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Positive electrode material for lithium secondary battery, and method for producing said positive electrode material

A lithium secondary battery and cathode material technology, applied in secondary batteries, battery electrodes, batteries, etc., can solve the problem of low electronic conductivity and achieve the effect of inhibiting structural deterioration

Inactive Publication Date: 2014-01-01
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiFePO 4 Compared with previous LiCoO 2 Equal ratio, low electron conductivity, so the compounding with conductive additives has been studied

Method used

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  • Positive electrode material for lithium secondary battery, and method for producing said positive electrode material
  • Positive electrode material for lithium secondary battery, and method for producing said positive electrode material
  • Positive electrode material for lithium secondary battery, and method for producing said positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0131] "1. Synthesis process"

[0132] Dissolve 123g of LiOH·H 2 After O, 3.1 g of carbon fiber (Showa Denko Co., Ltd. VGCF-H (VGCF is a registered trademark. The same applies hereinafter)) was added and stirred. The carbon fibers had an average fiber length of 15 μm, a fiber diameter of 150 nm, and an aspect ratio of 100. Furthermore, stirring was carried out slowly adding 113 g of phosphoric acid of concentration 85%. In this way, the first raw material liquid was prepared.

[0133] Next, in a glove box, after dissolving 1.82 g of ascorbic acid in 700 mL of water, 272 g of FeSO 4 ·7H 2 O, the second raw material liquid was prepared.

[0134] Next, the first and second raw material liquids were mixed and stirred in a glove box, and then placed in an autoclave and sealed. Then, after the autoclave was heated up from room temperature to 120° C. over 1 hour, it was kept at 120° C. for 3 hours, and after being heated up to 200° C. over 1 hour, it was kept at 200° C. for 3 h...

Embodiment 2）

[0147] Instead of the carbon fiber of Example 1, a carbon fiber (VGCF-H manufactured by Showa Denko Co., Ltd.) was produced using Fe as a catalyst with a residual rate of Fe of 0.1%, and the first raw material liquid was prepared using it, except that it was the same as that of Example 1. The positive electrode material of Example 2 and the coin-type battery of Example 2 were successfully produced. The content of carbon fibers in the positive electrode material of Example 2 was 2% by mass, the content of coated carbon was 2% by mass, LiFePO 4 The particle content was 96% by mass.

[0148] And under the same conditions as in Example 1, a charge-discharge cycle test was carried out. As a result, the discharge capacity for the 2nd time was 151mAh / g, and the discharge capacity for the 500th time was 140mAh / g. The discharge capacity maintenance rate was 92.7%.

[0149] In addition, a temperature cycle test was carried out under the same conditions as in Example 1. As a result, th...

Embodiment 3）

[0151] Dissolve 113g of Li in 700mL of water in a glove box with a nitrogen atmosphere controlled to an oxygen concentration of 0.5% or less 3 PO 4 After that, 3.1 g of the same carbon fiber (VGCF-H manufactured by Showa Denko Co., Ltd.) as in Example 1 was added and stirred to prepare a first raw material solution, and the positive electrode of Example 3 was produced in the same manner as in Example 1. Materials and the coin-type battery of Example 3. The carbon fiber content in the positive electrode material of Example 3 was 2% by mass, LiFePO 4 The particle content was 96% by mass.

[0152] And under the same conditions as in Example 1, the charge-discharge cycle test was carried out. As a result, the discharge capacity for the 2nd time was 153mAh / g, and the discharge capacity for the 500th time was 141mAh / g. The discharge capacity maintenance rate was 92.2%.

[0153] In addition, a temperature cycle test was carried out under the same conditions as in Example 1. As a ...

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Abstract

Provided are a method for producing a positive electrode material for a lithium secondary battery, a positive electrode material for a lithium secondary battery, and a lithium secondary battery, wherein it is possible to prevent the occurrence of structural degradation even when active material particles repeatedly expand and contract as a consequence of charging and discharging electricity or even when the temperature of the exterior of the battery changes. The following positive electrode material for a lithium secondary battery is employed. A positive electrode material characterized in that positive electrode active material particles formed from olivine LiMPO4 (wherein M represents one or more elements selected from among Fe, Mn, Ni and Co) are bound to the surface of fibrous carbon.

Description

technical field [0001] The invention relates to a cathode material for a lithium secondary battery and a manufacturing method thereof. [0002] this application claims the priority based on the patent application 2011-102389 for which it applied to Japan on April 28, 2011, The content is used for this application. Background technique [0003] LiFePO which is a kind of olivine-type lithium metal phosphate 4 , compared with LiCoO, which is widely used as the positive electrode active material of lithium secondary batteries in the past 2 Since it is cheap, it is expected to be used as a positive electrode active material of a lithium secondary battery, especially a large lithium secondary battery such as an automobile, in the future. [0004] as LiFePO 4 There are known solid-phase synthesis methods, hydrothermal synthesis methods, and sol-gel methods, but among these methods, LiFePO with a small particle size can be obtained at a relatively low temperature and in a short t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45H01M4/36
CPCY02E60/12H01M4/5825C01B25/37H01M4/366H01M4/625C01B25/45H01M4/587H01M10/0525H01M2220/20Y02E60/10Y02P70/50
Inventor 河边功织地学利根川明央
Owner RESONAC HOLDINGS CORPORATION
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