Solid electrolyte, lithium metal negative electrode and preparation method thereof

A technology of solid electrolytes and electrolytes, applied in solid electrolytes, composite electrolytes, non-aqueous electrolytes, etc., can solve problems such as complex operations, achieve the effects of increasing diffusion speed, excellent electrochemical performance, and improving electrochemical performance

Active Publication Date: 2021-11-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of the lithium metal negative electrode has the disadvantages of complex operation and the introduction of some non-conducting lithium ion materials.

Method used

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  • Solid electrolyte, lithium metal negative electrode and preparation method thereof
  • Solid electrolyte, lithium metal negative electrode and preparation method thereof
  • Solid electrolyte, lithium metal negative electrode and preparation method thereof

Examples

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preparation example Construction

[0036] The invention provides a method for preparing a solid electrolyte, comprising the following steps:

[0037] S1. Preparation of lithium lanthanum titanyl oxide: according to a predetermined ratio, prepare the first reaction system of lithium nitrate, lanthanum nitrate, tetrabutyl titanate and citric acid, and conduct hydrothermal treatment on the first reaction system at 160-200°C Reaction for 8-16 hours; after the hydrothermal reaction is completed, the first reaction product produced by the reaction is dried and pyrolyzed, and then calcined at 800-1000°C for 1-4 hours to prepare lithium lanthanum titanium oxide particles;

[0038] S2, preparation of solid electrolyte: prepare a second reaction system of 2,4-toluene diisocyanate and polypropylene oxide according to a predetermined ratio, and place the lithium lanthanum titanyl oxide particles prepared in step S1 in the second reaction system , stirring at a temperature of 50-80°C for 3-8 hours to react; then pour the se...

Embodiment 1

[0053] The preparation of solid LLTO / LPU composite polymer electrolyte (CPPE) comprises the following steps:

[0054] S1, Synthesis of lithium lanthanum titanyl oxide (LLTO) particles:

[0055] 1) Dissolve lithium nitrate, lanthanum nitrate, tetrabutyl titanate and citric acid in absolute ethanol at a molar ratio of 0.33:0.557:1.00:0.887 to obtain lithium nitrate solution, lanthanum nitrate solution, and tetrabutyl titanate Solution and citric acid solution; Wherein, citric acid is used as complexing agent;

[0056] 2) Mix the lithium nitrate solution, the tetrabutyl titanate solution and the citric acid solution evenly to obtain a first mixed solution; then add the lanthanum nitrate solution dropwise under mechanical stirring at 80°C;

[0057] 3) After the lanthanum nitrate solution is added dropwise, stir for 30 minutes to obtain a white suspension and prepare the first reaction system;

[0058] 4) Pour the first reaction system into a 200mL reactor at 180°C, and perform a...

Embodiment 2-3

[0104] The difference from Example 1 is that the mass ratio of lithium lanthanum titanyl oxide particles (LLTO) to linear polyurethane (LPU) is set differently, and the others are the same as in Example 1, and will not be repeated here.

[0105] Table 1 is process parameter setting and its performance parameter in embodiment 1-3

[0106] Example LLTO to LPU mass ratio Ionic conductivity Example 1 1:10 5.0×10 -4 S cm -1

[0107] Combined with Table 1 for analysis: the effect of the mass ratio of lithium lanthanum titanium oxide particles (LLTO) to linear polyurethane (LPU) on the electrochemical performance of solid electrolyte CPPE is: when the mass ratio of LLTO to LPU is set to 1:10, the prepared The solid electrolyte has the highest ionic conductivity and has excellent electrochemical performance.

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Abstract

The invention provides a solid electrolyte, a lithium metal negative electrode and a preparation method thereof. The solid electrolyte is a composite polymer electrolyte composed of lithium lanthanum titanium oxide and linear polyurethane. The preparation method is as follows: firstly, lithium lanthanum titanyl oxide particles with complete crystalline phase are prepared by combining hydrothermal synthesis and high-temperature calcination; then, lithium lanthanum titanyl oxide particles and linear polyurethane are blended and stirred, and solvent evaporation is performed , to prepare a solid electrolyte. The lithium ion conductivity of the solid electrolyte prepared by the present invention at room temperature reaches 3.8×10 ‑4 S cm ‑1 . At the same time, the battery assembled with this solid electrolyte exhibits excellent cycle performance and excellent specific capacity at room temperature. In the invention, the lithium metal negative electrode can be obtained by combining the solid electrolyte and the lithium metal sheet.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a solid electrolyte, a lithium metal negative electrode and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have played an important role in people's production and life. It has high energy density, portability, and long service life, and has a wide range of applications. With the rapid development of electronic products towards portability and miniaturization, all-solid-state thin-film lithium-ion batteries have emerged. All-solid-state thin-film lithium-ion batteries have the advantages of small size, high energy density, long cycle life, and good safety. The performance is largely determined by the solid electrolyte film. The solid electrolyte film is equivalent to the electrolyte and separator in the traditional battery, which not only plays the role of Li + Conduction also has a direct impact on the capacity an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082H01M2300/0085H01M2300/0088Y02E60/10
Inventor 曹元成涂吉楼平李程张炜鑫
Owner HUAZHONG UNIV OF SCI & TECH
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