Nonaqueous electrolyte battery, battery module, and battery pack
A non-aqueous electrolyte and battery technology, used in battery electrodes, battery pack components, batteries, etc., can solve the problems of degraded output properties, low temperature performance and long life performance, difficulty in replacing lead storage batteries, and increased electrode interface resistance.
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no. 1 approach
[0021] In a negative electrode including titanium-containing oxide particles having an average secondary particle diameter of less than 5 μm, reductive decomposition of the nonaqueous electrolyte proceeds at high temperature (for example, 70° C. or higher). Therefore, the negative electrode has secondary cycle life performance at high temperature. If the average particle diameter of the secondary particles containing titanium oxide particles is increased to more than 5 μm, thereby suppressing reductive decomposition of the nonaqueous electrolyte at high temperature, when increasing the pressing force during the manufacture of the negative electrode to increase the negative electrode density (or negative electrode filling Density) when the secondary particles are easy to break. If the secondary particles are broken, many conductive paths between the primary particles in the secondary particles are broken, so that the electronic resistance of the negative electrode increases. I...
no. 2 approach
[0090] A second embodiment provides a battery module including a nonaqueous electrolyte battery as a unit cell, and a battery pack including the battery module. The nonaqueous electrolyte battery may be the nonaqueous electrolyte battery of the first embodiment.
[0091] Examples of the battery module include those including a plurality of unit cells electrically connected in series or in parallel, and those including a unit including a plurality of unit cells electrically connected in series and another unit including a plurality of unit cells electrically connected in parallel battery module.
[0092] Examples of the form of series or parallel electrical connection of a plurality of nonaqueous electrolyte batteries include series or parallel electrical connection of a plurality of batteries each having a container, and series or parallel electrical connection of a plurality of electrode groups accommodated in a common cell. According to a specific example of the former, pos...
Embodiment 1
[0106]
[0107] The average secondary particle diameter of the negative electrode active material is 8 μm and the Li absorption potential is 1.55 V (relative to Li / Li + ) Lithium titanate (Li 4 / 3 Ti 5 / 3 o 4 ) powder, carbon powder with an average particle size of 0.4 μm as a conductive agent, and polyvinylidene fluoride (PVdF) as a binder are mixed in a weight ratio of 90:7:3, and the mixture is dispersed in n-methyl Pyrrolidone (NMP) solvent to prepare slurry.
[0108] The secondary particle and primary particle sizes of the active material are measured using a laser diffraction particle size distribution analyzer (manufactured by Shimadzu Co., Ltd., model SALD-300) and an electron microscope. First, about 0.1 g of a sample is placed in, for example, a beaker, a surfactant and 1 to 2 mL of distilled water are added and stirred well, and poured into a stirring water bath. Using a laser diffraction particle size distribution analyzer, the light intensity distribution was ...
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