New Insights for the Cyclic Performance of Li/MnO2 Batteries Using a Simple Electrochemical Process
New Insights for the Cyclic Performance of Li/MnO2 Batteries Using a Simple Electrochemical Process
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DOI：
10.1149/2.0781503jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
Haibo Tan;Shengping Wang;Xinrong Lei
中科院分区：
文献类型：
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作者：
Haibo Tan;Shengping Wang;Xinrong Lei
在研究热处理电解二氧化锰（HEMD）在锂二次电池中的循环性能时，发现了许多重大问题。研究证实，HEMD具有较差的可逆性，因为在第一次放电/充电过程后发生了显著的不可逆相变。从本质上讲，所有的详细工作都集中在这个新相上，研究它的电化学行为和相演化。值得注意的是，由此产生的新相（尖晶石相关相）显示出完美的循环性能和稳定性。在0.1 mA cm - 2的电流密度下，稳定的尖晶石相关相在2.4 ~ 3.6 V的电位范围内保持120 mAh g - 1的放电容量超过100次循环而没有容量损失。此外，目前的研究表明，尖晶石相关相是锂二次电池极有前景的正极材料，而锂二次电池在循环过程中结构崩溃是导致电池容量衰减和循环能力丧失的主要原因。
A number of significant issues were discovered when studying the cyclic performance of heat-treated electrolytic manganese dioxide (HEMD) in lithium secondary batteries. The investigations verified that HEMD has poor reversible behavior due to the significant irreversible phase conversion that occurs after the first discharging/charging process. Essentially, all detailed work was focused on this new phase to investigate its electrochemical behavior and phase evolution. Notably, the resultant new phase (spinel-related phase) revealed faultless cycling performance and stability. The stable spinel-related phase maintained the discharge capacity of 120 mAh g− 1 for over 100 cycles without capacity loss between potential limits of 2.4 and 3.6 V at a current density of 0.1 mA cm− 2. In addition, the present studies demonstrated that the spinel-related phase is a promising cathode material for lithium secondary batteries, where the structure collapse during cycles is the primary reason for fading capacity and loss of cycling ability.