Tin selenide (SnSe2) is an ideal anode in lithium-ion batteries (LIBs) owing to its high theoretical capacity and high conductivity for both electrons and ions. Herein, we design a unique heterostructure with 2D SnSe2 nanosheets supported on graphene, where the chemical coupling effect is formed between graphene and SnSe2, working as a cushion to buffer the volume change of electrodes. The 2D/2D SnSe2/graphene heterostructure has a reversible capacity of 490.9 mAh g^–1 at a current rate of 0.1 C, with an ultra-long cycling stability with capacity retention of 59.3% after 1500 cycles at 0.5 C, and can well work at temperatures from -30 to 70 °C. Ex situ X-ray diffraction reveals that the long-term capacity is ascribed to reversible reaction of generating LixSn with Sn and Li, and the capacity loss is attributed to the irreversible reaction with the appearance of Li2Se. The remarkable electrochemical performances, such as high specific capacity, acceptable rate feature, ultra-long cycling life, and wide temperature operation, make the SnSe2/grapheme heterostructure very potential for all-climate LIBs.

硒化锡（SnSe2）是锂离子电池（LIB）的理想阳极，因为它具有很高的理论容量和对电子和离子的高导电性。在本文中，我们设计了一种独特的异质结构，其中二维石墨烯支撑着二维SnSe2纳米片，其中石墨烯与SnSe2之间形成了化学偶联效应，起到缓冲电极体积变化的缓冲作用。2D / 2D SnSe2 /石墨烯异质结构的可逆容量为490.9 mAh g ^–1在0.1 C的电流速率下，具有超长的循环稳定性，在0.5 C下进行1500次循环后容量保持率为59.3％，并且可以在-30至70°C的温度下正常工作。异位X射线衍射表明，长期容量归因于与锡和锂生成LixSn的可逆反应，容量损失归因于不可逆反应和Li2Se的出现。出色的电化学性能，例如高比容量，可接受的速率特性，超长的循环寿命和宽温度操作，使得SnSe2 / grapheme异质结构非常适合全气候LIB。