Lithium manganese secondary battery

Patent metadata

Field	Value
Publication number	US-9947915-B2
Application number	US-67672307-A
Country	US
Kind code	B2
Filing date	Feb 20, 2007
Priority date	Feb 17, 2006
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

Disclosed is a manganese-based lithium secondary battery comprising a cathode containing manganese-based lithium metal oxide, an anode, and an electrolyte, wherein the anode comprises an anode active material in which a Mn scavenger capable of reducing manganese ions on a surface by conducting or semiconducting properties is coated on part or all of anode active material particles. Through the use of the Mn scavenger, manganese ion dissolved from the manganese-based cathode active material into the electrolyte is preferentially deposited on the Mn scavenger coated on the surface of the anode active material particles, such that the dissolved manganese ion is inhibited from being deposited directly on the surface of the anode active material, and a decomposition of the electrolyte with the deposited manganese component is inhibited. Accordingly, the use of the Mn scavenger can provide a manganese-based lithium secondary battery having excellent storage performance.

First claim

What is claimed is:

1. A manganese-based lithium secondary battery, comprising:
a cathode containing manganese-based lithium metal oxide;
an anode; and
an electrolyte,
wherein the manganese-based lithium metal oxide comprises more than 30 wt % of a manganese spinel-based cathode active material,
wherein the anode comprises particles having a core-shell structure, where a particle core is an anode active material and a Mn scavenger layer covers part or all of the surface of the particle core,
wherein the anode active material is a carbon-based material,
wherein the Mn scavenger layer is TiO 2 and is present in an amount of 0.1 to 20 weight percent, based on the total weight of the anode active material,
wherein the Mn scavenger layer has a thickness of 3 to 500 nanometers, and
wherein the carbon-based material is one or more selected from the group consisting of graphite-based carbon, coke-based carbon and hard carbon.

2. A power source for electric automobiles comprising the manganese-based lithium secondary battery of claim 1 .

3. The manganese-based lithium secondary battery of claim 1 , wherein the Mn scavenger is present in an amount of 0.1 to 10 weight percent, based on the total weight of the anode active material.

4. The manganese-based lithium secondary battery of claim 1 , wherein the Mn scavenger is present in an amount of 0.1 to 3 weight percent, based on the total weight of the anode active material.

5. The manganese-based lithium secondary battery of claim 1 , wherein a rate of increase in Mn concentration on a surface of the anode is not greater than 423.79% after storage of the battery at 55° C. for 10 days at 50% charge.

6. The manganese-based lithium secondary battery of claim 1 , wherein the battery has an output retention of greater than 84.1% to 90.1% measured at 50% charge after storage at 65° C. for 1 week.

7. The manganese-based lithium secondary battery of claim 1 , wherein the battery has an output retention of greater than 72.7% to 82.4% measured at 50% charge after storage at 65° C. for 2 weeks.

8. The manganese-based lithium secondary battery of claim 1 , wherein the electrolyte comprises an organic solvent selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxydhane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethylmethyl carbonate (EMC), gamma-butyrolactone, and mixtures thereof.

Assignees

• Kim Sun Kyu
• Jun Kyung Min
• Choi Seung Don
• Park Hong Kyu
• Lg Chemical Ltd

Inventors

• Kim Sun Kyu
• Jun Kyung Min
• Choi Seung Don
• Park Hong Kyu

Classifications

• H01M4/505 Primary

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

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M10/0525

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title