Doped titanium niobate and battery
Doped titanium niobate is provided, which has a chemical structure of Ti (1-x) M1 x Nb (2-y) M2 y O (7-z) Q z or Ti (2-x′) M1 x′ Nb (10-y′) M2 y′ O (29-z′) Q z′ , wherein M1 is Li, Mg, or a combination thereof; M2 is Fe, Mn, V, Ni, Cr, or a combination thereof; Q is F, Cl, Br, I, S, or a combination thereof; 0≤x≤0.15; 0≤y≤0.15; 0.01≤z≤2; 0≤x′≤0.3; 0≤y′≤0.9; and 0.01≤z′≤8.
1 . Doped titanium niobate, having a chemical structure of:
Ti (1-x) M1 x Nb (2-y) M2 y O (7-z) Q z or Ti (2-x′) M1 x′ Nb (10-y′) M2 y′ O (29-z′) Q z′ ,
wherein M1 is Li, Mg, or a combination thereof;
M2 is Fe, Mn, V, Ni, Cr, or a combination thereof;
Q is F, Cl, Br, I, S, or a combination thereof;
0≤x≤0.15;
0≤y≤0.15;
0.01≤z≤2;
0≤x′≤0.3;
0≤y′≤0.9; and
0.01≤z′≤8,
wherein Ti (1-x) M1 x Nb (2-y) M2 y O (7-z) Q z has a monoclinic lattice.
2 . The doped titanium niobate as claimed in claim 1 , wherein Ti (2-x′) M1 x′ Nb (10-y′) M2 y′ O (29-z′) Q z ; has a ReO 3 type crystal structure.
3 . The doped titanium niobate as claimed in claim 1 , being a porous structure composed of a plurality of primary particles.
4 . The doped titanium niobate as claimed in claim 3 , wherein the porous structure has a median particle size of 0.3 micrometers to 60 micrometers, the primary particles have a median particle size of 0.01 micrometers to 5 micrometers, and the porous structure has a pore size of 50 nanometers to 1 micrometer.
5 . The doped titanium niobate as claimed in claim 1 , being a non-porous structure.
6 . The doped titanium niobate as claimed in claim 5 , wherein the non-porous structure has a median particle size of 0.01 micrometers to 10 micrometers.
7 . The doped titanium niobate as claimed in claim 1 , further mixing with lithium titanate to form a composite material, wherein the doped titanium niobate and the lithium titanate have a weight ratio of 90:10 to 10:90.
8 . The doped titanium niobate as claimed in claim 7 , wherein surface of the lithium titanate is covered with carbon, oxide, or fluoride, wherein the carbon, oxide, or fluoride and the lithium titanate have a weight ratio of greater than 0 and less than or equal to 5%.
9 . The doped titanium niobate as claimed in claim 7 , wherein the surface of the composite material is covered with carbon, oxide, or fluoride, wherein the carbon, oxide, or fluoride and the composite material have a weight ratio of greater than 0 and less than or equal to 5%.
10 . The doped titanium niobate as claimed in claim 1 , wherein the surface of the doped titanium niobate is covered with carbon, oxide, or fluoride, wherein the carbon, oxide, or fluoride and the doped titanium niobate have a weight ratio of greater than 0 and less than or equal to 5%.
11 . A battery, comprising:
a negative electrode;
a positive electrode; and
an electrolyte disposed between the negative electrode and the positive electrode,
wherein the negative electrode comprises doped titanium niobate, having a chemical structure of:
Ti (1-x) M1 x Nb (2-y) M2 y O (7-z) Q z or Ti (2-x′) M1 x′ Nb (10-y′) M2 y′ O (29-z′) Q z′ ,
wherein M1 is Li, Mg, or a combination thereof;
M2 is Fe, Mn, V, Ni, Cr, or a combination thereof;
Q is F, Cl, Br, I, S, or a combination thereof;
0≤x≤0.15;
0≤y≤0.15;
0.01≤z≤2;
0≤x′≤0.3;
0≤y′≤0.9; and
0.01≤z′≤8,
wherein Ti (1-x) M1 x Nb (2-y) M2 y O (7-z) Q z has a monoclinic lattice.
12 . The battery as claimed in claim 11 , wherein Ti (2-x′) M1 x′ Nb (10-y′) M2 y′ O (29-z′) Q z′ has a ReO 3 type crystal structure.
13 . The battery as claimed in claim 11 , wherein the negative electrode further comprises lithium titanate, the lithium titanate and the doped titanium niobate are mixed to form a composite material, and the doped titanium niobate and the lithium titanate have a weight ratio of 90:10 to 10:90.
14 . The battery as claimed in claim 13 , wherein the surface of the lithium titanate is covered with carbon, oxide, or fluoride, wherein the carbon, oxide, or fluoride and the lithium titanate have a weight ratio of greater than 0 and less than or equal to 5%.
15 . The battery as claimed in claim 13 , wherein the surface of the composite material is covered with carbon, oxide, or fluoride, wherein the carbon, oxide, or fluoride and the composite material have a weight ratio of greater than 0 and less than or equal to 5%.
16 . The battery as claimed in claim 11 , wherein the surface of the doped titanium niobate is covered with carbon, oxide, or fluoride, wherein the carbon, oxide, or fluoride and the doped titanium niobate have a weight ratio of greater than 0 and less than or equal to 5%.
17 . The doped titanium niobate as claimed in claim 1 , wherein 0<x≤0.15.
18 . The battery as claimed in claim 11 , wherein 0<x≤0.15.
19 . Doped titanium niobate, consisting of a compound having a chemical structure of:
Ti (1-x) M1 x Nb (2-y) M2 y O (7-z) Q z or Ti (2-x′) M1 x′ Nb (10-y′) M2 y′ O (29-z′) Q z′ ,
wherein M1 is Li, Mg, or a combination thereof;
M2 is Fe, Mn, V, Ni, Cr, or a combination thereof;
Q is F, Cl, Br, I, S, or a combination thereof;
0≤x≤0.15;
0≤y≤0.15;
0.01≤z≤2;
0≤x′≤0.3;
0≤y′≤0.9; and
0.01≤z′≤8,
wherein Ti (1-x) M1 x Nb (2-y) M2 y O (7-z) Q z has a monoclinic lattice.