Wu;Wei Li;O. Tegus;Siqin Bator
采用固体电解质Li1.4Al0.4Ti1.6（PO 4）3包覆高压（5V）尖晶石锂电池。以改性后的尖晶石型锂离子电池为正极，钛酸锂为负极。组装了一种10Ah储能电池。在不同的温度和速率下进行了这些电池的充放电和循环寿命测试。结果表明，包覆高压尖晶石型锂离子电池提高了钛酸锂电池的高温循环性能。与未包覆的高压锰酸锂作正极材料的钛酸锂电池相比，包覆的高压锰酸锂作正极材料的钛酸锂电池在60° C下2000次循环后的容量保持率从74.8%提高到86.5%。但在-30 ℃时循环性能不受影响。通过涂覆高压锰酸锂来提高钛酸锂电池的低温倍率性能。在-30 °C、20 C放电倍率下，以包覆的高压锂离子电池为正极材料的钛酸锂电池在室温下的1C充电容量可达90.6%，而以未包覆的高压锂离子电池为正极材料的钛酸锂电池在室温下的1C充电容量仅为80.2%。
Solid electrolyte Li1.4Al0.4Ti1.6 (PO4)3 was used to coat high voltage (5V) spinel lithium manganate. The modified high voltage spinel lithium manganate was used as positive electrode and the lithium titanate as negative electrode. A type of 10Ah energy storage battery was assembled. Charge-discharge and cycle life tests of these batteries were carried out at different temperatures and rates. The results show that coating high voltage spinel lithium manganate improves the high temperature cycle performance of the lithium titanate batteries. The capacity retention ratio of the lithium titanate batteries with the coated high voltage lithium manganate as cathode material increases from 74.8% to 86.5% at 60°Cafter 2000 cycles compared to the lithium titanate batteries with the uncoated high voltage lithium manganite as cathode material. However, the cycle performance is not affected at-30 °C. The low temperature rate performance of lithium titanate batteries is improved by coating high voltage lithium manganate. When the discharge rate is 20 C at-30°C, 90.6% of the 1 C charge capacity at room temperature of the lithium titanate battery with the coated high voltage lithium manganate as cathode materialcan be delivered, while the lithium titanate battery with the un-coated high voltage lithium manganate as cathode material can only deliver 80.2% of the 1 C charge capacity at room temperature.
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