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Non-aqueous electrolyte cells and batteries

A non-aqueous electrolyte and battery technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of increased surface resistance and decreased life performance, and achieve the effect of improving life performance

Active Publication Date: 2016-02-10
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dissolved substances are precipitated on the surface of the negative electrode, causing the surface resistance to increase
Therefore, as the resistance increases, the battery capacity, especially the life performance, decreases

Method used

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  • Non-aqueous electrolyte cells and batteries
  • Non-aqueous electrolyte cells and batteries
  • Non-aqueous electrolyte cells and batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122]

[0123] 90% by mass of lithium manganese oxide (LiMn 2 o 4 ) powder as an active material, 3% by mass of acetylene black and 3% by mass of graphite as a conductive agent and 4% by mass of polyvinylidene fluoride as a binder were added to N-methylpyrrolidone (NMP), and mixed to Prepare the slurry. The slurry was coated on both sides of a current collector made of aluminum foil with a thickness of 15 μm, then dried and pressed to prepare an electrode with a density (density of the positive electrode layer) of 3.0 g / cm 3 positive pole.

[0124]

[0125] The prepared average particle size is 0.84μm, BET specific surface area is 10.8m 2 / g, and the lithium absorption potential is 1.55V (vs.Li / Li + ) spinel lithium titanate (Li 4 Ti 5 o 12 ) powder as the active material. The particle diameter of the active material was measured using a laser diffraction type distribution testing device (SALD-300, Shimadzu Corporation). That is, add about 0.1 g of sample, surfac...

Embodiment 11-16

[0140] A non-aqueous electrolyte secondary battery was prepared in the same manner as described in Example 1, except that the compounds in Table 2 below were used as the phosphorus compound contained in the non-aqueous electrolyte instead of H 3 PO 4 .

[0141] The batteries obtained in Examples 11-16 were subjected to a high-temperature storage test in the same manner as described in Example 1. The resistance rise rate is determined by the equation X=R1 / R2. The results are shown in Table 2 below. The results of Comparative Example 1 are also shown in Table 2 below.

[0142] Table 2

[0143]

[0144] As is clear from Table 2, it is found that for the use of A x h 3-x PO 4 ;(A=Na,K) and A' y h (6-2y) (PO 4 ) 2 (A'=Mg, Ca) is used as the non-aqueous electrolyte secondary battery of the embodiment 11-16 of the phosphorus compound contained in the non-aqueous electrolyte, and its effect of suppressing the resistance rise is higher than using the non-aqueous electrolyte...

Embodiment 31-38

[0158] A nonaqueous electrolyte secondary battery was prepared in the same manner as described in Example 1 except that the phosphorus compound shown in Table 4 was contained in the negative electrode in the amount shown in Table 4.

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Abstract

According to one embodiment, a nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode contains an active material having a lithium absorption potential of not lower than 0.4 V vs. Li / Li+. The nonaqueous electrolyte contains a fluorine-containing lithium salt and a phosphorous compound. The phosphorous compound is at least one selected from the group consisting of AxH3-xPO4 (wherein A is at least one element selected from Na and K, and x is from 0 to 3) and A′yH(6-2y)(PO4)2 (wherein A′ is at least one element selected from Mg and Ca, and y is from 0 to 3).

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority to Japanese Patent Application No. 2012-040475 filed on February 27, 2012, the entire contents of which are incorporated herein by reference. technical field [0003] The present embodiment relates to a nonaqueous electrolyte battery and a battery pack. Background technique [0004] Research is being conducted on a non-aqueous electrolyte battery that charges / discharges based on the movement of lithium ions between the negative electrode and the positive electrode, and a battery with high energy density is being developed. Nonaqueous electrolyte batteries including lithium transition metal composite oxides and carbonaceous materials as active materials have been commercially used. In lithium transition metal composite oxides, Co, Mn, Ni, etc. are used as transition metals. [0005] Recently, lithium-titanium composite oxides including, for example, lithium-titanium com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M4/62
CPCH01M4/485H01M10/0525H01M10/056Y02E60/10Y02T10/70
Inventor 稻垣浩贵高见则雄
Owner KK TOSHIBA