作者：邵之杰¹, 蒋文伟¹, 王君瑞¹, 许红红¹, 刘明², 杨琴², 罗芩²

作者单位：1. 四川大学化学工程学院, 四川 成都 610065;
2. 四川宝利丰科技有限公司, 四川 什邡 618400

关键词：甲醇;锂盐回收;N-甲基吡硌烷酮;溶剂热;磷酸铁锂

摘要：

在聚苯硫醚的生产中，采用甲醇调浆、洗涤，改变洗涤工艺。通过甲醇的洗涤工艺使得锂离子的分离回收效率达到88%，同时实现锂盐与反应副产物钠盐的分离，为后续电池正极材料的合成创造条件，并且该洗涤工艺没有降低聚苯硫醚产品的性能。利用甲醇洗涤工艺中得到的含锂N-甲基吡硌烷酮（NMP）溶液，再通过溶剂热合成磷酸铁锂，并对其进行碳包覆处理。通过XRD、SEM、电化学检测等表征，所得磷酸铁锂材料粒径小、颗粒均匀、结晶性好，表现出良好的电化学性能，碳包覆处理后得到的LiFePO4/C在0.1C倍率首次放电比容量在152 mAh/g左右，在1C倍率首次放电比容量仍有137 mAh/g左右。

LiFePO₄ synthesized with PPS lithium-containing filtrate

SHAO Zhijie¹, JIANG Wenwei¹, WANG Junrui¹, XU Honghong¹, LIU Ming², YANG Qin², LUO Qin²

1. College of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. Sichuan Baolifeng Science and Technology Co., Ltd., Shifang 618400, China

Abstract: In polyphenylene sulfide production, methyl alcohol size mixing, rinsing and rinsing alteration processes are applied. By taking advantage of methyl alcohol rinsing process, the separation and recovery rate of lithium ion can reach 88% while the performance of PPS is maintained without degradation by means of such rinsing process after realization of separation of lithium salt from reaction by-product-sodium salt, providing conditions for subsequent synthesis of battery anode materials. By making use of the NMP solution containing lithium extracted through methyl alcohol rinsing process, LiFePO₄ is obtained through solvothermal synthesis and treated with carbon coating. Based on the representations manifested through XRD, SEM and electrochemical detection, the particle of LiFePO₄ material obtained shows small size and uniform shape and good crystallinity, acting out a good electrochemical performance. The initial specific discharge capacity of carbon-coating treated LiFePO₄/C at multiplying power of 0.1 C is about 152 mAh/g and still shows 137 mAh/g at multiplying power of 1 C.

Keywords: methanol;recovery of lithium salt;NMP;solvothermal;LiFePO₄

2017, 43(1): 42-45  收稿日期: 2016-03-15;收到修改稿日期: 2016-05-11

基金项目: 

作者简介: 邵之杰(1990-),男,安徽绩溪县人,硕士,主要从事精细有机合成。

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