Lithium-ion battery including doped positive electrode active material
View Patent ↗A lithium-ion battery includes a positive electrode and an electrolyte. A positive electrode active material included in the positive electrode includes a doping element. The doping element includes at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and a percentage of the doping element satisfies 0.01%≤W1%≤0.5%. The electrolyte includes an oligomer according to formula (I), and a percentage of the oligomer satisfies 0.1%≤W2≤10% s.
1 . A lithium-ion battery, comprising:
a positive electrode, a liquid electrolyte, and an additive, wherein a positive electrode active material comprised in the positive electrode comprises a doping element, the doping element comprises at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, a percentage W1 of the doping element based on a weight of the positive electrode active material satisfies 0.01%≤W1%≤0.5%, and the liquid electrolyte comprises an oligomer according to formula (I),
wherein P1 and q1 are the numbers of repeated units, P1 is an integer from 1 to 10, and q1 is an integer from 1 to 15; a percentage W2 of the oligomer based on a total weight of the liquid electrolyte satisfies 5%≤W2≤10%; and a ratio of W2 to W1 satisfies 25≤W2/W1≤50; and
wherein the additive comprises lithium triflate or lithium borate diacetate.
2 . The lithium-ion battery according to claim 1 , wherein the percentage W1 of the doping element is 0.01-0.4%.
3 . The lithium-ion battery according to claim 1 , wherein in formula (I), P1 is an integer from 2 to 8, and q1 is an integer from 2 to 10.
4 . The lithium-ion battery according to claim 1 , wherein the doping element comprises at least one selected from Mg, Al, Zr, and B.
5 . The lithium-ion battery according to claim 1 , wherein the positive electrode active material comprises a positive electrode active material according to the following formula:
Li x [Ni y Co z Mn w ]O 2 ,
wherein 0.8≤x≤1.2, 0.5≤y<1, 0<z≤0.3, and 0<w≤0.3.
6 . The lithium-ion battery according to claim 1 , wherein a solvent in the liquid electrolyte comprises at least one selected from ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, fluoroethylene carbonate, ethyl acetate, and ethyl propionate.
7 . The lithium-ion battery according to claim 1 , wherein lithium salt in the liquid electrolyte comprises at least one selected from LiPF 6 and lithium bis(fluorosulfonyl)imide.
8 . The lithium-ion battery according to claim 1 , further comprising:
a negative electrode, wherein a negative electrode active material comprised in the negative electrode comprises at least one selected from natural graphite, artificial graphite, mesocarbon microbeads, hard carbon, soft carbon, silicon, silicon-carbon composite, Li—Sn alloy, Li—Sn—O alloy, Sn, SnO, SnO 2 , spinel structure lithiated TiO 2 —Li 4 Ti 5 O 12 , and Li—Al alloy.
9 . The lithium-ion battery according to claim 1 , wherein a surface of the positive electrode active material is coated with carbon.
10 . The lithium-ion battery according to claim 1 , wherein the additive has an amount of 0-5% by weight based on the total weight of the liquid electrolyte.
11 . The lithium-ion battery according to claim 1 , wherein the doping element comprises at least one selected from Cu, V, Cr, In, Ta, La, Ga, Sc, Gd, Sm, Nb, and Mo.
12 . An electric apparatus, comprising the lithium-ion battery according to claim 1 .
13 . A lithium-ion battery, comprising:
a positive electrode and a liquid electrolyte, wherein a positive electrode active material comprised in the positive electrode comprises a doping element, the doping element comprises at least one selected from W, Cu, V, Cr, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Nb, and Mo, a percentage W1 of the doping element based on a weight of the positive electrode active material satisfies 0.01%≤W1%≤0.5%, and the liquid electrolyte comprises an oligomer according to formula (I),
wherein P1 and q1 are the numbers of repeated units, P1 is an integer from 1 to 10, and q1 is an integer from 1 to 15; a percentage W2 of the oligomer based on a total weight of the liquid electrolyte satisfies 5%≤W2≤10%; and
wherein the additive comprises lithium triflate or lithium borate diacetate.
14 . A lithium-ion battery, comprising:
a positive electrode and an electrolyte, wherein a positive electrode active material comprised in the positive electrode comprises a doping element, the doping element comprises at least one selected from Cu, V, Cr, In, Ta, La, Ga, Sc, Gd, Sm, Nb, and Mo, a percentage W1 of the doping element based on a weight of the positive electrode active material satisfies 0.01%≤W1%≤0.5%, and the electrolyte comprises an oligomer according to formula (I),
wherein P1 and q1 are the numbers of repeated units, P1 is an integer from 1 to 10, and q1 is an integer from 1 to 15; a percentage W2 of the oligomer based on a total weight of the electrolyte satisfies 0.1%≤W2≤10%; and a ratio of W2 to W1 satisfies 25≤W2/W1≤50.