STABILITY OF LITHIUM ION SPINEL CELLS. PT.3. IMPROVED LIFE OF CHARGED CELLS

STABILITY OF LITHIUM ION SPINEL CELLS. PT.3. IMPROVED LIFE OF CHARGED CELLS

Irreversible capacity losses in lithium ion manganese spinel cells during 60 C storage were investigated in the charged state and a mechanism proposed based on acid generation to explain the origin of irreversible loss. Various approaches such as surface, structural, electrode formulation, and elect...

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Veröffentlicht in:Journal of the Electrochemical Society 2000-01, Vol.147 (11), p.4023-4028
Hauptverfasser: Wang, E, Ofer, D, Bowden, W, Iltchev, N, Moses, R, Brandt, K
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container_issue 11
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container_title Journal of the Electrochemical Society
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creator Wang, E
Ofer, D
Bowden, W
Iltchev, N
Moses, R
Brandt, K
description Irreversible capacity losses in lithium ion manganese spinel cells during 60 C storage were investigated in the charged state and a mechanism proposed based on acid generation to explain the origin of irreversible loss. Various approaches such as surface, structural, electrode formulation, and electrolyte modification were applied to address the instability issue. Based on an understanding of the mechanism, a method of coating the spinel surface with a carbonate layer was developed to minimise the detrimental effect of acid generation in cells. As a result, irreversible losses were reduced from > 70% after 4 weeks of storage at 60 C to about 20%. 23 refs.
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title STABILITY OF LITHIUM ION SPINEL CELLS. PT.3. IMPROVED LIFE OF CHARGED CELLS
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