Achieving High Lithium Storage Capacity and Long-Term Cyclability of Novel Cobalt Germanate Hydroxide/Reduced Graphene Oxide Anodes with Regulated Electrochemical Catalytic Conversion Process of Hydroxyl Groups

ACS Applied Materials & Interfaces
Ya-Qiong JingZhong-Zhen Yu

Abstract

To develop ternary transition-metal germanate anodes with superior lithium storage performances for lithium-ion batteries, a novel capacity counterbalance approach in one compound is designed by introducing an electrocatalytic conversion-type component with a positive cycling trend to compensate the negative cycling trend of the GeO2 component. Novel cobalt germanate hydroxide (CGH) nanoplates chemically bonded on reduced graphene oxide (RGO) sheets are thus synthesized with a mild one-pot hydrothermal approach, constructing maximal face-to-face contact interfaces with interfacial bonds to boost the electrochemical conversion reactions. Furthermore, the hydroxyl groups (Co-OH) of CGH nanoplates are regulated by thermal annealing treatments, thus controlling the capacity contribution resulting from the electrocatalytic conversion reaction of LiOH to exactly offset the capacity fading of GeO2. The results on the CGH electrodes at different cycling potentials confirm the stepwise electrochemical reactions of Co, GeO2, and LiOH. The equilibrium of these electrochemical reactions ensures a stable cycling capacity without obvious fluctuations. Consequently, the optimal CGH/RGO hybrid anode delivers a reversible capacity as high as 11...Continue Reading

References

Oct 6, 2005·Journal of the American Chemical Society·Zhaoping LiuTakayoshi Sasaki
Dec 22, 2007·Nano Letters·Candace K ChanYi Cui
Mar 21, 2017·Journal of Colloid and Interface Science·Yuvaraj SubramanianKalai Selvan Ramakrishnan
Feb 27, 2018·ACS Nano·Hyunchul KimWon-Sub Yoon
Aug 24, 2018·ACS Applied Materials & Interfaces·Zhe XuZhigang Zou
Nov 17, 2016·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Dai-Huo LiuQingyu Yan

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