Lithium titanium sulfide, lithium niobium sulfide, and lithium titanium niobium sulfide

一种硫化物、锂钛的技术，应用在钛化合物、铌化合物、无机化学等方向，能够解决铌硫化物少、尚无材料开发例、无报告等问题，达到结构稳定化、充电容量优异、充放电电位优异的效果

Active Publication Date: 2015-12-23
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reported examples of the development of such materials
[0010] Furthermore, there are few reports on lithium-containing niobium sulfides, and there are no reports on high-capacity materials in particular.

Method used

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  • Lithium titanium sulfide, lithium niobium sulfide, and lithium titanium niobium sulfide
  • Lithium titanium sulfide, lithium niobium sulfide, and lithium titanium niobium sulfide
  • Lithium titanium sulfide, lithium niobium sulfide, and lithium titanium niobium sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0223] [Example 1: Li 2 TiS 3 Synthesis of powder]

[0224] Weigh and mix commercially available lithium sulfide (Li 2 S) powder, and titanium disulfide (TiS 2 ) powder, and then use a 45mL container with about 500 zirconia balls with a diameter of 4mm, and perform a mechanical grinding process at 510rpm for 20 to 100 hours with a ball mill (FritschP7, Classicline), thereby obtaining Li 2 TiS 3 powder.

Embodiment 2

[0225] [Example 2: Li 2.33 TiS 3.33 Synthesis of powder]

[0226] Weigh and mix commercially available lithium sulfide (Li 2 S) powder, titanium disulfide (TiS 2 ) powder and sulfur (S) powder, and then use a 45mL container with about 500 zirconia balls with a diameter of 4mm to carry out mechanical grinding at 510rpm for 40 hours with a ball mill (FritschP7, Classicline), thereby obtaining Li 2.33 TiS 3.33 powder.

Embodiment 3

[0227] [Example 3: Li 3 TiS 4 Synthesis of powder]

[0228] Weigh and mix commercially available lithium sulfide (Li 2 S) powder, titanium disulfide (TiS 2 ) powder and sulfur (S) powder, and then use a 45mL container with about 500 zirconia balls with a diameter of 4mm to carry out mechanical grinding at 510rpm for 40 hours with a ball mill (FritschP7, Classicline), thereby obtaining Li 3 TiS 4 powder.

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Abstract

Provided is a novel lithium titanium sulfide, lithium niobium sulfide, or lithium titanium niobium sulfide endowed with the excellent charge / discharge performance (especially the excellent charge / discharge capacity and charge / discharge potential) useful for a positive electrode active material or the like for a lithium battery such as a metal lithium secondary battery or a lithium ion secondary battery by a sulfide containing lithium, titanium and / or niobium, and sulfur as constituent elements. Particularly preferred are (1) lithium titanium sulfide containing lithium, titanium, and sulfur as constituent elements and having a cubic rock-salt crystal structure, (2) lithium niobium sulfide containing lithium, niobium, and sulfur as constituent elements and having a diffraction peak at a specific position in an x-ray diffractogram, (3) lithium titanium niobium sulfide containing lithium, titanium, niobium, and sulfur as constituent elements and having a diffraction peak at a specific position in an x-ray diffractogram, or the like.

Description

technical field [0001] The present invention relates to a lithium titanium sulfide, a lithium niobium sulfide, a lithium titanium niobium sulfide, a method for producing the sulfide, and a lithium battery using the sulfide. Background technique [0002] Due to the improvement in performance of portable electronic devices, hybrid vehicles, etc. in recent years, there has been an increasing demand for higher capacity of secondary batteries (especially lithium batteries) used therein. However, in current lithium secondary batteries, the increase in the capacity of the positive electrode is slower than that of the negative electrode, and even a relatively high-capacity lithium nickelate-based material is only about 190 to 220 mAh / g. [0003] Metal sulfides have a high theoretical capacity. Regarding titanium sulfides known as electrode materials for lithium secondary batteries, reports indicate that TiS 2 and TiS 3 Discharge capacities of about 240 mAh / g and 350 mAh / g were sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G33/00H01M4/58H01M10/052H01M10/0569
CPCH01M10/052C01G23/002C01G33/006C01P2002/72C01P2004/61H01M10/0525H01M4/5815Y02E60/10Y02T10/70H01M10/0569H01M2004/028
Inventor 作田敦竹内友成荣部比夏里辰巳国昭
Owner NAT INST OF ADVANCED IND SCI & TECH
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