add_new_column_to_custom_taxonomy_list.php

<?php
// add new column(s) to custom taxonomy list
add_filter('manage_edit-taconomyName_columns','manage_taconomyName_columns');
function manage_taconomyName_columns($columns){
	foreach( $columns as $k=>$v )
		$ke = $k;
	array_pop( $columns );
	return array_merge( $columns, 
			array( 'f_image'=>__('Image') ),
			array( $ke=>$v )
	);
}
add_filter ('manage_taconomyName_custom_column', 'manage_taconomyName_custom_fields', 10,3);
function manage_taconomyName_custom_fields($deprecated, $column_name, $term_id){
	$prefix = 'cmb2_';
	if ($column_name == 'f_image') {
		$f_image = get_term_meta( $term_id, $prefix.'f_image', true );
		echo '<img src="'.$f_image.'" alt="" height="50" />';
	}
}