Negative electrode for lithium batteries

A lithium battery and negative electrode technology, applied in the field of rechargeable lithium batteries, can solve the problems of not improving performance and limiting reversible capacity

Inactive Publication Date: 2008-01-02
UMICORE AG & CO KG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to Fe 3+ / Fe 2+ conversion, the first discharge curve shows a plateau, which limits the reversible capacity, and with Li 2 Ti 3 o 7 Compared with the other performance

Method used

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  • Negative electrode for lithium batteries
  • Negative electrode for lithium batteries
  • Negative electrode for lithium batteries

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Embodiment Construction

[0021] Orthorhosite Li used as a negative electrode in lithium-ion batteries 2 Ti 3 o 7 The electrochemical properties are based on a single-phase intercalation mechanism of lithium ions without modification of the host compound. Such a mechanism requires good stability of the host network, vacancies for intercalation of lithium, and the presence of electrochemically active cations, in this case Ti 4+ . Li 2 Ti 3 o 7 The structure can be obtained from shared octahedra with channels in TiO 6 The edge and surface description of is partially occupied by lithium atoms (2 Li atoms for 7 O atoms) of the host element. These channels are easily filled by electrochemically intercalated lithium ions. The crystalline sites of titanium are not fully occupied, and the vacancies (0.5 vacancies for 7 O atoms) can be occupied by lithium of the host material. This description can be summarized as Li 2 Ti 3 o 7 The expansion of is:

[0022] (Li 2-x Vα 1.5+x ) channel (Ti 3 Li ...

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Abstract

An active material for high-voltage negative electrodes (>1V vs. Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula Li2+vTi3−WFeXMyM′ZO7−α, where M and M′ are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti3+, Co2+, Co3+, Ni2+, Ni3+, Cu2+, Mg2+, Al3+, In3+, Sn4+, Sb3+, Sb5+, α is related to the formal oxidation numbers n and n′ of M and M′ by the relation 2α=v+4w−3x−ny−n′z and the ranges of values are −0.5≰V≰0.5, 0≰w≰0.2, x>0, y+z>0 and x+y+z≰0.7. The structure is related to that of ramsdellite for all the compositions. The negative active material is prepared by ceramics process wherein lithium oxide, titanium oxide, iron oxide, M and / or M′ oxide are used as starting material for synthesis. Inorganic or organic solid precursors of the oxides can also be used instead. After reactant dispersion the mixture is fired. The resulting electrochemically active material provides low working voltage and capacity with excellent cycling capabilities at both low and high current densities.

Description

technical field [0001] The present invention relates to rechargeable lithium batteries. More specifically, the present invention relates to an active material for a negative electrode of a secondary rechargeable battery, wherein the active material is based on lithium titanoramite oxide having one or both of the following elements: Ti 3+ ,Co 2+ ,Co 3+ , Ni 2+ , Ni 3+ , Cu 2+ , Mg 2+ , Al 3+ , In 3+ , Sn 4+ , Sb 3+ , Sb 5+ . Improved performance, high energy, and high power factor for safety and the environment at reasonable cost. Background technique [0002] Negative active materials for rechargeable lithium batteries are usually selected from the carbon family. In these batteries, considerable efforts have been made to find alternative materials for electrochemically active anodes to replace graphite. Notably, due to the average voltage of about 1.5 V relative to Li, lithium titanium oxides such as the spinel phase Li mentioned in Journal of Electrochemical S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/40C01G23/00C01G49/00C01G53/00H01M4/02H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M4/58H01M10/05H01M10/052H01M10/0525H01M10/36
CPCH01M4/5825C01P2002/80C01P2002/77C01P2006/40H01M4/525H01M10/052C01G23/005C01P2002/54C01G53/006H01M4/485H01M10/0525H01M2004/027Y02E60/122C01P2002/72C01P2002/52C01G23/003H01M4/505Y10T29/49108Y02E60/10C01G49/009
Inventor 琼-克劳德·朱马斯乔塞特·奥列弗-富尔卡德皮埃尔-埃曼努埃尔·利庞劳伦特·阿尔东奥雷莉·皮卡德皮埃尔·库比亚克
Owner UMICORE AG & CO KG
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