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Anode active material for secondary battery and lithium secondary battery comprising same

A positive electrode active material and secondary battery technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve problems such as unforeseen synergistic effects

Active Publication Date: 2015-03-25
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing cathode material mixtures are prepared only by mixing two components, so synergistic effects other than simple mixing may not be foreseen

Method used

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  • Anode active material for secondary battery and lithium secondary battery comprising same
  • Anode active material for secondary battery and lithium secondary battery comprising same
  • Anode active material for secondary battery and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Manufacture of positive electrode active materials

[0087] LiNi 0.55 mn 0.30 co 0.15 o 2 After mixing with PVdF, the mixture was heat-treated in the temperature range of 150°C to 600°C for 9 hours to prepare LiNi surface-treated with F (2000ppm) 0.55 mn 0.30 co 0.15 o 2 .

[0088] As a single-phase structure, it will have a D of 16-25 μm 50 LiCoO 2 with a D of about 2 to 10 μm 50 LiNi 0.55 mn 0.30 co 0.15 o 2 Mixed at a ratio of 70:30 to prepare a mixed positive active material.

experiment example 1

[0092] Changes in rolling density according to applied pressure to the cathode active materials prepared according to Example 1 and Comparative Example 1 were compared. The results are shown in image 3 middle.

[0093] as in image 3 Confirmed in , when and not in the bimodal form, by LiCoO 2 The compacted density of the positive active material having a bimodal form was about 0.4 g / cc higher when compared to a positive active material composed of a lithium nickel-based oxide having a similar average diameter thereto.

Embodiment 2

[0095] Manufacture of cathode

[0096] A positive electrode active material with a bimodal form was prepared in the same manner as in Example 1, except that Mg (1000 ppm) and Ti (1000 ppm) were doped, and LiCoO coated with Al (400 ppm) on the entire surface was used. 2 . In addition, the positive active material having a bimodal form, Super P as a conductive material, and polyvinylidene fluoride as a binder were mixed in a weight ratio of 96:2:2, and then N-methylpyrrolidone ( NMP) to prepare the slurry. The obtained positive electrode slurry was coated on an aluminum current collector, and then dried in a vacuum oven at 120 °C to prepare a positive electrode.

[0097] Manufacture of negative electrode

[0098] In the Si and SiO 2 After mixing at a molar ratio of 1:1, the resulting mixture was vacuum heat-treated at 800 °C to prepare SiO 1-x (where x is 0). SiO 1-x (available from Shinetsu), MAG-V2 (available from Hitachi), and AGM01 (available from Mitsubish) were mixe...

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Abstract

The present invention relates to an anode active material for a secondary battery, and a lithium secondary battery comprising same, and more specifically, to an anode active material for the secondary battery and a lithium secondary battery comprising same, the anode active material for the secondary battery having an operating voltage range of 2.50V to 4.35V and comprising: a lithium cobalt oxide and a surface-treated lithium nickel oxide, wherein the anode active material has a high rolling density due to a bimodal form in which the average particle size of the cobalt-based oxide and the average particle size of a lithium nickel complex oxide are different from each other.

Description

technical field [0001] The present invention relates to a positive electrode active material for a secondary battery and a lithium secondary battery comprising the same. More specifically, the present invention relates to a positive electrode active material for a secondary battery having an operating voltage range of 2.50V to 4.35V, the positive electrode active material comprising a lithium cobalt-based oxide and a surface-treated A lithium nickel-based oxide, wherein the positive electrode active material has a high compaction density through a bimodal form in which the average diameter of the cobalt-based oxide and the average diameter of the lithium nickel-based composite oxide are different. Background technique [0002] Currently, mobile devices continue to be reduced in weight and miniaturized, and at the same time are gradually becoming highly functional while providing multiple functions. Accordingly, secondary batteries have gradually increased capacity and volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M10/052
CPCH01M4/131H01M4/366H01M4/483H01M4/505H01M4/525H01M4/623H01M10/052H01M10/0525H01M4/364H01M4/62Y02E60/10H01M4/48
Inventor 金寿贞郑在彬朴炳吾
Owner LG ENERGY SOLUTION LTD
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