Lithium-ion battery

Patent metadata

Field	Value
Publication number	US-2020006801-A1
Application number	US-201916272917-A
Country	US
Kind code	A1
Filing date	Feb 11, 2019
Priority date	Jun 29, 2018
Publication date	Jan 2, 2020
Grant date	—

Abstract

The present disclosure provides a lithium-ion battery, and the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte. The positive active material comprises a material with a chemical formula of LiaNixCoyM1-x-yO2, the negative active material comprises graphite, the OI value of the positive film represented by OIc and the OI value of the negative film represented by OIa satisfy a relationship: 0.05≤OIa/OIc≤10. By reasonably matching the OI value of the positive film represented by OIc and the OI value of the negative film represented by OIa and making OIa/OIc between 0.05 and 10, the dynamics performance of the positive electrode plate and the dynamics performance of the negative electrode plate can achieve an optimal match, the lithium-ion battery can have higher charging capability, and also have excellent cycle life and excellent safety performance during the long-term fast charging use.

First claim

1 . A lithium-ion battery comprising a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the positive electrode plate comprising a positive current collector and a positive film, the positive film being provided on at least one surface of the positive current collector and comprising a positive active material, the negative electrode plate comprising a negative current collector and a negative film, the negative film being provided on at least one surface of the negative current collector and comprising a negative active material;
wherein the positive active material comprises a material with a chemical formula of Li a Ni x Co y M 1-x-y O 2 , M is one or two selected from Al and Mn, 0.95≤a≤1.2, 0<x<1, 0<y<1, 0<x+y<1; the negative active material comprises graphite; an OI value of the positive film represented by OI c and an OI value of the negative film represented by OI a satisfy a relationship: 0.05≤OI a /OI c ≤10.

2 . (canceled)

3 . The lithium-ion battery according to claim 1 , wherein the OI value of the positive film represented by OI c and the OI value of the negative film represented by OI a satisfy a relationship: 0.2≤OI a /OI c ≤3.

4 . (canceled)

5 . The lithium-ion battery according to claim 1 , wherein
the OI value of the positive film represented by OI c is 5˜80; the OI value of the negative film represented by OI a is 5˜30.

6 . (canceled)

7 . The lithium-ion battery according to claim 1 , wherein
an average particle diameter D50 of the positive active material is 3 μm˜12 μm; an average particle diameter D50 of the negative active material is 4 μm˜15 μm.

8 . The lithium-ion battery according to claim 1 , wherein
an OI value of a powder of the positive active material represented by G OI is 3˜15; an OI value of a powder of the negative active material represented by V OI is 2˜15.

9 . The lithium-ion battery according to claim 8 , wherein
the OI value of a powder of the positive active material represented by G OI is 5˜10; the OI value of a powder of the negative active material represented by V OI is 2˜11.

10 . (canceled)

11 . The lithium-ion battery according to claim 1 , wherein
the pressing density of the positive film is 3.0 g/cm 3 ˜3.5 g/cm 3 ; the pressing density of the negative film is 1.0 g/cm 3 ˜1.6 g/cm 3 .

12 . The lithium-ion battery according to claim 1 , wherein the positive active material further comprises one or more selected from a group consisting of layered LiMnO 2 , spinel LiMn 2 O 4 , LiNi x Mn 2-x O 4 , LiCoO 2 and LiFePO 4 , 0<x<2.

13 . The lithium-ion battery according to claim 1 , wherein
doping modification and/or coating modification is further performed on the positive active material.

14 - 15 . (canceled)

16 . The lithium-ion battery according to claim 1 , wherein the negative active material further comprises one or more selected from a group consisting of soft carbon, hard carbon, carbon fiber, mesocarbon microbeads, silicon-based material, tin-based material and lithium titanate.

17 . The lithium-ion battery according to claim 3 , wherein the OI value of the positive film represented by OI c and the OI value of the negative film represented by OI a satisfy a relationship: 0.2≤OI a /OI c ≤0.60.

18 . The lithium-ion battery according to claim 5 , wherein the OI value of the positive film represented by OI c is 10˜80.

19 . The lithium-ion battery according to claim 18 , wherein the OI value of the positive film represented by OI c is 15˜80.

20 . The lithium-ion battery according to claim 19 , wherein the OI value of the positive film represented by OI c is 28˜50.

21 . The lithium-ion battery according to claim 5 , wherein the OI value of the negative film represented by OI a is 12˜30.

22 . The lithium-ion battery according to claim 21 , wherein the OI value of the negative film represented by OI a is 15˜30.

23 . The lithium-ion battery according to claim 7 , wherein
the average particle diameter D50 of the positive active material is 3 μm˜7.8 μm; and/or, the average particle diameter D50 of the negative active material is 4 μm˜12 μm.

24 . The lithium-ion battery according to claim 11 , wherein
the pressing density of the positive film is 3.3 g/cm 3 ˜3.5 g/cm 3 ; and/or, the pressing density of the negative film is 1.40 g/cm 3 ˜1.6 g/cm 3 .

25 . The lithium-ion battery according to claim 1 , wherein the positive active material comprises one or more selected from a group consisting of LiNi 0.5 Co 0.2 Mn 0.3 O 2 , LiNi 0.6 Co 0.2 Mn 0.2 O 2 , LiNi 0.8 Co 0.1 Mn 0.1 O 2 , LiNi 0.8 Co 0.1 Al 0.1 O 2 and LiNi 0.85 Co 0.15 Al 0.05 O 2 .

26 . The lithium-ion battery according to claim 1 , wherein at least a part of the positive active material is single particle.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Cao Jiao
• Zou Qifan
• Lu Guangbo
• Wang Shengwei
• Xu Wenzhu

Classifications

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title