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High power full-cells of LiNi 0.5 Mn 1.5 O 4 -Li 4 Ti 5 O 12 are demonstrated by engaging a scalable cottontemplated synthetic process. The cotton-templated method produces hierarchical structures in which primary particles in the range of 100-300 nm form three-dimensional porous secondary structures for both electrodes. While the primary particles in the smaller scales facilitate efficient electronic/ionic diffusion for high rate performance, the three-dimensional porous secondary structures remain stable during cycling for excellent cycle life. The synthetic method introduced herein is simple and universal, and should thus be applicable to other battery materials requiring high power performance.

We report a simple and scalable synthetic method where we use cotton as a template material to grow LiCoO2 nanoparticles along one dimensional micro-fibers with minimized agglomeration. The final three dimensional porous electrode structure and smaller dimensions of nanoparticles result in efficient ionic accessibility as well as decreased ionic/electronic diffusion lengths during battery cycling. Due to this structural advantage, the nanoparticle fiber structure exhibits substantially improved power performance compared to that of the commercial micron-size counterpart. Even at a fast 2 min discharging rate, a capacity of 90 mAh/g is preserved. Excellent cycling performance is also achieved by maintaining the original electrode structure. The synthetic procedures introduced herein are simple and scalable and thus must be readily applicable to the large-scale syntheses of other lithium battery active materials.

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