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Chromium-doped lithium titanate as cathode material

A cathode material, chromium doping technology, applied in the direction of titanate, alkali metal titanate, positive electrode, etc., can solve problems such as limited conductivity, improve safety, improve capacity reversibility, and high dimensional stability Effect

Inactive Publication Date: 2016-05-25
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although undoped lithium titanate has some lithium ion conductivity, it has only a very limited conductivity

Method used

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  • Chromium-doped lithium titanate as cathode material
  • Chromium-doped lithium titanate as cathode material
  • Chromium-doped lithium titanate as cathode material

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Embodiment Construction

[0067] A. Solid Synthesis

[0068] 1. Chromium-doped lithium titanate particles: Li with x=0.1, 0.2, 0.4, 0.7 and 0.9 4-x Ti 5-2x Cr 3x O 12 solid synthesis

[0069] Synthesis of a series of chemical formula Li by means of solid synthesis especially of ceramics 4-x Cr 3x Ti 5-2x O 12 of chromium-doped lithium titanate with x = 0.1, 0.2, 0.4, 0.7 and 0.9.

[0070] Here, lithium carbonate (Li 2 CO 3 ), titanium dioxide (TiO 2 ) and chromium (III) oxide (Cr 2 O 3 ) was mixed with 40 ml of isopropanol and ground with a ball mill with zirconium dioxide balls at 150 rpm for 2 hours and then dried at 70° C. by means of a rotary evaporator. The residue is then calcined in air at 800°C in a furnace. After roasting and furnace cooling, samples were taken and ground by hand. The resulting product was green.

[0071] 2. Chromium-doped lithium titanate particles with oxygen vacancies: Li with x = 0.2 and 0.4 4-x Ti 5-2x Cr 3x O 12-δ solid synthesis

[0072] Synthesis 2...

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Abstract

A cathode material for a lithium cell, in particular a lithium-sulfur cell. To improve the rate properties of the cell, the cathode material includes a chromium-doped lithium titanate, in particular of the general chemical formula: Li4-xTi5-2xCr3xO12-[delta], where 0<x<0.6 applies, [delta] denotes oxygen vacancies, and 0<=[delta] applies. Also described is a corresponding chromium-doped lithium titanate, a method for the manufacture thereof, and a lithium cell and / or battery equipped therewith.

Description

technical field [0001] The present invention relates to cathode materials suitable for lithium-batteries, chromium-doped lithium titanates and methods for their preparation, as well as lithium-batteries and / or accumulators equipped with such materials. Background technique [0002] Undoped lithium titanate (Li 4 Ti 5 O 12 , LTO) can be used as so-called anode material in the negative electrode (also called anode) of lithium-ion-batteries. [0003] Undoped lithium titanate is described as a typical spinel structure (A 2+ B 3+ O 4 2- ), in particular also described as Li(Li 1 / 3 Ti 5 / 3 )O 4 form. Undoped lithium titanate has a cubic unit cell of space group Fd-3m with lattice constant a of 8.35950Å. where the 8a-tetrahedral site and the 16d-octahedral site are composed of Li + -Ions partially occupy sites, while all Ti 4+ - ions and the rest of Li + - the ions are localized at the 16d-octahedral site. [0004] Undoped lithium titanate has a certain lithium ion co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131C01G23/04
CPCC01G23/04H01M4/131C01G23/005C01G37/006C01P2002/32C01P2002/54C01P2002/77C01P2006/40H01M4/485H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor P.弗马T.埃克尔
Owner ROBERT BOSCH GMBH
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