High energy density lithium secondary battery electrode and preparation method thereof

A lithium secondary battery, high energy density technology, applied in the fields of electrochemistry, material chemistry and chemical power products, can solve the problems of reducing the relative content of electrochemical active materials, reducing the actual specific energy of the battery, etc. effect of life

Inactive Publication Date: 2010-01-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since these traditional conductive agents and binders are electrochemically inert substances, their addition must reduce the relative conte

Method used

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  • High energy density lithium secondary battery electrode and preparation method thereof

Examples

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Comparison scheme
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Embodiment 1

[0023] Example 1 First prepare 100ml of 0.1mol / L pyrrole Py acetonitrile solution, add 1g of carbon-coated lithium iron phosphate C-LiFePO 4 powder and 0.2 g of supporting electrolyte LiClO 4 , sonicated for half an hour to obtain a uniform suspension, and then the stainless steel mesh was used as the working electrode, and the counter electrode was placed in the suspension, and 0.1mA / cm was applied to the working electrode. 2 The constant current electrochemical polymerization was carried out at a current density of 1 hour. After 1 hour of polymerization, a uniform layer of PPy-coated C-LiFePO was obtained on the working electrode. 4 Composite film of C-LiFePO by differential thermal analysis 4 : PPy=84:16, directly use the working electrode as the positive electrode of the battery, the metal lithium sheet as the negative electrode, the polypropylene microporous membrane as the separator, and the 1mol / L LiPF 6 The / EC-DMC (1:1) solution was used as the electrolyte to assemb...

Embodiment 2

[0026] Example 2 First prepare 100ml of 0.01mol / L aniline in acetonitrile solution, then add 2g lithium titanate Li 4 Ti 5 o 12 Powder, 0.5g supporting electrolyte LiPF 6 , 0.02g conduction aid carbon black CB and 0.02g conduction aid graphite, 0.01g adhesion aid polytetrafluoroethylene PTFE, ultrasonically dispersed for 2 hours to obtain a uniform suspension, then foam nickel as a working electrode, and to The electrode was placed in the suspension, and cyclic voltammetric electrochemical polymerization was performed in the potential range of 1.3V to 0.1V (relative to the Ag / AgCl reference electrode). After 1.2 hours of reaction, a layer of polyaniline was evenly deposited on the working electrode. Coated Li 4 Ti 5 o 12 The film of Li was obtained by differential thermal analysis 4 Ti 5 o 12 : PPy: PTFE: (CB+graphite) = 93: 2: 2: 3, directly use this electrode as the working electrode of the battery, use the lithium metal sheet as the counter electrode of the battery,...

Embodiment 3

[0027] Embodiment 3 First prepare the acetonitrile solution of 100ml 0.2mol / L p-phenylene PP, add 1gLiMn 2 o 4 Powder, 0.2g supporting electrolyte LiClO 4 and 0.1g bonding aid polytetrafluoroethylene PTFE, ultrasonic vibration for 1 hour to obtain a uniform suspension, then the aluminum mesh was used as a working electrode, and the counter electrode was placed in the suspension, and 1.2 The potential of V (relative to the Ag / AlCl reference electrode) was subjected to potentiostatic electrochemical polymerization, and a uniform layer of polypyrrole-coated LiMn was obtained on the working electrode after polymerization for 0.5 hours. 2 o 4 Composite film of LiMn by differential thermal analysis 2 o 4 : PPy: PTFE = 70: 22: 8, directly use the working electrode as the working electrode of the battery, the lithium sheet as the negative electrode, the polypropylene microporous membrane as the separator, and the 1mol / L LiPF 6 / EC-DMC (1:1) solution is the electrolyte to assemble...

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Abstract

The invention discloses a high energy density lithium secondary battery electrode and a preparation method thereof. The electrode consists of current collector and active material layers adhered on the current collector. The active material layer is made from lithium-storage active material and conductive polymer material, and the mass ratio of the lithium-storage active material and the conductive polymer material is 100:0.1-40. In the invention, the conductive polymer material is adopted as main conductive agent and adhesive, compared with the conductive agent and adhesive of the traditional electrode, the electrode in the invention has high energy density due to that the conductive polymer material can provide a certain amount of reversible capacity for batteries by electrochemical doping and undoping reaction.

Description

technical field [0001] The invention relates to the technical fields of electrochemistry, material chemistry and chemical power supply products, in particular to a lithium secondary battery electrode and a preparation method thereof. Background technique [0002] With the increasingly widespread application of lithium secondary batteries in portable electronic fields such as mobile phones, laptop computers, and cameras, the advantages of high voltage, high specific energy, and long cycle life have attracted military, aerospace, electric vehicles, etc. High-tech applications of all ages. Whether it is for low-power applications of portable electronic products or high-power applications such as electric vehicles, further improving the energy density of batteries has always been one of the most important goals pursued by lithium secondary batteries. [0003] Fundamentally speaking, the battery energy density depends on the electrode material, but the influence of the battery p...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M10/36H01M10/40H01M4/36H01M4/62H01M4/58H01M4/38H01M4/04
CPCY02E60/12Y02E60/10
Inventor 黄云辉袁利霞张五星
Owner HUAZHONG UNIV OF SCI & TECH
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