Novel sulfur-containing lithium ion battery cathode material

A technology for lithium-ion batteries and positive electrode materials, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve problems such as incompatibility of positive electrode materials

Inactive Publication Date: 2015-11-11
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a new positive electrode material for lithium-ion batteries containing S. In order to solve the problem of incompatibility between solid electrolytes containing S and existing positive electrode materials for lithium-ion batteries, a new positive electrode for lithium-ion batteries containing S is proposed. Material

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  • Novel sulfur-containing lithium ion battery cathode material
  • Novel sulfur-containing lithium ion battery cathode material
  • Novel sulfur-containing lithium ion battery cathode material

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Embodiment 1

[0023] LiGaS 2+LGPS+Li constitutes an all-solid-state lithium-ion battery. Using LiGaS 2 The material is used as the positive electrode, the LGPS material is used as the electrolyte, and the metal Li is used as the negative electrode of the battery system. Compared to LiCoO 2 When the oxide is used as the positive electrode, since the sulfur in LGPS is much less attractive to lithium ions than the oxygen in the oxide, when the two are in contact, the lithium ions in the LGPS electrolyte will automatically migrate to the oxide electrode and form on the surface of the electrolyte. A lithium-poor thin layer is formed, which will seriously hinder the migration of lithium ions. with LiGaS 2 Using the material as the positive electrode avoids this problem. In addition, for all-solid-state lithium-ion batteries, lithium can be directly used as the negative electrode, and the energy density of the battery will increase accordingly.

Embodiment 2

[0025] LiGaS 2 +LGSP+graphite forms an all-solid-state lithium-ion battery. Using LiGaS 2 The material is used as the positive electrode, the LGPS material is used as the electrolyte, and the graphite is used as the negative electrode for the battery system. Similar to Example 1, LiGaS 2 Compatibility with LGPS solid electrolyte is good. In addition, the solid electrolyte avoids the damage to the graphite structure of the negative electrode when the traditional liquid organic electrolyte is charged, and reduces some troubles in the battery manufacturing process.

Embodiment 3

[0027] LiGaS 2 +LiPF 6 + Graphite makes up lithium-ion batteries. Using LiGaS 2 material as the positive electrode, LiPF 6 The mixed solvent dissolved in EC and DMC is used as the electrolyte, and the graphite is used as the negative electrode of the battery system. so LiGaS 2 Used in today's liquid electrolyte Li-ion batteries, from LiGaS 2 From the perspective of the theoretical specific capacity, theoretical energy density, lithium ion transport and electronic conductivity of the material, the comprehensive performance of the battery is good.

[0028] Table 1: LiGaS 2 And the lattice constants a, b, c (units are Angstrom) of the unit cell corresponding to the completely de-Li state, the volume volume (unit is cubic Angstrom), the corresponding volume reduction percentage ΔV / V after completely de-Li, Ga -S key length d Ga-S (unit is Angstrom), S-Ga-S bond angle θ S-Ga-S .

[0029]

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Abstract

The invention relates to a novel sulfur-containing lithium ion battery cathode material, which is a ternary sulfide and has the molecular formula of LiGaS2 (Li is lithium, Ga is gallium and S is sulfur). The novel sulfur-containing lithium ion battery cathode material is 190.39 mAh/g is theoretical specific capacity, is about 3.50 V in lithium intercalation voltage and reaches 665.61 W*h/kg in theoretical energy density as a lithium ion battery cathode material. The LiGaS2 material is excellent in structural stability during a lithium intercalation/extraction process, thereby ensuring excellent charge-discharge rate capability. The LiGaS2 is expected for being used as a cathode material in a lithium ion battery, and especially being used in an all-solid lithium ion battery prepared from a solid electrolyte containing sulfur. The LiGaS2 has an important significance since no excellent cathode material is matched with the solid electrolyte.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials and technology, in particular to a positive electrode material used in an all-solid lithium ion battery and a lithium ion battery containing the positive electrode material. Background technique [0002] Fossil energy has been over-exploited and utilized, coupled with the increasing demand for energy in modern society, the development of new energy is becoming more and more urgent. Although the development of new energy sources such as solar energy, wind energy, hydropower, nuclear energy, geothermal energy, and ocean energy has reduced society’s dependence on fossil energy to a certain extent, the problem is that these new energy sources do not have the excellent mobility of traditional fossil energy. In the situation where people are accustomed to relying on this mobility convenience, converting new energy into a mobile form of energy is the key to solving the problem. Therefore, ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5815H01M10/0525Y02E60/10
Inventor 宁芳华肖建茂徐波刘刚吴木生欧阳楚英
Owner JIANGXI NORMAL UNIV
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