A class of liquid anode for rechargeable batteries with ultralong cycle life.
A class of liquid anode for rechargeable batteries with ultralong cycle life.
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一类超长循环寿命充电电池液体负极
DOI：
10.1038/ncomms14629
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发表时间：
2017-03-06
影响因子：
16.6
通讯作者：
Chen L
中科院分区：
文献类型：
--
作者：
Yu J;Hu YS;Pan F;Zhang Z;Wang Q;Li H;Huang X;Chen L
低成本、高效率和安全的储能装置一直是我们社会所期望的。在这些装置中，具有碱金属阳极的电化学电池引起了全世界的关注。然而，这种系统的实际应用受到枝晶形成和碱金属的低循环效率的限制。在这里，我们报告了一类液体阳极制成的溶解金属钠到联苯和醚的混合溶液。这种液体阳极是高度安全的，并且具有相对于钠的0.09 V的低氧化还原电位，表现出1.2 × 10−2S cm−1的高电导率。当与溶解在二甲基亚砜中的多硫化物结合作为阴极时，电池被证明可以在室温下持续超过3，500次循环而没有可测量的容量损失。这项工作提供了一个基础，探索一个家庭的液体阳极的可充电电池，有可能满足电网规模的电能存储的要求。
Low cost, highly efficient and safe devices for energy storage have long been desired in our society. Among these devices, electrochemical batteries with alkali metal anodes have attracted worldwide attention. However, the practical application of such systems is limited by dendrite formation and low cycling efficiency of alkali metals. Here we report a class of liquid anodes fabricated by dissolving sodium metal into a mixed solution of biphenyl and ethers. Such liquid anodes are highly safe and have a low redox potential of 0.09 V versus sodium, exhibiting a high conductivity of 1.2 × 10−2S cm−1. When coupled with polysulfides dissolved in dimethyl sulfoxide as the cathode, a battery is demonstrated to sustain over 3,500 cycles without measureable capacity loss at room temperature. This work provides a base for exploring a family of liquid anodes for rechargeable batteries that potentially meet the requirements for grid-scale electrical energy storage.