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Non-aqueous electrolyte secondary battery and method for producing the same

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, electrolyte battery manufacturing, and non-aqueous electrolyte battery electrodes. Improved storage properties and higher capacity

Active Publication Date: 2011-09-21
PANASONIC ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the end-of-charge voltage is increased, there is a problem that the positive electrode active material deteriorates with the increase, or the electrolyte solution is oxidatively decomposed, so there is a problem that battery characteristics decrease.

Method used

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  • Non-aqueous electrolyte secondary battery and method for producing the same

Examples

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Embodiment 1

[0052] In Example 1, a battery was produced in the same manner as described above for implementing the invention.

[0053] The battery produced in this way is hereinafter referred to as battery A1 of the present invention.

Embodiment 2

[0055] When a phosphoric acid compound is precipitated on the surface of lithium cobaltate, samarium nitrate hexahydrate is used instead of neodymium nitrate hexahydrate, and samarium phosphate is uniformly dispersed and adhered on the surface of lithium cobaltate to obtain a positive electrode active material. In addition to using the positive electrode active material, A battery was produced in the same manner as in Example 1 above. In addition, the ratio of samarium phosphate to lithium cobaltate was 0.062% by mass in terms of samarium element, which was the same amount as the neodymium phosphate in Example 1 in terms of moles.

[0056] The battery produced in this way is hereinafter referred to as battery A2 of the present invention.

Embodiment 3

[0058] When a phosphoric acid compound is precipitated on the surface of lithium cobaltate, europium nitrate hexahydrate is used instead of neodymium nitrate hexahydrate, and europium phosphate is uniformly dispersed and adhered on the surface of lithium cobaltate to obtain a positive electrode active material. , and the same operation as in the above-mentioned Example 1 to produce a battery. In addition, the ratio of europium phosphate to lithium cobaltate was 0.063% by mass in terms of europium element, which was the same amount as the neodymium phosphate in Example 1 in terms of moles.

[0059] The battery produced in this way is hereinafter referred to as battery A3 of the present invention.

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Abstract

The present invention relates to a non-aqueous electrolyte secondary battery, whose storage characteristics at high temperature can be increased in the case where the charge cut-off voltage is increased to achieve high battery capacity and a method for producing the secondary battery. A positive electrode active material with least part of a surface coated with a surface treatment layer composed of a phosphate compound. The phosphate compound contains at least one element selected from the group consisting of neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

Description

technical field [0001] The present invention relates to an improvement of a nonaqueous electrolyte secondary battery and a method of manufacturing the same, and particularly relates to a nonaqueous electrolyte secondary battery capable of high reliability even in a battery structure characterized by high capacity and a method of manufacturing the same. Background technique [0002] In recent years, mobile information terminals such as mobile phones, notebook computers, and PDAs have been rapidly reduced in size and weight, and batteries used as driving power sources are also required to have higher capacities. As a secondary battery that meets this requirement, an alloy that can store / release lithium ions, or a nonaqueous electrolyte secondary battery that uses a carbon material or the like as a negative electrode active material and a lithium transition metal composite oxide as a positive electrode active material has a high The energy density of the battery has attracted a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/13H01M10/058H01M4/1397
CPCY02E60/12Y02E60/124Y02E60/122Y02T10/7011H01M10/058H01M10/052H01M4/62H01M4/366H01M4/1391H01M4/131Y02E60/10Y10T29/49108Y10T29/49115Y02P70/50Y02T10/70
Inventor 松本浩友纪小笠原毅井町直希
Owner PANASONIC ENERGY CO LTD
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