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Lithium lanthanum titanate composite material and preparation method thereof, and lithium ion solid state battery

A composite material and solid-state battery technology, which is applied in the manufacture of secondary batteries, non-aqueous electrolyte batteries, and electrolyte batteries, etc., can solve the problems of low total conductivity, achieve simple preparation process, improve total ion conductance, and high material density Effect

Active Publication Date: 2019-12-10
ZHENGZHOU NEW CENTURY MATERIALS GENOME INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium lanthanum titanate composite material, thereby solving the problem of low total conductivity of the existing lithium titanate lanthanum composite solid electrolyte

Method used

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  • Lithium lanthanum titanate composite material and preparation method thereof, and lithium ion solid state battery
  • Lithium lanthanum titanate composite material and preparation method thereof, and lithium ion solid state battery
  • Lithium lanthanum titanate composite material and preparation method thereof, and lithium ion solid state battery

Examples

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Embodiment 1

[0036] The lithium titanate lanthanum composite material of the present embodiment is made of Li 0.5 La 0.5 TiO 3 and Li 3 OCl is compounded, and the structure diagram is as follows figure 1 As shown, Li 3 OX is distributed at the grain boundary between lithium lanthanum titanate grains, and part of Li 3 OX also diffuses into the grains of lithium lanthanum titanate; Li 0.5 La 0.5 TiO 3 and Li 3 The mass ratio of OCl is 9.99:0.01.

[0037] The preparation method of the lithium lanthanum titanate composite material of the present embodiment adopts the following steps: 9.99gLi 0.5 La 0.5 TiO 3 and 0.01g Li 3 Grind and mix OCl, weigh 1g of the mixed powder, and press it into a tablet in a mold with a diameter of 16mm. The pressure during pressing is 20MPa, and the holding time is 2min. Lithium lanthanum titanate composite.

[0038] The lithium-ion solid-state battery of this embodiment has a structural schematic diagram as figure 2 As shown, it includes a positive...

Embodiment 2

[0044] The structure of the lithium lanthanum titanate composite material of this embodiment is basically the same as that of Example 1, the only difference being that Li 0.5 La 0.5 TiO 3 and Li 3 The mass ratio of OCl is 9.985:0.015.

[0045] The preparation method of the lithium lanthanum titanate composite material in this embodiment is prepared with reference to Example 1.

[0046] The lithium-ion solid-state battery of this embodiment was prepared with reference to Example 1.

Embodiment 3

[0048] The structure of the lithium lanthanum titanate composite material of this embodiment is basically the same as that of Example 1, the only difference being that Li 0.5 La 0.5 TiO 3 and Li 3 The mass ratio of OCl is 9.98:0.02.

[0049] The preparation method of the lithium lanthanum titanate composite material in this example is basically the same as that in Example 1, except that the calcination condition is 1100° C. for 7 hours.

[0050] The lithium-ion solid-state battery of this embodiment is basically the same as that of Embodiment 1, the only difference being that the thickness of the positive active material layer is 30 μm, and the active material layer is made of positive active material, conductive carbon black, PVDF and lithium lanthanum titanate composite material Composition, the mass ratio of each component is 91:3:3:3; the thickness of the solid electrolyte layer on the active material layer is 35 μm, and the mass ratio of lithium lanthanum titanate comp...

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Abstract

The invention relates to a lithium lanthanum titanate composite material and a preparation method thereof and a lithium ion solid state battery. The lithium lanthanum titanate composite material is formed by compounding Li3OX with an anti-calcium ore structure and lithium lanthanum titanate with a calcium ore structure. The Li3OX is distributed at grain boundaries between lithium lanthanum titanate grains and partially diffuses into the grains of lithium lanthanum titanate. The chemical formula of the lithium lanthanum titanate is Li3xLa2 / 3-xTiO3, 0 <x<0.16, and X is halogen in the Li3OX. According to the lithium lanthanum titanate composite material, the Li3OX with rich lithium phase and low melting point is adopted to perform cationic supplement for LLTO so as to change the disorder degree of carriers or cation vacancies in the grains, improve the ionic conductivity in the grains, compensate the consumption of the carriers in the space charge layer at the grain boundaries and effectively improve the grain boundary and whole ionic conductivity.

Description

technical field [0001] The invention belongs to the field of solid-state electrolytes, and in particular relates to a lithium-lanthanum titanate composite material, a preparation method thereof, and a lithium-ion solid-state battery. Background technique [0002] At present, commercial lithium-ion batteries generally use organic liquid electrolytes, which contain flammable and explosive organic electrolytes, and their own safety hazards limit the wide application of lithium-ion batteries. The lithium ion battery made by using inorganic solid electrolyte instead of liquid electrolyte and diaphragm not only simplifies the battery structure, but also can fundamentally solve its safety problem, and further improves the service temperature range and storage life of lithium ion battery. [0003] Nowadays, the researched solid electrolyte materials mainly include organic polymer electrolytes and inorganic solid electrolytes. Organic polymer electrolytes tend to work barely above r...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/058H01M2300/0071Y02E60/10Y02P70/50
Inventor 邵国胜胡俊华张金华曹六阳王茜
Owner ZHENGZHOU NEW CENTURY MATERIALS GENOME INST CO LTD
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