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Secondary battery having improved output characteristics

A secondary battery and battery technology, applied in the direction of secondary batteries, secondary battery manufacturing, batteries, etc., to achieve the effect of increasing energy density, improving the effect of high output, and reducing resistance

Active Publication Date: 2017-08-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when two cells are packaged independently, it is difficult to generate an electrochemical reaction between the two cells to compensate for the decay of either cell.

Method used

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  • Secondary battery having improved output characteristics
  • Secondary battery having improved output characteristics
  • Secondary battery having improved output characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0142] 1.2. Example 1-1: Preparation of a secondary battery with a positive electrode with a high load energy density

[0143] Similar to Comparative Example 1-1, LiNi with an average particle diameter of 10 μm was selected respectively x co y mn z o 2 powder and graphite powder having an average particle diameter of 10 μm were used as the positive electrode active material and the negative electrode active material.

[0144] Then, a process similar to Comparative Example 1-1 was performed to prepare 5 C batteries and 4 A batteries. The same types of electrode separators and battery separators used in Comparative Example 1-1 were also used in the preparation of the respective batteries.

[0145] In Example 1-1, when preparing the battery, compared with the comparative example, the thickness of the positive electrode coating was increased, so that the load energy density of the positive electrode was 3.8mAh / cm 2 . The load energy density as described above corresponds to ...

Embodiment 2-1

[0148] 1.3. Example 2-1: Preparation of a secondary battery with a positive electrode with a low load energy density

[0149] Similar to Example 1-1, respectively select LiNi with an average particle diameter of 10 μm x co y mn z o 2 powder and graphite powder having an average particle diameter of 10 μm were used as the positive electrode active material and the negative electrode active material.

[0150] Then, a process similar to Comparative Example 1-1 was performed to prepare 6 C batteries and 6 A batteries. The same type of electrode separator and battery separator used in Comparative Example 1-1 were also used in the preparation of the battery.

[0151] Unlike Comparative Example 1-1, compared with the positive electrode coating in Comparative Example 1-1, the thickness of the positive electrode coating is reduced, so that the load energy density of the positive electrode is 1.67mAh / cm 2 . The load energy density as described above corresponds to the specificatio...

Embodiment 3-1

[0154] 1.4. Example 3-1: Preparation of a secondary battery according to the present disclosure

[0155] Similar to Example 1-1, respectively select LiNi with an average particle diameter of 10 μm x co y mn z o 2 powder and graphite powder having an average particle diameter of 10 μm were used as the positive electrode active material and the negative electrode active material.

[0156] Then prepare 5 C to be arranged in the central battery block area with the same specifications as in Example 1-1 1 Batteries and 4 A 1 Battery. The only difference is: C set on the leftmost and rightmost of the central battery block 1 The thickness of the outermost negative electrode coating of the battery is as Figure 6 Adjust asymmetrically as shown in . Then prepare 6 C to be arranged in the side battery block with the same specifications as in Example 2-1 2 battery and 6 A 2 Battery. Subscripts "1" and "2" used herein indicate that the corresponding batteries were batteries prep...

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Abstract

A secondary battery having improved output characteristics is disclosed. The secondary battery according to the present invention accommodates a cell assembly, which is formed by connecting a plurality of cells in parallel, and an electrolyte together in one packing material, cathodes of a plurality of central cells disposed at a central part of the cell assembly have a loading energy density larger than that of cathodes of a plurality of side cells disposed at a side part, and the cathodes of the central cells have cathode material coating layers formed at surfaces thereof, which are thicker than those formed at surfaces of the cathodes of the side cells. Preferably, the total resistance of the side cells is smaller than the total resistance of the central cells.

Description

technical field [0001] The present disclosure relates to a secondary battery, and more particularly, to a secondary battery with improved output characteristics in which heterogeneous cells having different electrical characteristics from each other are connected in parallel and contained in a single package (package). [0002] This application claims the priority of Korean Patent Application No. 10-2014-0175296 filed in Korea on December 8, 2014 and Korean Patent Application No. 10-2014-0175288 filed in Korea on December 8, 2014, The disclosures of the aforementioned patent applications are incorporated herein by reference in their entirety. Background technique [0003] Lithium secondary batteries have high operating voltage and energy density and excellent output characteristics, and are widely used as energy sources for electronic products or electrically driven devices. [0004] A lithium secondary battery includes a battery assembly, an electrolyte, and a package por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/20H01M10/04H01M50/105H01M50/443H01M50/489H01M50/512H01M50/55
CPCH01M10/0413H01M50/105H01M50/443H01M50/55H01M50/512H01M50/489H01M2010/4292H01M2220/20H01M10/0525Y02E60/10Y02P70/50Y02T10/70H01M4/13H01M4/62H01M10/058
Inventor 李赫武吴松澤
Owner LG ENERGY SOLUTION LTD
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