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Method for modifying electrode of lithium ion battery

A lithium-ion battery and modification technology, which is applied in the field of modification of lithium-ion battery electrodes, can solve the problems of easy falling off and inertization of microspheres, achieve stable charge and discharge capacity, and solve the problems of partial inertization and easy falloff of microspheres Effect

Inactive Publication Date: 2018-08-14
深圳市清新电源研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery electrode for the problem that the nano-scale conductive particles cannot effectively wrap the active microspheres in the lithium-ion battery electrode using a traditional binder, and the microspheres are partially inert and easy to fall off. modification method

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  • Method for modifying electrode of lithium ion battery
  • Method for modifying electrode of lithium ion battery
  • Method for modifying electrode of lithium ion battery

Examples

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Embodiment 1

[0022] Based on [70 (cobalt carbonate): 20 (acetylene black): 10 (PVDF), parts by weight] cobalt carbonate negative electrode sheet S0 (attached figure 1 ), the modification scheme provided by the present embodiment is: replace PVDF with PEDOT:PSS as binder, and the realization method is: after mixing cobalt carbonate microspheres and acetylene black with D50 of 5 μm, press the ratio of predetermined binder Add a PEDOT:PSS aqueous solution with a solid content of 5wt%, stir well and heat at 40°C to achieve a coatable viscosity, then coat a film on a copper foil and dry to obtain a modified electrode S1[70 (cobalt carbonate): 20 (acetylene black): 10 (PEDOT:PSS)] (see figure 2 , which includes microspheres 1, acetylene black 3 and adhesive 2).

Embodiment 2

[0024] Based on [70 (cobalt carbonate): 20 (acetylene black): 10 (PVDF), parts by weight] cobalt carbonate negative electrode sheet S0 (attached figure 1 ), the modification scheme provided in this embodiment is: coating a layer of PEDOT:PSS coating on the surface of the S0 pole piece. The implementation method is: on the surface of the coated and dried S0 pole piece, apply a thin layer (thickness of 50nm) of PEDOT:PSS aqueous solution with a solid content of 1.5wt% by scraping, and obtain PEDOT:PSS conductive Coated modified electrode S2 (see image 3 , which includes microspheres 1, adhesive 2 and conductive coating 3), wherein the thickness of the PEDOT:PSS conductive coating is in the range of 20-100nm.

Embodiment 3

[0026] Based on [70 (cobalt carbonate): 20 (acetylene black): 10 (PVDF), parts by weight] cobalt carbonate negative electrode sheet S0 (attached figure 1 ), the modified scheme provided in this embodiment is:

[0027] The first step is to use PEDOT:PSS instead of PVDF as the binder. The specific implementation method is: after mixing cobalt carbonate microspheres with a D50 of 5 μm and acetylene black, add a solid content of 5wt% according to the predetermined binder ratio PEDOT: PSS aqueous solution, fully stirred and heated at 40 °C to achieve a coating viscosity, then coated on copper foil, dried, and obtained modified electrode S1 [70 (cobalt carbonate): 20 (acetylene black): 10 ( PEDOT:PSS)].

[0028] The second step is to coat a layer of PEDOT:PSS conductive coating on the surface of the S0 pole piece. The specific implementation method is: on the surface of the S1 pole piece that has been coated and dried, apply a thin layer of solid content of 1.5wt% PEDOT:PSS aqueou...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for modifying an electrode of a lithium ion battery. The method is to modify the electrode of the lithium ion battery by adopting PEDOT:PSS (poly 3,4-ethylenedioxythiophene:polystyrene sulfonate), and the method includes the following steps: a modification step 1: taking PEDOT:PSS as a binder of the electrode; and / or a modification step 2: coating a layer of PEDOT:PSS on the surface of a coated pole piece. The two steps realize the smooth running of electrons on the surfaces of microspheres in different ways, so that the activity of each part of the microspheres is fully exerted, active materials can realize the theoretical charge and discharge capacity, and meanwhile, a conductive particle coating layer in the step 1 and PEDOT: PSS conductive coatings in the step 2 both immobilize the microspheres, the microspheres cannot be easily removed from the surface of the electrode, andthe electrode can achieve the stable charge and discharge capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for modifying electrodes of lithium ion batteries. Background technique [0002] The volume energy density and portability of the new generation of lithium-ion batteries are facing higher and higher requirements, which must be realized by electrode materials with high tap density, and high particle size can obtain high tap density. Lithium-ion battery electrode materials commonly used in battery factories at present: lithium cobaltate, NMC (nickel-manganese-cobalt ternary), lithium iron phosphate and lithium titanate obtained by some spray drying methods, the particle size is large, and the D50 is usually 8-12μm within range. At the same time, silicon anode materials with high energy density are sprinting, and some conversion anode materials often appear in the form of large particle size microspheres. Compared with the particle size of these ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M4/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/622H01M10/0525Y02E60/10
Inventor 丁昭郡张哲旭夏悦石玉磊
Owner 深圳市清新电源研究院
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