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All-solid-state lithium ion battery

A lithium-ion battery, all-solid technology, applied in the direction of lithium batteries, solid electrolytes, battery electrodes, etc., can solve the problems of low current, high interface resistance, side reactions of graphite negative electrodes, etc., and achieve low resistance, increased contact area, and long life. The effect of cycle life

Inactive Publication Date: 2019-03-01
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the electrolyte, the ionic conductivity of the polymer solid electrolyte at room temperature is less than 1 / 100, and the current taken out at room temperature or low temperature is small, and it is easy to have side reactions with the graphite negative electrode in the charged state, and the interface The problem of high resistance

Method used

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  • All-solid-state lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] [Solid Electrolyte Layer]

[0096] Weigh the Li of the starting material at a molar ratio of 75:25 under an argon atmosphere 2 S (manufactured by Nippon Chemical Co., Ltd.) and P 2 S 5 (manufactured by Sigma-Aldrich Japan United Co., Ltd.) and mixed, using a planetary ball mill (P-5 type, manufactured by FRITSCH Japan (stock)) and zirconia balls (7 pieces of 10mmφ, 10 pieces of 3mmφ), by performing 20 hours of mechanical grinding (speed 400rpm), to obtain a D50 of 8μm Li 3 P.S. 4 Amorphous solid electrolyte.

[0097] Using a mold made of polyethylene with an inner diameter of 10 mmφ and a punch made of SUS, press molding was performed with a uniaxial press molding machine to obtain a solid electrolyte layer used in a battery evaluation test.

[0098] [negative electrode]

[0099] Petroleum-based coke was pulverized using a bantammill (manufactured by HOSOKAWA MICRON Co., Ltd.), and classified by airflow using a precision classifier (TurboClassifier) ​​(manufacture...

Embodiment 2

[0115]Petroleum-based coke was pulverized using a pulverizer (manufactured by HOSOKAWA MICRON Co., Ltd.), and a fine classifier (manufactured by Nissin Engineering Co., Ltd.) was used to classify by air flow to obtain raw material powder with a D50 of 3 μm. Except for this, it was treated in the same manner as in Example 1 to obtain graphite particles C having physical property values ​​(BET specific surface area, D50 of raw material powder, orientation index, Raman value, and d0002) described in Table 1.

[0116] Except for using graphite particles C as the negative electrode active material, a solid electrolyte layer, a negative electrode, and a positive electrode were produced under the same conditions as in Example 1, and a test battery was produced and tested. Table 1 shows the evaluation results of battery characteristics.

Embodiment 3

[0118] Petroleum coke was pulverized using a pulverizer (manufactured by HOSOKAWA MICRON Co., Ltd.), and a raw material powder having a D50 of 7 μm was obtained by airflow classification using a precision classifier (manufactured by Nissin Engineering Co., Ltd.). Except for this, it processed similarly to Example 1, and obtained the graphite particle D which has the physical-property value described in Table 1.

[0119] Except for using graphite particles D as the negative electrode active material, a solid electrolyte layer, a negative electrode, and a positive electrode were produced under the same conditions as in Example 1, and a test battery was produced and tested. Table 1 shows the evaluation results of battery characteristics.

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Abstract

The present invention relates to an all-solid-state lithium ion battery which comprises a solid electrolyte, a negative electrode and a positive electrode, and wherein: the solid electrolyte is composed of at least one substance selected from among oxide-based solid electrolytes and sulfide-based solid electrolytes; the 50% diameter (D50) in a volume-based cumulative particle diameter distributionis 0.1-10 [um]m; the negative electrode contains the solid electrolyte, a negative electrode active material and a conductive assistant; the negative electrode active material contains graphite particles that have a graphite crystal interplanar spacing d002 of 0.3360-0.3370 nm and a D50 of 1-10 [um]m; and the negative electrode contains 35-45 parts by mass of the negative electrode active material, 45-55 parts by mass of the solid electrolyte and 5-10 parts by mass of the conductive assistant. The present invention enables the achievement of an all-solid-state lithium ion battery which is increased in the contact area between a solid electrolyte and a negative electrode active material, while enabling improved intercalation / deintercalation reactions of lithium ions, and which therefore has high safety, low resistance and a long cycle life.

Description

technical field [0001] The invention relates to a liquid-free all-solid lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used because of their high voltage and high energy density. As a strategy to improve the safety of lithium-ion batteries, research on all-solid-state lithium-ion batteries using nonflammable and leak-free solid electrolytes instead of organic electrolytes has become active. [0003] For example, an all-solid lithium ion battery using a polymer solid electrolyte such as polyethylene oxide lithium salt compound has been studied a lot in the past. However, compared with the electrolyte, the ionic conductivity of the polymer solid electrolyte at room temperature is less than 1 / 100, and the current taken out at room temperature or low temperature is small, and it is easy to have side reactions with the graphite negative electrode in the charged state, and the interface The problem of high resistance. [0004] In addition, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M4/133H01M4/1393H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/133H01M4/1393H01M4/587H01M10/0525H01M10/0562H01M10/052H01M2300/0068H01M2300/0071H01M4/625H01M2004/027H01M2004/021Y02E60/10H01M4/366H01M4/62H01M4/131
Inventor 外轮千明武内正隆
Owner RESONAC HOLDINGS CORPORATION