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Synthesis of a solid-state lithium battery and a preparation method of a graphite composite negative electrode sheet and a lithium iron phosphate composite positive electrode sheet

A synthesis method, lithium iron phosphate technology, applied in the direction of battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve problems such as short circuit, difficulty in battery assembly and application, and metal Li can not withstand high temperature, so as to improve energy density and lighten the Effect of battery weight and dead space reduction

Active Publication Date: 2020-12-08
QINGTAO KUNSHAN ENERGY DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All-solid-state lithium-ion batteries provide a possibility for the use of metal lithium in the negative electrode. However, lithium dendrites will be generated during the cycle of metal Li, which will not only reduce the amount of lithium available for intercalation / extraction, but more seriously cause At the same time, metal Li is very active and easily reacts with oxygen and moisture in the air, and metal Li cannot withstand high temperatures, which brings difficulties to the assembly and application of batteries. Therefore, at this stage, it is necessary to use metal lithium as the negative electrode. Large-scale batch production still has great challenges

Method used

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  • Synthesis of a solid-state lithium battery and a preparation method of a graphite composite negative electrode sheet and a lithium iron phosphate composite positive electrode sheet
  • Synthesis of a solid-state lithium battery and a preparation method of a graphite composite negative electrode sheet and a lithium iron phosphate composite positive electrode sheet
  • Synthesis of a solid-state lithium battery and a preparation method of a graphite composite negative electrode sheet and a lithium iron phosphate composite positive electrode sheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A solid-state lithium battery synthesis, solid-state lithium battery synthesis steps: Step 1: Laminate and assemble the above-mentioned lithium iron phosphate composite positive electrode sheet, polyoxyethylene-based lithium ion conductor solid electrolyte, and graphite composite negative electrode sheet to obtain a solid-state lithium battery ;

[0028] Step 2: The obtained solid-state lithium battery is charged and discharged at 60°C, 0.3C, and the charge-discharge cut-off voltage is 2.8V-3.7V. The result shows that the first discharge specific capacity is 144mAh / g, and after 400 cycles , The capacity retention rate is 93%.

[0029] A method for preparing a graphite composite negative electrode sheet, the preparation steps of the graphite composite negative electrode sheet are as follows: Step 1: blending graphite materials and conductive agents in a blender according to a mass ratio of 73:3;

[0030] Step 2: Mix the blended mixed powder and binder uniformly accordin...

Embodiment 2

[0045] A kind of synthesis of solid-state lithium battery, solid-state lithium battery synthesis steps: Step 1: Lamination and assembly of the above-mentioned lithium iron phosphate composite positive electrode sheet, polyoxyethylene-based lithium ion conductor solid electrolyte, and graphite composite negative electrode sheet to obtain solid lithium Battery;

[0046] Step 2: The obtained solid-state lithium battery is charged and discharged at 60°C, 0.3C, and the charge-discharge cut-off voltage is 2.8V-3.7V. The result shows that the first discharge specific capacity is 140mAh / g, and after 400 cycles , The capacity retention rate was 91%.

[0047] A method for preparing a graphite composite negative electrode sheet, the preparation steps of the graphite composite negative electrode sheet are as follows: Step 1: blending graphite materials and conductive agents in a blender according to a mass ratio of 78:3;

[0048] Step 2: Mix the blended mixed powder and binder according ...

Embodiment 3

[0063] A kind of synthesis of solid-state lithium battery, solid-state lithium battery synthesis steps: Step 1: Lamination and assembly of the above-mentioned lithium iron phosphate composite positive electrode sheet, polyoxyethylene-based lithium ion conductor solid electrolyte, and graphite composite negative electrode sheet to obtain solid lithium Battery;

[0064] Step 2: The obtained solid-state lithium battery is charged and discharged at 60°C, 0.3C, and the charge-discharge cut-off voltage is 2.8V-3.7V. The result shows that the first discharge specific capacity is 135mAh / g, and after 400 cycles , The capacity retention rate was 89%.

[0065] A method for preparing a graphite composite negative electrode sheet, the preparation steps of the graphite composite negative electrode sheet are as follows: Step 1: blending graphite materials and conductive agents in a blender according to a mass ratio of 83:3;

[0066] Step 2: Mix the blended mixed powder and binder uniformly ...

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Abstract

The invention discloses a synthesis of a solid-state lithium battery, which is characterized in that: the synthesis steps of the solid-state lithium-ion battery: Step 1: combining a lithium iron phosphate composite positive electrode sheet with a polyoxyethylene-based lithium ion conductor solid electrolyte, and a graphite composite negative electrode sheet Perform lamination and assembly to obtain a solid-state lithium-ion battery; Step 2: Charge and discharge the obtained solid-state lithium-ion battery at 60°C, 0.3C, and charge-discharge cut-off voltage 4.2V‑3.0V, and the results show that the first time The specific discharge capacity is 130‑144mAh / g, and the capacity retention rate is 86‑75% after 20 cycles. The advantage is that the structure of a solid-state lithium-ion battery includes a positive electrode, an electrolyte, and a negative electrode, all of which are composed of solid materials. The solid electrolyte can greatly simplify the battery construction process while conducting lithium ions.

Description

technical field [0001] The invention relates to the field of new energy lithium batteries, in particular to the synthesis of a solid lithium battery, a method for preparing a graphite composite negative electrode sheet, and a method for preparing a lithium iron phosphate composite positive electrode sheet. Background technique [0002] At present, commercial lithium-ion batteries generally use organic liquid electrolytes and gel electrolytes, which inevitably introduce volatile, flammable, and explosive organic liquids into the battery system, which brings serious safety hazards to the battery system. Compared with gel-state electrolytes, solid-state electrolytes have higher safety, thermal stability, and electrochemical stability. Therefore, replacing the electrolyte with a solid electrolyte and developing an all-solid-state lithium-ion battery is the only way to fundamentally solve the safety problem. All-solid-state lithium-ion batteries provide a possibility for the use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/36H01M4/58H01M4/587H01M10/0525H01M10/0565H01M10/058H01M10/44
CPCH01M4/139H01M4/364H01M4/5825H01M4/587H01M10/0525H01M10/0565H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 冯玉川李峥何泓材李培养杨帆南策文
Owner QINGTAO KUNSHAN ENERGY DEV CO LTD