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Positive electrode of hybrid capacitor, and preparation method and application thereof

A hybrid capacitor and positive electrode technology, which is applied to the positive electrode of the hybrid capacitor and the field of its preparation, can solve the problems such as the need for pre-lithiation treatment and the low energy density of carbon-based capacitors, so as to improve the high-power charging and discharging performance and meet the requirements of high-rate charging and discharging. , the effect of high application value

Active Publication Date: 2021-03-02
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode of the hybrid capacitor solves the problems of low energy density of carbon-based capacitors and the need for pre-intercalated lithium treatment on the negative electrode by improving the formula and process of the conventional positive electrode, improves the energy density and rate performance of the device, and can meet the -40°C- 125℃ high rate pulse discharge

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  • Positive electrode of hybrid capacitor, and preparation method and application thereof
  • Positive electrode of hybrid capacitor, and preparation method and application thereof

Examples

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Embodiment 1

[0074] This embodiment provides a positive electrode of a hybrid capacitor, the positive electrode includes a current collector, and a bonding layer and a positive electrode material layer sequentially located on the surface of the current collector; the composition of the bonding layer is a first binder (specifically composed of PTFE with a thickness of 1 μm), the positive electrode material layer includes a second binder (specifically composed of PVDF), a conductive agent, a positive electrode active material and a lithium-rich compound, and the conductive agent includes a first conductive agent and a second conductive agent. agent, the first conductive agent is graphite powder, the second conductive agent is a mixture of graphene and carbon nanotubes with a mass ratio of 1:4; the positive electrode active material is a mixture of activated carbon and lithium cobaltate; the lithium-rich compound is Li 2 NiO 2 ;

[0075] Wherein, the total mass fraction of the first binder l...

Embodiment 2

[0082] This embodiment provides a positive electrode of a hybrid capacitor, the positive electrode includes a current collector, and a bonding layer and a positive electrode material layer sequentially located on the surface of the current collector; the composition of the bonding layer is a first binder (specifically composed of PVDF with a thickness of 0.5 μm), the positive electrode material layer includes a second binder (specifically composed of PTFE), a conductive agent, a positive electrode active material and a lithium-rich compound, and the conductive agent includes a first conductive agent and a second conductive agent. Conductive agent, the first conductive agent is acetylene black, the second conductive agent is a mixture of graphene oxide and carbon nanotubes in a mass ratio of 2:3; the positive electrode active material is a mixture of graphene and lithium manganate; the lithium-rich compound is Li 3 N;

[0083] Wherein, the total mass fraction of the first bind...

Embodiment 3

[0090] This embodiment provides a positive electrode of a hybrid capacitor, the positive electrode includes a current collector, and a bonding layer and a positive electrode material layer sequentially located on the surface of the current collector; the composition of the bonding layer is a first binder (specifically composed of PFA, with a thickness of 5 μm), the positive electrode material layer includes a second binder (specifically composed of PFA), a conductive agent, a positive electrode active material and a lithium-rich compound, and the conductive agent includes a first conductive agent and a second conductive material. agent, the first conductive agent is SP, the second conductive agent is a mixture of graphene and carbon nanotubes with a mass ratio of 2:4; the positive active material is a mixture of activated carbon and NCM811; the lithium-rich compound is Li 2 O;

[0091] Wherein, the total mass fraction of the first adhesive layer and the second adhesive layer i...

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Abstract

The invention relates to a positive electrode of a hybrid capacitor, and a preparation method and application thereof. The positive electrode comprises a current collector, and a bonding layer and a positive electrode material layer which are sequentially located on the surface of the current collector, the bonding layer comprises a first bonding agent, and the positive electrode material layer comprises a second bonding agent, a conductive agent, a positive electrode active substance and a lithium-rich compound. The conductive agent comprises a first conductive agent and a second conductive agent, the first conductive agent comprises at least one of graphite powder, conductive carbon black or acetylene black, and the second conductive agent comprises at least one of a graphene material and a one-dimensional carbon material. In the positive electrode provided by the invention, the bonding layer improves the bonding capability of the current collector and the positive electrode materiallayer and reduces the internal resistance of the pole piece, and the conductive agent, the lithium-rich compound, the positive electrode active substance and other substances in the positive electrode material layer cooperate with each other to improve the energy density and rate capability of the positive electrode, and provide lithium ions to enter a negative electrode in the charging process,and pre-lithiation of the negative electrode is avoided.

Description

technical field [0001] The invention relates to the technical field of hybrid capacitors, in particular to a positive electrode of a hybrid capacitor and its preparation method and application. Background technique [0002] With the increasingly prominent energy and environmental issues, clean energy and renewable energy are widely researched and utilized. As a new type of high-efficiency energy storage element between conventional capacitors and secondary batteries, supercapacitors have received attention and research. Among them, carbon-based supercapacitors use carbon materials as the main electrode materials and are widely used. Activated carbon is one of the commonly used carbon materials, but the specific capacitance of activated carbon is generally between 25-35F / g, and the compacted density is only 0.5- 0.6g / m 2 , The energy density of a capacitor using pure activated carbon as an electrode is only 2-10Wh / kg, which is severely limited. In addition, the activated c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/24H01G11/28H01G11/30H01G11/38H01G11/86
CPCH01G11/50H01G11/24H01G11/28H01G11/30H01G11/38H01G11/86Y02E60/13H01G11/06H01G11/32H01M4/525H01M4/505H01M4/364H01M4/131H01M4/625H01M4/623
Inventor 罗垂意卜芳祝媛袁中直刘建华刘金成
Owner EVE ENERGY CO LTD
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