A strontium-doped Li2FeSiO4/Ccathode withenhanced performance for the lithium-ion battery

Long Qua, Mingtao Lia, Lulu Biana, Qingyang Du a, Mulan Luo a, Bolun Yang a,*,Li Yang b,Shaohua Fang b, Yi Liu b

aSchool of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an710049, China

bSchool of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Corresponding authors

Tel: 86-29-82663189.

Fax: 86-29-82663189.

E-mail: (B.L. Yang).

Table captions

Table S1.Bond lengths and angels ofthe (a) Sr0-LFS, (b) Sr1-LFSand (c) Sr3-LFS samples.

Figure captions

Fig. S1. SEM image of the Sr3-LFS sample.

Fig. S2. TEM image of the Sr3-LFS sample.

Table S1.Bond lengths and angels ofthe (a) Sr0-LFS, (b) Sr1-LFSand (c) Sr3-LFS samples.

(a)Sr0-LFS

LiO4(1) / O1 / O1 / O3 / O4
O1 / 2.1169 / 116.69 / 116.33 / 116.29
O1 / 3.5978 / 2.1097 / 91.01 / 104.70
O3 / 3.5092 / 2.9415 / 2.0131 / 108.58
O4 / 3.2568 / 3.0334 / 3.0274 / 1.7089
LiO4(2) / O2 / O2 / O3 / O4
O2 / 1.7596 / 86.06 / 125.81 / 106.01
O2 / 2.8220 / 2.3305 / 114.72 / 80.26
O3 / 3.1897 / 3.5084 / 1.8231 / 125.87
O4 / 2.9246 / 2.7469 / 3.3162 / 1.9006
SiO4 / O1 / O2 / O3 / O4
O1 / 1.5202 / 126.66 / 99.54 / 95.90
O2 / 2.8358 / 1.6526 / 119.35 / 78.55
O3 / 2.5135 / 2.9509 / 1.7656 / 76.93
O4 / 2.8707 / 2.5394 / 2.5514 / 2.2840
FeO4 / O1 / O2 / O3 / O4
O1 / 1.9369 / 128.49 / 94.82 / 102.13
O2 / 3.4963 / 1.9451 / 106.22 / 124.81
O3 / 2.9415 / 3.2016 / 2.0571 / 87.37
O4 / 3.0741 / 3.5093 / 2.8125 / 2.0144

(b)Sr1-LFS

LiO4(1) / O1 / O1 / O3 / O4
O1 / 1.8755 / 95.23 / 112.15 / 121.91
O1 / 3.2760 / 2.5204 / 82.98 / 92.40
O3 / 3.3833 / 3.1340 / 2.1961 / 125.93
O4 / 3.1199 / 3.0939 / 3.4706 / 1.6917
LiO4(2) / O2 / O2 / O3 / O4
O2 / 1.7522 / 98.73 / 108.64 / 124.59
O2 / 2.9273 / 2.0942 / 102.09 / 119.98
O3 / 2.9835 / 3.1227 / 1.9189 / 100.62
O4 / 3.2106 / 3.4376 / 2.9186 / 1.8735
SiO4 / O1 / O2 / O3 / O4
O1 / 1.5244 / 108.18 / 128.57 / 115.87
O2 / 2.7141 / 1.8198 / 98.87 / 95.61
O3 / 3.0026 / 2.7540 / 1.8055 / 103.61
O4 / 2.7512 / 2.6231 / 2.7710 / 1.7197
FeO4 / O1 / O2 / O3 / O4
O1 / 2.0681 / 126.49 / 90.01 / 112.25
O2 / 3.6062 / 1.9701 / 90.46 / 118.30
O3 / 3.0479 / 2.9937 / 2.2384 / 107.91
O4 / 3.3873 / 3.4184 / 3.4389 / 2.0116

(c)Sr3-LFS

LiO4(1) / O1 / O1 / O3 / O4
O1 / 2.0778 / 117.81 / 110.60 / 119.64
O1 / 3.4187 / 1.9135 / 94.36 / 53.72
O3 / 3.6000 / 3.1004 / 2.2984 / 128.63
O4 / 3.0084 / 1.5621 / 3.3376 / 1.3786
LiO4(2) / O2 / O2 / O3 / O4
O2 / 1.9489 / 103.73 / 130.68 / 86.58
O2 / 3.1003 / 1.9927 / 92.82 / 126.99
O3 / 3.5767 / 2.8822 / 1.9868 / 119.39
O4 / 2.8710 / 3.7781 / 3.6405 / 2.2275
SiO4 / O1 / O2 / O3 / O4
O1 / 1.4575 / 100.46 / 83.37 / 85.07
O2 / 2.2991 / 1.5330 / 107.75 / 87.45
O3 / 2.1447 / 2.6554 / 1.7506 / 104.79
O4 / 2.8056 / 2.8959 / 3.4208 / 2.5259
FeO4 / O1 / O2 / O3 / O4
O1 / 2.1316 / 118.45 / 104.54 / 98.58
O2 / 3.3145 / 1.7183 / 96.98 / 122.47
O3 / 3.4585 / 2.9844 / 2.2403 / 115.42
O4 / 3.7260 / 3.9523 / 4.2312 / 2.7545

Fig. S1.SEM image of the Sr3-LFS sample.

Fig. S2.TEM image of the Sr3-LFS sample.