Carboxymethylated nanocellulose-based gel polymer electrolyte with a high lithium ion transfer number for flexible lithium-ion batteries application,Chemical Engineering Journal

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Carboxymethylated nanocellulose-based gel polymer electrolyte with a high lithium ion transfer number for flexible lithium-ion batteries application
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2021-09-22 , DOI: 10.1016/j.cej.2021.132604
Jianlin Wang _{1,

2} , Chunyu Wang _{1,

2} , Wei Wang _{1,

2} , Wei Li _{1,

2} , Jincheng Lou _{1,

2}

Affiliation

Environmental-friendly nanocellulose films with excellent mechanical strength have attracted extensive attention in the gel polymer electrolytes (GPEs) for lithium-ion batteries. However, their dense structure causes poor electrolyte uptake capacity. In this research, carboxymethylated nanocellulose (CMNC) with a strong swelling behavior and anionic character was chosen as raw materials to not only improve the electrolyte absorption ability and lithium ion transfer number of the resulting GPEs but also avoid short circuits by their dense morphology. Further crosslinking by epichlorohydrin and solvent casting, CCMNC films were obtained, which exhibited excellent mechanical strength (36.46 to 67.45 MPa), thermal stability (up to 250 °C) and flexibility. After electrolyte uptaking, the optimal GCCMNC GPE at an ECH content of 5 wt% displayed an electrolyte uptake ratio, ionic conductivity, lithium ion transfer number, and electrochemical stability window of 312 wt%, 3.93 mS cm, 0.82, and 4.65 V, respectively. Particularly, the initial discharge capacity of our assembled Li/GCCMNC-5/NCM523 battery was 151.4 mAh g. After 50 cycling, the cell still maintained a capacity of 74 % and a coulombic efficiency of 98 %. The good mechanical strength, thermal stability and electrochemical properties of our designed GCCMNC GPE indicated its promising application in the lithium-ion batteries.

中文翻译：

用于柔性锂离子电池应用的具有高锂离子传输数的羧甲基化纳米纤维素基凝胶聚合物电解质

具有优异机械强度的环保纳米纤维素薄膜在锂离子电池凝胶聚合物电解质（GPE）中引起了广泛关注。然而，它们的致密结构导致电解质吸收能力较差。本研究选择具有强溶胀行为和阴离子特性的羧甲基化纳米纤维素（CMNC）作为原材料，不仅提高了所得GPE的电解液吸收能力和锂离子传输数量，而且通过其致密的形态避免了短路。通过环氧氯丙烷进一步交联和溶剂浇铸，获得了CCMNC薄膜，该薄膜表现出优异的机械强度（36.46至67.45 MPa）、热稳定性（高达250℃）和柔韧性。吸收电解质后，ECH含量为5 wt%的最佳GCCMNC GPE的电解质吸收率、离子电导率、锂离子转移数和电化学稳定性窗口分别为312 wt%、3.93 mS cm、0.82和4.65 V 。特别是，我们组装的Li/GCCMNC-5/NCM523电池的初始放电容量为151.4 mAh g。 50次循环后，电池仍保持74%的容量和98%的库伦效率。我们设计的GCCMNC GPE良好的机械强度、热稳定性和电化学性能表明其在锂离子电池中的应用前景。

更新日期：2021-09-22

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