LITHIUM-ION BATTERY AND DEVICE
This application provides a lithium-ion battery and a device. The lithium-ion battery includes a positive electrode plate, a negative electrode plate, a separator located between the positive electrode plate and the negative electrode plate, and an electrolytic solution. A lithium-supplementing layer and a first functional coating are sequentially disposed on a surface of the negative electrode plate facing the separator. A second functional coating is disposed on a surface of the separator facing the negative electrode plate. Both the first functional coating and the second functional coating contain an organic porous particulate material. In the lithium-ion battery provided in this application, the first functional coating and the second functional coating are added to enhance stability of the lithium-ion battery, improve safety of the lithium-ion battery, and effectively improve cycle performance of the lithium-ion battery.
1 . A lithium-ion battery, comprising a positive electrode plate, a negative electrode plate, a separator located between the positive electrode plate and the negative electrode plate, and an electrolytic solution, wherein
a lithium-supplementing layer and a first functional coating are sequentially disposed on a surface of the negative electrode plate facing the separator;
a second functional coating is disposed on a surface of the separator facing the negative electrode plate;
both the first functional coating and the second functional coating contain an organic porous particulate material, and a compressibility S of the organic porous particulate material ranges from 40% to 90%;
wherein, S =( H−h )/ H , and
H represents an original particle height of the organic porous particulate material, and h represents a particle height of the organic porous particulate material that has been pressed for 1 minute under a pressure of 2 Mpa.
2 . The lithium-ion battery according to claim 1 , wherein the compressibility S of the organic porous particulate material ranges from 50% to 80%.
3 . The lithium-ion battery according to claim 1 , wherein the organic porous particulate material is one or more selected from acrylate, polyacrylate, polypropylene, polyethylene, polyamide, polyborate, polysulfone, polyarylate, polyvinylpyridine, and polyaniline.
4 . The lithium-ion battery according to claim 1 , wherein the organic porous particulate material is a polymer with a weight-average molecular weight of 500˜2,000,000.
5 . The lithium-ion battery according to claim 4 , wherein the organic porous particulate material is an ester or an organic polymer containing carboxyl or hydroxyl.
6 . The lithium-ion battery according to claim 5 , wherein the organic porous particulate material is one or more selected from polyacrylate, polypropylene carbonate, aromatic copolyester, polyurethane, polyhydroxybutyrate, poly fatty acid ester, acrylic resin (carboxyl), polyacrylic resin, hexahydroxy triphenyl, and polyvinyl alcohol.
7 . The lithium-ion battery according to claim 4 , wherein a significant surface functional group of the organic porous particulate material is one or more selected from carboxyl, hydroxyl, ester, alkenyl, and alkyl.
8 . The lithium-ion battery according to claim 1 , wherein a particle size of the organic porous particulate material is 1 μm to 70 μm.
9 . The lithium-ion battery according to claim 8 , wherein the particle size of the organic porous particulate material is 5 μm to 50 μm.
10 . The lithium-ion battery according to claim 8 , wherein a pore size of the organic porous particulate material is 1 nm to 200 nm.
11 . The lithium-ion battery according to claim 10 , wherein the pore size of the organic porous particulate material is 5 nm to 50 nm.
12 . The lithium-ion battery according to claim 1 , wherein the organic porous particulate material is a hollow structure and/or a through-hole structure.
13 . The lithium-ion battery according to claim 1 , wherein a crystallinity of the organic porous particulate material is 30% to 80%.
14 . The lithium-ion battery according to claim 13 , wherein the crystallinity of the organic porous particulate material is 30% to 50%.
15 . The lithium-ion battery according to claim 1 , wherein a crosslinkability of the organic porous particulate material is 20% to 80%.
16 . The lithium-ion battery according to claim 15 , wherein the crosslinkability of the organic porous particulate material is 20% to 70%.
17 . The lithium-ion battery according to claim 1 , wherein an inorganic coating is disposed between the separator and the second functional coating, the inorganic coating comprises an inorganic particulate material, and the inorganic particulate material is one or more selected from aluminum oxide, silicon monoxide, silicon dioxide, zirconium dioxide, manganese oxide, magnesium oxide, calcium oxide, and calcium carbonate.
18 . The lithium-ion battery according to claim 17 , wherein the first functional coating, the second functional coating, and the inorganic coating each further contain a binder, and the binder is one or more selected from polyacrylate, polyacrylate copolymer, polyvinylidene difluoride, vinylidene-difluoride-hexafluoropropylene copolymer, styrene butadiene rubber, and sodium hydroxymethyl cellulose.
19 . A device, wherein a drive source or a storage source of the device is a lithium-ion battery, and the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator located between the positive electrode plate and the negative electrode plate, and an electrolytic solution, wherein
a lithium-supplementing layer and a first functional coating are sequentially disposed on a surface of the negative electrode plate facing the separator;
a second functional coating is disposed on a surface of the separator facing the negative electrode plate;
both the first functional coating and the second functional coating contain an organic porous particulate material, and a compressibility S of the organic porous particulate material ranges from 40% to 90%;
wherein, S =( H−h )/ H , and
H represents an original particle height of the organic porous particulate material, and h represents a particle height of the organic porous particulate material that has been pressed for 1 minute under a pressure of 2 Mpa.