Composite cathode materials with controlled irreversible capacity loss for lithium ion batteries

Patent metadata

Field	Value
Publication number	US-9786906-B2
Application number	US-201214420198-A
Country	US
Kind code	B2
Filing date	Aug 8, 2012
Priority date	Aug 8, 2012
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Composite materials for a cathode of an electrochemical cell. The composite materials comprise Li[M1−xLix]O2 or yLi2MnO3.(1−y)LiMO2 (M=Ni, Co, Mn, 0<x<0.5, 0<y<1), and at least one of LiMn1.5Ti0.5O4 and LiMn1.5Ni0.5O4. A Li-ion electrochemical cell including a cathode comprising the composite materials is also provided. The Li-ion electrochemical cell controls irreversible capacity loss and maintain a good cycling stability.

First claim

What is claimed is:

1. A cathode composition for a lithium ion battery, comprising:
LiMn 1.5 Ti 0.5 O 4 and Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 , wherein the LiMn 1.5 Ti 0.5 O 4 and
Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 are provided in a molar ratio of about 1:3.

2. The composition according to claim 1 , wherein the LiMn 1.5 Ti 0.5 O 4 comprises a spinel structure.

3. The composition according to claim 1 , wherein the Li[Li 0.2 Mn 0.54 Ni 0.13 CO 0.13 ]O 2 has a particle size of from about 100 nm to about 300 nm and the LiMn 1.5 Ti 0.5 O 4 has a particle size of from about 1 μm to about 2 μm.

4. The composition according to claim 1 , wherein particles of Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 and particles of LiMn 1.5 Ti 0.5 O 4 are evenly distributed throughout the composition.

5. A Li-ion electrochemical cell comprising a cathode, an anode, and a separator disposed between the cathode and the anode, wherein the cathode comprises a mixture of spinel LiMn 1.5 Ti 0.5 O 4 and Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 , wherein the spinel LiMn 1.5 Ti 0.5 O 4 and Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 are provided in a molar ratio of about 1:3.

6. The Li-ion electrochemical cell according to claim 5 , wherein a capacity retention of the Li-ion electrochemical cell is from about 80% to about 95% of an initial discharge capacity after about 40 cycles.

7. The Li-ion electrochemical cell according to claim 6 , wherein the capacity retention of the Li-ion electrochemical cell is about 90% of the initial discharge capacity after about 40 cycles.

8. The Li-ion electrochemical cell according to claim 5 , wherein a first coulombic efficiency of the Li-ion electrochemical cell is from about 75% to about 95%.

9. The Li-ion electrochemical cell according to claim 5 , wherein the first coulombic efficiency of the Li-ion electrochemical cell is about 93%.

10. The Li-ion electrochemical cell according to claim 5 , wherein a charge transfer resistance value of the Li-ion electrochemical cell is about 6.8Ω and about 11.4Ω after the second and twentieth cycle, respectively.

11. The Li-ion electrochemical cell according to claim 5 , wherein a first irreversible capacity loss of the Li-ion electrochemical cell is less than about 20 mAh/g.

12. The Li-ion electrochemical cell according to claim 11 , wherein the first irreversible capacity loss of the Li-ion electrochemical cell is about 17 mAh/g.

13. The Li-ion electrochemical cell according to claim 5 , wherein a first discharge capacity of the Li-ion electrochemical cell is from about 190 mAh/g to about 255 mAh/g.

14. The Li-ion electrochemical cell according to claim 13 , wherein the first discharge capacity of the Li-ion electrochemical cell is about 220 mAh/g.

Assignees

• Yang Jihui
• Wu Yan
• Yang Yong
• Wang Sihui
• Gm Global Tech Operations Llc

Inventors

• Yang Jihui
• Wu Yan
• Yang Yong
• Wang Sihui

Classifications

• H01M10/0525

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

• H01M4/362

  Composites · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/525 Primary

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

• H01M4/505

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