Preparation method of modified cathode material of lithium ion battery and battery applying same

A technology of lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., to improve safety performance and cycle performance, and reduce side reactions

Inactive Publication Date: 2010-09-08
GUANGDONG BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported coating methods and materials mainly include lithium carbonate, aluminum oxide, aluminum phosphate, magnesium oxide, zirconium oxide, tin oxide, silicon oxide

Method used

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  • Preparation method of modified cathode material of lithium ion battery and battery applying same
  • Preparation method of modified cathode material of lithium ion battery and battery applying same
  • Preparation method of modified cathode material of lithium ion battery and battery applying same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The vinylidene fluoride and hexafluoropropylene copolymer were dissolved in acetone, and the temperature was kept at 40 ° C, then the industrially produced conventional lithium cobalt oxide matrix material was added, and stirred for 1 h, and then solid-liquid separation was carried out. Bake in an oven at ℃ for 12 h to obtain a lithium cobalt oxide modified cathode material.

[0018] The performance of the material was tested with a 053450 type polymer battery. The conventional lithium cobalt oxide and lithium cobalt oxide modified materials were used as the cathode active material, the anode was made of acicular artificial graphite, and the electrolyte was made of PE / PP / PE three-layer microporous membrane. , the electrolyte adopts 1MLiPF 6 / EC:EMC:DEC=1:1:1 system in which dibutyl phthalate was added as plasticizer and azobisisobutyronitrile as initiator. After the vacuum packaging of the battery using the modified cathode material, under the conditions of a temperatu...

Embodiment 2

[0026] The homopolymer of ethylene oxide and propylene oxide with a molecular weight of 30,000 was dissolved in ethyl formate, and the temperature was kept at 50 ° C, and then the conventional industrially produced LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 The base material was added and stirred for 2 hours, and then solid-liquid separation was carried out. The solid phase was baked in an oven at 110 °C for 12 hours to obtain LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 Modified cathode material.

[0027] The performance of the material was tested with a polymer battery of type 053450, and the conventional LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 and LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 The modified material is the cathode active material, the anode adopts acicular artificial graphite, the electrolyte adopts PE / PP / PE three-layer microporous membrane, and the electrolyte adopts 1MLiPF 6 / EC:EMC:DEC=1:1:1 system and adding dioctyl phthalate as plasticizer, dicumyl peroxide as initiator and cyclohexylbenzene functional add...

Embodiment 3

[0035] The copolymer of vinylidene fluoride and hexafluoropropylene, and the copolymer of ethylene oxide and propylene oxide with a molecular weight of 30,000 were dissolved in tetrafluorohydrofuran, and the temperature was kept at 60 ° C, and then the industrially produced conventional LiNi 0.75 Co 0.20 Al 0.05 O 2 The base material was added and stirred for 1 hour, and then solid-liquid separation was carried out. The solid phase was baked in an oven at 100 °C for 12 hours to obtain LiNi 0.75 Co 0.20 Al 0.05 O 2 Modified cathode material.

[0036] The performance of the material was tested with a polymer battery of type 053450, and the conventional LiNi 0.75 Co 0.20 Al 0.05 O 2 and LiNi 0.75 Co 0.20 Al 0.05 O 2 The modified material is the cathode active material, the anode adopts acicular artificial graphite, the electrolyte adopts PE / PP / PE three-layer microporous membrane, and the electrolyte adopts 1MLiPF 6 / EC:EMC:DEC=1:1:1 system in which n-octyl-n-decyl a...

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Abstract

The invention discloses a preparation method of a modified cathode material of a lithium ion battery and a battery applying the same. The invention is mainly characterized by taking lithium metal oxide which can be represented by using the general formula LiAl-xBxO2 of a molecular formula and has a laminar structure as a matrix of the modified cathode material. The surface of the matrix of the cathode material is coated with a layer of porous organic polymer for modification, and the organic polymer is a copolymer of vinylidene fluoride and hexafluoropropylene, or/and a homopolymer or a copolymer of ethylene oxide and propylene oxide. The modified cathode material in the lithium ion battery generates a reaction with a solvent in electrolyte or under the action of an additive to form a gelatinous dielectric layer. The modified cathode material is suitable for various lithium ion batteries and is especially suitable for polymer type lithium ion batteries.

Description

Technical field: [0001] The invention belongs to new energy materials and lithium ion batteries in the new energy field, and more particularly relates to the preparation of cathode materials for lithium ion batteries and a battery using the modified cathode materials. technical background: [0002] Since its commercialization, lithium-ion batteries have been widely used due to their high energy density, light weight, long life and no memory. At present, commercial lithium-ion batteries mainly use LiCoO 2 and LiNi 1-x-y Co x Mn y O 2 Cathode materials, and these materials have obvious defects in structural stability and safety performance under deep charge and discharge conditions. With the popularization of communication tools and digital electronic products such as mobile phones, notebook computers, digital cameras, MP4&5, PDAs, Bluetooth headsets, etc., the market demand for lithium-ion batteries has grown by leaps and bounds. By 2008, the global annual demand for lit...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M10/0525H01M10/056
CPCY02E60/122Y02E60/10
Inventor 李长东唐红辉黄国勇
Owner GUANGDONG BRUNP RECYCLING TECH
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