US5084366A
Expired / Lapsed
US
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Non-aqueous electrolyte secondary cell
Assignee: Panasonic Holdings Corp
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Filing: 1990-03-30
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Granted: 1992-01-28
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Expires: 2010-03-30
Abstract
Abstract A non-aqueous electrolyte secondary cell comprises a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the general formula, Li x M y Mn.sub.(2-y) O 4 , wherein M is at least one selected from the group consisting of Co, Cr, Fe and the like, 0.85≦x<1.15, and 0.02≦y≦0.3. The positive electrode active material in a charged state has a composition represented by the general formula, Li x M y Mn 2 (-y) O 4 , wherein x≦0.7, owing to the extraction of lithium ions from the positive electrode active material on charging. The non-aqueous electrolyte secondary cell has an improved cycle life.
Inventors
- 👤 Yoshinori Toyoguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:06
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/485; H01M10/00; H01M10/05; H01M10/052; H01M4/50; H01M4/505; H01M4/58; H01M4/52; H01M4/525; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A non-aqueous electrolyte secondary cell comprising a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 , wherein M is at least one selected from the group consisting of Co, Cr and Fe, x≦0.7 and 0.02≦y≦0.3 under charging, said positive electrode active material in a charged state having the composition represented by the general formula, Li x M y Mn.sub.(2-y) O 4 , wherein x=0.7, owing to the extraction of lithium ions from said positive electrode active material on charging.
Claim 2
Dependent Claim
115 words
A non-aqueous electrolyte secondary cell comprising a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 , wherein M is at least one selected from the group consisting of Co, Cr and Fe, x≦0.7 and 0.02≦y≦0.3 under charging, said positive electrode active material in a charged state having the composition represented by the general formula, Li x M y Mn.sub.(2-y) O 4 , wherein x=0.7, owing to the extraction of lithium ions from said positive electrode active material on charging.
Claim 3
Dependent Claim
102 words
A non-aqueous electrolyte secondary cell comprising a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 wherein M is Co, x≦0.7, and 0.02≦y<0.3 under charging, said positive electrode active material in a charged state having the composition represented by the general formula, Li x M y Mn.sub.(2-y) O 4 , wherein x≦0.7, owing to the extraction of lithium ions from said positive electrode active material on charging.
Claim 4
Dependent Claim
102 words
A non-aqueous electrolyte secondary cell comprising a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 wherein M is Co, x≦0.7, and 0.02≦y<0.3 under charging, said positive electrode active material in a charged state having the composition represented by the general formula, Li x M y Mn.sub.(2-y) O 4 , wherein x≦0.7, owing to the extraction of lithium ions from said positive electrode active material on charging.
Claim 5
Dependent Claim
112 words
A non-aqueous electrolyte secondary cell comprising a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 , wherein M is at least one element selected from the group consisting of Cr and Fe, x≦0.7, and 0.02≦y≦0.3 under charging, said positive electrode active material in the charged state having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 , owing to the extraction of lithium ions from said positive electrode active material on charging.
Claim 6
Dependent Claim
112 words
A non-aqueous electrolyte secondary cell comprising a negative electrode composed of at least one selected from the group consisting of lithium and lithium compounds, a non-aqueous electrolyte containing a lithium salt, and a positive electrode active material having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 , wherein M is at least one element selected from the group consisting of Cr and Fe, x≦0.7, and 0.02≦y≦0.3 under charging, said positive electrode active material in the charged state having a composition represented by the formula, Li x M y Mn.sub.(2-y) O 4 , owing to the extraction of lithium ions from said positive electrode active material on charging.
References Cited (Backward Citations)
FR2528238A1
Cited
US4507371A
Cited
JPS61239563A
Cited
EP0279235A1
Cited
US4904552A
Cited
JPH0260056A
Cited
US4956248A
Cited
JPH02139861A
Cited
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