Cathode additive, method of preparing same, cathode comprising same, and lithium secondary battery

A lithium secondary battery and additive technology, which is applied in the field of positive electrode additives, its manufacture, positive electrodes and lithium secondary batteries containing it, can solve the problems of reduced energy density and reduced battery life, and achieve the effect of offsetting the initial irreversible capacity

Pending Publication Date: 2021-03-30
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During battery operation, energy density may gradually decrease and battery life may decrease

Method used

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  • Cathode additive, method of preparing same, cathode comprising same, and lithium secondary battery
  • Cathode additive, method of preparing same, cathode comprising same, and lithium secondary battery
  • Cathode additive, method of preparing same, cathode comprising same, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] (1) Manufacture of positive electrode additives

[0132] Will Li 2 O, NiO and (NH 4 ) 2 HPO 4 Blend to make stock mixture.

[0133] However, Li 2 O and NiO are mixed in a molar ratio of 1:1 so that the molar ratio of Li:Ni in the raw material mixture is 2:1, and based on the total amount (100% by weight) of the raw material mixture, (NH 4 ) 2 HPO 4 Set to 5% by weight.

[0134] Under the condition of introducing nitrogen as an inert gas at a rate of 2 L / min, the raw material mixture was heat-treated at 680° C. for 10 hours, thereby obtaining the positive electrode additive of Example 1.

[0135] (2) Manufacture of positive electrodes and lithium secondary batteries (coin-type full batteries)

[0136]The positive electrode additive of embodiment 1, conductive material (Super-P, Denka Black) and binding agent (PVdF) are mixed in organic solvent with the weight ratio of 97:2:1 (positive electrode additive: conductive material: binding agent) , to prepare the posi...

Embodiment 2

[0140] (1) Manufacture of positive electrode additives

[0141] The positive electrode additive of Example 2 was obtained in a manner similar to that of Example 1, except that the heat treatment temperature was changed from 680°C to 730°C.

[0142] (2) Manufacture of positive electrodes and lithium secondary batteries (coin-type full batteries)

[0143] The positive electrode and lithium secondary battery of Example 2 were obtained in a manner similar to that of Example 1, except that the positive electrode additive of Example 2 was used instead of the positive electrode additive of Example 1.

Embodiment 3

[0145] (1) Manufacture of positive electrode additives

[0146] The positive electrode additive of Example 3 was obtained in a manner similar to that of Example 1, except that the heat treatment temperature was changed from 680°C to 850°C.

[0147] (2) Manufacture of positive electrodes and lithium secondary batteries (coin-type full batteries)

[0148] The positive electrode and lithium secondary battery of Example 3 were obtained in a manner similar to that of Example 1, except that the positive electrode additive of Example 3 was used instead of the positive electrode additive of Example 1.

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Abstract

The present invention relates to a cathode additive, a method of preparing same, a cathode comprising same, and a lithium secondary battery. More specifically, one embodiment of the present inventionprovides a cathode additive for a lithium secondary battery, the additive comprising: a compound represented by chemical formula 1; a compound represented by chemical formula 2; and lithium phosphate(Li3PO4): [Chemical formula 1] Li2+aNibM1-bO2+c In chemical formula 1, M is a metal element forming a divalent cation, -0.2<=a<=0.2, 0.5<=b<=1.0, and -0.2<=c<=0.2, and [Chemical formula 2] Ni2-eM1-eP4O12 in chemical formula 2, 0.5<=e<=1.0, and M is as defined in chemical formula 1. According to another embodiment of the present invention, the cathode additive of the one embodiment may be preparedby thermally treating a source mixture containing a lithium source material, a nickel source material, and a phosphorus source material at a temperature range of 600-900 DEG C in a reactor to which aninert gas is supplied at a flow rate of 1.5-2.5 L/min.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0062076 filed with the Korean Intellectual Property Office on May 27, 2019, the entire contents of which are hereby incorporated by reference. [0003] The present disclosure relates to a positive electrode additive, a manufacturing method thereof, and a positive electrode and a lithium secondary battery including the positive electrode additive. Background technique [0004] In lithium secondary batteries, electrode active materials capable of reversibly intercalating and deintercalating lithium ions are applied to the anode and cathode, respectively, and the lithium ions migrate through the electrolyte to generate electricity through redox reactions at each electrode. [0005] Moreover, in the first charge-discharge cycle of a lithium secondary battery, lithium ions that are intercalated into the negative electrode (battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C01G53/00C01G53/04C01B25/30H01M10/052H01M4/02
CPCH01M4/62H01M10/052C01B25/45C01B25/445H01M2004/028H01M4/131H01M4/1391H01M4/366H01M4/525H01M10/0567H01M2300/0025C01G53/42C01G53/04C01B25/30C01P2004/80C01G53/50C01P2006/40H01M4/5825H01M10/0525H01M2220/20
Inventor 李宝蓝朴信英柳泰求金泰坤郭玟郑王谟
Owner LG ENERGY SOLUTION LTD
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