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Active material for cell, nonaqueous electrolyte cell and cell pack

A non-aqueous electrolyte and active material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low Li ion diffusivity and less mobile Li ions, and achieve the effect of high capacity and excellent high current characteristics

Active Publication Date: 2012-04-11
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, TiO 2 The practical electrode capacity of (B) is about 170 to 200 mAh / g as disclosed in Patent Document 1 or Patent Document 2, which is significantly lower than the theoretical capacity
think this is because: Although TiO 2 There are many sites that can become Li hosts in the crystal structure of (B), but due to the low diffusion of Li ions in the solid, there are fewer effective mobile Li ions

Method used

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  • Active material for cell, nonaqueous electrolyte cell and cell pack
  • Active material for cell, nonaqueous electrolyte cell and cell pack
  • Active material for cell, nonaqueous electrolyte cell and cell pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138]

[0139] First, N-methylpyrrolidone (NMP) was added with lithium nickel composite oxide (LiNi 0.82 Co 0.15 Al 0.03 O 2 ) powder 90 wt %, 5 wt % of acetylene black as a conductive agent, and 5 wt % of polyvinylidene fluoride (PVdF), these were mixed to prepare a slurry, and the slurry was applied to an aluminum foil with a thickness of 15 μm. Both sides of the current collector are then dried and pressurized, thereby making a positive electrode layer with a density of 3.15g / cm 3 the positive pole.

[0140]

[0141] First, potassium carbonate (K 2 CO 3 ) and anatase titanium oxide (TiO 2 ) were mixed and fired at 1000°C for 24 hours to synthesize K 2 Ti 4 O 9 . The K obtained by using zirconia microbeads 2 Ti 4 O 9 Dry pulverization was performed for about 3 hours to adjust the particle size, followed by washing with pure water to prepare a proton exchange precursor. The obtained proton exchange precursor was put into a hydrochloric acid solution having ...

Embodiment 2～5

[0152] A titanium composite oxide was synthesized by setting the pulverization time, proton exchange time, temperature and time of the first heat treatment, temperature increase rate, and temperature and time of the second heat treatment, and temperature increase rate to the conditions described in Table 1 below, respectively, A non-aqueous electrolyte secondary battery was assembled in the same manner as in Example 1, except that the obtained titanium composite oxide was used as the active material of the negative electrode.

[0153] In addition, in Examples 3 to 5, 3% by weight of sucrose was dissolved in a pure water / ethanol mixed solution to prepare a solution, the substance obtained by the first heat treatment was put into the solution, and the solvent was volatilized while stirring to prepare a solution. The carbon-forming precursor coating material is subjected to the second heat treatment.

Embodiment 6～12

[0162] The grinding time, the proton exchange time, and the time, temperature, and heating rate of the heat treatment (first heat treatment) were respectively set to the conditions described in the following Table 3 to synthesize a titanium composite oxide, and the obtained titanium composite oxide was used as A non-aqueous electrolyte secondary battery was assembled in the same manner as in Example 1 except for the active material of the negative electrode.

[0163] In addition, the crystallite grain sizes in the four crystal plane orientations of the titanium composite oxides obtained in Examples 2, 12 and Comparative Example 1 are shown in Image 6 middle.

[0164] The 0.2C discharge capacity and the 2C discharge capacity were measured for each of the batteries of Examples 6 to 12 in an environment of 25°C, and the ratio (%) of the 2C discharge capacity to the 0.2C discharge capacity was obtained as the capacity retention ratio (%). The results are shown in Table 4 below. ...

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Abstract

A nonaqueous electrolyte cell is provided with an exterior material, a positive electrode housed in the exterior material, a negative electrode housed in the exterior material spatially apart from the positive electrode and containing an active material containing a monoclinic beta titanium composite oxide, and a nonaqueous electrolyte filled in the exterior material. Regarding the crystallite diameter of the monoclinic beta titanium composite oxide, which is calculated by a wide-angle X-ray diffraction method using a CuKa line as an X-ray source, when the crystallite diameter calculated from a peak at which 2? is in the range of 48-49 DEG is taken as X and the crystallite diameter calculated from a peak at which 2? is in the range of 24-26 DEG is taken as Y, X is larger than Y.

Description

technical field [0001] The present invention relates to an active material for a battery, a nonaqueous electrolyte battery and a battery pack. Background technique [0002] In recent years, titanium oxides with a monoclinic β-type structure (denoted as TiO 2 (B)) attracts attention as an active material for nonaqueous electrolyte batteries (see Patent Documents 1 to 3). In the past, practical spinel lithium titanate (Li 4 Ti 5 o 2 ) The number of lithium ions that can be intercalated / deintercalated per unit chemical formula is 3. Therefore, the number of lithium ions that can be intercalated / deintercalated per titanium ion is 3 / 5, and 0.6 is the theoretical maximum. In contrast, TiO 2 The number of lithium ions that can be intercalated / deintercalated per titanium ion in (B) is at most 1.0. Therefore, it has the characteristic that the theoretical capacity is as high as about 335mAh / g. [0003] However, TiO 2 The practical electrode capacity of (B) is about 170 to 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCC01P2006/12Y02E60/122C01P2002/72C01P2002/77C01P2006/40C01G23/005H01M4/485C01P2002/54C01G23/047Y02E60/10
Inventor 稻垣浩贵原田康宏保科圭吾高见则雄
Owner KK TOSHIBA
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