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Lithium secondary battery composite electrode material and lithium secondary battery

A lithium secondary battery and composite electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve problems such as high cost and complex process

Active Publication Date: 2017-03-01
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are all coated with inorganic materials on the surface of the positive electrode, the process is complicated and the cost is high

Method used

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  • Lithium secondary battery composite electrode material and lithium secondary battery
  • Lithium secondary battery composite electrode material and lithium secondary battery
  • Lithium secondary battery composite electrode material and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0136] First, composite lithium-nickel-cobalt-manganese oxide is used as the positive electrode material and lithium metal is used as the negative electrode, with a common electrolyte (1.1M LiPF 6 EC / EMC / DEC), wherein the weight ratio of metastable polymer to all materials is about 0.5%.

[0137] The metastable polymer of Experimental Example 1 was 3% oligomer of phenylmethane maleimide (compound A) dissolved in NMP to form a mixed solution. Next, 2,4-dimethyl-2-imidazoline (2,4-bimethyl-2-imidazoline) (compound B) was added in batches to the above mixed solution, and thermal polymerization was carried out at 130°C for 8 hours, in which 3 The molar ratio of the oligomer of % benzyl maleimide to 2,4-dimethyl-2-imidazolium is 2:1. So far, the metastable polymer of Experimental Example 1 was obtained.

[0138] The metastable polymer of Experimental Example 1 is a polymer with a narrow molecular weight distribution, and its GPC (GelPermeationChromatography) gel permeation chroma...

experiment example 2

[0145] Using the same composite lithium nickel cobalt manganese oxide positive electrode material and lithium metal as the experimental example 1 as the negative electrode, with a common electrolyte (1.1M LiPF 6 EC / EMC / DEC), but changing the weight ratio of the metastable polymer to the lithium secondary battery composite electrode material to 1% (Test 1), 0.75% (Test 2) and 0.5% (Test 3). At 55°C, under the condition of a voltage of 2.8V-4.4V, charge at 0.2C and discharge at 0.5C, respectively, to obtain Figure 7 The graph of battery cycle life and capacity.

experiment example 3

[0150] Using the same composite lithium nickel cobalt manganese oxide positive electrode material and lithium metal as the negative electrode in Experimental Example 1 and collocation of common electrolyte (1.1M LiPF 6 EC / EMC / DEC) at room temperature in different voltage ranges (including 4.2V, 4.3V, 4.4V, 4.5V and 4.6V) to conduct capacitance tests at high operating voltages of batteries (Test 1), the results are shown in Figure 8 .

[0151] In addition, the same composite lithium-nickel-cobalt-manganese oxide positive electrode material and lithium metal as the experimental example 1 were used as the negative electrode, and 1.5% metastable polymer additive was used in the electrolyte (1.1M LiPF 6 EC / EMC / DEC), under the same conditions as Test 1 of Experimental Example 3, carry out the capacitance test (Test 2) at the high working voltage of the battery, and the results are shown in Figure 8 .

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Abstract

A composite electrode material of a lithium secondary battery and a lithium secondary battery are provided. The composite electrode material of the lithium secondary battery at least includes an electrode active powder and a nanoscale coating layer coated on the surface of the electrode active powder, wherein the nanoscale coating layer is composed of a metastable state polymer, a compound A, a compound B, or a combination thereof. The compound A is a monomer having a reactive terminal functional group, and the compound B is a heterocyclic amino aromatic derivative used as an initiator. The weight ratio of the nanoscale coating layer to the composite electrode material of the lithium secondary battery is 0.005% to 10%.

Description

technical field [0001] The present invention relates to a lithium secondary battery technology, and in particular to a lithium secondary battery composite electrode material and the lithium secondary battery. Background technique [0002] Due to the advantages of high energy density, high operating voltage, low self-discharge rate and long storage life, lithium secondary batteries have become a battery system that has attracted much attention in recent years, and are widely used in mobile phones, tablet computers, digital cameras, etc. Type (portable) electronic application products. The negative electrode of the early lithium battery used lithium metal, and the positive electrode was an intercalation compound of transition metal oxide (for example: Li x CoO 2 , Li x MnO 2 ), and the electrolyte is a non-aqueous organic electrolyte containing lithium ions. After several discharges, this kind of battery is prone to produce dendritic crystals on the negative electrode. Sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/052
CPCH01M4/366H01M4/602H01M10/052H01M4/38H01M4/505H01M4/525H01M4/5825H01M4/583Y02E60/10
Inventor 蔡丽端林月微方家振吴伟新谢登存
Owner IND TECH RES INST