Fig. S5 b) Plot of specific capacity and efficiency vs. cycle number of stoichiometric SnS in Na half-cell at 150 mA g−1.			
cycle number	discharge capacity/mAhg-1	charge capacity/mAhg-1	efficiency/%
0	147.089	390.911	37.62723
1	144.668	173.402	83.42926
2	143.81	165.338	86.9794
3	143.119	161.323	88.71581
4	142.431	158.798	89.6932
5	141.844	156.798	90.46289
6	141.216	155.174	91.00494
7	140.64	153.693	91.5071
8	140.053	152.576	91.79229
9	139.481	151.531	92.04783
10	139.158	150.811	92.27311
11	139.256	150.453	92.55781
12	138.837	149.253	93.02125
13	138.272	148.282	93.24935
14	137.709	147.689	93.24256
15	137.049	146.885	93.3036
16	136.551	146.416	93.26235
17	135.993	145.866	93.23146
18	135.378	145.24	93.20986
19	135.106	144.623	93.41944
20	134.647	143.908	93.56464
21	133.957	143.357	93.44294
22	133.556	142.526	93.70641
23	133.481	142.294	93.80649
24	133.147	142.475	93.45289
25	131.777	140.587	93.73342
26	131.941	140.689	93.78203
27	131.131	140.26	93.49137
28	130.922	139.58	93.79711
29	130.56	139.337	93.70088
30	129.713	138.209	93.85279
31	128.984	137.763	93.62746
32	128.414	137.004	93.73011
33	127.625	136.252	93.66835
34	127.079	135.897	93.51126
35	126.305	135.109	93.48378
36	125.333	134.252	93.35652
37	124.306	132.774	93.62225
38	123.736	132.511	93.37791
39	123.015	131.712	93.39696
40	122.357	131.039	93.37449
41	121.699	130.374	93.34607
42	121.031	129.675	93.3341
43	120.093	128.804	93.23701
44	119.35	128.028	93.2218
45	118.876	127.667	93.11412
46	118.293	127.014	93.13383
47	117.037	125.7	93.10819
48	116.855	125.525	93.09301
49	116.168	125.002	92.93291
