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Lithium-ion secondary battery, negative electrode for lithium-ion secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device

A secondary battery and lithium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of battery characteristics degradation and achieve excellent battery characteristics

Active Publication Date: 2012-12-26
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, battery characteristics such as cycle characteristics tend to degrade

Method used

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  • Lithium-ion secondary battery, negative electrode for lithium-ion secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device
  • Lithium-ion secondary battery, negative electrode for lithium-ion secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device
  • Lithium-ion secondary battery, negative electrode for lithium-ion secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device

Examples

Experimental program
Comparison scheme
Effect test

experiment Embodiment 1-1 to 1-10

[0217] Produced by the procedure described below Figure 7 with Figure 8 The laminated film type secondary battery shown in .

[0218] The positive electrode 53 is formed. First, 91 parts by mass of positive electrode active material (LiCoO 2 ), 6 parts by mass of a positive electrode conductive agent (graphite), and 3 parts by mass of a positive electrode binder (polyvinylidene fluoride: PVDF) were mixed together to form a positive electrode mixture. The positive electrode mixture was dispersed in an organic solvent (N-methyl-2-pyrrolidone: NMP) to form a paste-like positive electrode mixture slurry. The positive electrode mixture slurry is then coated on both surfaces of the positive electrode current collector 53A using a coating device, and dried to form the positive electrode active material layer 53B. As the positive electrode current collector 53A, a strip-shaped aluminum foil (thickness: 12 μm) was used. Finally, the positive electrode active material layer 53B w...

experiment Embodiment 2-1 to 2-88

[0232] As shown in Table 2 to Table 5, secondary batteries were produced by the same procedure as in Experimental Examples 1-1 to 1-8 except that different types, ratios and combinations of M1 metals were used. The characteristics of each resulting secondary battery were examined. In this case, in order to carry out with powdered SiO y For co-deposition, other powdered metal M1 (such as Al) was used.

[0233] Table 2

[0234]

[0235] table 3

[0236]

[0237] Table 4

[0238]

[0239]

[0240] table 5

[0241]

[0242] As with the results shown in Table 1, high cycle retention, high initial efficiency, and high load retention were obtained even when using different types, ratios, and combinations of M1 metals.

experiment Embodiment 3-1 to 3-12

[0244] As shown in Table 6, secondary batteries were produced by the same procedure as in Experimental Examples 1-1 to 1-8 except that the negative electrode active material contained Li. The characteristics of each resulting secondary battery were examined. In this case, in order to carry out with powdered SiO y For co-deposition, an additional powdered metal M1(Li) was used. The anode active material used here contains Li in an uncharged state.

[0245] Table 6

[0246]

[0247] High cycle retention, high initial efficiency, and high load retention were obtained even when M1 contained Li. Furthermore, the initial efficiency is further increased when the anode active material contains SiM1O (SiLiO).

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Abstract

The invention provides a lithium-ion secondary battery, a negative electrode for the same and a battery. The lithium-ion secondary battery includes a positive electrode, a negative electrode containing an active material, and an electrolytic solution, in which the active material contains, as constituent elements, Si, O, and at least one element Ml selected from Li, C, Mg, Al, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Ge, Zr, Mo, Ag, Sn, Ba, W, Ta, Na, and K, and the atomic ratio x (O / Si) of O to Si is 0.5<=x<=1.8.

Description

technical field [0001] The present invention relates to a negative electrode for a lithium ion secondary battery, a lithium ion secondary battery including the negative electrode, a battery pack including the secondary battery, an electric vehicle, a power storage system, an electric tool, and an electronic device, the negative electrode Contains negative electrode active materials capable of occluding and releasing lithium ions. Background technique [0002] In recent years, electronic devices typified by, for example, cellular phones and personal digital assistants (PDAs) have been widely used. Also, size and weight reduction and longer lifespan of electronic devices have been strongly demanded. Therefore, the development of batteries used as power sources, especially small and lightweight secondary batteries with high energy density, has been promoted. Recently, application of secondary batteries to various applications such as battery packs, electric vehicles such as e...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/131H01M10/0525
CPCH01M4/5825Y02E60/122H01M4/485Y02E60/10
Inventor 广濑贵一川濑贤一西寿朗小泉公
Owner MURATA MFG CO LTD
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