Edition electrolyte revised second solution

The resulting battery was subjected to aging with a weak current, and the electrolyte was well permeated into the positive electrode and the negative electrode.

The value obtained by dividing a discharge capacity at the n-th cycle by a discharge capacity at the first cycle was defined as the discharge capacity retention ratio at the n-th cycle Es n. Being high in discharge capacity retention ratio means being satisfactory in cycle characteristics.

Moreover, a charge capacity at the first cycle and a discharge capacity at the first cycle were defined as the charge capacity Ec of a secondary battery and the discharge capacity Ed of a secondary battery, respectively. A battery for evaluation using each of positive electrode active materials obtained in Examples 1 to 4 and Comparative Examples 1 to 5 was evaluated for output characteristics in the following way. A battery for evaluation which was the same as that for cycle characteristics evaluation was subjected to aging by allowing a weak current to flow, and the electrolyte was well permeated to the positive electrode and the negative electrode.

Then, discharging by a high current and charging by a weak current were repeated. Being low in the R T means being satisfactory in output characteristics.

The producing conditions for positive electrode active materials in Examples 1 to 4 and Comparative Examples 1 to 5 and various battery characteristics are shown in Table 1 and Table 2, respectively. Example 1 Li 1. The results in Tables 1 and 2 reveal the following. In the battery prepared with a positive electrode active material of Comparative Example 1 which is composed only of core particles, the cycle characteristics extremely deteriorate when the charging voltage is set to 4.

On the other hand, in the batteries respectively prepared with a positive electrode active material of Examples 1 to 3 and Comparative Examples 2 to 4 which is composed of core particles and a coating layer formed on the core particles, the cycle characteristics are improved. The improvement effect thereof is insufficient in Comparative Examples 2 to 4 where the heat treatment temperature is too high or the charged amount of fluorine is not appropriate.

On the other hand, in Examples 1 to 3, similar cycle characteristics to those in the case of employing the conventional charging voltage are exhibited.

Moreover, the formation of the coating layer does not adversely affect other characteristics. With regard to a non-aqueous electrolyte secondary battery using a positive electrode in which the positive electrode active material obtained by the method of the present invention is used, the cycle characteristics do not deteriorate even when the charging voltage is set to a high voltage of 4.

On that account, it is possible to realize satisfactory cycle characteristics at the time of charging at high voltages while taking advantage of high charge and discharge capacity and high output of a lithium-nickel-based composite oxide positive electrode active material. In particular, such a secondary battery can be suitably utilized as a power source for large-sized equipment requiring high energy density, high output and a long life such as an electric vehicle.

As described above, it should be obvious that various other embodiments are possible without departing the spirit and scope of the present invention. Accordingly, the scope and spirit of the present invention should be limited only by the following claims.

All publications, patent applications, and technical standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference.

What is claimed is: 1. A method of producing a positive electrode active material having a coating layer containing erbium fluoride for a non-aqueous electrolyte secondary battery, the method comprising: stirring core particles comprising a lithium-transition metal composite oxide represented by a formula: Li a Ni 1-x-y-z Co x M 1 y M 2 z O 2.

The method according to claim 1 , wherein 0. The method according to claim 1 , wherein 1. Method for producing positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery. Method of producing positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery.

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Positive electrode active material for non-aqueous electrolyte secondary battery, production method for same, positive electrode for non-aqueous electrolyte secondary battery using said positive electrode active material, and non-aqueous electrolyte secondary battery using said positive electrode. Positive electrode active material for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery using same. Cathode active material for nonaqueous electrolyte secondary battery, its manufacturing method, and nonaqueous electrolyte secondary battery.

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KRA en. Positive electrode active material, positive electrode for nonaqueous electrolyte battery, and nonaqueous electrolyte battery. KRB1 en. Cathod active material, method for preparing the same, lithium secondary battery comprising the same. Precursor for lithium transition metal oxide cathode materials for rechargeable batteries. JPWOA1 en. Manufacturing method of positive active material containing reduced residual lithium and positive active material manufactured by the same.

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Lithium transition-metal compound oxide for positive electrode active material for lithium secondary battery, and lithium secondary battery using the same. A method for producing a positive electrode composition for a non-aqueous electrolyte secondary battery, a non-aqueous electrolyte secondary battery, and a positive electrode composition for a non-aqueous electrolyte secondary battery.

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Skip to main content Thank you for visiting nature. Subjects Electrocatalysis Heterogeneous catalysis Photocatalysis. Abstract Propylene oxide is a crucial feedstock in the plastic industry. Access through your institution. Buy or subscribe. This is a preview of subscription content. Change institution. Buy article Get time limited or full article access on ReadCube. References 1. Article Google Scholar 5.

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