Abstract
The key and difficulty to improve the performance of Li-ion battery (LIBs) is to explore new and high-performance anode materials. Polyanionic tungstate anode materials present good lithium ion storage performance due to their structural advantages. A new tungstate anode material Li2Ni(WO4)2/C is first investigated at a voltage window of 0.5–3.0 V. Li2Ni(WO4)2/C delivers a high specific capacity of 325 mAh g-1@20 mA g-1 with multi electronic reaction of W6+ and Ni2+. Carbon coating improves the electronic conductivity, reduces the particle size and increases the specific surface area. Moreover, Li2Ni(WO4)2 has a stable three-dimensional framework structure. Therefore, Li2Ni(WO4)2/C presents moderate cycle stability (capacity remains 86% after 500 cycles at 2 A g-1) and rate performance (99 mAh g-1 at 2 A g-1). This work provides a potential anode material and a new exploration direction for the material design of high-performance LIBs.
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