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Composite negative electrode of solid-state lithium battery and preparation method of composite negative electrode

A solid-state lithium and lithium negative electrode technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of poor conductivity and low safety, and achieve the effect of enhancing wettability and improving battery short circuit

Pending Publication Date: 2018-06-01
成都大超科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problems of low safety and poor electrical conductivity of the current lithium battery structure, the invention provides a solid lithium battery composite negative electrode with good wetting effect and high electrical conductivity of a solid electrolyte layer and a metal lithium negative electrode and a preparation method thereof

Method used

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  • Composite negative electrode of solid-state lithium battery and preparation method of composite negative electrode
  • Composite negative electrode of solid-state lithium battery and preparation method of composite negative electrode
  • Composite negative electrode of solid-state lithium battery and preparation method of composite negative electrode

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no. 1 example

[0027] see figure 2 , the first embodiment, a solid-state lithium battery composite negative electrode 10, including a solid electrolyte film layer 101 and a lithium negative electrode layer 102, the lithium negative electrode layer 102 includes a lithium metal negative electrode material, and the lithium metal negative electrode material is combined in a molten state A lithium negative electrode layer 102 is formed on the solid electrolyte film layer 101, and the solid electrolyte film layer 101 includes an electrolyte material. The electrolyte material includes garnet-structured Li 7 La 3 Zr 5 o 12 or the Li 7 La 3 Zr 5 o 12 The doping modified substance, the Li 7 La 3 Zr 5 o 12 The doping modifying element can be any one of Ca, Nb and Ta.

[0028] A method for preparing a composite negative electrode of a solid-state lithium battery. First, the electrolyte material is synthesized by a solid-phase synthesis method, and then a substrate is provided, and the elect...

no. 2 example

[0075] For a second example, see Figure 9 , a solid lithium battery composite negative electrode 20, including a solid electrolyte film layer 101 and a lithium negative electrode layer 102, the lithium negative electrode layer 102 and the solid electrolyte film layer 101 are melt-fitted, and the solid electrolyte film layer 101 includes an electrolyte material. A buffer layer 103 is also formed on the solid electrolyte film layer 101, the buffer layer 103 is located between the solid electrolyte film layer 101 and the lithium negative electrode layer 102, and the buffer layer 103 includes lithium-philic oxides, polymers Or gel electrolyte buffer layer material.

[0076] The formation method of the solid electrolyte film layer 101 in this embodiment is the same as that in the first embodiment, and includes the same electrolyte material as in the first embodiment.

[0077] read on Figure 9 , using the solid electrolyte thin film layer 101 as a base, depositing the buffer str...

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Abstract

The invention relates to the technical field of lithium batteries and in particular relates to a composite negative electrode of a solid-state lithium battery and a preparation method of the compositenegative electrode. The composite negative electrode of the solid-state lithium battery comprises a solid-state electrolyte thin film layer and a lithium negative electrode layer, wherein the lithiumnegative electrode layer comprises a lithium metal negative electrode material; the lithium metal negative electrode material is combined on the solid-state electrolyte thin film layer at a molten state to form the lithium negative electrode layer. The lithium metal negative electrode material is combined on the solid-state electrolyte thin film layer at the molten state to form the lithium negative electrode layer; the wetting performance between the lithium negative electrode layer and the solid-state electrolyte thin film layer can be improved very well and the formation of lithium dendritic crystals is inhibited very well; the safety performance of the lithium battery with a negative electrode structure is improved; meanwhile, the interface impedance between the lithium negative electrode layer and the solid-state electrolyte thin film layer is reduced very well, the migration rate of conductive ions between the lithium negative electrode layer and the solid-state electrolyte thinfilm layer is improved and the conductivity of the lithium negative electrode layer is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium batteries, in particular to a composite negative electrode of a solid lithium battery and a preparation method thereof. 【Background technique】 [0002] Before the commercialization of metal lithium batteries, there are great challenges in terms of safety and cycle stability for the metal lithium anode structure. see figure 1 , the wettability between the solid electrolyte layer 1011 and the metal lithium negative electrode layer 1021 is poor, lithium ions are deposited unevenly during the cycle, and lithium dendrites are easily generated during the charge-discharge cycle, resulting in a short circuit of the battery, which poses a serious safety hazard; At the same time, the contact between the solid electrolyte layer 1011 and the metal lithium negative electrode layer 1021 will form an interface layer with high impedance, thereby restricting the back and forth migration of lithium ions in the b...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/04
CPCH01M4/0423H01M4/0426H01M4/134H01M4/1395Y02E60/10
Inventor 张晓琨黄楷
Owner 成都大超科技有限公司
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